1VERSION = 3 2PATCHLEVEL = 7 3SUBLEVEL = 0 4EXTRAVERSION = -rc1 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 450version_h := include/generated/uapi/linux/version.h 451 452no-dot-config-targets := clean mrproper distclean \ 453 cscope gtags TAGS tags help %docs check% coccicheck \ 454 $(version_h) headers_% archheaders archscripts \ 455 kernelversion %src-pkg 456 457config-targets := 0 458mixed-targets := 0 459dot-config := 1 460 461ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 462 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 463 dot-config := 0 464 endif 465endif 466 467ifeq ($(KBUILD_EXTMOD),) 468 ifneq ($(filter config %config,$(MAKECMDGOALS)),) 469 config-targets := 1 470 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),) 471 mixed-targets := 1 472 endif 473 endif 474endif 475 476ifeq ($(mixed-targets),1) 477# =========================================================================== 478# We're called with mixed targets (*config and build targets). 479# Handle them one by one. 480 481%:: FORCE 482 $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@ 483 484else 485ifeq ($(config-targets),1) 486# =========================================================================== 487# *config targets only - make sure prerequisites are updated, and descend 488# in scripts/kconfig to make the *config target 489 490# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 491# KBUILD_DEFCONFIG may point out an alternative default configuration 492# used for 'make defconfig' 493include $(srctree)/arch/$(SRCARCH)/Makefile 494export KBUILD_DEFCONFIG KBUILD_KCONFIG 495 496config: scripts_basic outputmakefile FORCE 497 $(Q)mkdir -p include/linux include/config 498 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 499 500%config: scripts_basic outputmakefile FORCE 501 $(Q)mkdir -p include/linux include/config 502 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 503 504else 505# =========================================================================== 506# Build targets only - this includes vmlinux, arch specific targets, clean 507# targets and others. In general all targets except *config targets. 508 509ifeq ($(KBUILD_EXTMOD),) 510# Additional helpers built in scripts/ 511# Carefully list dependencies so we do not try to build scripts twice 512# in parallel 513PHONY += scripts 514scripts: scripts_basic include/config/auto.conf include/config/tristate.conf 515 $(Q)$(MAKE) $(build)=$(@) 516 517# Objects we will link into vmlinux / subdirs we need to visit 518init-y := init/ 519drivers-y := drivers/ sound/ firmware/ 520net-y := net/ 521libs-y := lib/ 522core-y := usr/ 523endif # KBUILD_EXTMOD 524 525ifeq ($(dot-config),1) 526# Read in config 527-include include/config/auto.conf 528 529ifeq ($(KBUILD_EXTMOD),) 530# Read in dependencies to all Kconfig* files, make sure to run 531# oldconfig if changes are detected. 532-include include/config/auto.conf.cmd 533 534# To avoid any implicit rule to kick in, define an empty command 535$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ; 536 537# If .config is newer than include/config/auto.conf, someone tinkered 538# with it and forgot to run make oldconfig. 539# if auto.conf.cmd is missing then we are probably in a cleaned tree so 540# we execute the config step to be sure to catch updated Kconfig files 541include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd 542 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig 543else 544# external modules needs include/generated/autoconf.h and include/config/auto.conf 545# but do not care if they are up-to-date. Use auto.conf to trigger the test 546PHONY += include/config/auto.conf 547 548include/config/auto.conf: 549 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 550 echo >&2; \ 551 echo >&2 " ERROR: Kernel configuration is invalid."; \ 552 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 553 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 554 echo >&2 ; \ 555 /bin/false) 556 557endif # KBUILD_EXTMOD 558 559else 560# Dummy target needed, because used as prerequisite 561include/config/auto.conf: ; 562endif # $(dot-config) 563 564# The all: target is the default when no target is given on the 565# command line. 566# This allow a user to issue only 'make' to build a kernel including modules 567# Defaults to vmlinux, but the arch makefile usually adds further targets 568all: vmlinux 569 570ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 571KBUILD_CFLAGS += -Os 572else 573KBUILD_CFLAGS += -O2 574endif 575 576include $(srctree)/arch/$(SRCARCH)/Makefile 577 578ifdef CONFIG_READABLE_ASM 579# Disable optimizations that make assembler listings hard to read. 580# reorder blocks reorders the control in the function 581# ipa clone creates specialized cloned functions 582# partial inlining inlines only parts of functions 583KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \ 584 $(call cc-option,-fno-ipa-cp-clone,) \ 585 $(call cc-option,-fno-partial-inlining) 586endif 587 588ifneq ($(CONFIG_FRAME_WARN),0) 589KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN}) 590endif 591 592# Force gcc to behave correct even for buggy distributions 593ifndef CONFIG_CC_STACKPROTECTOR 594KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector) 595endif 596 597# This warning generated too much noise in a regular build. 