1VERSION = 1 2PATCHLEVEL = 14 3SUBLEVEL = 0 4EXTRAVERSION = 5NAME = Unnamed 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 print "Entering directory ..." 14MAKEFLAGS += --no-print-directory 15 16# We are using a recursive build, so we need to do a little thinking 17# to get the ordering right. 18# 19# Most importantly: sub-Makefiles should only ever modify files in 20# their own directory. If in some directory we have a dependency on 21# a file in another dir (which doesn't happen often, but it's often 22# unavoidable when linking the built-in.o targets which finally 23# turn into busybox), we will call a sub make in that other dir, and 24# after that we are sure that everything which is in that other dir 25# is now up to date. 26# 27# The only cases where we need to modify files which have global 28# effects are thus separated out and done before the recursive 29# descending is started. They are now explicitly listed as the 30# prepare rule. 31 32# To put more focus on warnings, be less verbose as default 33# Use 'make V=1' to see the full commands 34 35ifdef V 36 ifeq ("$(origin V)", "command line") 37 KBUILD_VERBOSE = $(V) 38 endif 39endif 40ifndef KBUILD_VERBOSE 41 KBUILD_VERBOSE = 0 42endif 43 44# Call sparse as part of compilation of C files 45# Use 'make C=1' to enable sparse checking 46 47ifdef C 48 ifeq ("$(origin C)", "command line") 49 KBUILD_CHECKSRC = $(C) 50 endif 51endif 52ifndef KBUILD_CHECKSRC 53 KBUILD_CHECKSRC = 0 54endif 55 56# Use make M=dir to specify directory of external module to build 57# Old syntax make ... SUBDIRS=$PWD is still supported 58# Setting the environment variable KBUILD_EXTMOD take precedence 59ifdef SUBDIRS 60 KBUILD_EXTMOD ?= $(SUBDIRS) 61endif 62ifdef M 63 ifeq ("$(origin M)", "command line") 64 KBUILD_EXTMOD := $(M) 65 endif 66endif 67 68 69# kbuild supports saving output files in a separate directory. 70# To locate output files in a separate directory two syntaxes are supported. 71# In both cases the working directory must be the root of the kernel src. 72# 1) O= 73# Use "make O=dir/to/store/output/files/" 74# 75# 2) Set KBUILD_OUTPUT 76# Set the environment variable KBUILD_OUTPUT to point to the directory 77# where the output files shall be placed. 78# export KBUILD_OUTPUT=dir/to/store/output/files/ 79# make 80# 81# The O= assignment takes precedence over the KBUILD_OUTPUT environment 82# variable. 83 84 85# KBUILD_SRC is set on invocation of make in OBJ directory 86# KBUILD_SRC is not intended to be used by the regular user (for now) 87ifeq ($(KBUILD_SRC),) 88 89# OK, Make called in directory where kernel src resides 90# Do we want to locate output files in a separate directory? 91ifdef O 92 ifeq ("$(origin O)", "command line") 93 KBUILD_OUTPUT := $(O) 94 endif 95endif 96 97# That's our default target when none is given on the command line 98PHONY := _all 99_all: 100 101ifneq ($(KBUILD_OUTPUT),) 102# Invoke a second make in the output directory, passing relevant variables 103# check that the output directory actually exists 104saved-output := $(KBUILD_OUTPUT) 105KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd) 106$(if $(KBUILD_OUTPUT),, \ 107 $(error output directory "$(saved-output)" does not exist)) 108 109PHONY += $(MAKECMDGOALS) 110 111$(filter-out _all,$(MAKECMDGOALS)) _all: 112 $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \ 113 KBUILD_SRC=$(CURDIR) \ 114 KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile $@ 115 116# Leave processing to above invocation of make 117skip-makefile := 1 118endif # ifneq ($(KBUILD_OUTPUT),) 119endif # ifeq ($(KBUILD_SRC),) 120 121# We process the rest of the Makefile if this is the final invocation of make 122ifeq ($(skip-makefile),) 123 124# If building an external module we do not care about the all: rule 125# but instead _all depend on modules 126PHONY += all 127ifeq ($(KBUILD_EXTMOD),) 128_all: all 129else 130_all: modules 131endif 132 133srctree := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR)) 134TOPDIR := $(srctree) 135# FIXME - TOPDIR is obsolete, use srctree/objtree 136objtree := $(CURDIR) 137src := $(srctree) 138obj := $(objtree) 139 140VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD)) 141 142export srctree objtree VPATH TOPDIR 143 144 145# Cross compiling and selecting different set of gcc/bin-utils 146# --------------------------------------------------------------------------- 147# 148# When performing cross compilation for other architectures ARCH shall be set 149# to the target architecture. (See arch/* for the possibilities). 150# ARCH can be set during invocation of make: 151# make ARCH=ia64 152# Another way is to have ARCH set in the environment. 153# The default ARCH is the host where make is executed. 154 155# CROSS_COMPILE specify the prefix used for all executables used 156# during compilation. Only gcc and related bin-utils executables 157# are prefixed with $(CROSS_COMPILE). 158# CROSS_COMPILE can be set on the command line 159# make CROSS_COMPILE=ia64-linux- 160# Alternatively CROSS_COMPILE can be set in the environment. 161# Default value for CROSS_COMPILE is not to prefix executables 162# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 163 164CROSS_COMPILE ?= 165# bbox: we may have CONFIG_CROSS_COMPILER_PREFIX in .config, 166# and it has not been included yet... thus using an awkward syntax. 