1VERSION = 3 2PATCHLEVEL = 6 3SUBLEVEL = 0 4EXTRAVERSION = 5NAME = Terrified Chipmunk 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# Do not: 14# o use make's built-in rules and variables 15# (this increases performance and avoids hard-to-debug behaviour); 16# o print "Entering directory ..."; 17MAKEFLAGS += -rR --no-print-directory 18 19# Avoid funny character set dependencies 20unexport LC_ALL 21LC_COLLATE=C 22LC_NUMERIC=C 23export LC_COLLATE LC_NUMERIC 24 25# We are using a recursive build, so we need to do a little thinking 26# to get the ordering right. 27# 28# Most importantly: sub-Makefiles should only ever modify files in 29# their own directory. If in some directory we have a dependency on 30# a file in another dir (which doesn't happen often, but it's often 31# unavoidable when linking the built-in.o targets which finally 32# turn into vmlinux), we will call a sub make in that other dir, and 33# after that we are sure that everything which is in that other dir 34# is now up to date. 35# 36# The only cases where we need to modify files which have global 37# effects are thus separated out and done before the recursive 38# descending is started. They are now explicitly listed as the 39# prepare rule. 40 41# To put more focus on warnings, be less verbose as default 42# Use 'make V=1' to see the full commands 43 44ifeq ("$(origin V)", "command line") 45 KBUILD_VERBOSE = $(V) 46endif 47ifndef KBUILD_VERBOSE 48 KBUILD_VERBOSE = 0 49endif 50 51# Call a source code checker (by default, "sparse") as part of the 52# C compilation. 53# 54# Use 'make C=1' to enable checking of only re-compiled files. 55# Use 'make C=2' to enable checking of *all* source files, regardless 56# of whether they are re-compiled or not. 57# 58# See the file "Documentation/sparse.txt" for more details, including 59# where to get the "sparse" utility. 60 61ifeq ("$(origin C)", "command line") 62 KBUILD_CHECKSRC = $(C) 63endif 64ifndef KBUILD_CHECKSRC 65 KBUILD_CHECKSRC = 0 66endif 67 68# Use make M=dir to specify directory of external module to build 69# Old syntax make ... SUBDIRS=$PWD is still supported 70# Setting the environment variable KBUILD_EXTMOD take precedence 71ifdef SUBDIRS 72 KBUILD_EXTMOD ?= $(SUBDIRS) 73endif 74 75ifeq ("$(origin M)", "command line") 76 KBUILD_EXTMOD := $(M) 77endif 78 79# kbuild supports saving output files in a separate directory. 80# To locate output files in a separate directory two syntaxes are supported. 81# In both cases the working directory must be the root of the kernel src. 82# 1) O= 83# Use "make O=dir/to/store/output/files/" 84# 85# 2) Set KBUILD_OUTPUT 86# Set the environment variable KBUILD_OUTPUT to point to the directory 87# where the output files shall be placed. 88# export KBUILD_OUTPUT=dir/to/store/output/files/ 89# make 90# 91# The O= assignment takes precedence over the KBUILD_OUTPUT environment 92# variable. 93 94 95# KBUILD_SRC is set on invocation of make in OBJ directory 96# KBUILD_SRC is not intended to be used by the regular user (for now) 97ifeq ($(KBUILD_SRC),) 98 99# OK, Make called in directory where kernel src resides 100# Do we want to locate output files in a separate directory? 101ifeq ("$(origin O)", "command line") 102 KBUILD_OUTPUT := $(O) 103endif 104 105ifeq ("$(origin W)", "command line") 106 export KBUILD_ENABLE_EXTRA_GCC_CHECKS := $(W) 107endif 108 109# That's our default target when none is given on the command line 110PHONY := _all 111_all: 112 113# Cancel implicit rules on top Makefile 114$(CURDIR)/Makefile Makefile: ; 115 116ifneq ($(KBUILD_OUTPUT),) 117# Invoke a second make in the output directory, passing relevant variables 118# check that the output directory actually exists 119saved-output := $(KBUILD_OUTPUT) 120KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd) 121$(if $(KBUILD_OUTPUT),, \ 122 $(error output directory "$(saved-output)" does not exist)) 123 124PHONY += $(MAKECMDGOALS) sub-make 125 126$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make 127 $(Q)@: 128 129sub-make: FORCE 130 $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \ 131 KBUILD_SRC=$(CURDIR) \ 132 KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \ 133 $(filter-out _all sub-make,$(MAKECMDGOALS)) 134 135# Leave processing to above invocation of make 136skip-makefile := 1 137endif # ifneq ($(KBUILD_OUTPUT),) 138endif # ifeq ($(KBUILD_SRC),) 139 140# We process the rest of the Makefile if this is the final invocation of make 141ifeq ($(skip-makefile),) 142 143# If building an external module we do not care about the all: rule 144# but instead _all depend on modules 145PHONY += all 146ifeq ($(KBUILD_EXTMOD),) 147_all: all 148else 149_all: modules 150endif 151 152srctree := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR)) 153objtree := $(CURDIR) 154src := $(srctree) 155obj := $(objtree) 156 157VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD)) 158 159export srctree objtree VPATH 160 161 162# SUBARCH tells the usermode build what the underlying arch is. That is set 163# first, and if a usermode build is happening, the "ARCH=um" on the command 164# line overrides the setting of ARCH below. If a native build is happening, 165# then ARCH is assigned, getting whatever value it gets normally, and 166# SUBARCH is subsequently ignored. 167 168SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \ 169 -e s/arm.*/arm/ -e s/sa110/arm/ \ 170 -e s/s390x/s390/ -e s/parisc64/parisc/ \ 171 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \ 172 -e s/sh[234].*/sh/ ) 173 174# Cross compiling and selecting different set of gcc/bin-utils 175# --------------------------------------------------------------------------- 176# 177# When performing cross compilation for other architectures ARCH shall be set 178# to the target architecture. (See arch/* for the possibilities). 179# ARCH can be set during invocation of make: 180# make ARCH=ia64 181# Another way is to have ARCH set in the environment. 182# The default ARCH is the host where make is executed. 183 184# CROSS_COMPILE specify the prefix used for all executables used 185# during compilation. Only gcc and related bin-utils executables 186# are prefixed with $(CROSS_COMPILE). 