598# Use make W=1 to enable this warning (see scripts/Makefile.build) 599KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable) 600 601ifdef CONFIG_FRAME_POINTER 602KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 603else 604# Some targets (ARM with Thumb2, for example), can't be built with frame 605# pointers. For those, we don't have FUNCTION_TRACER automatically 606# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 607# incompatible with -fomit-frame-pointer with current GCC, so we don't use 608# -fomit-frame-pointer with FUNCTION_TRACER. 609ifndef CONFIG_FUNCTION_TRACER 610KBUILD_CFLAGS += -fomit-frame-pointer 611endif 612endif 613 614ifdef CONFIG_DEBUG_INFO 615KBUILD_CFLAGS += -g 616KBUILD_AFLAGS += -gdwarf-2 617endif 618 619ifdef CONFIG_DEBUG_INFO_REDUCED 620KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) 621endif 622 623ifdef CONFIG_FUNCTION_TRACER 624ifdef CONFIG_HAVE_FENTRY 625CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY) 626endif 627KBUILD_CFLAGS += -pg $(CC_USING_FENTRY) 628KBUILD_AFLAGS += $(CC_USING_FENTRY) 629ifdef CONFIG_DYNAMIC_FTRACE 630 ifdef CONFIG_HAVE_C_RECORDMCOUNT 631 BUILD_C_RECORDMCOUNT := y 632 export BUILD_C_RECORDMCOUNT 633 endif 634endif 635endif 636 637# We trigger additional mismatches with less inlining 638ifdef CONFIG_DEBUG_SECTION_MISMATCH 639KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) 640endif 641 642# arch Makefile may override CC so keep this after arch Makefile is included 643NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) 644CHECKFLAGS += $(NOSTDINC_FLAGS) 645 646# warn about C99 declaration after statement 647KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,) 648 649# disable pointer signed / unsigned warnings in gcc 4.0 650KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign) 651 652# disable invalid "can't wrap" optimizations for signed / pointers 653KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow) 654 655# conserve stack if available 656KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) 657 658# use the deterministic mode of AR if available 659KBUILD_ARFLAGS := $(call ar-option,D) 660 661# check for 'asm goto' 662ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y) 663 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO 664endif 665 666# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments 667KBUILD_CPPFLAGS += $(KCPPFLAGS) 668KBUILD_AFLAGS += $(KAFLAGS) 669KBUILD_CFLAGS += $(KCFLAGS) 670 671# Use --build-id when available. 672LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\ 673 $(call cc-ldoption, -Wl$(comma)--build-id,)) 674KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID) 675LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID) 676 677ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 678LDFLAGS_vmlinux += $(call ld-option, -X,) 679endif 680 681# Default kernel image to build when no specific target is given. 682# KBUILD_IMAGE may be overruled on the command line or 683# set in the environment 684# Also any assignments in arch/$(ARCH)/Makefile take precedence over 685# this default value 686export KBUILD_IMAGE ?= vmlinux 687 688# 689# INSTALL_PATH specifies where to place the updated kernel and system map 690# images. Default is /boot, but you can set it to other values 691export INSTALL_PATH ?= /boot 692 693# 694# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 695# relocations required by build roots. This is not defined in the 696# makefile but the argument can be passed to make if needed. 697# 698 699MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 700export MODLIB 701 702# 703# INSTALL_MOD_STRIP, if defined, will cause modules to be 704# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then 705# the default option --strip-debug will be used. Otherwise, 706# INSTALL_MOD_STRIP value will be used as the options to the strip command. 