167ifeq ($(CROSS_COMPILE),) 168CROSS_COMPILE := $(shell grep ^CONFIG_CROSS_COMPILER_PREFIX .config 2>/dev/null) 169CROSS_COMPILE := $(subst CONFIG_CROSS_COMPILER_PREFIX=,,$(CROSS_COMPILE)) 170CROSS_COMPILE := $(subst ",,$(CROSS_COMPILE)) 171#") 172endif 173 174# SUBARCH tells the usermode build what the underlying arch is. That is set 175# first, and if a usermode build is happening, the "ARCH=um" on the command 176# line overrides the setting of ARCH below. If a native build is happening, 177# then ARCH is assigned, getting whatever value it gets normally, and 178# SUBARCH is subsequently ignored. 179 180ifneq ($(CROSS_COMPILE),) 181SUBARCH := $(shell echo $(CROSS_COMPILE) | cut -d- -f1) 182else 183SUBARCH := $(shell uname -m) 184endif 185SUBARCH := $(shell echo $(SUBARCH) | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \ 186 -e s/arm.*/arm/ -e s/sa110/arm/ \ 187 -e s/s390x/s390/ -e s/parisc64/parisc/ \ 188 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ ) 189 190ARCH ?= $(SUBARCH) 191 192# Architecture as present in compile.h 193UTS_MACHINE := $(ARCH) 194 195# SHELL used by kbuild 196CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \ 197 else if [ -x /bin/bash ]; then echo /bin/bash; \ 198 else echo sh; fi ; fi) 199 200# Decide whether to build built-in, modular, or both. 201# Normally, just do built-in. 202 203KBUILD_MODULES := 204KBUILD_BUILTIN := 1 205 206# If we have only "make modules", don't compile built-in objects. 207# When we're building modules with modversions, we need to consider 208# the built-in objects during the descend as well, in order to 209# make sure the checksums are uptodate before we record them. 210 211ifeq ($(MAKECMDGOALS),modules) 212 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1) 213endif 214 215# If we have "make <whatever> modules", compile modules 216# in addition to whatever we do anyway. 217# Just "make" or "make all" shall build modules as well 218 219ifneq ($(filter all _all modules,$(MAKECMDGOALS)),) 220 KBUILD_MODULES := 1 221endif 222 223ifeq ($(MAKECMDGOALS),) 224 KBUILD_MODULES := 1 225endif 226 227export KBUILD_MODULES KBUILD_BUILTIN 228export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD 229 230# Beautify output 231# --------------------------------------------------------------------------- 232# 233# Normally, we echo the whole command before executing it. By making 234# that echo $($(quiet)$(cmd)), we now have the possibility to set 235# $(quiet) to choose other forms of output instead, e.g. 236# 237# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@ 238# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< 239# 240# If $(quiet) is empty, the whole command will be printed. 241# If it is set to "quiet_", only the short version will be printed. 242# If it is set to "silent_", nothing wil be printed at all, since 243# the variable $(silent_cmd_cc_o_c) doesn't exist. 244# 245# A simple variant is to prefix commands with $(Q) - that's useful 246# for commands that shall be hidden in non-verbose mode. 247# 248# $(Q)ln $@ :< 249# 250# If KBUILD_VERBOSE equals 0 then the above command will be hidden. 251# If KBUILD_VERBOSE equals 1 then the above command is displayed. 252 253ifeq ($(KBUILD_VERBOSE),1) 254 quiet = 255 Q = 256else 257 quiet=quiet_ 258 Q = @ 259endif 260 261# If the user is running make -s (silent mode), suppress echoing of 262# commands 263 264ifneq ($(findstring s,$(MAKEFLAGS)),) 265 quiet=silent_ 266endif 267 268export quiet Q KBUILD_VERBOSE 269 270 271# Look for make include files relative to root of kernel src 272MAKEFLAGS += --include-dir=$(srctree) 273 274HOSTCC = gcc 275HOSTCXX = g++ 276HOSTCFLAGS := 277HOSTCXXFLAGS := 278# We need some generic definitions 279include $(srctree)/scripts/Kbuild.include 280 281HOSTCFLAGS += $(call hostcc-option,-Wall -Wstrict-prototypes -O2 -fomit-frame-pointer,) 282HOSTCXXFLAGS += -O2 283 284# For maximum performance (+ possibly random breakage, uncomment 285# the following) 286 287MAKEFLAGS += -rR 288 289# Make variables (CC, etc...) 290 291AS = $(CROSS_COMPILE)as 292CC = $(CROSS_COMPILE)gcc 293LD = $(CC) -nostdlib 294CPP = $(CC) -E 295AR = $(CROSS_COMPILE)ar 296NM = $(CROSS_COMPILE)nm 297STRIP = $(CROSS_COMPILE)strip 298OBJCOPY = $(CROSS_COMPILE)objcopy 299OBJDUMP = $(CROSS_COMPILE)objdump 300AWK = awk 301GENKSYMS = scripts/genksyms/genksyms 302DEPMOD = /sbin/depmod 303KALLSYMS = scripts/kallsyms 304PERL = perl 305CHECK = sparse 306 307CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ -Wbitwise $(CF) 308MODFLAGS = -DMODULE 309CFLAGS_MODULE = $(MODFLAGS) 310AFLAGS_MODULE = $(MODFLAGS) 311LDFLAGS_MODULE = -r 312CFLAGS_KERNEL = 313AFLAGS_KERNEL = 314 315 316# Use LINUXINCLUDE when you must reference the include/ directory. 317# Needed to be compatible with the O= option 318CFLAGS := $(CFLAGS) 319# Added only to final link stage of busybox binary 320CFLAGS_busybox := $(CFLAGS_busybox) 321CPPFLAGS := $(CPPFLAGS) 322AFLAGS := $(AFLAGS) 323LDFLAGS := $(LDFLAGS) 324LDLIBS := 325 326# Read KERNELRELEASE from .kernelrelease (if it exists) 327KERNELRELEASE = $(shell cat .kernelrelease 2> /dev/null) 328KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION) 329 330export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION \ 331 ARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC \ 332 CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE \ 333 HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS 334 335export CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS 336export CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 337export AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 338export FLTFLAGS 339 340# When compiling out-of-tree modules, put MODVERDIR in the module 341# tree rather than in the kernel tree. The kernel tree might 342# even be read-only. 343export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions 344 345# Files to ignore in find ... statements 346 347RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS -o -name .pc -o -name .hg -o -name .git \) -prune -o 348export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git 349 350# =========================================================================== 351# Rules shared between *config targets and build targets 352 353# Basic helpers built in scripts/ 354PHONY += scripts_basic 355scripts_basic: 356 $(Q)$(MAKE) $(build)=scripts/basic 357 358# To avoid any implicit rule to kick in, define an empty command. 