187# CROSS_COMPILE can be set on the command line 188# make CROSS_COMPILE=ia64-linux- 189# Alternatively CROSS_COMPILE can be set in the environment. 190# A third alternative is to store a setting in .config so that plain 191# "make" in the configured kernel build directory always uses that. 192# Default value for CROSS_COMPILE is not to prefix executables 193# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 194export KBUILD_BUILDHOST := $(SUBARCH) 195ARCH ?= $(SUBARCH) 196CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%) 197 198# Architecture as present in compile.h 199UTS_MACHINE := $(ARCH) 200SRCARCH := $(ARCH) 201 202# Additional ARCH settings for x86 203ifeq ($(ARCH),i386) 204 SRCARCH := x86 205endif 206ifeq ($(ARCH),x86_64) 207 SRCARCH := x86 208endif 209 210# Additional ARCH settings for sparc 211ifeq ($(ARCH),sparc32) 212 SRCARCH := sparc 213endif 214ifeq ($(ARCH),sparc64) 215 SRCARCH := sparc 216endif 217 218# Additional ARCH settings for sh 219ifeq ($(ARCH),sh64) 220 SRCARCH := sh 221endif 222 223# Additional ARCH settings for tile 224ifeq ($(ARCH),tilepro) 225 SRCARCH := tile 226endif 227ifeq ($(ARCH),tilegx) 228 SRCARCH := tile 229endif 230 231# Where to locate arch specific headers 232hdr-arch := $(SRCARCH) 233 234KCONFIG_CONFIG ?= .config 235export KCONFIG_CONFIG 236 237# SHELL used by kbuild 238CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \ 239 else if [ -x /bin/bash ]; then echo /bin/bash; \ 240 else echo sh; fi ; fi) 241 242HOSTCC = gcc 243HOSTCXX = g++ 244HOSTCFLAGS = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer 245HOSTCXXFLAGS = -O2 246 247# Decide whether to build built-in, modular, or both. 248# Normally, just do built-in. 249 250KBUILD_MODULES := 251KBUILD_BUILTIN := 1 252 253# If we have only "make modules", don't compile built-in objects. 254# When we're building modules with modversions, we need to consider 255# the built-in objects during the descend as well, in order to 256# make sure the checksums are up to date before we record them. 257 258ifeq ($(MAKECMDGOALS),modules) 259 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1) 260endif 261 262# If we have "make <whatever> modules", compile modules 263# in addition to whatever we do anyway. 264# Just "make" or "make all" shall build modules as well 265 266ifneq ($(filter all _all modules,$(MAKECMDGOALS)),) 267 KBUILD_MODULES := 1 268endif 269 270ifeq ($(MAKECMDGOALS),) 271 KBUILD_MODULES := 1 272endif 273 274export KBUILD_MODULES KBUILD_BUILTIN 275export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD 276 277# Beautify output 278# --------------------------------------------------------------------------- 279# 280# Normally, we echo the whole command before executing it. By making 281# that echo $($(quiet)$(cmd)), we now have the possibility to set 282# $(quiet) to choose other forms of output instead, e.g. 283# 284# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@ 285# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< 286# 287# If $(quiet) is empty, the whole command will be printed. 288# If it is set to "quiet_", only the short version will be printed. 289# If it is set to "silent_", nothing will be printed at all, since 290# the variable $(silent_cmd_cc_o_c) doesn't exist. 291# 292# A simple variant is to prefix commands with $(Q) - that's useful 293# for commands that shall be hidden in non-verbose mode. 294# 295# $(Q)ln $@ :< 296# 297# If KBUILD_VERBOSE equals 0 then the above command will be hidden. 298# If KBUILD_VERBOSE equals 1 then the above command is displayed. 299 300ifeq ($(KBUILD_VERBOSE),1) 301 quiet = 302 Q = 303else 304 quiet=quiet_ 305 Q = @ 306endif 307 308# If the user is running make -s (silent mode), suppress echoing of 309# commands 310 311ifneq ($(filter s% -s%,$(MAKEFLAGS)),) 312 quiet=silent_ 313endif 314 315export quiet Q KBUILD_VERBOSE 316 317 318# Look for make include files relative to root of kernel src 319MAKEFLAGS += --include-dir=$(srctree) 320 321# We need some generic definitions (do not try to remake the file). 322$(srctree)/scripts/Kbuild.include: ; 323include $(srctree)/scripts/Kbuild.include 324 325# Make variables (CC, etc...) 326 327AS = $(CROSS_COMPILE)as 328LD = $(CROSS_COMPILE)ld 329CC = $(CROSS_COMPILE)gcc 330CPP = $(CC) -E 331AR = $(CROSS_COMPILE)ar 332NM = $(CROSS_COMPILE)nm 333STRIP = $(CROSS_COMPILE)strip 334OBJCOPY = $(CROSS_COMPILE)objcopy 335OBJDUMP = $(CROSS_COMPILE)objdump 336AWK = awk 337GENKSYMS = scripts/genksyms/genksyms 338INSTALLKERNEL := installkernel 339DEPMOD = /sbin/depmod 340PERL = perl 341CHECK = sparse 342 343CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 344 -Wbitwise -Wno-return-void $(CF) 345CFLAGS_MODULE = 346AFLAGS_MODULE = 347LDFLAGS_MODULE = 348CFLAGS_KERNEL = 349AFLAGS_KERNEL = 350CFLAGS_GCOV = -fprofile-arcs -ftest-coverage 351 352 353# Use USERINCLUDE when you must reference the UAPI directories only. 354USERINCLUDE := \ 355 -I$(srctree)/arch/$(hdr-arch)/include/uapi \ 356 -Iarch/$(hdr-arch)/include/generated/uapi \ 357 -I$(srctree)/include/uapi \ 358 -Iinclude/generated/uapi \ 359 -include $(srctree)/include/linux/kconfig.h 360 361# Use LINUXINCLUDE when you must reference the include/ directory. 362# Needed to be compatible with the O= option 363LINUXINCLUDE := \ 364 -I$(srctree)/arch/$(hdr-arch)/include \ 365 -Iarch/$(hdr-arch)/include/generated \ 366 $(if $(KBUILD_SRC), -I$(srctree)/include) \ 367 -Iinclude \ 368 $(USERINCLUDE) 369 370KBUILD_CPPFLAGS := -D__KERNEL__ 371 372KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \ 373 -fno-strict-aliasing -fno-common \ 374 -Werror-implicit-function-declaration \ 375 -Wno-format-security \ 376 -fno-delete-null-pointer-checks 377KBUILD_AFLAGS_KERNEL := 378KBUILD_CFLAGS_KERNEL := 379KBUILD_AFLAGS := -D__ASSEMBLY__ 380KBUILD_AFLAGS_MODULE := -DMODULE 381KBUILD_CFLAGS_MODULE := -DMODULE 382KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds 383 384# Read KERNELRELEASE from include/config/kernel.release (if it exists) 385KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null) 386KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 387 388export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 389export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC 390export CPP AR NM STRIP OBJCOPY OBJDUMP 391export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE 392export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS 393 394export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS 395export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV 396export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 397export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 398export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 399export KBUILD_ARFLAGS 400 401# When compiling out-of-tree modules, put MODVERDIR in the module 402# tree rather than in the kernel tree. The kernel tree might 403# even be read-only. 404export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions 405 406# Files to ignore in find ... statements 407 408RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS \ 409 -o -name .pc -o -name .hg -o -name .git \) -prune -o 410export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 411 --exclude CVS --exclude .pc --exclude .hg --exclude .git 412 413# =========================================================================== 414# Rules shared between *config targets and build targets 415 416# Basic helpers built in scripts/ 417PHONY += scripts_basic 418scripts_basic: 419 $(Q)$(MAKE) $(build)=scripts/basic 420 $(Q)rm -f .tmp_quiet_recordmcount 421 422# To avoid any implicit rule to kick in, define an empty command. 423scripts/basic/%: scripts_basic ; 424 425PHONY += outputmakefile 426# outputmakefile generates a Makefile in the output directory, if using a 427# separate output directory. This allows convenient use of make in the 428# output directory. 429outputmakefile: 430ifneq ($(KBUILD_SRC),) 431 $(Q)ln -fsn $(srctree) source 432 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \ 433 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL) 434endif 435 436# Support for using generic headers in asm-generic 437PHONY += asm-generic 438asm-generic: 439 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \ 440 obj=arch/$(SRCARCH)/include/generated/asm 441 442# To make sure we do not include .config for any of the *config targets 443# catch them early, and hand them over to scripts/kconfig/Makefile 444# It is allowed to specify more targets when calling make, including 445# mixing *config targets and build targets. 446# For example 'make oldconfig all'. 447# Detect when mixed targets is specified, and make a second invocation 448# of make so .config is not included in this case either (for *config). 449 450no-dot-config-targets := clean mrproper distclean \ 451 cscope gtags TAGS tags help %docs check% coccicheck \ 452 include/linux/version.h headers_% archheaders archscripts \ 453 kernelversion %src-pkg 454 455config-targets := 0 456mixed-targets := 0 457dot-config := 1 458 459ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 460 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 461 dot-config := 0 462 endif 463endif 464 465ifeq ($(KBUILD_EXTMOD),) 466 ifneq ($(filter config %config,$(MAKECMDGOALS)),) 467 config-targets := 1 468 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),) 469 mixed-targets := 1 470 endif 471 endif 472endif 473 474ifeq ($(mixed-targets),1) 475# =========================================================================== 476# We're called with mixed targets (*config and build targets). 477# Handle them one by one. 478 479%:: FORCE 480 $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@ 481 482else 483ifeq ($(config-targets),1) 484# =========================================================================== 485# *config targets only - make sure prerequisites are updated, and descend 486# in scripts/kconfig to make the *config target 487 488# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 489# KBUILD_DEFCONFIG may point out an alternative default configuration 490# used for 'make defconfig' 491include $(srctree)/arch/$(SRCARCH)/Makefile 492export KBUILD_DEFCONFIG KBUILD_KCONFIG 493 494config: scripts_basic outputmakefile FORCE 495 $(Q)mkdir -p include/linux include/config 496 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 497 498%config: scripts_basic outputmakefile FORCE 499 $(Q)mkdir -p include/linux include/config 500 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 501 502else 503# =========================================================================== 504# Build targets only - this includes vmlinux, arch specific targets, clean 505# targets and others. In general all targets except *config targets. 506 507ifeq ($(KBUILD_EXTMOD),) 508# Additional helpers built in scripts/ 509# Carefully list dependencies so we do not try to build scripts twice 510# in parallel 511PHONY += scripts 512scripts: scripts_basic include/config/auto.conf include/config/tristate.conf 513 $(Q)$(MAKE) $(build)=$(@) 514 515# Objects we will link into vmlinux / subdirs we need to visit 516init-y := init/ 517drivers-y := drivers/ sound/ firmware/ 518net-y := net/ 519libs-y := lib/ 520core-y := usr/ 521endif # KBUILD_EXTMOD 522 523ifeq ($(dot-config),1) 524# Read in config 525-include include/config/auto.conf 526 527ifeq ($(KBUILD_EXTMOD),) 528# Read in dependencies to all Kconfig* files, make sure to run 529# oldconfig if changes are detected. 530-include include/config/auto.conf.cmd 531 532# To avoid any implicit rule to kick in, define an empty command 533$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ; 534 535# If .config is newer than include/config/auto.conf, someone tinkered 536# with it and forgot to run make oldconfig. 