1VERSION = 2 2PATCHLEVEL = 6 3SUBLEVEL = 24 4EXTRAVERSION = -rc2 5NAME = Arr Matey! A Hairy Bilge Rat! 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 avoid hard-to-debug behavour); 16# o print "Entering directory ..."; 17MAKEFLAGS += -rR --no-print-directory 18 19# We are using a recursive build, so we need to do a little thinking 20# to get the ordering right. 21# 22# Most importantly: sub-Makefiles should only ever modify files in 23# their own directory. If in some directory we have a dependency on 24# a file in another dir (which doesn't happen often, but it's often 25# unavoidable when linking the built-in.o targets which finally 26# turn into vmlinux), we will call a sub make in that other dir, and 27# after that we are sure that everything which is in that other dir 28# is now up to date. 29# 30# The only cases where we need to modify files which have global 31# effects are thus separated out and done before the recursive 32# descending is started. They are now explicitly listed as the 33# prepare rule. 34 35# To put more focus on warnings, be less verbose as default 36# Use 'make V=1' to see the full commands 37 38ifdef V 39 ifeq ("$(origin V)", "command line") 40 KBUILD_VERBOSE = $(V) 41 endif 42endif 43ifndef KBUILD_VERBOSE 44 KBUILD_VERBOSE = 0 45endif 46 47# Call a source code checker (by default, "sparse") as part of the 48# C compilation. 49# 50# Use 'make C=1' to enable checking of only re-compiled files. 51# Use 'make C=2' to enable checking of *all* source files, regardless 52# of whether they are re-compiled or not. 53# 54# See the file "Documentation/sparse.txt" for more details, including 55# where to get the "sparse" utility. 56 57ifdef C 58 ifeq ("$(origin C)", "command line") 59 KBUILD_CHECKSRC = $(C) 60 endif 61endif 62ifndef KBUILD_CHECKSRC 63 KBUILD_CHECKSRC = 0 64endif 65 66# Use make M=dir to specify directory of external module to build 67# Old syntax make ... SUBDIRS=$PWD is still supported 68# Setting the environment variable KBUILD_EXTMOD take precedence 69ifdef SUBDIRS 70 KBUILD_EXTMOD ?= $(SUBDIRS) 71endif 72ifdef M 73 ifeq ("$(origin M)", "command line") 74 KBUILD_EXTMOD := $(M) 75 endif 76endif 77 78 79# kbuild supports saving output files in a separate directory. 80# To locate output files in a separate directory two syntaxes are supported. 81# In both cases the working directory must be the root of the kernel src. 82# 1) O= 83# Use "make O=dir/to/store/output/files/" 84# 85# 2) Set KBUILD_OUTPUT 86# Set the environment variable KBUILD_OUTPUT to point to the directory 87# where the output files shall be placed. 88# export KBUILD_OUTPUT=dir/to/store/output/files/ 89# make 90# 91# The O= assignment takes precedence over the KBUILD_OUTPUT environment 92# variable. 93 94 95# KBUILD_SRC is set on invocation of make in OBJ directory 96# KBUILD_SRC is not intended to be used by the regular user (for now) 97ifeq ($(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? 101ifdef O 102 ifeq ("$(origin O)", "command line") 103 KBUILD_OUTPUT := $(O) 104 endif 105endif 106 107# That's our default target when none is given on the command line 108PHONY := _all 109_all: 110 111ifneq ($(KBUILD_OUTPUT),) 112# Invoke a second make in the output directory, passing relevant variables 113# check that the output directory actually exists 114saved-output := $(KBUILD_OUTPUT) 115KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd) 116$(if $(KBUILD_OUTPUT),, \ 117 $(error output directory "$(saved-output)" does not exist)) 118# Check that OUTPUT directory is not the same as where we have kernel src 119$(if $(filter-out $(KBUILD_OUTPUT),$(shell /bin/pwd)),, \ 120 $(error Output directory (O=...) specifies kernel src dir)) 121 122PHONY += $(MAKECMDGOALS) sub-make 123 124$(filter-out _all sub-make,$(MAKECMDGOALS)) _all: sub-make 125 $(Q)@: 126 127sub-make: FORCE 128 $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \ 129 KBUILD_SRC=$(CURDIR) \ 130 KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \ 131 $(filter-out _all sub-make,$(MAKECMDGOALS)) 132 133# Leave processing to above invocation of make 134skip-makefile := 1 135endif # ifneq ($(KBUILD_OUTPUT),) 136endif # ifeq ($(KBUILD_SRC),) 137 138# We process the rest of the Makefile if this is the final invocation of make 139ifeq ($(skip-makefile),) 140 141# If building an external module we do not care about the all: rule 142# but instead _all depend on modules 143PHONY += all 144ifeq ($(KBUILD_EXTMOD),) 145_all: all 146else 147_all: modules 148endif 149 150srctree := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR)) 151TOPDIR := $(srctree) 152# FIXME - TOPDIR is obsolete, use srctree/objtree 153objtree := $(CURDIR) 154src := $(srctree) 155obj := $(objtree) 156 157VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD)) 158 159export srctree objtree VPATH TOPDIR 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# Default value for CROSS_COMPILE is not to prefix executables 191# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 192 193ARCH ?= $(SUBARCH) 194CROSS_COMPILE ?= 195 196# Architecture as present in compile.h 197UTS_MACHINE := $(ARCH) 198SRCARCH := $(ARCH) 199 200# for i386 and x86_64 we use SRCARCH equal to x86 201SRCARCH := $(if $(filter x86_64 i386,$(SRCARCH)),x86,$(SRCARCH)) 202 203KCONFIG_CONFIG ?= .config 204 205# SHELL used by kbuild 206CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \ 207 else if [ -x /bin/bash ]; then echo /bin/bash; \ 208 else echo sh; fi ; fi) 209 210HOSTCC = gcc 211HOSTCXX = g++ 212HOSTCFLAGS = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer 213HOSTCXXFLAGS = -O2 214 215# Decide whether to build built-in, modular, or both. 216# Normally, just do built-in. 217 218KBUILD_MODULES := 219KBUILD_BUILTIN := 1 220 221# If we have only "make modules", don't compile built-in objects. 222# When we're building modules with modversions, we need to consider 223# the built-in objects during the descend as well, in order to 224# make sure the checksums are up to date before we record them. 225 226ifeq ($(MAKECMDGOALS),modules) 227 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1) 228endif 229 230# If we have "make <whatever> modules", compile modules 231# in addition to whatever we do anyway. 232# Just "make" or "make all" shall build modules as well 233 234ifneq ($(filter all _all modules,$(MAKECMDGOALS)),) 235 KBUILD_MODULES := 1 236endif 237 238ifeq ($(MAKECMDGOALS),) 239 KBUILD_MODULES := 1 240endif 241 242export KBUILD_MODULES KBUILD_BUILTIN 243export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD 244 245# Beautify output 246# --------------------------------------------------------------------------- 247# 248# Normally, we echo the whole command before executing it. By making 249# that echo $($(quiet)$(cmd)), we now have the possibility to set 250# $(quiet) to choose other forms of output instead, e.g. 251# 252# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@ 253# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< 254# 255# If $(quiet) is empty, the whole command will be printed. 