359scripts/basic/%: scripts_basic ; 360 361PHONY += outputmakefile 362# outputmakefile generates a Makefile in the output directory, if using a 363# separate output directory. This allows convenient use of make in the 364# output directory. 365outputmakefile: 366ifneq ($(KBUILD_SRC),) 367 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \ 368 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL) 369endif 370 371# To make sure we do not include .config for any of the *config targets 372# catch them early, and hand them over to scripts/kconfig/Makefile 373# It is allowed to specify more targets when calling make, including 374# mixing *config targets and build targets. 375# For example 'make oldconfig all'. 376# Detect when mixed targets is specified, and make a second invocation 377# of make so .config is not included in this case either (for *config). 378 379no-dot-config-targets := clean mrproper distclean \ 380 cscope TAGS tags help %docs 381#bbox# check% is removed from above 382 383config-targets := 0 384mixed-targets := 0 385dot-config := 1 386 387ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 388 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 389 dot-config := 0 390 endif 391endif 392 393ifeq ($(KBUILD_EXTMOD),) 394 ifneq ($(filter config %config,$(MAKECMDGOALS)),) 395 config-targets := 1 396 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),) 397 mixed-targets := 1 398 endif 399 endif 400endif 401 402ifeq ($(mixed-targets),1) 403# =========================================================================== 404# We're called with mixed targets (*config and build targets). 405# Handle them one by one. 406 407%:: FORCE 408 $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@ 409 410else 411ifeq ($(config-targets),1) 412# =========================================================================== 413# *config targets only - make sure prerequisites are updated, and descend 414# in scripts/kconfig to make the *config target 415 416# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 417# KBUILD_DEFCONFIG may point out an alternative default configuration 418# used for 'make defconfig' 419-include $(srctree)/arch/$(ARCH)/Makefile 420export KBUILD_DEFCONFIG 421 422config %config: scripts_basic outputmakefile FORCE 423 $(Q)mkdir -p include 424 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 425 $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= .kernelrelease 426 427else 428# =========================================================================== 429# Build targets only - this includes busybox, arch specific targets, clean 430# targets and others. In general all targets except *config targets. 431 432ifeq ($(KBUILD_EXTMOD),) 433# Additional helpers built in scripts/ 434# Carefully list dependencies so we do not try to build scripts twice 435# in parrallel 436PHONY += scripts 437scripts: scripts_basic include/config/MARKER 438 $(Q)$(MAKE) $(build)=$(@) 439 440scripts_basic: include/autoconf.h 441 442# Objects we will link into busybox / subdirs we need to visit 443core-y := \ 444 applets/ \ 445 446libs-y := \ 447 archival/ \ 448 archival/libunarchive/ \ 449 console-tools/ \ 450 coreutils/ \ 451 coreutils/libcoreutils/ \ 452 debianutils/ \ 453 e2fsprogs/ \ 454 editors/ \ 455 findutils/ \ 456 init/ \ 457 libbb/ \ 458 libpwdgrp/ \ 459 loginutils/ \ 460 mailutils/ \ 461 miscutils/ \ 462 modutils/ \ 463 networking/ \ 464 networking/libiproute/ \ 465 networking/udhcp/ \ 466 printutils/ \ 467 procps/ \ 468 runit/ \ 469 selinux/ \ 470 shell/ \ 471 sysklogd/ \ 472 util-linux/ \ 473 util-linux/volume_id/ \ 474 475endif # KBUILD_EXTMOD 476 477ifeq ($(dot-config),1) 478# In this section, we need .config 479 480# Read in dependencies to all Kconfig* files, make sure to run 481# oldconfig if changes are detected. 482-include .kconfig.d 483 484-include .config 485 486# If .config needs to be updated, it will be done via the dependency 487# that autoconf has on .config. 488# To avoid any implicit rule to kick in, define an empty command 489.config .kconfig.d: ; 490 491# Now we can define CFLAGS etc according to .config 492include $(srctree)/Makefile.flags 493 494# If .config is newer than include/autoconf.h, someone tinkered 495# with it and forgot to run make oldconfig. 496# If kconfig.d is missing then we are probarly in a cleaned tree so 497# we execute the config step to be sure to catch updated Kconfig files 498include/autoconf.h: .kconfig.d .config 499 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig 500 501else 502# Dummy target needed, because used as prerequisite 503include/autoconf.h: ; 504endif 505 506# The all: target is the default when no target is given on the 507# command line. 508# This allow a user to issue only 'make' to build a kernel including modules 509# Defaults busybox but it is usually overridden in the arch makefile 510all: busybox doc 511 512-include $(srctree)/arch/$(ARCH)/Makefile 513 514# arch Makefile may override CC so keep this after arch Makefile is included 515#bbox# NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) 516CHECKFLAGS += $(NOSTDINC_FLAGS) 517 518# Default kernel image to build when no specific target is given. 