707 708ifdef INSTALL_MOD_STRIP 709ifeq ($(INSTALL_MOD_STRIP),1) 710mod_strip_cmd = $(STRIP) --strip-debug 711else 712mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP) 713endif # INSTALL_MOD_STRIP=1 714else 715mod_strip_cmd = true 716endif # INSTALL_MOD_STRIP 717export mod_strip_cmd 718 719 720ifeq ($(KBUILD_EXTMOD),) 721core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/ 722 723vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \ 724 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 725 $(net-y) $(net-m) $(libs-y) $(libs-m))) 726 727vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \ 728 $(init-n) $(init-) \ 729 $(core-n) $(core-) $(drivers-n) $(drivers-) \ 730 $(net-n) $(net-) $(libs-n) $(libs-)))) 731 732init-y := $(patsubst %/, %/built-in.o, $(init-y)) 733core-y := $(patsubst %/, %/built-in.o, $(core-y)) 734drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y)) 735net-y := $(patsubst %/, %/built-in.o, $(net-y)) 736libs-y1 := $(patsubst %/, %/lib.a, $(libs-y)) 737libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y)) 738libs-y := $(libs-y1) $(libs-y2) 739 740# Externally visible symbols (used by link-vmlinux.sh) 741export KBUILD_VMLINUX_INIT := $(head-y) $(init-y) 742export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y) 743export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 744export LDFLAGS_vmlinux 745 746vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) 747 748# Final link of vmlinux 749 cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) 750quiet_cmd_link-vmlinux = LINK $@ 751 752# Include targets which we want to 753# execute if the rest of the kernel build went well. 754vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE 755ifdef CONFIG_HEADERS_CHECK 756 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check 757endif 758ifdef CONFIG_SAMPLES 759 $(Q)$(MAKE) $(build)=samples 760endif 761ifdef CONFIG_BUILD_DOCSRC 762 $(Q)$(MAKE) $(build)=Documentation 763endif 764 +$(call if_changed,link-vmlinux) 765 766# The actual objects are generated when descending, 767# make sure no implicit rule kicks in 768$(sort $(vmlinux-deps)): $(vmlinux-dirs) ; 769 770# Handle descending into subdirectories listed in $(vmlinux-dirs) 771# Preset locale variables to speed up the build process. Limit locale 772# tweaks to this spot to avoid wrong language settings when running 773# make menuconfig etc. 774# Error messages still appears in the original language 775 776PHONY += $(vmlinux-dirs) 777$(vmlinux-dirs): prepare scripts 778 $(Q)$(MAKE) $(build)=$@ 779 780# Store (new) KERNELRELASE string in include/config/kernel.release 781include/config/kernel.release: include/config/auto.conf FORCE 782 $(Q)rm -f $@ 783 $(Q)echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" > $@ 784 785 786# Things we need to do before we recursively start building the kernel 787# or the modules are listed in "prepare". 788# A multi level approach is used. prepareN is processed before prepareN-1. 789# archprepare is used in arch Makefiles and when processed asm symlink, 790# version.h and scripts_basic is processed / created. 791 792# Listed in dependency order 793PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3 794 795# prepare3 is used to check if we are building in a separate output directory, 796# and if so do: 797# 1) Check that make has not been executed in the kernel src $(srctree) 798prepare3: include/config/kernel.release 799ifneq ($(KBUILD_SRC),) 800 @$(kecho) ' Using $(srctree) as source for kernel' 801 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \ 802 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \ 803 echo >&2 " in the '$(srctree)' directory.";\ 804 /bin/false; \ 805 fi; 806endif 807 808# prepare2 creates a makefile if using a separate output directory 809prepare2: prepare3 outputmakefile asm-generic 810 811prepare1: prepare2 $(version_h) include/generated/utsrelease.h \ 812 include/config/auto.conf 813 $(cmd_crmodverdir) 814 815archprepare: archheaders archscripts prepare1 scripts_basic 816 817prepare0: archprepare FORCE 818 $(Q)$(MAKE) $(build)=. 819 820# All the preparing.. 821prepare: prepare0 822 823# Generate some files 824# --------------------------------------------------------------------------- 825 826# KERNELRELEASE can change from a few different places, meaning version.h 827# needs to be updated, so this check is forced on all builds 828 829uts_len := 64 830define filechk_utsrelease.h 831 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 832 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 833 exit 1; \ 834 fi; \ 835 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";) 836endef 837 838define filechk_version.h 839 (echo \#define LINUX_VERSION_CODE $(shell \ 840 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \ 841 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';) 842endef 843 844$(version_h): $(srctree)/Makefile FORCE 845 $(call filechk,version.h) 846 847include/generated/utsrelease.h: include/config/kernel.release FORCE 848 $(call filechk,utsrelease.h) 849 850PHONY += headerdep 851headerdep: 852 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 853 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 854 855# --------------------------------------------------------------------------- 856 857PHONY += depend dep 858depend dep: 859 @echo '*** Warning: make $@ is unnecessary now.' 860 861# --------------------------------------------------------------------------- 862# Firmware install 863INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware 864export INSTALL_FW_PATH 865 866PHONY += firmware_install 