537# if auto.conf.cmd is missing then we are probably in a cleaned tree so 538# we execute the config step to be sure to catch updated Kconfig files 539include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd 540 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig 541else 542# external modules needs include/generated/autoconf.h and include/config/auto.conf 543# but do not care if they are up-to-date. Use auto.conf to trigger the test 544PHONY += include/config/auto.conf 545 546include/config/auto.conf: 547 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 548 echo >&2; \ 549 echo >&2 " ERROR: Kernel configuration is invalid."; \ 550 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 551 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 552 echo >&2 ; \ 553 /bin/false) 554 555endif # KBUILD_EXTMOD 556 557else 558# Dummy target needed, because used as prerequisite 559include/config/auto.conf: ; 560endif # $(dot-config) 561 562# The all: target is the default when no target is given on the 563# command line. 564# This allow a user to issue only 'make' to build a kernel including modules 565# Defaults to vmlinux, but the arch makefile usually adds further targets 566all: vmlinux 567 568ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 569KBUILD_CFLAGS += -Os 570else 571KBUILD_CFLAGS += -O2 572endif 573 574include $(srctree)/arch/$(SRCARCH)/Makefile 575 576ifdef CONFIG_READABLE_ASM 577# Disable optimizations that make assembler listings hard to read. 578# reorder blocks reorders the control in the function 579# ipa clone creates specialized cloned functions 580# partial inlining inlines only parts of functions 581KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \ 582 $(call cc-option,-fno-ipa-cp-clone,) \ 583 $(call cc-option,-fno-partial-inlining) 584endif 585 586ifneq ($(CONFIG_FRAME_WARN),0) 587KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN}) 588endif 589 590# Force gcc to behave correct even for buggy distributions 591ifndef CONFIG_CC_STACKPROTECTOR 592KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector) 593endif 594 595# This warning generated too much noise in a regular build. 596# Use make W=1 to enable this warning (see scripts/Makefile.build) 597KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable) 598 599ifdef CONFIG_FRAME_POINTER 600KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 601else 602# Some targets (ARM with Thumb2, for example), can't be built with frame 603# pointers. For those, we don't have FUNCTION_TRACER automatically 604# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 605# incompatible with -fomit-frame-pointer with current GCC, so we don't use 606# -fomit-frame-pointer with FUNCTION_TRACER. 607ifndef CONFIG_FUNCTION_TRACER 608KBUILD_CFLAGS += -fomit-frame-pointer 609endif 610endif 611 612ifdef CONFIG_DEBUG_INFO 613KBUILD_CFLAGS += -g 614KBUILD_AFLAGS += -gdwarf-2 615endif 616 617ifdef CONFIG_DEBUG_INFO_REDUCED 618KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) 619endif 620 621ifdef CONFIG_FUNCTION_TRACER 622ifdef CONFIG_HAVE_FENTRY 623CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY) 624endif 625KBUILD_CFLAGS += -pg $(CC_USING_FENTRY) 626KBUILD_AFLAGS += $(CC_USING_FENTRY) 627ifdef CONFIG_DYNAMIC_FTRACE 628 ifdef CONFIG_HAVE_C_RECORDMCOUNT 629 BUILD_C_RECORDMCOUNT := y 630 export BUILD_C_RECORDMCOUNT 631 endif 632endif 633endif 634 635# We trigger additional mismatches with less inlining 636ifdef CONFIG_DEBUG_SECTION_MISMATCH 637KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) 638endif 639 640# arch Makefile may override CC so keep this after arch Makefile is included 641NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) 642CHECKFLAGS += $(NOSTDINC_FLAGS) 643 644# warn about C99 declaration after statement 645KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,) 646 647# disable pointer signed / unsigned warnings in gcc 4.0 648KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign) 649 650# disable invalid "can't wrap" optimizations for signed / pointers 651KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow) 652 653# conserve stack if available 654KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) 655 656# use the deterministic mode of AR if available 657KBUILD_ARFLAGS := $(call ar-option,D) 658 659# check for 'asm goto' 660ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y) 661 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO 662endif 663 664# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments 665# But warn user when we do so 666warn-assign = \ 667$(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)") 668 669ifneq ($(KCPPFLAGS),) 670 $(call warn-assign,CPPFLAGS) 671 KBUILD_CPPFLAGS += $(KCPPFLAGS) 672endif 673ifneq ($(KAFLAGS),) 674 $(call warn-assign,AFLAGS) 675 KBUILD_AFLAGS += $(KAFLAGS) 676endif 677ifneq ($(KCFLAGS),) 678 $(call warn-assign,CFLAGS) 679 KBUILD_CFLAGS += $(KCFLAGS) 680endif 681 682# Use --build-id when available. 683LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\ 684 $(call cc-ldoption, -Wl$(comma)--build-id,)) 685KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID) 686LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID) 687 688ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 689LDFLAGS_vmlinux += $(call ld-option, -X,) 690endif 691 692# Default kernel image to build when no specific target is given. 693# KBUILD_IMAGE may be overruled on the command line or 694# set in the environment 695# Also any assignments in arch/$(ARCH)/Makefile take precedence over 696# this default value 697export KBUILD_IMAGE ?= vmlinux 698 699# 700# INSTALL_PATH specifies where to place the updated kernel and system map 701# images. Default is /boot, but you can set it to other values 702export INSTALL_PATH ?= /boot 703 704# 705# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 706# relocations required by build roots. This is not defined in the 707# makefile but the argument can be passed to make if needed. 708# 709 710MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 711export MODLIB 712 713# 714# INSTALL_MOD_STRIP, if defined, will cause modules to be 715# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then 716# the default option --strip-debug will be used. Otherwise, 717# INSTALL_MOD_STRIP value will be used as the options to the strip command. 