519# KBUILD_IMAGE may be overruled on the commandline or 520# set in the environment 521# Also any assignments in arch/$(ARCH)/Makefile take precedence over 522# this default value 523export KBUILD_IMAGE ?= busybox 524 525# 526# INSTALL_PATH specifies where to place the updated kernel and system map 527# images. Default is /boot, but you can set it to other values 528export INSTALL_PATH ?= /boot 529 530# 531# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 532# relocations required by build roots. This is not defined in the 533# makefile but the arguement can be passed to make if needed. 534# 535 536MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 537export MODLIB 538 539 540ifeq ($(KBUILD_EXTMOD),) 541busybox-dirs := $(patsubst %/,%,$(filter %/, $(core-y) $(core-m) $(libs-y) $(libs-m))) 542 543busybox-alldirs := $(sort $(busybox-dirs) $(patsubst %/,%,$(filter %/, \ 544 $(core-n) $(core-) $(libs-n) $(libs-) \ 545 ))) 546 547core-y := $(patsubst %/, %/built-in.o, $(core-y)) 548libs-y1 := $(patsubst %/, %/lib.a, $(libs-y)) 549libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y)) 550libs-y := $(libs-y1) $(libs-y2) 551 552# Build busybox 553# --------------------------------------------------------------------------- 554# busybox is build from the objects selected by $(busybox-init) and 555# $(busybox-main). Most are built-in.o files from top-level directories 556# in the kernel tree, others are specified in arch/$(ARCH)Makefile. 557# Ordering when linking is important, and $(busybox-init) must be first. 558# 559# busybox 560# ^ 561# | 562# +-< $(busybox-init) 563# | +--< init/version.o + more 564# | 565# +--< $(busybox-main) 566# | +--< driver/built-in.o mm/built-in.o + more 567# | 568# +-< kallsyms.o (see description in CONFIG_KALLSYMS section) 569# 570# busybox version (uname -v) cannot be updated during normal 571# descending-into-subdirs phase since we do not yet know if we need to 572# update busybox. 573# Therefore this step is delayed until just before final link of busybox - 574# except in the kallsyms case where it is done just before adding the 575# symbols to the kernel. 576# 577# System.map is generated to document addresses of all kernel symbols 578 579busybox-all := $(core-y) $(libs-y) 580 581# Rule to link busybox - also used during CONFIG_KALLSYMS 582# May be overridden by arch/$(ARCH)/Makefile 583quiet_cmd_busybox__ ?= LINK $@ 584 cmd_busybox__ ?= $(srctree)/scripts/trylink \ 585 "$@" \ 586 "$(CC)" \ 587 "$(CFLAGS) $(CFLAGS_busybox)" \ 588 "$(LDFLAGS) $(EXTRA_LDFLAGS)" \ 589 "$(core-y)" \ 590 "$(libs-y)" \ 591 "$(LDLIBS)" 592 593# Generate System.map 594quiet_cmd_sysmap = SYSMAP 595 cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap 596 597# Link of busybox 598# If CONFIG_KALLSYMS is set .version is already updated 599# Generate System.map and verify that the content is consistent 600# Use + in front of the busybox_version rule to silent warning with make -j2 601# First command is ':' to allow us to use + in front of the rule 602define rule_busybox__ 603 : 604 $(call cmd,busybox__) 605 $(Q)echo 'cmd_$@ := $(cmd_busybox__)' > $(@D)/.$(@F).cmd 606endef 607 608 609ifdef CONFIG_KALLSYMS 610# Generate section listing all symbols and add it into busybox $(kallsyms.o) 611# It's a three stage process: 612# o .tmp_busybox1 has all symbols and sections, but __kallsyms is 613# empty 614# Running kallsyms on that gives us .tmp_kallsyms1.o with 615# the right size - busybox version (uname -v) is updated during this step 616# o .tmp_busybox2 now has a __kallsyms section of the right size, 617# but due to the added section, some addresses have shifted. 618# From here, we generate a correct .tmp_kallsyms2.o 619# o The correct .tmp_kallsyms2.o is linked into the final busybox. 620# o Verify that the System.map from busybox matches the map from 621# .tmp_busybox2, just in case we did not generate kallsyms correctly. 622# o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using 623# .tmp_busybox3 and .tmp_kallsyms3.o. This is only meant as a 624# temporary bypass to allow the kernel to be built while the 625# maintainers work out what went wrong with kallsyms. 626 627ifdef CONFIG_KALLSYMS_EXTRA_PASS 628last_kallsyms := 3 629else 630last_kallsyms := 2 631endif 632 633kallsyms.o := .tmp_kallsyms$(last_kallsyms).o 634 635define verify_kallsyms 636 $(Q)$(if $($(quiet)cmd_sysmap), \ 637 echo ' $($(quiet)cmd_sysmap) .tmp_System.map' &&) \ 638 $(cmd_sysmap) .tmp_busybox$(last_kallsyms) .tmp_System.map 639 $(Q)cmp -s System.map .tmp_System.map || \ 640 (echo Inconsistent kallsyms data; \ 641 echo Try setting CONFIG_KALLSYMS_EXTRA_PASS; \ 642 rm .tmp_kallsyms* ; /bin/false ) 643endef 644 645# Update busybox version before link 646# Use + in front of this rule to silent warning about make -j1 647# First command is ':' to allow us to use + in front of this rule 648cmd_ksym_ld = $(cmd_busybox__) 649define rule_ksym_ld 650 : 651 +$(call cmd,busybox_version) 652 $(call cmd,busybox__) 653 $(Q)echo 'cmd_$@ := $(cmd_busybox__)' > $(@D)/.