867firmware_install: FORCE 868 @mkdir -p $(objtree)/firmware 869 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install 870 871# --------------------------------------------------------------------------- 872# Kernel headers 873 874#Default location for installed headers 875export INSTALL_HDR_PATH = $(objtree)/usr 876 877hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj 878 879# If we do an all arch process set dst to asm-$(hdr-arch) 880hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm) 881 882PHONY += archheaders 883archheaders: 884 885PHONY += archscripts 886archscripts: 887 888PHONY += __headers 889__headers: $(version_h) scripts_basic asm-generic archheaders archscripts FORCE 890 $(Q)$(MAKE) $(build)=scripts build_unifdef 891 892PHONY += headers_install_all 893headers_install_all: 894 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install 895 896PHONY += headers_install 897headers_install: __headers 898 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \ 899 $(error Headers not exportable for the $(SRCARCH) architecture)) 900 $(Q)$(MAKE) $(hdr-inst)=include/uapi 901 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) 902 903PHONY += headers_check_all 904headers_check_all: headers_install_all 905 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check 906 907PHONY += headers_check 908headers_check: headers_install 909 $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1 910 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1 911 912# --------------------------------------------------------------------------- 913# Modules 914 915ifdef CONFIG_MODULES 916 917# By default, build modules as well 918 919all: modules 920 921# Build modules 922# 923# A module can be listed more than once in obj-m resulting in 924# duplicate lines in modules.order files. Those are removed 925# using awk while concatenating to the final file. 926 927PHONY += modules 928modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin 929 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order 930 @$(kecho) ' Building modules, stage 2.'; 931 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 932 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild 933 934modules.builtin: $(vmlinux-dirs:%=%/modules.builtin) 935 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin 936 937%/modules.builtin: include/config/auto.conf 938 $(Q)$(MAKE) $(modbuiltin)=$* 939 940 941# Target to prepare building external modules 942PHONY += modules_prepare 943modules_prepare: prepare scripts 944 945# Target to install modules 946PHONY += modules_install 947modules_install: _modinst_ _modinst_post 948 949PHONY += _modinst_ 950_modinst_: 951 @rm -rf $(MODLIB)/kernel 952 @rm -f $(MODLIB)/source 953 @mkdir -p $(MODLIB)/kernel 954 @ln -s $(srctree) $(MODLIB)/source 955 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 956 rm -f $(MODLIB)/build ; \ 957 ln -s $(objtree) $(MODLIB)/build ; \ 958 fi 959 @cp -f $(objtree)/modules.order $(MODLIB)/ 960 @cp -f $(objtree)/modules.builtin $(MODLIB)/ 961 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 962 963# This depmod is only for convenience to give the initial 964# boot a modules.dep even before / is mounted read-write. However the 965# boot script depmod is the master version. 966PHONY += _modinst_post 967_modinst_post: _modinst_ 968 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst 969 $(call cmd,depmod) 970 971else # CONFIG_MODULES 972 973# Modules not configured 974# --------------------------------------------------------------------------- 975 976modules modules_install: FORCE 977 @echo >&2 978 @echo >&2 "The present kernel configuration has modules disabled." 979 @echo >&2 "Type 'make config' and enable loadable module support." 980 @echo >&2 "Then build a kernel with module support enabled." 981 @echo >&2 982 @exit 1 983 984endif # CONFIG_MODULES 985 986### 987# Cleaning is done on three levels. 988# make clean Delete most generated files 989# Leave enough to build external modules 990# make mrproper Delete the current configuration, and all generated files 991# make distclean Remove editor backup files, patch leftover files and the like 992 993# Directories & files removed with 'make clean' 994CLEAN_DIRS += $(MODVERDIR) 995 996# Directories & files removed with 'make mrproper' 997MRPROPER_DIRS += include/config usr/include include/generated \ 998 arch/*/include/generated 999MRPROPER_FILES += .config .config.old .version .old_version $(version_h) \ 1000 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \ 1001 signing_key.priv signing_key.x509 x509.genkey \ 1002 extra_certificates signing_key.x509.keyid \ 1003 signing_key.x509.signer 1004 1005# clean - Delete most, but leave enough to build external modules 1006# 1007clean: rm-dirs := $(CLEAN_DIRS) 1008clean: rm-files := $(CLEAN_FILES) 1009clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples) 1010 1011PHONY += $(clean-dirs) clean archclean 