718 719ifdef INSTALL_MOD_STRIP 720ifeq ($(INSTALL_MOD_STRIP),1) 721mod_strip_cmd = $(STRIP) --strip-debug 722else 723mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP) 724endif # INSTALL_MOD_STRIP=1 725else 726mod_strip_cmd = true 727endif # INSTALL_MOD_STRIP 728export mod_strip_cmd 729 730 731ifeq ($(KBUILD_EXTMOD),) 732core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/ 733 734vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \ 735 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 736 $(net-y) $(net-m) $(libs-y) $(libs-m))) 737 738vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \ 739 $(init-n) $(init-) \ 740 $(core-n) $(core-) $(drivers-n) $(drivers-) \ 741 $(net-n) $(net-) $(libs-n) $(libs-)))) 742 743init-y := $(patsubst %/, %/built-in.o, $(init-y)) 744core-y := $(patsubst %/, %/built-in.o, $(core-y)) 745drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y)) 746net-y := $(patsubst %/, %/built-in.o, $(net-y)) 747libs-y1 := $(patsubst %/, %/lib.a, $(libs-y)) 748libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y)) 749libs-y := $(libs-y1) $(libs-y2) 750 751# Externally visible symbols (used by link-vmlinux.sh) 752export KBUILD_VMLINUX_INIT := $(head-y) $(init-y) 753export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y) 754export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 755export LDFLAGS_vmlinux 756 757vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) 758 759# Final link of vmlinux 760 cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) 761quiet_cmd_link-vmlinux = LINK $@ 762 763# Include targets which we want to 764# execute if the rest of the kernel build went well. 765vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE 766ifdef CONFIG_HEADERS_CHECK 767 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check 768endif 769ifdef CONFIG_SAMPLES 770 $(Q)$(MAKE) $(build)=samples 771endif 772ifdef CONFIG_BUILD_DOCSRC 773 $(Q)$(MAKE) $(build)=Documentation 774endif 775 +$(call if_changed,link-vmlinux) 776 777# The actual objects are generated when descending, 778# make sure no implicit rule kicks in 779$(sort $(vmlinux-deps)): $(vmlinux-dirs) ; 780 781# Handle descending into subdirectories listed in $(vmlinux-dirs) 782# Preset locale variables to speed up the build process. Limit locale 783# tweaks to this spot to avoid wrong language settings when running 784# make menuconfig etc. 785# Error messages still appears in the original language 786 787PHONY += $(vmlinux-dirs) 788$(vmlinux-dirs): prepare scripts 789 $(Q)$(MAKE) $(build)=$@ 790 791# Store (new) KERNELRELASE string in include/config/kernel.release 792include/config/kernel.release: include/config/auto.conf FORCE 793 $(Q)rm -f $@ 794 $(Q)echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" > $@ 795 796 797# Things we need to do before we recursively start building the kernel 798# or the modules are listed in "prepare". 799# A multi level approach is used. prepareN is processed before prepareN-1. 800# archprepare is used in arch Makefiles and when processed asm symlink, 801# version.h and scripts_basic is processed / created. 802 803# Listed in dependency order 804PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3 805 806# prepare3 is used to check if we are building in a separate output directory, 807# and if so do: 808# 1) Check that make has not been executed in the kernel src $(srctree) 809prepare3: include/config/kernel.release 810ifneq ($(KBUILD_SRC),) 811 @$(kecho) ' Using $(srctree) as source for kernel' 812 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \ 813 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \ 814 echo >&2 " in the '$(srctree)' directory.";\ 815 /bin/false; \ 816 fi; 817endif 818 819# prepare2 creates a makefile if using a separate output directory 820prepare2: prepare3 outputmakefile asm-generic 821 822prepare1: prepare2 include/linux/version.h include/generated/utsrelease.h \ 823 include/config/auto.conf 824 $(cmd_crmodverdir) 825 826archprepare: archheaders archscripts prepare1 scripts_basic 827 828prepare0: archprepare FORCE 829 $(Q)$(MAKE) $(build)=. 830 831# All the preparing.. 832prepare: prepare0 833 834# Generate some files 835# --------------------------------------------------------------------------- 836 837# KERNELRELEASE can change from a few different places, meaning version.h 838# needs to be updated, so this check is forced on all builds 839 840uts_len := 64 841define filechk_utsrelease.h 842 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 843 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 844 exit 1; \ 845 fi; \ 846 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";) 847endef 848 849define filechk_version.h 850 (echo \#define LINUX_VERSION_CODE $(shell \ 851 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \ 852 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';) 853endef 854 855include/linux/version.h: $(srctree)/Makefile FORCE 856 $(call filechk,version.h) 857 858include/generated/utsrelease.h: include/config/kernel.release FORCE 859 $(call filechk,utsrelease.h) 860 861PHONY += headerdep 862headerdep: 863 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 864 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 865 866# --------------------------------------------------------------------------- 867 868PHONY += depend dep 869depend dep: 870 @echo '*** Warning: make $@ is unnecessary now.' 871 872# --------------------------------------------------------------------------- 873# Firmware install 874INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware 875export INSTALL_FW_PATH 876 877PHONY += firmware_install 878firmware_install: FORCE 879 @mkdir -p $(objtree)/firmware 880 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install 881 882# --------------------------------------------------------------------------- 883# Kernel headers 884 885#Default location for installed headers 886export INSTALL_HDR_PATH = $(objtree)/usr 887 888hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj 889 890# If we do an all arch process set dst to asm-$(hdr-arch) 891hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm) 892 893PHONY += archheaders 894archheaders: 895 896PHONY += archscripts 897archscripts: 898 899PHONY += __headers 900__headers: include/linux/version.h scripts_basic asm-generic archheaders archscripts FORCE 901 $(Q)$(MAKE) $(build)=scripts build_unifdef 902 903PHONY += headers_install_all 904headers_install_all: 905 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install 906 907PHONY += headers_install 908headers_install: __headers 909 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/asm/Kbuild),, \ 910 $(error Headers not exportable