$(@F).cmd 654endef 655 656# Generate .S file with all kernel symbols 657quiet_cmd_kallsyms = KSYM $@ 658 cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \ 659 $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@ 660 661.tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE 662 $(call if_changed_dep,as_o_S) 663 664.tmp_kallsyms%.S: .tmp_busybox% $(KALLSYMS) 665 $(call cmd,kallsyms) 666 667# .tmp_busybox1 must be complete except kallsyms, so update busybox version 668.tmp_busybox1: $(busybox-lds) $(busybox-all) FORCE 669 $(call if_changed_rule,ksym_ld) 670 671.tmp_busybox2: $(busybox-lds) $(busybox-all) .tmp_kallsyms1.o FORCE 672 $(call if_changed,busybox__) 673 674.tmp_busybox3: $(busybox-lds) $(busybox-all) .tmp_kallsyms2.o FORCE 675 $(call if_changed,busybox__) 676 677# Needs to visit scripts/ before $(KALLSYMS) can be used. 678$(KALLSYMS): scripts ; 679 680# Generate some data for debugging strange kallsyms problems 681debug_kallsyms: .tmp_map$(last_kallsyms) 682 683.tmp_map%: .tmp_busybox% FORCE 684 ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@ 685 686.tmp_map3: .tmp_map2 687 688.tmp_map2: .tmp_map1 689 690endif # ifdef CONFIG_KALLSYMS 691 692# busybox image - including updated kernel symbols 693busybox_unstripped: $(busybox-all) FORCE 694 $(call if_changed_rule,busybox__) 695 $(Q)rm -f .old_version 696 697busybox: busybox_unstripped 698ifeq ($(SKIP_STRIP),y) 699 $(Q)cp $< $@ 700else 701 $(Q)$(STRIP) -s --remove-section=.note --remove-section=.comment \ 702 busybox_unstripped -o $@ 703# strip is confused by PIE executable and does not set exec bits 704 $(Q)chmod a+x $@ 705endif 706 707# The actual objects are generated when descending, 708# make sure no implicit rule kicks in 709$(sort $(busybox-all)): $(busybox-dirs) ; 710 711# Handle descending into subdirectories listed in $(busybox-dirs) 712# Preset locale variables to speed up the build process. Limit locale 713# tweaks to this spot to avoid wrong language settings when running 714# make menuconfig etc. 715# Error messages still appears in the original language 716 717PHONY += $(busybox-dirs) 718$(busybox-dirs): prepare scripts 719 $(Q)$(MAKE) $(build)=$@ 720 721# Build the kernel release string 722# The KERNELRELEASE is stored in a file named .kernelrelease 723# to be used when executing for example make install or make modules_install 724# 725# Take the contents of any files called localversion* and the config 726# variable CONFIG_LOCALVERSION and append them to KERNELRELEASE. 727# LOCALVERSION from the command line override all of this 728 729nullstring := 730space := $(nullstring) # end of line 731 732___localver = $(objtree)/localversion* $(srctree)/localversion* 733__localver = $(sort $(wildcard $(___localver))) 734# skip backup files (containing '~') 735_localver = $(foreach f, $(__localver), $(if $(findstring ~, $(f)),,$(f))) 736 737localver = $(subst $(space),, \ 738 $(shell cat /dev/null $(_localver)) \ 739 $(patsubst "%",%,$(CONFIG_LOCALVERSION))) 740 741# If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called 742# and if the SCM is know a tag from the SCM is appended. 743# The appended tag is determinded by the SCM used. 744# 745# Currently, only git is supported. 746# Other SCMs can edit scripts/setlocalversion and add the appropriate 747# checks as needed. 748ifdef _BB_DISABLED_CONFIG_LOCALVERSION_AUTO 749 _localver-auto = $(shell $(CONFIG_SHELL) \ 750 $(srctree)/scripts/setlocalversion $(srctree)) 751 localver-auto = $(LOCALVERSION)$(_localver-auto) 752endif 753 754localver-full = $(localver)$(localver-auto) 755 756# Store (new) KERNELRELASE string in .kernelrelease 757kernelrelease = $(KERNELVERSION)$(localver-full) 758.kernelrelease: FORCE 759 $(Q)rm -f $@ 760 $(Q)echo $(kernelrelease) > $@ 761 762 763# Things we need to do before we recursively start building the kernel 764# or the modules are listed in "prepare". 765# A multi level approach is used. prepareN is processed before prepareN-1. 766# archprepare is used in arch Makefiles and when processed asm symlink, 767# version.h and scripts_basic is processed / created. 768 769# Listed in dependency order 770PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3 771 772# prepare-all is deprecated, use prepare as valid replacement 773PHONY += prepare-all 774 775# prepare3 is used to check if we are building in a separate output directory, 776# and if so do: 777# 1) Check that make has not been executed in the kernel src $(srctree) 778# 2) Create the include2 directory, used for the second asm symlink 779prepare3: .kernelrelease 780ifneq ($(KBUILD_SRC),) 781 @echo ' Using $(srctree) as source for busybox' 782 $(Q)if [ -f $(srctree)/.config ]; then \ 783 echo " $(srctree) is not clean, please run 'make mrproper'";\ 784 echo " in the '$(srctree)' directory.";\ 785 /bin/false; \ 786 fi; 787 $(Q)if [ ! -d include2 ]; then mkdir -p include2; fi; 788 $(Q)ln -fsn $(srctree)/include/asm-$(ARCH) include2/asm 789endif 790 791# prepare2 creates a makefile if using a separate output directory 792prepare2: prepare3 outputmakefile 793 794prepare1: prepare2 include/config/MARKER 795ifneq ($(KBUILD_MODULES),) 796 $(Q)mkdir -p $(MODVERDIR) 797 $(Q)rm -f $(MODVERDIR)/* 798endif 799 800archprepare: prepare1 scripts_basic 801 802prepare0: archprepare FORCE 803 $(Q)$(MAKE) $(build)=. 804 805# All the preparing.. 806prepare prepare-all: prepare0 807 808# Leave this as default for preprocessing busybox.lds.S, which is now 809# done in arch/$(ARCH)/kernel/Makefile 810 811export CPPFLAGS_busybox.lds += -P -C -U$(ARCH) 812 813# FIXME: The asm symlink changes when $(ARCH) changes. That's 814# hard to detect, but I suppose "make mrproper" is a good idea 815# before switching between archs anyway. 