256# If it is set to "quiet_", only the short version will be printed. 257# If it is set to "silent_", nothing will be printed at all, since 258# the variable $(silent_cmd_cc_o_c) doesn't exist. 259# 260# A simple variant is to prefix commands with $(Q) - that's useful 261# for commands that shall be hidden in non-verbose mode. 262# 263# $(Q)ln $@ :< 264# 265# If KBUILD_VERBOSE equals 0 then the above command will be hidden. 266# If KBUILD_VERBOSE equals 1 then the above command is displayed. 267 268ifeq ($(KBUILD_VERBOSE),1) 269 quiet = 270 Q = 271else 272 quiet=quiet_ 273 Q = @ 274endif 275 276# If the user is running make -s (silent mode), suppress echoing of 277# commands 278 279ifneq ($(findstring s,$(MAKEFLAGS)),) 280 quiet=silent_ 281endif 282 283export quiet Q KBUILD_VERBOSE 284 285 286# Look for make include files relative to root of kernel src 287MAKEFLAGS += --include-dir=$(srctree) 288 289# We need some generic definitions. 290include $(srctree)/scripts/Kbuild.include 291 292# Make variables (CC, etc...) 293 294AS = $(CROSS_COMPILE)as 295LD = $(CROSS_COMPILE)ld 296CC = $(CROSS_COMPILE)gcc 297CPP = $(CC) -E 298AR = $(CROSS_COMPILE)ar 299NM = $(CROSS_COMPILE)nm 300STRIP = $(CROSS_COMPILE)strip 301OBJCOPY = $(CROSS_COMPILE)objcopy 302OBJDUMP = $(CROSS_COMPILE)objdump 303AWK = awk 304GENKSYMS = scripts/genksyms/genksyms 305DEPMOD = /sbin/depmod 306KALLSYMS = scripts/kallsyms 307PERL = perl 308CHECK = sparse 309 310CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ -Wbitwise $(CF) 311MODFLAGS = -DMODULE 312CFLAGS_MODULE = $(MODFLAGS) 313AFLAGS_MODULE = $(MODFLAGS) 314LDFLAGS_MODULE = 315CFLAGS_KERNEL = 316AFLAGS_KERNEL = 317 318 319# Use LINUXINCLUDE when you must reference the include/ directory. 320# Needed to be compatible with the O= option 321LINUXINCLUDE := -Iinclude \ 322 $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include) \ 323 -include include/linux/autoconf.h 324 325KBUILD_CPPFLAGS := -D__KERNEL__ $(LINUXINCLUDE) 326 327KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \ 328 -fno-strict-aliasing -fno-common \ 329 -Werror-implicit-function-declaration 330KBUILD_AFLAGS := -D__ASSEMBLY__ 331 332# Read KERNELRELEASE from include/config/kernel.release (if it exists) 333KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null) 334KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION) 335 336export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 337export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC 338export CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE 339export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS 340 341export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS 342export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 343export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 344 345# When compiling out-of-tree modules, put MODVERDIR in the module 346# tree rather than in the kernel tree. The kernel tree might 347# even be read-only. 348export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions 349 350# Files to ignore in find ... statements 351 352RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS -o -name .pc -o -name .hg -o -name .git \) -prune -o 353export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git 354 355# =========================================================================== 356# Rules shared between *config targets and build targets 357 358# Basic helpers built in scripts/ 359PHONY += scripts_basic 360scripts_basic: 361 $(Q)$(MAKE) $(build)=scripts/basic 362 363# To avoid any implicit rule to kick in, define an empty command. 364scripts/basic/%: scripts_basic ; 365 366PHONY += outputmakefile 367# outputmakefile generates a Makefile in the output directory, if using a 368# separate output directory. This allows convenient use of make in the 369# output directory. 370outputmakefile: 371ifneq ($(KBUILD_SRC),) 372 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \ 373 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL) 374endif 375 376# To make sure we do not include .config for any of the *config targets 377# catch them early, and hand them over to scripts/kconfig/Makefile 378# It is allowed to specify more targets when calling make, including 379# mixing *config targets and build targets. 380# For example 'make oldconfig all'. 381# Detect when mixed targets is specified, and make a second invocation 382# of make so .config is not included in this case either (for *config). 383 384no-dot-config-targets := clean mrproper distclean \ 385 cscope TAGS tags help %docs check% \ 386 include/linux/version.h headers_% \ 387 kernelrelease kernelversion 388 389config-targets := 0 390mixed-targets := 0 391dot-config := 1 392 393ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 394 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 395 dot-config := 0 396 endif 397endif 398 399ifeq ($(KBUILD_EXTMOD),) 400 ifneq ($(filter config %config,$(MAKECMDGOALS)),) 401 config-targets := 1 402 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),) 403 mixed-targets := 1 404 endif 405 endif 406endif 407 408ifeq ($(mixed-targets),1) 409# =========================================================================== 410# We're called with mixed targets (*config and build targets). 411# Handle them one by one. 412 413%:: FORCE 414 $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@ 415 416else 417ifeq ($(config-targets),1) 418# =========================================================================== 419# *config targets only - make sure prerequisites are updated, and descend 420# in scripts/kconfig to make the *config target 421 422# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 423# KBUILD_DEFCONFIG may point out an alternative default configuration 424# used for 'make defconfig' 425include $(srctree)/arch/$(SRCARCH)/Makefile 426export KBUILD_DEFCONFIG 427 428config %config: scripts_basic outputmakefile FORCE 429 $(Q)mkdir -p include/linux include/config 430 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 431 432else 433# =========================================================================== 434# Build targets only - this includes vmlinux, arch specific targets, clean 435# targets and others. In general all targets except *config targets. 