1012$(clean-dirs): 1013 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1014 1015clean: archclean 1016 1017# mrproper - Delete all generated files, including .config 1018# 1019mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS)) 1020mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1021mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts) 1022 1023PHONY += $(mrproper-dirs) mrproper archmrproper 1024$(mrproper-dirs): 1025 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1026 1027mrproper: clean archmrproper $(mrproper-dirs) 1028 $(call cmd,rmdirs) 1029 $(call cmd,rmfiles) 1030 1031# distclean 1032# 1033PHONY += distclean 1034 1035distclean: mrproper 1036 @find $(srctree) $(RCS_FIND_IGNORE) \ 1037 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1038 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \ 1039 -o -name '.*.rej' \ 1040 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \ 1041 -type f -print | xargs rm -f 1042 1043 1044# Packaging of the kernel to various formats 1045# --------------------------------------------------------------------------- 1046# rpm target kept for backward compatibility 1047package-dir := $(srctree)/scripts/package 1048 1049%src-pkg: FORCE 1050 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1051%pkg: include/config/kernel.release FORCE 1052 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1053rpm: include/config/kernel.release FORCE 1054 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1055 1056 1057# Brief documentation of the typical targets used 1058# --------------------------------------------------------------------------- 1059 1060boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1061boards := $(notdir $(boards)) 1062board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1063board-dirs := $(sort $(notdir $(board-dirs:/=))) 1064 1065help: 1066 @echo 'Cleaning targets:' 1067 @echo ' clean - Remove most generated files but keep the config and' 1068 @echo ' enough build support to build external modules' 1069 @echo ' mrproper - Remove all generated files + config + various backup files' 1070 @echo ' distclean - mrproper + remove editor backup and patch files' 1071 @echo '' 1072 @echo 'Configuration targets:' 1073 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1074 @echo '' 1075 @echo 'Other generic targets:' 1076 @echo ' all - Build all targets marked with [*]' 1077 @echo '* vmlinux - Build the bare kernel' 1078 @echo '* modules - Build all modules' 1079 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1080 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH' 1081 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)' 1082 @echo ' dir/ - Build all files in dir and below' 1083 @echo ' dir/file.[oisS] - Build specified target only' 1084 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1085 @echo ' (requires a recent binutils and recent build (System.map))' 1086 @echo ' dir/file.ko - Build module including final link' 1087 @echo ' modules_prepare - Set up for building external modules' 1088 @echo ' tags/TAGS - Generate tags file for editors' 1089 @echo ' cscope - Generate cscope index' 1090 @echo ' gtags - Generate GNU GLOBAL index' 1091 @echo ' kernelrelease - Output the release version string' 1092 @echo ' kernelversion - Output the version stored in Makefile' 1093 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1094 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1095 echo '' 1096 @echo 'Static analysers' 1097 @echo ' checkstack - Generate a list of stack hogs' 1098 @echo ' namespacecheck - Name space analysis on compiled kernel' 1099 @echo ' versioncheck - Sanity check on version.h usage' 1100 @echo ' includecheck - Check for duplicate included header files' 1101 @echo ' export_report - List the usages of all exported symbols' 1102 @echo ' headers_check - Sanity check on exported headers' 1103 @echo ' headerdep - Detect inclusion cycles in headers' 1104 @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help 1105 @echo '' 1106 @echo 'Kernel packaging:' 1107 @$(MAKE) $(build)=$(package-dir) help 1108 @echo '' 1109 @echo 'Documentation targets:' 1110 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp 1111 @echo '' 1112 @echo 'Architecture specific targets ($(SRCARCH)):' 1113 @$(if $(archhelp),$(archhelp),\ 1114 echo ' No architecture specific help defined for $(SRCARCH)') 1115 @echo '' 1116 @$(if $(boards), \ 1117 $(foreach b, $(boards), \ 1118 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1119 echo '') 1120 @$(if $(board-dirs), \ 1121 $(foreach b, $(board-dirs), \ 1122 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1123 printf " %-16s - Show all of the above\\n" help-boards; \ 1124 echo '') 1125 1126 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1127 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1128 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1129 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)' 