816 817#bbox# include/asm: 818#bbox# @echo ' SYMLINK $@ -> include/asm-$(ARCH)' 819#bbox# $(Q)if [ ! -d include ]; then mkdir -p include; fi; 820#bbox# @ln -fsn asm-$(ARCH) $@ 821 822# Split autoconf.h into include/linux/config/* 823quiet_cmd_gen_bbconfigopts = GEN include/bbconfigopts.h 824 cmd_gen_bbconfigopts = $(srctree)/scripts/mkconfigs > include/bbconfigopts.h 825quiet_cmd_split_autoconf = SPLIT include/autoconf.h -> include/config/* 826 cmd_split_autoconf = scripts/basic/split-include include/autoconf.h include/config 827#bbox# piggybacked generation of few .h files 828include/config/MARKER: scripts/basic/split-include include/autoconf.h 829 $(call cmd,split_autoconf) 830 $(call cmd,gen_bbconfigopts) 831 @touch $@ 832 833# Generate some files 834# --------------------------------------------------------------------------- 835 836# KERNELRELEASE can change from a few different places, meaning version.h 837# needs to be updated, so this check is forced on all builds 838 839uts_len := 64 840 841define filechk_version.h 842 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 843 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 844 exit 1; \ 845 fi; \ 846 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"; \ 847 echo \#define LINUX_VERSION_CODE `expr $(VERSION) \\* 65536 + $(PATCHLEVEL) \\* 256 + $(SUBLEVEL)`; \ 848 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'; \ 849 ) 850endef 851 852# --------------------------------------------------------------------------- 853 854PHONY += depend dep 855depend dep: 856 @echo '*** Warning: make $@ is unnecessary now.' 857 858# --------------------------------------------------------------------------- 859# Modules 860 861ifdef _BB_DISABLED_CONFIG_MODULES 862 863# By default, build modules as well 864 865all: modules 866 867# Build modules 868 869PHONY += modules 870modules: $(busybox-dirs) $(if $(KBUILD_BUILTIN),busybox) 871 @echo ' Building modules, stage 2.'; 872 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost 873 874 875# Target to prepare building external modules 876PHONY += modules_prepare 877modules_prepare: prepare scripts 878 879# Target to install modules 880PHONY += modules_install 881modules_install: _modinst_ _modinst_post 882 883PHONY += _modinst_ 884_modinst_: 885 @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \ 886 echo "Warning: you may need to install module-init-tools"; \ 887 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\ 888 sleep 1; \ 889 fi 890 @rm -rf $(MODLIB)/kernel 891 @rm -f $(MODLIB)/source 892 @mkdir -p $(MODLIB)/kernel 893 @ln -s $(srctree) $(MODLIB)/source 894 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 895 rm -f $(MODLIB)/build ; \ 896 ln -s $(objtree) $(MODLIB)/build ; \ 897 fi 898 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modinst 899 900# If System.map exists, run depmod. This deliberately does not have a 901# dependency on System.map since that would run the dependency tree on 902# busybox. This depmod is only for convenience to give the initial 903# boot a modules.dep even before / is mounted read-write. However the 904# boot script depmod is the master version. 905ifeq "$(strip $(INSTALL_MOD_PATH))" "" 906depmod_opts := 907else 908depmod_opts := -b $(INSTALL_MOD_PATH) -r 909endif 910PHONY += _modinst_post 911_modinst_post: _modinst_ 912 if [ -r System.map -a -x $(DEPMOD) ]; then $(DEPMOD) -ae -F System.map $(depmod_opts) $(KERNELRELEASE); fi 913 914else # CONFIG_MODULES 915 916# Modules not configured 917# --------------------------------------------------------------------------- 918 919modules modules_install: FORCE 920 @echo 921 @echo "The present busybox configuration has modules disabled." 922 @echo "Type 'make config' and enable loadable module support." 923 @echo "Then build a kernel with module support enabled." 924 @echo 925 @exit 1 926 927endif # CONFIG_MODULES 928 929### 930# Cleaning is done on three levels. 931# make clean Delete most generated files 932# Leave enough to build external modules 933# make mrproper Delete the current configuration, and all generated files 934# make distclean Remove editor backup files, patch leftover files and the like 935 936# Directories & files removed with 'make clean' 937CLEAN_DIRS += $(MODVERDIR) _install 0_lib 938CLEAN_FILES += busybox busybox_unstripped* busybox.links \ 939 System.map .kernelrelease \ 940 .tmp_kallsyms* .tmp_version .tmp_busybox* .tmp_System.map 941 942# Directories & files removed with 'make mrproper' 943MRPROPER_DIRS += include/config include2 944MRPROPER_FILES += .config .config.old include/asm .version .old_version \ 945 include/autoconf.h \ 946 include/bbconfigopts.h \ 947 include/usage_compressed.h \ 948 include/applet_tables.h \ 949 applets/usage \ 950 .kernelrelease Module.symvers tags TAGS cscope* \ 951 busybox_old 952 953# clean - Delete most, but leave enough to build external modules 954# 955clean: rm-dirs := $(CLEAN_DIRS) 956clean: rm-files := $(CLEAN_FILES) 957clean-dirs := $(addprefix _clean_,$(srctree) $(busybox-alldirs)) 958 959PHONY += $(clean-dirs) clean archclean 960$(clean-dirs): 961 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 962 963clean: archclean $(clean-dirs) 964 $(call cmd,rmdirs) 965 $(call cmd,rmfiles) 966 @find . $(RCS_FIND_IGNORE) \ 967 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \ 968 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \ 969 -type f -print | xargs rm -f 970 971PHONY += doc-clean 972doc-clean: rm-files := docs/busybox.pod \ 973 docs/BusyBox.html docs/BusyBox.1 docs/BusyBox.txt 974doc-clean: 975 $(call cmd,rmfiles) 976 977# mrproper - Delete all generated files, including .config 978# 979mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS)) 980mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 981mrproper-dirs := $(addprefix _mrproper_,scripts) 982 983PHONY += $(mrproper-dirs) mrproper archmrproper 984$(mrproper-dirs): 985 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 986 987mrproper: clean archmrproper $(mrproper-dirs) 988 $(call cmd,rmdirs) 989 $(call cmd,rmfiles) 990 991# distclean 992# 993PHONY += distclean 994 995distclean: mrproper 996 @find $(srctree) $(RCS_FIND_IGNORE) \ 997 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 998 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \ 999 -o -name '.