436 437ifeq ($(KBUILD_EXTMOD),) 438# Additional helpers built in scripts/ 439# Carefully list dependencies so we do not try to build scripts twice 440# in parallel 441PHONY += scripts 442scripts: scripts_basic include/config/auto.conf 443 $(Q)$(MAKE) $(build)=$(@) 444 445# Objects we will link into vmlinux / subdirs we need to visit 446init-y := init/ 447drivers-y := drivers/ sound/ 448net-y := net/ 449libs-y := lib/ 450core-y := usr/ 451endif # KBUILD_EXTMOD 452 453ifeq ($(dot-config),1) 454# Read in config 455-include include/config/auto.conf 456 457ifeq ($(KBUILD_EXTMOD),) 458# Read in dependencies to all Kconfig* files, make sure to run 459# oldconfig if changes are detected. 460-include include/config/auto.conf.cmd 461 462# To avoid any implicit rule to kick in, define an empty command 463$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ; 464 465# If .config is newer than include/config/auto.conf, someone tinkered 466# with it and forgot to run make oldconfig. 467# if auto.conf.cmd is missing then we are probably in a cleaned tree so 468# we execute the config step to be sure to catch updated Kconfig files 469include/config/auto.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd 470 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig 471else 472# external modules needs include/linux/autoconf.h and include/config/auto.conf 473# but do not care if they are up-to-date. Use auto.conf to trigger the test 474PHONY += include/config/auto.conf 475 476include/config/auto.conf: 477 $(Q)test -e include/linux/autoconf.h -a -e $@ || ( \ 478 echo; \ 479 echo " ERROR: Kernel configuration is invalid."; \ 480 echo " include/linux/autoconf.h or $@ are missing."; \ 481 echo " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 482 echo; \ 483 /bin/false) 484 485endif # KBUILD_EXTMOD 486 487else 488# Dummy target needed, because used as prerequisite 489include/config/auto.conf: ; 490endif # $(dot-config) 491 492# The all: target is the default when no target is given on the 493# command line. 494# This allow a user to issue only 'make' to build a kernel including modules 495# Defaults vmlinux but it is usually overridden in the arch makefile 496all: vmlinux 497 498ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 499KBUILD_CFLAGS += -Os 500else 501KBUILD_CFLAGS += -O2 502endif 503 504include $(srctree)/arch/$(SRCARCH)/Makefile 505 506ifdef CONFIG_FRAME_POINTER 507KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 508else 509KBUILD_CFLAGS += -fomit-frame-pointer 510endif 511 512ifdef CONFIG_DEBUG_INFO 513KBUILD_CFLAGS += -g 514KBUILD_AFLAGS += -gdwarf-2 515endif 516 517# Force gcc to behave correct even for buggy distributions 518KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector) 519 520# arch Makefile may override CC so keep this after arch Makefile is included 521NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) 522CHECKFLAGS += $(NOSTDINC_FLAGS) 523 524# warn about C99 declaration after statement 525KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,) 526 527# disable pointer signed / unsigned warnings in gcc 4.0 528KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,) 529 530# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments 531# But warn user when we do so 532warn-assign = \ 533$(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)") 534 535ifneq ($(KCPPFLAGS),) 536 $(call warn-assign,CPPFLAGS) 537 KBUILD_CPPFLAGS += $(KCPPFLAGS) 538endif 539ifneq ($(KAFLAGS),) 540 $(call warn-assign,AFLAGS) 541 KBUILD_AFLAGS += $(KAFLAGS) 542endif 543ifneq ($(KCFLAGS),) 544 $(call warn-assign,CFLAGS) 545 KBUILD_CFLAGS += $(KCFLAGS) 546endif 547 548# Use --build-id when available. 549LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\ 550 $(call ld-option, -Wl$(comma)--build-id,)) 551LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID) 552LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID) 553 554# Default kernel image to build when no specific target is given. 555# KBUILD_IMAGE may be overruled on the command line or 556# set in the environment 557# Also any assignments in arch/$(ARCH)/Makefile take precedence over 558# this default value 559export KBUILD_IMAGE ?= vmlinux 560 561# 562# INSTALL_PATH specifies where to place the updated kernel and system map 563# images. Default is /boot, but you can set it to other values 564export INSTALL_PATH ?= /boot 565 566# 567# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 568# relocations required by build roots. This is not defined in the 569# makefile but the argument can be passed to make if needed. 570# 571 572MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 573export MODLIB 574 575# 576# INSTALL_MOD_STRIP, if defined, will cause modules to be 577# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then 578# the default option --strip-debug will be used. Otherwise, 579# INSTALL_MOD_STRIP will used as the options to the strip command. 580 581ifdef INSTALL_MOD_STRIP 582ifeq ($(INSTALL_MOD_STRIP),1) 583mod_strip_cmd = $(STRIP) --strip-debug 584else 585mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP) 586endif # INSTALL_MOD_STRIP=1 587else 588mod_strip_cmd = true 589endif # INSTALL_MOD_STRIP 590export mod_strip_cmd 591 592 593ifeq ($(KBUILD_EXTMOD),) 594core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/ 595 596vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \ 597 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 598 $(net-y) $(net-m) $(libs-y) $(libs-m))) 599 600vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \ 601 $(init-n) $(init-) \ 602 $(core-n) $(core-) $(drivers-n) $(drivers-) \ 603 $(net-n) $(net-) $(libs-n) $(libs-)))) 604 605init-y := $(patsubst %/, %/built-in.o, $(init-y)) 606core-y := $(patsubst %/, %/built-in.o, $(core-y)) 607drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y)) 608net-y := $(patsubst %/, %/built-in.o, $(net-y)) 609libs-y1 := $(patsubst %/, %/lib.a, $(libs-y)) 610libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y)) 611libs-y := $(libs-y1) $(libs-y2) 612 613# Build vmlinux 614# --------------------------------------------------------------------------- 615# vmlinux is built from the objects selected by $(vmlinux-init) and 616# $(vmlinux-main). Most are built-in.o files from top-level directories 617# in the kernel tree, others are specified in arch/$(ARCH)/Makefile. 618# Ordering when linking is important, and $(vmlinux-init) must be first. 619# 620# vmlinux 621# ^ 622# | 623# +-< $(vmlinux-init) 624# | +--< init/version.o + more 625# | 626# +--< $(vmlinux-main) 627# | +--< driver/built-in.o mm/built-in.o + more 628# | 629# +-< kallsyms.o (see description in CONFIG_KALLSYMS section) 630# 631# vmlinux version (uname -v) cannot be updated during normal 632# descending-into-subdirs phase since we do not yet know if we need to 633# update vmlinux. 