1130 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1131 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1132 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where' 1133 @echo ' 1: warnings which may be relevant and do not occur too often' 1134 @echo ' 2: warnings which occur quite often but may still be relevant' 1135 @echo ' 3: more obscure warnings, can most likely be ignored' 1136 @echo ' Multiple levels can be combined with W=12 or W=123' 1137 @echo '' 1138 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1139 @echo 'For further info see the ./README file' 1140 1141 1142help-board-dirs := $(addprefix help-,$(board-dirs)) 1143 1144help-boards: $(help-board-dirs) 1145 1146boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)) 1147 1148$(help-board-dirs): help-%: 1149 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1150 @$(if $(boards-per-dir), \ 1151 $(foreach b, $(boards-per-dir), \ 1152 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1153 echo '') 1154 1155 1156# Documentation targets 1157# --------------------------------------------------------------------------- 1158%docs: scripts_basic FORCE 1159 $(Q)$(MAKE) $(build)=scripts build_docproc 1160 $(Q)$(MAKE) $(build)=Documentation/DocBook $@ 1161 1162else # KBUILD_EXTMOD 1163 1164### 1165# External module support. 1166# When building external modules the kernel used as basis is considered 1167# read-only, and no consistency checks are made and the make 1168# system is not used on the basis kernel. If updates are required 1169# in the basis kernel ordinary make commands (without M=...) must 1170# be used. 1171# 1172# The following are the only valid targets when building external 1173# modules. 1174# make M=dir clean Delete all automatically generated files 1175# make M=dir modules Make all modules in specified dir 1176# make M=dir Same as 'make M=dir modules' 1177# make M=dir modules_install 1178# Install the modules built in the module directory 1179# Assumes install directory is already created 1180 1181# We are always building modules 1182KBUILD_MODULES := 1 1183PHONY += crmodverdir 1184crmodverdir: 1185 $(cmd_crmodverdir) 1186 1187PHONY += $(objtree)/Module.symvers 1188$(objtree)/Module.symvers: 1189 @test -e $(objtree)/Module.symvers || ( \ 1190 echo; \ 1191 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \ 1192 echo " is missing; modules will have no dependencies and modversions."; \ 1193 echo ) 1194 1195module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD)) 1196PHONY += $(module-dirs) modules 1197$(module-dirs): crmodverdir $(objtree)/Module.symvers 1198 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@) 1199 1200modules: $(module-dirs) 1201 @$(kecho) ' Building modules, stage 2.'; 1202 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1203 1204PHONY += modules_install 1205modules_install: _emodinst_ _emodinst_post 1206 1207install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra) 1208PHONY += _emodinst_ 1209_emodinst_: 1210 $(Q)mkdir -p $(MODLIB)/$(install-dir) 1211 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1212 1213PHONY += _emodinst_post 1214_emodinst_post: _emodinst_ 1215 $(call cmd,depmod) 1216 1217clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD)) 1218 1219PHONY += $(clean-dirs) clean 1220$(clean-dirs): 1221 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1222 1223clean: rm-dirs := $(MODVERDIR) 1224clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers 1225 1226help: 1227 @echo ' Building external modules.' 1228 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1229 @echo '' 1230 @echo ' modules - default target, build the module(s)' 1231 @echo ' modules_install - install the module' 1232 @echo ' clean - remove generated files in module directory only' 1233 @echo '' 1234 1235# Dummies... 1236PHONY += prepare scripts 1237prepare: ; 1238scripts: ; 1239endif # KBUILD_EXTMOD 1240 1241clean: $(clean-dirs) 1242 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1243 $(call cmd,rmdirs) 1244 $(call cmd,rmfiles) 1245 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1246 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \ 1247 -o -name '*.ko.*' \ 1248 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1249 -o -name '*.symtypes' -o -name 'modules.order' \ 1250 -o -name modules.builtin -o -name '.tmp_*.o.*' \ 1251 -o -name '*.gcno' \) -type f -print | xargs rm -f 1252 1253# Generate tags for editors 1254# --------------------------------------------------------------------------- 1255quiet_cmd_tags = GEN $@ 1256 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@ 1257 1258tags TAGS cscope gtags: FORCE 1259 $(call cmd,tags) 1260 1261# Scripts to check various things for consistency 1262# --------------------------------------------------------------------------- 1263 1264PHONY += includecheck versioncheck coccicheck namespacecheck export_report 1265 1266includecheck: 1267 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1268 -name '*.