for the $(SRCARCH) architecture)) 911 $(Q)$(MAKE) $(hdr-inst)=include 912 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst) 913 914PHONY += headers_check_all 915headers_check_all: headers_install_all 916 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check 917 918PHONY += headers_check 919headers_check: headers_install 920 $(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1 921 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst) HDRCHECK=1 922 923# --------------------------------------------------------------------------- 924# Modules 925 926ifdef CONFIG_MODULES 927 928# By default, build modules as well 929 930all: modules 931 932# Build modules 933# 934# A module can be listed more than once in obj-m resulting in 935# duplicate lines in modules.order files. Those are removed 936# using awk while concatenating to the final file. 937 938PHONY += modules 939modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin 940 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order 941 @$(kecho) ' Building modules, stage 2.'; 942 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 943 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild 944 945modules.builtin: $(vmlinux-dirs:%=%/modules.builtin) 946 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin 947 948%/modules.builtin: include/config/auto.conf 949 $(Q)$(MAKE) $(modbuiltin)=$* 950 951 952# Target to prepare building external modules 953PHONY += modules_prepare 954modules_prepare: prepare scripts 955 956# Target to install modules 957PHONY += modules_install 958modules_install: _modinst_ _modinst_post 959 960PHONY += _modinst_ 961_modinst_: 962 @rm -rf $(MODLIB)/kernel 963 @rm -f $(MODLIB)/source 964 @mkdir -p $(MODLIB)/kernel 965 @ln -s $(srctree) $(MODLIB)/source 966 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 967 rm -f $(MODLIB)/build ; \ 968 ln -s $(objtree) $(MODLIB)/build ; \ 969 fi 970 @cp -f $(objtree)/modules.order $(MODLIB)/ 971 @cp -f $(objtree)/modules.builtin $(MODLIB)/ 972 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 973 974# This depmod is only for convenience to give the initial 975# boot a modules.dep even before / is mounted read-write. However the 976# boot script depmod is the master version. 977PHONY += _modinst_post 978_modinst_post: _modinst_ 979 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst 980 $(call cmd,depmod) 981 982else # CONFIG_MODULES 983 984# Modules not configured 985# --------------------------------------------------------------------------- 986 987modules modules_install: FORCE 988 @echo >&2 989 @echo >&2 "The present kernel configuration has modules disabled." 990 @echo >&2 "Type 'make config' and enable loadable module support." 991 @echo >&2 "Then build a kernel with module support enabled." 992 @echo >&2 993 @exit 1 994 995endif # CONFIG_MODULES 996 997### 998# Cleaning is done on three levels. 999# make clean Delete most generated files 1000# Leave enough to build external modules 1001# make mrproper Delete the current configuration, and all generated files 1002# make distclean Remove editor backup files, patch leftover files and the like 1003 1004# Directories & files removed with 'make clean' 1005CLEAN_DIRS += $(MODVERDIR) 1006 1007# Directories & files removed with 'make mrproper' 1008MRPROPER_DIRS += include/config usr/include include/generated \ 1009 arch/*/include/generated 1010MRPROPER_FILES += .config .config.old .version .old_version \ 1011 include/linux/version.h \ 1012 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS 1013 1014# clean - Delete most, but leave enough to build external modules 1015# 1016clean: rm-dirs := $(CLEAN_DIRS) 1017clean: rm-files := $(CLEAN_FILES) 1018clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples) 1019 1020PHONY += $(clean-dirs) clean archclean 1021$(clean-dirs): 1022 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1023 1024clean: archclean 1025 1026# mrproper - Delete all generated files, including .config 1027# 1028mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS)) 1029mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1030mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts) 1031 1032PHONY += $(mrproper-dirs) mrproper archmrproper 1033$(mrproper-dirs): 1034 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1035 1036mrproper: clean archmrproper $(mrproper-dirs) 1037 $(call cmd,rmdirs) 1038 $(call cmd,rmfiles) 1039 1040# distclean 1041# 1042PHONY += distclean 1043 1044distclean: mrproper 1045 @find $(srctree) $(RCS_FIND_IGNORE) \ 1046 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1047 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \ 1048 -o -name '.*.rej' \ 1049 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \ 1050 -type f -print | xargs rm -f 1051 1052 1053# Packaging of the kernel to various formats 1054# --------------------------------------------------------------------------- 1055# rpm target kept for backward compatibility 1056package-dir := $(srctree)/scripts/package 1057 1058%src-pkg: FORCE 1059 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1060%pkg: include/config/kernel.release FORCE 1061 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1062rpm: include/config/kernel.release FORCE 1063 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1064 1065 1066# Brief documentation of the typical targets used 1067# --------------------------------------------------------------------------- 1068 1069boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1070boards := $(notdir $(boards)) 1071board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1072board-dirs := $(sort $(notdir $(board-dirs:/=))) 1073 1074help: 1075 @echo 'Cleaning targets:' 1076 @echo ' clean - Remove most generated files but keep the config and' 1077 @echo ' enough build support to build external modules' 1078 @echo ' mrproper - Remove all generated files + config + various backup files' 1079 @echo ' distclean - mrproper + remove editor backup and patch files' 1080 @echo '' 1081 @echo 'Configuration targets:' 1082 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1083 @echo '' 1084 @echo 'Other generic targets:' 1085 @echo ' all - Build all targets marked with [*]' 1086 @echo '* vmlinux - Build the bare kernel' 1087 @echo '* modules - Build all modules' 1088 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1089 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH' 1090 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)' 1091 @echo ' dir/ - Build all files in dir and below' 1092 @echo ' dir/file.