634# Therefore this step is delayed until just before final link of vmlinux - 635# except in the kallsyms case where it is done just before adding the 636# symbols to the kernel. 637# 638# System.map is generated to document addresses of all kernel symbols 639 640vmlinux-init := $(head-y) $(init-y) 641vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y) 642vmlinux-all := $(vmlinux-init) $(vmlinux-main) 643vmlinux-lds := arch/$(SRCARCH)/kernel/vmlinux.lds 644export KBUILD_VMLINUX_OBJS := $(vmlinux-all) 645 646# Rule to link vmlinux - also used during CONFIG_KALLSYMS 647# May be overridden by arch/$(ARCH)/Makefile 648quiet_cmd_vmlinux__ ?= LD $@ 649 cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \ 650 -T $(vmlinux-lds) $(vmlinux-init) \ 651 --start-group $(vmlinux-main) --end-group \ 652 $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^) 653 654# Generate new vmlinux version 655quiet_cmd_vmlinux_version = GEN .version 656 cmd_vmlinux_version = set -e; \ 657 if [ ! -r .version ]; then \ 658 rm -f .version; \ 659 echo 1 >.version; \ 660 else \ 661 mv .version .old_version; \ 662 expr 0$$(cat .old_version) + 1 >.version; \ 663 fi; \ 664 $(MAKE) $(build)=init 665 666# Generate System.map 667quiet_cmd_sysmap = SYSMAP 668 cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap 669 670# Link of vmlinux 671# If CONFIG_KALLSYMS is set .version is already updated 672# Generate System.map and verify that the content is consistent 673# Use + in front of the vmlinux_version rule to silent warning with make -j2 674# First command is ':' to allow us to use + in front of the rule 675define rule_vmlinux__ 676 : 677 $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version)) 678 679 $(call cmd,vmlinux__) 680 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd 681 682 $(Q)$(if $($(quiet)cmd_sysmap), \ 683 echo ' $($(quiet)cmd_sysmap) System.map' &&) \ 684 $(cmd_sysmap) $@ System.map; \ 685 if [ $$? -ne 0 ]; then \ 686 rm -f $@; \ 687 /bin/false; \ 688 fi; 689 $(verify_kallsyms) 690endef 691 692 693ifdef CONFIG_KALLSYMS 694# Generate section listing all symbols and add it into vmlinux $(kallsyms.o) 695# It's a three stage process: 696# o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is 697# empty 698# Running kallsyms on that gives us .tmp_kallsyms1.o with 699# the right size - vmlinux version (uname -v) is updated during this step 700# o .tmp_vmlinux2 now has a __kallsyms section of the right size, 701# but due to the added section, some addresses have shifted. 702# From here, we generate a correct .tmp_kallsyms2.o 703# o The correct .tmp_kallsyms2.o is linked into the final vmlinux. 704# o Verify that the System.map from vmlinux matches the map from 705# .tmp_vmlinux2, just in case we did not generate kallsyms correctly. 706# o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using 707# .tmp_vmlinux3 and .tmp_kallsyms3.o. This is only meant as a 708# temporary bypass to allow the kernel to be built while the 709# maintainers work out what went wrong with kallsyms. 710 711ifdef CONFIG_KALLSYMS_EXTRA_PASS 712last_kallsyms := 3 713else 714last_kallsyms := 2 715endif 716 717kallsyms.o := .tmp_kallsyms$(last_kallsyms).o 718 719define verify_kallsyms 720 $(Q)$(if $($(quiet)cmd_sysmap), \ 721 echo ' $($(quiet)cmd_sysmap) .tmp_System.map' &&) \ 722 $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map 723 $(Q)cmp -s System.map .tmp_System.map || \ 724 (echo Inconsistent kallsyms data; \ 725 echo Try setting CONFIG_KALLSYMS_EXTRA_PASS; \ 726 rm .tmp_kallsyms* ; /bin/false ) 727endef 728 729# Update vmlinux version before link 730# Use + in front of this rule to silent warning about make -j1 731# First command is ':' to allow us to use + in front of this rule 732cmd_ksym_ld = $(cmd_vmlinux__) 733define rule_ksym_ld 734 : 735 +$(call cmd,vmlinux_version) 736 $(call cmd,vmlinux__) 737 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd 738endef 739 740# Generate .S file with all kernel symbols 741quiet_cmd_kallsyms = KSYM $@ 742 cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \ 743 $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@ 744 745.tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE 746 $(call if_changed_dep,as_o_S) 747 748.tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS) 749 $(call cmd,kallsyms) 750 751# .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version 752.tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE 753 $(call if_changed_rule,ksym_ld) 754 755.tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE 756 $(call if_changed,vmlinux__) 757 758.tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE 759 $(call if_changed,vmlinux__) 760 761# Needs to visit scripts/ before $(KALLSYMS) can be used. 762$(KALLSYMS): scripts ; 763 764# Generate some data for debugging strange kallsyms problems 765debug_kallsyms: .tmp_map$(last_kallsyms) 766 767.tmp_map%: .tmp_vmlinux% FORCE 768 ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@ 769 770.tmp_map3: .tmp_map2 771 772.tmp_map2: .tmp_map1 773 774endif # ifdef CONFIG_KALLSYMS 775 776# Do modpost on a prelinked vmlinux. The finally linked vmlinux has 777# relevant sections renamed as per the linker script. 778quiet_cmd_vmlinux-modpost = LD $@ 779 cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@ \ 780 $(vmlinux-init) --start-group $(vmlinux-main) --end-group \ 781 $(filter-out $(vmlinux-init) $(vmlinux-main) $(vmlinux-lds) FORCE ,$^) 782define rule_vmlinux-modpost 783 : 784 +$(call cmd,vmlinux-modpost) 785 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@ 786 $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd 787endef 788 789# vmlinux image - including updated kernel symbols 790vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) $(kallsyms.o) vmlinux.o FORCE 791ifdef CONFIG_HEADERS_CHECK 792 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check 793endif 794ifdef CONFIG_SAMPLES 795 $(Q)$(MAKE) $(build)=samples 796endif 797 $(call vmlinux-modpost) 798 $(call if_changed_rule,vmlinux__) 799 $(Q)rm -f .old_version 800 801vmlinux.o: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) $(kallsyms.o) FORCE 802 $(call if_changed_rule,vmlinux-modpost) 803 804# The actual objects are generated when descending, 805# make sure no implicit rule kicks in 806$(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ; 807 808# Handle descending into subdirectories listed in $(vmlinux-dirs) 809# Preset locale variables to speed up the build process. Limit locale 810# tweaks to this spot to avoid wrong language settings when running 811# make menuconfig etc. 812# Error messages still appears in the original language 813 814PHONY += $(vmlinux-dirs) 815$(vmlinux-dirs): prepare scripts 816 $(Q)$(MAKE) $(build)=$@ 817 818# Build the kernel release string 819# 820# The KERNELRELEASE value built here is stored in the file 821# include/config/kernel.release, and is used when executing several 822# make targets, such as "make install" or "make modules_install." 