[hcS]' -type f -print | sort \ 1269 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1270 1271versioncheck: 1272 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1273 -name '*.[hcS]' -type f -print | sort \ 1274 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1275 1276coccicheck: 1277 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@ 1278 1279namespacecheck: 1280 $(PERL) $(srctree)/scripts/namespace.pl 1281 1282export_report: 1283 $(PERL) $(srctree)/scripts/export_report.pl 1284 1285endif #ifeq ($(config-targets),1) 1286endif #ifeq ($(mixed-targets),1) 1287 1288PHONY += checkstack kernelrelease kernelversion 1289 1290# UML needs a little special treatment here. It wants to use the host 1291# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1292# else wants $(ARCH), including people doing cross-builds, which means 1293# that $(SUBARCH) doesn't work here. 1294ifeq ($(ARCH), um) 1295CHECKSTACK_ARCH := $(SUBARCH) 1296else 1297CHECKSTACK_ARCH := $(ARCH) 1298endif 1299checkstack: 1300 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1301 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1302 1303kernelrelease: 1304 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1305 1306kernelversion: 1307 @echo $(KERNELVERSION) 1308 1309# Clear a bunch of variables before executing the submake 1310tools/: FORCE 1311 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS= -C $(src)/tools/ 1312 1313tools/%: FORCE 1314 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS= -C $(src)/tools/ $* 1315 1316# Single targets 1317# --------------------------------------------------------------------------- 1318# Single targets are compatible with: 1319# - build with mixed source and output 1320# - build with separate output dir 'make O=...' 1321# - external modules 1322# 1323# target-dir => where to store outputfile 1324# build-dir => directory in kernel source tree to use 1325 1326ifeq ($(KBUILD_EXTMOD),) 1327 build-dir = $(patsubst %/,%,$(dir $@)) 1328 target-dir = $(dir $@) 1329else 1330 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@))) 1331 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash)) 1332 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@)) 1333endif 1334 1335%.s: %.c prepare scripts FORCE 1336 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1337%.i: %.c prepare scripts FORCE 1338 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1339%.o: %.c prepare scripts FORCE 1340 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1341%.lst: %.c prepare scripts FORCE 1342 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1343%.s: %.S prepare scripts FORCE 1344 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1345%.o: %.S prepare scripts FORCE 1346 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1347%.symtypes: %.c prepare scripts FORCE 1348 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1349 1350# Modules 1351/: prepare scripts FORCE 1352 $(cmd_crmodverdir) 1353 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1354 $(build)=$(build-dir) 1355%/: prepare scripts FORCE 1356 $(cmd_crmodverdir) 1357 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1358 $(build)=$(build-dir) 1359%.ko: prepare scripts FORCE 1360 $(cmd_crmodverdir) 1361 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1362 $(build)=$(build-dir) $(@:.ko=.o) 1363 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1364 1365# FIXME Should go into a make.lib or something 1366# =========================================================================== 1367 1368quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs))) 1369 cmd_rmdirs = rm -rf $(rm-dirs) 1370 1371quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1372 cmd_rmfiles = rm -f $(rm-files) 1373 1374# Run depmod only if we have System.map and depmod is executable 1375quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) 1376 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1377 $(KERNELRELEASE) 1378 1379# Create temporary dir for module support files 1380# clean it up only when building all modules 1381cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \ 1382 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*) 1383 1384# read all saved command lines 1385 1386targets := $(wildcard $(sort $(targets))) 1387cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd)) 1388 1389ifneq ($(cmd_files),) 1390 $(cmd_files): ; # Do not try to update included dependency files 1391 include $(cmd_files) 1392endif 1393 1394# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir 1395# Usage: 1396# $(Q)$(MAKE) $(clean)=dir 1397clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj 1398 1399endif # skip-makefile 1400 1401PHONY += FORCE 1402FORCE: 1403 1404# Declare the contents of the .PHONY variable as phony. We keep that 1405# information in a variable so we can use it in if_changed and friends. 1406.PHONY: $(PHONY) 1407