[oisS] - Build specified target only' 1093 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1094 @echo ' (requires a recent binutils and recent build (System.map))' 1095 @echo ' dir/file.ko - Build module including final link' 1096 @echo ' modules_prepare - Set up for building external modules' 1097 @echo ' tags/TAGS - Generate tags file for editors' 1098 @echo ' cscope - Generate cscope index' 1099 @echo ' gtags - Generate GNU GLOBAL index' 1100 @echo ' kernelrelease - Output the release version string' 1101 @echo ' kernelversion - Output the version stored in Makefile' 1102 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1103 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1104 echo '' 1105 @echo 'Static analysers' 1106 @echo ' checkstack - Generate a list of stack hogs' 1107 @echo ' namespacecheck - Name space analysis on compiled kernel' 1108 @echo ' versioncheck - Sanity check on version.h usage' 1109 @echo ' includecheck - Check for duplicate included header files' 1110 @echo ' export_report - List the usages of all exported symbols' 1111 @echo ' headers_check - Sanity check on exported headers' 1112 @echo ' headerdep - Detect inclusion cycles in headers' 1113 @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help 1114 @echo '' 1115 @echo 'Kernel packaging:' 1116 @$(MAKE) $(build)=$(package-dir) help 1117 @echo '' 1118 @echo 'Documentation targets:' 1119 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp 1120 @echo '' 1121 @echo 'Architecture specific targets ($(SRCARCH)):' 1122 @$(if $(archhelp),$(archhelp),\ 1123 echo ' No architecture specific help defined for $(SRCARCH)') 1124 @echo '' 1125 @$(if $(boards), \ 1126 $(foreach b, $(boards), \ 1127 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1128 echo '') 1129 @$(if $(board-dirs), \ 1130 $(foreach b, $(board-dirs), \ 1131 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1132 printf " %-16s - Show all of the above\\n" help-boards; \ 1133 echo '') 1134 1135 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1136 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1137 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1138 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)' 1139 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1140 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1141 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where' 1142 @echo ' 1: warnings which may be relevant and do not occur too often' 1143 @echo ' 2: warnings which occur quite often but may still be relevant' 1144 @echo ' 3: more obscure warnings, can most likely be ignored' 1145 @echo ' Multiple levels can be combined with W=12 or W=123' 1146 @echo '' 1147 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1148 @echo 'For further info see the ./README file' 1149 1150 1151help-board-dirs := $(addprefix help-,$(board-dirs)) 1152 1153help-boards: $(help-board-dirs) 1154 1155boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)) 1156 1157$(help-board-dirs): help-%: 1158 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1159 @$(if $(boards-per-dir), \ 1160 $(foreach b, $(boards-per-dir), \ 1161 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1162 echo '') 1163 1164 1165# Documentation targets 1166# --------------------------------------------------------------------------- 1167%docs: scripts_basic FORCE 1168 $(Q)$(MAKE) $(build)=scripts build_docproc 1169 $(Q)$(MAKE) $(build)=Documentation/DocBook $@ 1170 1171else # KBUILD_EXTMOD 1172 1173### 1174# External module support. 1175# When building external modules the kernel used as basis is considered 1176# read-only, and no consistency checks are made and the make 1177# system is not used on the basis kernel. If updates are required 1178# in the basis kernel ordinary make commands (without M=...) must 1179# be used. 1180# 1181# The following are the only valid targets when building external 1182# modules. 1183# make M=dir clean Delete all automatically generated files 1184# make M=dir modules Make all modules in specified dir 1185# make M=dir Same as 'make M=dir modules' 1186# make M=dir modules_install 1187# Install the modules built in the module directory 1188# Assumes install directory is already created 1189 1190# We are always building modules 1191KBUILD_MODULES := 1 1192PHONY += crmodverdir 1193crmodverdir: 1194 $(cmd_crmodverdir) 1195 1196PHONY += $(objtree)/Module.symvers 1197$(objtree)/Module.symvers: 1198 @test -e $(objtree)/Module.symvers || ( \ 1199 echo; \ 1200 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \ 1201 echo " is missing; modules will have no dependencies and modversions."; \ 1202 echo ) 1203 1204module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD)) 1205PHONY += $(module-dirs) modules 1206$(module-dirs): crmodverdir $(objtree)/Module.symvers 1207 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@) 1208 1209modules: $(module-dirs) 1210 @$(kecho) ' Building modules, stage 2.'; 1211 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1212 1213PHONY += modules_install 1214modules_install: _emodinst_ _emodinst_post 1215 1216install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra) 1217PHONY += _emodinst_ 1218_emodinst_: 1219 $(Q)mkdir -p $(MODLIB)/$(install-dir) 1220 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1221 1222PHONY += _emodinst_post 1223_emodinst_post: _emodinst_ 1224 $(call cmd,depmod) 1225 1226clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD)) 1227 1228PHONY += $(clean-dirs) clean 1229$(clean-dirs): 1230 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1231 1232clean: rm-dirs := $(MODVERDIR) 1233clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers 1234 1235help: 1236 @echo ' Building external modules.' 