823# 824# The eventual kernel release string consists of the following fields, 825# shown in a hierarchical format to show how smaller parts are concatenated 826# to form the larger and final value, with values coming from places like 827# the Makefile, kernel config options, make command line options and/or 828# SCM tag information. 829# 830# $(KERNELVERSION) 831# $(VERSION) eg, 2 832# $(PATCHLEVEL) eg, 6 833# $(SUBLEVEL) eg, 18 834# $(EXTRAVERSION) eg, -rc6 835# $(localver-full) 836# $(localver) 837# localversion* (files without backups, containing '~') 838# $(CONFIG_LOCALVERSION) (from kernel config setting) 839# $(localver-auto) (only if CONFIG_LOCALVERSION_AUTO is set) 840# ./scripts/setlocalversion (SCM tag, if one exists) 841# $(LOCALVERSION) (from make command line if provided) 842# 843# Note how the final $(localver-auto) string is included *only* if the 844# kernel config option CONFIG_LOCALVERSION_AUTO is selected. Also, at the 845# moment, only git is supported but other SCMs can edit the script 846# scripts/setlocalversion and add the appropriate checks as needed. 847 848pattern = ".*/localversion[^~]*" 849string = $(shell cat /dev/null \ 850 `find $(objtree) $(srctree) -maxdepth 1 -regex $(pattern) | sort -u`) 851 852localver = $(subst $(space),, $(string) \ 853 $(patsubst "%",%,$(CONFIG_LOCALVERSION))) 854 855# If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called 856# and if the SCM is know a tag from the SCM is appended. 857# The appended tag is determined by the SCM used. 858# 859# Currently, only git is supported. 860# Other SCMs can edit scripts/setlocalversion and add the appropriate 861# checks as needed. 862ifdef CONFIG_LOCALVERSION_AUTO 863 _localver-auto = $(shell $(CONFIG_SHELL) \ 864 $(srctree)/scripts/setlocalversion $(srctree)) 865 localver-auto = $(LOCALVERSION)$(_localver-auto) 866endif 867 868localver-full = $(localver)$(localver-auto) 869 870# Store (new) KERNELRELASE string in include/config/kernel.release 871kernelrelease = $(KERNELVERSION)$(localver-full) 872include/config/kernel.release: include/config/auto.conf FORCE 873 $(Q)rm -f $@ 874 $(Q)echo $(kernelrelease) > $@ 875 876 877# Things we need to do before we recursively start building the kernel 878# or the modules are listed in "prepare". 879# A multi level approach is used. prepareN is processed before prepareN-1. 880# archprepare is used in arch Makefiles and when processed asm symlink, 881# version.h and scripts_basic is processed / created. 882 883# Listed in dependency order 884PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3 885 886# prepare3 is used to check if we are building in a separate output directory, 887# and if so do: 888# 1) Check that make has not been executed in the kernel src $(srctree) 889# 2) Create the include2 directory, used for the second asm symlink 890prepare3: include/config/kernel.release 891ifneq ($(KBUILD_SRC),) 892 @echo ' Using $(srctree) as source for kernel' 893 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \ 894 echo " $(srctree) is not clean, please run 'make mrproper'";\ 895 echo " in the '$(srctree)' directory.";\ 896 /bin/false; \ 897 fi; 898 $(Q)if [ ! -d include2 ]; then mkdir -p include2; fi; 899 $(Q)ln -fsn $(srctree)/include/asm-$(SRCARCH) include2/asm 900endif 901 902# prepare2 creates a makefile if using a separate output directory 903prepare2: prepare3 outputmakefile 904 905prepare1: prepare2 include/linux/version.h include/linux/utsrelease.h \ 906 include/asm include/config/auto.conf 907 $(cmd_crmodverdir) 908 909archprepare: prepare1 scripts_basic 910 911prepare0: archprepare FORCE 912 $(Q)$(MAKE) $(build)=. 913 $(Q)$(MAKE) $(build)=. missing-syscalls 914 915# All the preparing.. 916prepare: prepare0 917 918# Leave this as default for preprocessing vmlinux.lds.S, which is now 919# done in arch/$(ARCH)/kernel/Makefile 920 921export CPPFLAGS_vmlinux.lds += -P -C -U$(ARCH) 922 923# The asm symlink changes when $(ARCH) changes. 924# Detect this and ask user to run make mrproper 925 926include/asm: FORCE 927 $(Q)set -e; asmlink=`readlink include/asm | cut -d '-' -f 2`; \ 928 if [ -L include/asm ]; then \ 929 if [ "$$asmlink" != "$(SRCARCH)" ]; then \ 930 echo "ERROR: the symlink $@ points to asm-$$asmlink but asm-$(SRCARCH) was expected"; \ 931 echo " set ARCH or save .config and run 'make mrproper' to fix it"; \ 932 exit 1; \ 933 fi; \ 934 else \ 935 echo ' SYMLINK $@ -> include/asm-$(SRCARCH)'; \ 936 if [ ! -d include ]; then \ 937 mkdir -p include; \ 938 fi; \ 939 ln -fsn asm-$(SRCARCH) $@; \ 940 fi 941 942# Generate some files 943# --------------------------------------------------------------------------- 944 945# KERNELRELEASE can change from a few different places, meaning version.h 946# needs to be updated, so this check is forced on all builds 947 948uts_len := 64 949define filechk_utsrelease.h 950 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 951 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 952 exit 1; \ 953 fi; \ 954 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";) 955endef 956 957define filechk_version.h 958 (echo \#define LINUX_VERSION_CODE $(shell \ 959 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \ 960 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';) 961endef 962 963include/linux/version.h: $(srctree)/Makefile FORCE 964 $(call filechk,version.h) 965 966include/linux/utsrelease.h: include/config/kernel.release FORCE 967 $(call filechk,utsrelease.h) 968 969# --------------------------------------------------------------------------- 970 971PHONY += depend dep 972depend dep: 973 @echo '*** Warning: make $@ is unnecessary now.' 974 975# --------------------------------------------------------------------------- 976# Kernel headers 977INSTALL_HDR_PATH=$(objtree)/usr 978export INSTALL_HDR_PATH 979 980HDRFILTER=generic i386 x86_64 981HDRARCHES=$(filter-out $(HDRFILTER),$(patsubst $(srctree)/include/asm-%/Kbuild,%,$(wildcard $(srctree)/include/asm-*/Kbuild))) 982 983PHONY += headers_install_all 984headers_install_all: include/linux/version.h scripts_basic FORCE 985 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 986 $(Q)for arch in $(HDRARCHES); do \ 987 $(MAKE) ARCH=$$arch -f $(srctree)/scripts/Makefile.headersinst obj=include BIASMDIR=-bi-$$arch ;\ 988 done 989 990PHONY += headers_install 991headers_install: include/linux/version.h scripts_basic FORCE 992 @if [ ! -r $(srctree)/include/asm-$(SRCARCH)/Kbuild ]; then \ 993 echo '*** Error: Headers not exportable for this architecture ($(SRCARCH))'; \ 994 exit 1 ; fi 995 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 996 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.headersinst ARCH=$(SRCARCH) obj=include 997 998PHONY += headers_check_all 999headers_check_all: headers_install_all 1000 $(Q)for arch in $(HDRARCHES); do \ 1001 $(MAKE) ARCH=$$arch -f $(srctree)/scripts/Makefile.headersinst obj=include BIASMDIR=-bi-$$arch HDRCHECK=1 ;\ 1002 done 1003 1004PHONY += headers_check 1005headers_check: headers_install 1006 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.headersinst ARCH=$(SRCARCH) obj=include HDRCHECK=1 1007 1008# --------------------------------------------------------------------------- 1009# Modules 1010 1011ifdef CONFIG_MODULES 1012 1013# By default, build modules as well 1014 1015all: modules 1016 1017# Build modules 1018 1019PHONY += modules 1020modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) 1021 @echo ' Building modules, stage 2.'; 1022 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1023 1024 1025# Target to prepare building external modules 1026PHONY += modules_prepare 1027modules_prepare: prepare scripts 1028 1029# Target to install modules 1030PHONY += modules_install 1031modules_install: _modinst_ _modinst_post 1032 1033PHONY += _modinst_ 1034_modinst_: 1035 @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \ 1036 echo "Warning: you may need to install module-init-tools"; \ 1037 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\ 1038 sleep 1; \ 1039 fi 1040 @rm -rf $(MODLIB)/kernel 1041 @rm -f $(MODLIB)/source 1042 @mkdir -p $(MODLIB)/kernel 1043 @ln -s $(srctree) $(MODLIB)/source 1044 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1045 rm -f $(MODLIB)/build ; \ 1046 ln -s $(objtree) $(MODLIB)/build ; \ 1047 fi 1048 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1049 1050# This depmod is only for convenience to give the initial 1051# boot a modules.dep even before / is mounted read-write. However the 1052# boot script depmod is the master version. 1053PHONY += _modinst_post 1054_modinst_post: _modinst_ 1055 $(call cmd,depmod) 1056 1057else # CONFIG_MODULES 1058 1059# Modules not configured 1060# --------------------------------------------------------------------------- 1061 1062modules modules_install: FORCE 1063 @echo 1064 @echo "The present kernel configuration has modules disabled." 1065 @echo "Type 'make config' and enable loadable module support." 1066 @echo "Then build a kernel with module support enabled." 1067 @echo 1068 @exit 1 1069 1070endif # CONFIG_MODULES 1071 1072### 1073# Cleaning is done on three levels. 1074# make clean Delete most generated files 1075# Leave enough to build external modules 1076# make mrproper Delete the current configuration, and all generated files 1077# make distclean Remove editor backup files, patch leftover files and the like 1078 1079# Directories & files removed with 'make clean' 1080CLEAN_DIRS += $(MODVERDIR) 1081CLEAN_FILES += vmlinux System.map \ 1082 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map 1083 1084# Directories & files removed with 'make mrproper' 1085MRPROPER_DIRS += include/config include2 usr/include 1086MRPROPER_FILES += .config .config.old include/asm .version .old_version \ 1087 include/linux/autoconf.h include/linux/version.h \ 1088 include/linux/utsrelease.h \ 1089 Module.symvers tags TAGS cscope* 1090 1091# clean - Delete most, but leave enough to build external modules 1092# 1093clean: rm-dirs := $(CLEAN_DIRS) 1094clean: rm-files := $(CLEAN_FILES) 1095clean-dirs := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs)) 1096 1097PHONY += $(clean-dirs) clean archclean 1098$(clean-dirs): 1099 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1100 1101clean: archclean $(clean-dirs) 1102 $(call cmd,rmdirs) 1103 $(call cmd,rmfiles) 1104 @find . $(RCS_FIND_IGNORE) \ 1105 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \ 1106 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1107 -o -name '*.symtypes' \) \ 1108 -type f -print | xargs rm -f 1109 1110# mrproper - Delete all generated files, including .config 1111# 1112mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS)) 1113mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1114mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts) 1115 1116PHONY += $(mrproper-dirs) mrproper archmrproper 1117$(mrproper-dirs): 1118 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1119 1120mrproper: clean archmrproper $(mrproper-dirs) 1121 $(call cmd,rmdirs) 1122 $(call cmd,rmfiles) 1123 1124# distclean 1125# 1126PHONY += distclean 1127 1128distclean: mrproper 1129 @find $(srctree) $(RCS_FIND_IGNORE) \ 1130 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1131 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \ 1132 -o -name '.*.rej' -o -size 0 \ 1133 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \ 1134 -type f -print | xargs rm -f 1135 1136 1137# Packaging of the kernel to various formats 1138# --------------------------------------------------------------------------- 1139# rpm target kept for backward compatibility 1140package-dir := $(srctree)/scripts/package 1141 1142%pkg: include/config/kernel.release FORCE 1143 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1144rpm: include/config/kernel.release FORCE 1145 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1146 1147 1148# Brief documentation of the typical targets used 1149# --------------------------------------------------------------------------- 1150 1151boards := $(wildcard $(srctree)/arch/$(ARCH)/configs/*_defconfig) 1152boards := $(notdir $(boards)) 1153 1154help: 1155 @echo 'Cleaning targets:' 1156 @echo ' clean - Remove most generated files but keep the config and' 1157 @echo ' enough build support to build external modules' 1158 @echo ' mrproper - Remove all generated files + config + various backup files' 1159 @echo ' distclean - mrproper + remove editor backup and patch files' 1160 @echo '' 1161 @echo 'Configuration targets:' 1162 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1163 @echo '' 1164 @echo 'Other generic targets:' 1165 @echo ' all - Build all targets marked with [*]' 1166 @echo '* vmlinux - Build the bare kernel' 1167 @echo '* modules - Build all modules' 1168 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1169 @echo ' dir/ - Build all files in dir and below' 1170 @echo ' dir/file.