*.rej' -o -name '*.tmp' -o -size 0 \ 1000 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1001 -type f -print | xargs rm -f 1002 1003 1004# Packaging of the kernel to various formats 1005# --------------------------------------------------------------------------- 1006# rpm target kept for backward compatibility 1007package-dir := $(srctree)/scripts/package 1008 1009%pkg: FORCE 1010 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1011rpm: FORCE 1012 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1013 1014 1015# Brief documentation of the typical targets used 1016# --------------------------------------------------------------------------- 1017 1018boards := $(wildcard $(srctree)/arch/$(ARCH)/configs/*_defconfig) 1019boards := $(notdir $(boards)) 1020 1021-include $(srctree)/Makefile.help 1022 1023# Documentation targets 1024# --------------------------------------------------------------------------- 1025%docs: scripts_basic FORCE 1026 $(Q)$(MAKE) $(build)=Documentation/DocBook $@ 1027 1028else # KBUILD_EXTMOD 1029 1030### 1031# External module support. 1032# When building external modules the kernel used as basis is considered 1033# read-only, and no consistency checks are made and the make 1034# system is not used on the basis kernel. If updates are required 1035# in the basis kernel ordinary make commands (without M=...) must 1036# be used. 1037# 1038# The following are the only valid targets when building external 1039# modules. 1040# make M=dir clean Delete all automatically generated files 1041# make M=dir modules Make all modules in specified dir 1042# make M=dir Same as 'make M=dir modules' 1043# make M=dir modules_install 1044# Install the modules build in the module directory 1045# Assumes install directory is already created 1046 1047# We are always building modules 1048KBUILD_MODULES := 1 1049PHONY += crmodverdir 1050crmodverdir: 1051 $(Q)mkdir -p $(MODVERDIR) 1052 $(Q)rm -f $(MODVERDIR)/* 1053 1054PHONY += $(objtree)/Module.symvers 1055$(objtree)/Module.symvers: 1056 @test -e $(objtree)/Module.symvers || ( \ 1057 echo; \ 1058 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \ 1059 echo " is missing; modules will have no dependencies and modversions."; \ 1060 echo ) 1061 1062module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD)) 1063PHONY += $(module-dirs) modules 1064$(module-dirs): crmodverdir $(objtree)/Module.symvers 1065 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@) 1066 1067modules: $(module-dirs) 1068 @echo ' Building modules, stage 2.'; 1069 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost 1070 1071PHONY += modules_install 1072modules_install: _emodinst_ _emodinst_post 1073 1074install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra) 1075PHONY += _emodinst_ 1076_emodinst_: 1077 $(Q)mkdir -p $(MODLIB)/$(install-dir) 1078 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modinst 1079 1080# Run depmod only is we have System.map and depmod is executable 1081quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) 1082 cmd_depmod = if [ -r System.map -a -x $(DEPMOD) ]; then \ 1083 $(DEPMOD) -ae -F System.map \ 1084 $(if $(strip $(INSTALL_MOD_PATH)), \ 1085 -b $(INSTALL_MOD_PATH) -r) \ 1086 $(KERNELRELEASE); \ 1087 fi 1088 1089PHONY += _emodinst_post 1090_emodinst_post: _emodinst_ 1091 $(call cmd,depmod) 1092 1093clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD)) 1094 1095PHONY += $(clean-dirs) clean 1096$(clean-dirs): 1097 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1098 1099clean: rm-dirs := $(MODVERDIR) 1100clean: $(clean-dirs) 1101 $(call cmd,rmdirs) 1102 @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \ 1103 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \ 1104 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \ 1105 -type f -print | xargs rm -f 1106 1107help: 1108 @echo ' Building external modules.' 1109 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1110 @echo '' 1111 @echo ' modules - default target, build the module(s)' 1112 @echo ' modules_install - install the module' 1113 @echo ' clean - remove generated files in module directory only' 1114 @echo '' 1115 1116# Dummies... 1117PHONY += prepare scripts 1118prepare: ; 1119scripts: ; 1120endif # KBUILD_EXTMOD 1121 1122# Generate tags for editors 1123# --------------------------------------------------------------------------- 1124 1125#We want __srctree to totally vanish out when KBUILD_OUTPUT is not set 1126#(which is the most common case IMHO) to avoid unneeded clutter in the big tags file. 1127#Adding $(srctree) adds about 20M on i386 to the size of the output file! 1128 1129ifeq ($(src),$(obj)) 1130__srctree = 1131else 1132__srctree = $(srctree)/ 1133endif 1134 1135ifeq ($(ALLSOURCE_ARCHS),) 1136ifeq ($(ARCH),um) 1137ALLINCLUDE_ARCHS := $(ARCH) $(SUBARCH) 1138else 1139ALLINCLUDE_ARCHS := $(ARCH) 1140endif 1141else 1142#Allow user to specify only ALLSOURCE_PATHS on the command line, keeping existing behaviour. 1143ALLINCLUDE_ARCHS := $(ALLSOURCE_ARCHS) 1144endif 1145 1146ALLSOURCE_ARCHS := $(ARCH) 1147 1148define all-sources 1149 ( find $(__srctree) $(RCS_FIND_IGNORE) \ 1150 \( -name include -o -name arch \) -prune -o \ 1151 -name '*.