1237 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1238 @echo '' 1239 @echo ' modules - default target, build the module(s)' 1240 @echo ' modules_install - install the module' 1241 @echo ' clean - remove generated files in module directory only' 1242 @echo '' 1243 1244# Dummies... 1245PHONY += prepare scripts 1246prepare: ; 1247scripts: ; 1248endif # KBUILD_EXTMOD 1249 1250clean: $(clean-dirs) 1251 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1252 $(call cmd,rmdirs) 1253 $(call cmd,rmfiles) 1254 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1255 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \ 1256 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1257 -o -name '*.symtypes' -o -name 'modules.order' \ 1258 -o -name modules.builtin -o -name '.tmp_*.o.*' \ 1259 -o -name '*.gcno' \) -type f -print | xargs rm -f 1260 1261# Generate tags for editors 1262# --------------------------------------------------------------------------- 1263quiet_cmd_tags = GEN $@ 1264 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@ 1265 1266tags TAGS cscope gtags: FORCE 1267 $(call cmd,tags) 1268 1269# Scripts to check various things for consistency 1270# --------------------------------------------------------------------------- 1271 1272PHONY += includecheck versioncheck coccicheck namespacecheck export_report 1273 1274includecheck: 1275 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1276 -name '*.[hcS]' -type f -print | sort \ 1277 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1278 1279versioncheck: 1280 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1281 -name '*.[hcS]' -type f -print | sort \ 1282 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1283 1284coccicheck: 1285 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@ 1286 1287namespacecheck: 1288 $(PERL) $(srctree)/scripts/namespace.pl 1289 1290export_report: 1291 $(PERL) $(srctree)/scripts/export_report.pl 1292 1293endif #ifeq ($(config-targets),1) 1294endif #ifeq ($(mixed-targets),1) 1295 1296PHONY += checkstack kernelrelease kernelversion 1297 1298# UML needs a little special treatment here. It wants to use the host 1299# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1300# else wants $(ARCH), including people doing cross-builds, which means 1301# that $(SUBARCH) doesn't work here. 1302ifeq ($(ARCH), um) 1303CHECKSTACK_ARCH := $(SUBARCH) 1304else 1305CHECKSTACK_ARCH := $(ARCH) 1306endif 1307checkstack: 1308 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1309 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1310 1311kernelrelease: 1312 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1313 1314kernelversion: 1315 @echo $(KERNELVERSION) 1316 1317# Clear a bunch of variables before executing the submake 1318tools/: FORCE 1319 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS= -C $(src)/tools/ 1320 1321tools/%: FORCE 1322 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS= -C $(src)/tools/ $* 1323 1324# Single targets 1325# --------------------------------------------------------------------------- 1326# Single targets are compatible with: 1327# - build with mixed source and output 1328# - build with separate output dir 'make O=...' 1329# - external modules 1330# 1331# target-dir => where to store outputfile 1332# build-dir => directory in kernel source tree to use 1333 1334ifeq ($(KBUILD_EXTMOD),) 1335 build-dir = $(patsubst %/,%,$(dir $@)) 1336 target-dir = $(dir $@) 1337else 1338 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@))) 1339 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash)) 1340 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@)) 1341endif 1342 1343%.s: %.c prepare scripts FORCE 1344 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1345%.i: %.c prepare scripts FORCE 1346 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1347%.o: %.c prepare scripts FORCE 1348 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1349%.lst: %.c prepare scripts FORCE 1350 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1351%.s: %.S prepare scripts FORCE 1352 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1353%.o: %.S prepare scripts FORCE 1354 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1355%.symtypes: %.c prepare scripts FORCE 1356 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1357 1358# Modules 1359/: prepare scripts FORCE 1360 $(cmd_crmodverdir) 1361 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1362 $(build)=$(build-dir) 1363%/: prepare scripts FORCE 1364 $(cmd_crmodverdir) 1365 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1366 $(build)=$(build-dir) 1367%.ko: prepare scripts FORCE 1368 $(cmd_crmodverdir) 1369 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1370 $(build)=$(build-dir) $(@:.ko=.o) 1371 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1372 1373# FIXME Should go into a make.lib or something 1374# =========================================================================== 1375 1376quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs))) 1377 cmd_rmdirs = rm -rf $(rm-dirs) 1378 1379quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1380 cmd_rmfiles = rm -f $(rm-files) 1381 1382# Run depmod only if we have System.map and depmod is executable 1383quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) 1384 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1385 $(KERNELRELEASE) 1386 1387# Create temporary dir for module support files 1388# clean it up only when building all modules 1389cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \ 1390 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*) 1391 1392# read all saved command lines 1393 1394targets := $(wildcard $(sort $(targets))) 1395cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd)) 1396 1397ifneq ($(cmd_files),) 1398 $(cmd_files): ; # Do not try to update included dependency files 1399 include $(cmd_files) 1400endif 1401 1402# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir 1403# Usage: 1404# $(Q)$(MAKE) $(clean)=dir 1405clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj 1406 1407endif # skip-makefile 1408 1409PHONY += FORCE 1410FORCE: 1411 1412# Declare the contents of the .PHONY variable as phony. We keep that 1413# information in a variable so we can use it in if_changed and friends. 1414.PHONY: $(PHONY) 1415