[ois] - Build specified target only' 1171 @echo ' dir/file.ko - Build module including final link' 1172 @echo ' rpm - Build a kernel as an RPM package' 1173 @echo ' tags/TAGS - Generate tags file for editors' 1174 @echo ' cscope - Generate cscope index' 1175 @echo ' kernelrelease - Output the release version string' 1176 @echo ' kernelversion - Output the version stored in Makefile' 1177 @if [ -r $(srctree)/include/asm-$(SRCARCH)/Kbuild ]; then \ 1178 echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1179 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1180 fi 1181 @echo '' 1182 @echo 'Static analysers' 1183 @echo ' checkstack - Generate a list of stack hogs' 1184 @echo ' namespacecheck - Name space analysis on compiled kernel' 1185 @echo ' export_report - List the usages of all exported symbols' 1186 @if [ -r $(srctree)/include/asm-$(SRCARCH)/Kbuild ]; then \ 1187 echo ' headers_check - Sanity check on exported headers'; \ 1188 fi 1189 @echo '' 1190 @echo 'Kernel packaging:' 1191 @$(MAKE) $(build)=$(package-dir) help 1192 @echo '' 1193 @echo 'Documentation targets:' 1194 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp 1195 @echo '' 1196 @echo 'Architecture specific targets ($(ARCH)):' 1197 @$(if $(archhelp),$(archhelp),\ 1198 echo ' No architecture specific help defined for $(ARCH)') 1199 @echo '' 1200 @$(if $(boards), \ 1201 $(foreach b, $(boards), \ 1202 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1203 echo '') 1204 1205 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1206 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1207 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1208 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)' 1209 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1210 @echo '' 1211 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1212 @echo 'For further info see the ./README file' 1213 1214 1215# Documentation targets 1216# --------------------------------------------------------------------------- 1217%docs: scripts_basic FORCE 1218 $(Q)$(MAKE) $(build)=Documentation/DocBook $@ 1219 1220else # KBUILD_EXTMOD 1221 1222### 1223# External module support. 1224# When building external modules the kernel used as basis is considered 1225# read-only, and no consistency checks are made and the make 1226# system is not used on the basis kernel. If updates are required 1227# in the basis kernel ordinary make commands (without M=...) must 1228# be used. 1229# 1230# The following are the only valid targets when building external 1231# modules. 1232# make M=dir clean Delete all automatically generated files 1233# make M=dir modules Make all modules in specified dir 1234# make M=dir Same as 'make M=dir modules' 1235# make M=dir modules_install 1236# Install the modules built in the module directory 1237# Assumes install directory is already created 1238 1239# We are always building modules 1240KBUILD_MODULES := 1 1241PHONY += crmodverdir 1242crmodverdir: 1243 $(cmd_crmodverdir) 1244 1245PHONY += $(objtree)/Module.symvers 1246$(objtree)/Module.symvers: 1247 @test -e $(objtree)/Module.symvers || ( \ 1248 echo; \ 1249 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \ 1250 echo " is missing; modules will have no dependencies and modversions."; \ 1251 echo ) 1252 1253module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD)) 1254PHONY += $(module-dirs) modules 1255$(module-dirs): crmodverdir $(objtree)/Module.symvers 1256 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@) 1257 1258modules: $(module-dirs) 1259 @echo ' Building modules, stage 2.'; 1260 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1261 1262PHONY += modules_install 1263modules_install: _emodinst_ _emodinst_post 1264 1265install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra) 1266PHONY += _emodinst_ 1267_emodinst_: 1268 $(Q)mkdir -p $(MODLIB)/$(install-dir) 1269 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1270 1271PHONY += _emodinst_post 1272_emodinst_post: _emodinst_ 1273 $(call cmd,depmod) 1274 1275clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD)) 1276 1277PHONY += $(clean-dirs) clean 1278$(clean-dirs): 1279 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1280 1281clean: rm-dirs := $(MODVERDIR) 1282clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers 1283clean: $(clean-dirs) 1284 $(call cmd,rmdirs) 1285 $(call cmd,rmfiles) 1286 @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \ 1287 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \ 1288 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \ 1289 -type f -print | xargs rm -f 1290 1291help: 1292 @echo ' Building external modules.' 1293 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1294 @echo '' 1295 @echo ' modules - default target, build the module(s)' 1296 @echo ' modules_install - install the module' 1297 @echo ' clean - remove generated files in module directory only' 1298 @echo '' 1299 1300# Dummies... 1301PHONY += prepare scripts 1302prepare: ; 1303scripts: ; 1304endif # KBUILD_EXTMOD 1305 1306# Generate tags for editors 1307# --------------------------------------------------------------------------- 1308 1309#We want __srctree to totally vanish out when KBUILD_OUTPUT is not set 1310#(which is the most common case IMHO) to avoid unneeded clutter in the big tags file. 1311#Adding $(srctree) adds about 20M on i386 to the size of the output file! 1312 1313ifeq ($(src),$(obj)) 1314__srctree = 1315else 1316__srctree = $(srctree)/ 1317endif 1318 1319ifeq ($(ALLSOURCE_ARCHS),) 1320ifeq ($(ARCH),um) 1321ALLINCLUDE_ARCHS := $(ARCH) $(SUBARCH) 1322else 1323ALLINCLUDE_ARCHS := $(SRCARCH) 1324endif 1325else 1326#Allow user to specify only ALLSOURCE_PATHS on the command line, keeping existing behavour. 1327ALLINCLUDE_ARCHS := $(ALLSOURCE_ARCHS) 1328endif 1329 1330# Take care of arch/x86 1331ifeq ($(ARCH), $(SRCARCH)) 1332ALLSOURCE_ARCHS := $(ARCH) 1333else 1334ALLSOURCE_ARCHS := $(ARCH) $(SRCARCH) 1335endif 1336 1337define find-sources 1338 ( for arch in $(ALLSOURCE_ARCHS) ; do \ 1339 find $(__srctree)arch/$${arch} $(RCS_FIND_IGNORE) \ 1340 -name $1 -print; \ 1341 done ; \ 1342 find $(__srctree)security/selinux/include $(RCS_FIND_IGNORE) \ 1343 -name $1 -print; \ 1344 find $(__srctree)include $(RCS_FIND_IGNORE) \ 1345 \( -name config -o -name 'asm-*' \) -prune \ 1346 -o -name $1 -print; \ 1347 for arch in $(ALLINCLUDE_ARCHS) ; do \ 1348 find $(__srctree)include/asm-$${arch} $(RCS_FIND_IGNORE) \ 1349 -name $1 -print; \ 1350 done ; \ 1351 find $(__srctree)include/asm-generic $(RCS_FIND_IGNORE) \ 1352 -name $1 -print; \ 1353 find $(__srctree) $(RCS_FIND_IGNORE) \ 1354 \( -name include -o -name arch -o -name '.tmp_*' \) -prune -o \ 1355 -name $1 -print; \ 1356 ) 1357endef 1358 1359define all-sources 1360 $(call find-sources,'*.