[chS]' -print; \ 1152 for ARCH in $(ALLSOURCE_ARCHS) ; do \ 1153 find $(__srctree)arch/$${ARCH} $(RCS_FIND_IGNORE) \ 1154 -name '*.[chS]' -print; \ 1155 done ; \ 1156 find $(__srctree)security/selinux/include $(RCS_FIND_IGNORE) \ 1157 -name '*.[chS]' -print; \ 1158 find $(__srctree)include $(RCS_FIND_IGNORE) \ 1159 \( -name config -o -name 'asm-*' \) -prune \ 1160 -o -name '*.[chS]' -print; \ 1161 for ARCH in $(ALLINCLUDE_ARCHS) ; do \ 1162 find $(__srctree)include/asm-$${ARCH} $(RCS_FIND_IGNORE) \ 1163 -name '*.[chS]' -print; \ 1164 done ; \ 1165 find $(__srctree)include/asm-generic $(RCS_FIND_IGNORE) \ 1166 -name '*.[chS]' -print ) 1167endef 1168 1169quiet_cmd_cscope-file = FILELST cscope.files 1170 cmd_cscope-file = (echo \-k; echo \-q; $(all-sources)) > cscope.files 1171 1172quiet_cmd_cscope = MAKE cscope.out 1173 cmd_cscope = cscope -b 1174 1175cscope: FORCE 1176 $(call cmd,cscope-file) 1177 $(call cmd,cscope) 1178 1179quiet_cmd_TAGS = MAKE $@ 1180define cmd_TAGS 1181 rm -f $@; \ 1182 ETAGSF=`etags --version | grep -i exuberant >/dev/null && \ 1183 echo "-I __initdata,__exitdata,__acquires,__releases \ 1184 -I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL \ 1185 --extra=+f --c-kinds=+px"`; \ 1186 $(all-sources) | xargs etags $$ETAGSF -a 1187endef 1188 1189TAGS: FORCE 1190 $(call cmd,TAGS) 1191 1192 1193quiet_cmd_tags = MAKE $@ 1194define cmd_tags 1195 rm -f $@; \ 1196 CTAGSF=`ctags --version | grep -i exuberant >/dev/null && \ 1197 echo "-I __initdata,__exitdata,__acquires,__releases \ 1198 -I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL \ 1199 --extra=+f --c-kinds=+px"`; \ 1200 $(all-sources) | xargs ctags $$CTAGSF -a 1201endef 1202 1203tags: FORCE 1204 $(call cmd,tags) 1205 1206 1207# Scripts to check various things for consistency 1208# --------------------------------------------------------------------------- 1209 1210includecheck: 1211 find * $(RCS_FIND_IGNORE) \ 1212 -name '*.[hcS]' -type f -print | sort \ 1213 | xargs $(PERL) -w scripts/checkincludes.pl 1214 1215versioncheck: 1216 find * $(RCS_FIND_IGNORE) \ 1217 -name '*.[hcS]' -type f -print | sort \ 1218 | xargs $(PERL) -w scripts/checkversion.pl 1219 1220namespacecheck: 1221 $(PERL) $(srctree)/scripts/namespace.pl 1222 1223endif #ifeq ($(config-targets),1) 1224endif #ifeq ($(mixed-targets),1) 1225 1226PHONY += checkstack 1227checkstack: 1228 $(OBJDUMP) -d busybox $$(find . -name '*.ko') | \ 1229 $(PERL) $(src)/scripts/checkstack.pl $(ARCH) 1230 1231kernelrelease: 1232 $(if $(wildcard .kernelrelease), $(Q)echo $(KERNELRELEASE), \ 1233 $(error kernelrelease not valid - run 'make *config' to update it)) 1234kernelversion: 1235 @echo $(KERNELVERSION) 1236 1237# Single targets 1238# --------------------------------------------------------------------------- 1239# Single targets are compatible with: 1240# - build whith mixed source and output 1241# - build with separate output dir 'make O=...' 1242# - external modules 1243# 1244# target-dir => where to store outputfile 1245# build-dir => directory in kernel source tree to use 1246 1247ifeq ($(KBUILD_EXTMOD),) 1248 build-dir = $(patsubst %/,%,$(dir $@)) 1249 target-dir = $(dir $@) 1250else 1251 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@))) 1252 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash)) 1253 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@)) 1254endif 1255 1256%.s: %.c prepare scripts FORCE 1257 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1258%.i: %.c prepare scripts FORCE 1259 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1260%.o: %.c prepare scripts FORCE 1261 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1262%.lst: %.c prepare scripts FORCE 1263 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1264%.s: %.S prepare scripts FORCE 1265 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1266%.o: %.S prepare scripts FORCE 1267 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1268 1269# Modules 1270/ %/: prepare scripts FORCE 1271 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1272 $(build)=$(build-dir) 1273%.ko: prepare scripts FORCE 1274 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1275 $(build)=$(build-dir) $(@:.ko=.o) 1276 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost 1277 1278# FIXME Should go into a make.lib or something 1279# =========================================================================== 1280 1281quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs))) 1282 cmd_rmdirs = rm -rf $(rm-dirs) 1283 1284quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1285 cmd_rmfiles = rm -f $(rm-files) 1286 1287 1288a_flags = -Wp,-MD,$(depfile) $(AFLAGS) $(AFLAGS_KERNEL) \ 1289 $(NOSTDINC_FLAGS) $(CPPFLAGS) \ 1290 $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(*F).o) 1291 1292quiet_cmd_as_o_S = AS $@ 1293cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $< 1294 1295# read all saved command lines 1296 1297targets := $(wildcard $(sort $(targets))) 1298cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd)) 1299 1300ifneq ($(cmd_files),) 1301 $(cmd_files): ; # Do not try to update included dependency files 1302 include $(cmd_files) 1303endif 1304 1305# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir 1306# Usage: 1307# $(Q)$(MAKE) $(clean)=dir 1308clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj 1309 1310endif # skip-makefile 1311 1312PHONY += FORCE 1313FORCE: 1314 1315-include $(srctree)/Makefile.custom 1316 1317# Declare the contents of the .PHONY variable as phony. We keep that 1318# information in a variable se we can use it in if_changed and friends. 1319.PHONY: $(PHONY) 1320