[chS]') 1361endef 1362define all-kconfigs 1363 $(call find-sources,'Kconfig*') 1364endef 1365define all-defconfigs 1366 $(call find-sources,'defconfig') 1367endef 1368 1369define xtags 1370 if $1 --version 2>&1 | grep -iq exuberant; then \ 1371 $(all-sources) | xargs $1 -a \ 1372 -I __initdata,__exitdata,__acquires,__releases \ 1373 -I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL \ 1374 --extra=+f --c-kinds=+px \ 1375 --regex-asm='/^ENTRY\(([^)]*)\).*/\1/'; \ 1376 $(all-kconfigs) | xargs $1 -a \ 1377 --langdef=kconfig \ 1378 --language-force=kconfig \ 1379 --regex-kconfig='/^[[:blank:]]*config[[:blank:]]+([[:alnum:]_]+)/\1/'; \ 1380 $(all-defconfigs) | xargs -r $1 -a \ 1381 --langdef=dotconfig \ 1382 --language-force=dotconfig \ 1383 --regex-dotconfig='/^#?[[:blank:]]*(CONFIG_[[:alnum:]_]+)/\1/'; \ 1384 elif $1 --version 2>&1 | grep -iq emacs; then \ 1385 $(all-sources) | xargs $1 -a; \ 1386 $(all-kconfigs) | xargs $1 -a \ 1387 --regex='/^[ \t]*config[ \t]+\([a-zA-Z0-9_]+\)/\1/'; \ 1388 $(all-defconfigs) | xargs -r $1 -a \ 1389 --regex='/^#?[ \t]?\(CONFIG_[a-zA-Z0-9_]+\)/\1/'; \ 1390 else \ 1391 $(all-sources) | xargs $1 -a; \ 1392 fi 1393endef 1394 1395quiet_cmd_cscope-file = FILELST cscope.files 1396 cmd_cscope-file = (echo \-k; echo \-q; $(all-sources)) > cscope.files 1397 1398quiet_cmd_cscope = MAKE cscope.out 1399 cmd_cscope = cscope -b 1400 1401cscope: FORCE 1402 $(call cmd,cscope-file) 1403 $(call cmd,cscope) 1404 1405quiet_cmd_TAGS = MAKE $@ 1406define cmd_TAGS 1407 rm -f $@; \ 1408 $(call xtags,etags) 1409endef 1410 1411TAGS: FORCE 1412 $(call cmd,TAGS) 1413 1414quiet_cmd_tags = MAKE $@ 1415define cmd_tags 1416 rm -f $@; \ 1417 $(call xtags,ctags) 1418endef 1419 1420tags: FORCE 1421 $(call cmd,tags) 1422 1423 1424# Scripts to check various things for consistency 1425# --------------------------------------------------------------------------- 1426 1427includecheck: 1428 find * $(RCS_FIND_IGNORE) \ 1429 -name '*.[hcS]' -type f -print | sort \ 1430 | xargs $(PERL) -w scripts/checkincludes.pl 1431 1432versioncheck: 1433 find * $(RCS_FIND_IGNORE) \ 1434 -name '*.[hcS]' -type f -print | sort \ 1435 | xargs $(PERL) -w scripts/checkversion.pl 1436 1437namespacecheck: 1438 $(PERL) $(srctree)/scripts/namespace.pl 1439 1440export_report: 1441 $(PERL) $(srctree)/scripts/export_report.pl 1442 1443endif #ifeq ($(config-targets),1) 1444endif #ifeq ($(mixed-targets),1) 1445 1446PHONY += checkstack kernelrelease kernelversion 1447 1448# UML needs a little special treatment here. It wants to use the host 1449# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1450# else wants $(ARCH), including people doing cross-builds, which means 1451# that $(SUBARCH) doesn't work here. 1452ifeq ($(ARCH), um) 1453CHECKSTACK_ARCH := $(SUBARCH) 1454else 1455CHECKSTACK_ARCH := $(ARCH) 1456endif 1457checkstack: 1458 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1459 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1460 1461kernelrelease: 1462 $(if $(wildcard include/config/kernel.release), $(Q)echo $(KERNELRELEASE), \ 1463 $(error kernelrelease not valid - run 'make prepare' to update it)) 1464kernelversion: 1465 @echo $(KERNELVERSION) 1466 1467# Single targets 1468# --------------------------------------------------------------------------- 1469# Single targets are compatible with: 1470# - build whith mixed source and output 1471# - build with separate output dir 'make O=...' 1472# - external modules 1473# 1474# target-dir => where to store outputfile 1475# build-dir => directory in kernel source tree to use 1476 1477ifeq ($(KBUILD_EXTMOD),) 1478 build-dir = $(patsubst %/,%,$(dir $@)) 1479 target-dir = $(dir $@) 1480else 1481 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@))) 1482 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash)) 1483 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@)) 1484endif 1485 1486%.s: %.c prepare scripts FORCE 1487 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1488%.i: %.c prepare scripts FORCE 1489 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1490%.o: %.c prepare scripts FORCE 1491 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1492%.lst: %.c prepare scripts FORCE 1493 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1494%.s: %.S prepare scripts FORCE 1495 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1496%.o: %.S prepare scripts FORCE 1497 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1498%.symtypes: %.c prepare scripts FORCE 1499 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1500 1501# Modules 1502/ %/: prepare scripts FORCE 1503 $(cmd_crmodverdir) 1504 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1505 $(build)=$(build-dir) 1506%.ko: prepare scripts FORCE 1507 $(cmd_crmodverdir) 1508 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1509 $(build)=$(build-dir) $(@:.ko=.o) 1510 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1511 1512# FIXME Should go into a make.lib or something 1513# =========================================================================== 1514 1515quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs))) 1516 cmd_rmdirs = rm -rf $(rm-dirs) 1517 1518quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1519 cmd_rmfiles = rm -f $(rm-files) 1520 1521# Run depmod only is we have System.map and depmod is executable 1522# and we build for the host arch 1523quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) 1524 cmd_depmod = \ 1525 if [ -r System.map -a -x $(DEPMOD) ]; then \ 1526 $(DEPMOD) -ae -F System.map \ 1527 $(if $(strip $(INSTALL_MOD_PATH)), -b $(INSTALL_MOD_PATH) -r) \ 1528 $(KERNELRELEASE); \ 1529 fi 1530 1531# Create temporary dir for module support files 1532# clean it up only when building all modules 1533cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \ 1534 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*) 1535 1536a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \ 1537 $(NOSTDINC_FLAGS) $(KBUILD_CPPFLAGS) \ 1538 $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o) 1539 1540quiet_cmd_as_o_S = AS $@ 1541cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $< 1542 1543# read all saved command lines 1544 1545targets := $(wildcard $(sort $(targets))) 1546cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd)) 1547 1548ifneq ($(cmd_files),) 1549 $(cmd_files): ; # Do not try to update included dependency files 1550 include $(cmd_files) 1551endif 1552 1553# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir 1554# Usage: 1555# $(Q)$(MAKE) $(clean)=dir 1556clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj 1557 1558endif # skip-makefile 1559 1560PHONY += FORCE 1561FORCE: 1562 1563# Cancel implicit rules on top Makefile, `-rR' will apply to sub-makes. 1564Makefile: ; 1565 1566# Declare the contents of the .PHONY variable as phony. We keep that 1567# information in a variable se we can use it in if_changed and friends. 1568.PHONY: $(PHONY) 1569