1VERSION = 1 2PATCHLEVEL = 13 3SUBLEVEL = 3 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)) 171endif 172 173# SUBARCH tells the usermode build what the underlying arch is. That is set 174# first, and if a usermode build is happening, the "ARCH=um" on the command 175# line overrides the setting of ARCH below. If a native build is happening, 176# then ARCH is assigned, getting whatever value it gets normally, and 177# SUBARCH is subsequently ignored. 178 179ifneq ($(CROSS_COMPILE),) 180SUBARCH := $(shell echo $(CROSS_COMPILE) | cut -d- -f1) 181else 182SUBARCH := $(shell uname -m) 183endif 184SUBARCH := $(shell echo $(SUBARCH) | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \ 185 -e s/arm.*/arm/ -e s/sa110/arm/ \ 186 -e s/s390x/s390/ -e s/parisc64/parisc/ \ 187 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ ) 188 189ARCH ?= $(SUBARCH) 190 191# Architecture as present in compile.h 192UTS_MACHINE := $(ARCH) 193 194# SHELL used by kbuild 195CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \ 196 else if [ -x /bin/bash ]; then echo /bin/bash; \ 197 else echo sh; fi ; fi) 198 199# Decide whether to build built-in, modular, or both. 200# Normally, just do built-in. 201 202KBUILD_MODULES := 203KBUILD_BUILTIN := 1 204 205# If we have only "make modules", don't compile built-in objects. 206# When we're building modules with modversions, we need to consider 207# the built-in objects during the descend as well, in order to 208# make sure the checksums are uptodate before we record them. 209 210ifeq ($(MAKECMDGOALS),modules) 211 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1) 212endif 213 214# If we have "make <whatever> modules", compile modules 215# in addition to whatever we do anyway. 216# Just "make" or "make all" shall build modules as well 217 218ifneq ($(filter all _all modules,$(MAKECMDGOALS)),) 219 KBUILD_MODULES := 1 220endif 221 222ifeq ($(MAKECMDGOALS),) 223 KBUILD_MODULES := 1 224endif 225 226export KBUILD_MODULES KBUILD_BUILTIN 227export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD 228 229# Beautify output 230# --------------------------------------------------------------------------- 231# 232# Normally, we echo the whole command before executing it. By making 233# that echo $($(quiet)$(cmd)), we now have the possibility to set 234# $(quiet) to choose other forms of output instead, e.g. 235# 236# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@ 237# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< 238# 239# If $(quiet) is empty, the whole command will be printed. 240# If it is set to "quiet_", only the short version will be printed. 241# If it is set to "silent_", nothing wil be printed at all, since 242# the variable $(silent_cmd_cc_o_c) doesn't exist. 243# 244# A simple variant is to prefix commands with $(Q) - that's useful 245# for commands that shall be hidden in non-verbose mode. 246# 247# $(Q)ln $@ :< 248# 249# If KBUILD_VERBOSE equals 0 then the above command will be hidden. 250# If KBUILD_VERBOSE equals 1 then the above command is displayed. 251 252ifeq ($(KBUILD_VERBOSE),1) 253 quiet = 254 Q = 255else 256 quiet=quiet_ 257 Q = @ 258endif 259 260# If the user is running make -s (silent mode), suppress echoing of 261# commands 262 263ifneq ($(findstring s,$(MAKEFLAGS)),) 264 quiet=silent_ 265endif 266 267export quiet Q KBUILD_VERBOSE 268 269 270# Look for make include files relative to root of kernel src 271MAKEFLAGS += --include-dir=$(srctree) 272 273HOSTCC = gcc 274HOSTCXX = g++ 275HOSTCFLAGS := 276HOSTCXXFLAGS := 277# We need some generic definitions 278include $(srctree)/scripts/Kbuild.include 279 280HOSTCFLAGS += $(call hostcc-option,-Wall -Wstrict-prototypes -O2 -fomit-frame-pointer,) 281HOSTCXXFLAGS += -O2 282 283# For maximum performance (+ possibly random breakage, uncomment 284# the following) 285 286MAKEFLAGS += -rR 287 288# Make variables (CC, etc...) 289 290AS = $(CROSS_COMPILE)as 291CC = $(CROSS_COMPILE)gcc 292LD = $(CC) -nostdlib 293CPP = $(CC) -E 294AR = $(CROSS_COMPILE)ar 295NM = $(CROSS_COMPILE)nm 296STRIP = $(CROSS_COMPILE)strip 297OBJCOPY = $(CROSS_COMPILE)objcopy 298OBJDUMP = $(CROSS_COMPILE)objdump 299AWK = awk 300GENKSYMS = scripts/genksyms/genksyms 301DEPMOD = /sbin/depmod 302KALLSYMS = scripts/kallsyms 303PERL = perl 304CHECK = sparse 305 306CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ -Wbitwise $(CF) 307MODFLAGS = -DMODULE 308CFLAGS_MODULE = $(MODFLAGS) 309AFLAGS_MODULE = $(MODFLAGS) 310LDFLAGS_MODULE = -r 311CFLAGS_KERNEL = 312AFLAGS_KERNEL = 313 314 315# Use LINUXINCLUDE when you must reference the include/ directory. 316# Needed to be compatible with the O= option 317CFLAGS := $(CFLAGS) 318# Added only to final link stage of busybox binary 319CFLAGS_busybox := $(CFLAGS_busybox) 320CPPFLAGS := $(CPPFLAGS) 321AFLAGS := $(AFLAGS) 322LDFLAGS := $(LDFLAGS) 323LDLIBS := 324 325# Read KERNELRELEASE from .kernelrelease (if it exists) 326KERNELRELEASE = $(shell cat .kernelrelease 2> /dev/null) 327KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION) 328 329export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION \ 330 ARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC \ 331 CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE \ 332 HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS 333 334export CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS 335export CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 336export AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 337export FLTFLAGS 338 339# When compiling out-of-tree modules, put MODVERDIR in the module 340# tree rather than in the kernel tree. The kernel tree might 341# even be read-only. 342export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions 343 344# Files to ignore in find ... statements 345 346RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS -o -name .pc -o -name .hg -o -name .git \) -prune -o 347export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git 348 349# =========================================================================== 350# Rules shared between *config targets and build targets 351 352# Basic helpers built in scripts/ 353PHONY += scripts_basic 354scripts_basic: 355 $(Q)$(MAKE) $(build)=scripts/basic 356 357# To avoid any implicit rule to kick in, define an empty command. 358scripts/basic/%: scripts_basic ; 359 360PHONY += outputmakefile 361# outputmakefile generates a Makefile in the output directory, if using a 362# separate output directory. This allows convenient use of make in the 363# output directory. 364outputmakefile: 365ifneq ($(KBUILD_SRC),) 366 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \ 367 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL) 368endif 369 370# To make sure we do not include .config for any of the *config targets 371# catch them early, and hand them over to scripts/kconfig/Makefile 372# It is allowed to specify more targets when calling make, including 373# mixing *config targets and build targets. 374# For example 'make oldconfig all'. 375# Detect when mixed targets is specified, and make a second invocation 376# of make so .config is not included in this case either (for *config). 377 378no-dot-config-targets := clean mrproper distclean \ 379 cscope TAGS tags help %docs 380#bbox# check% is removed from above 381 382config-targets := 0 383mixed-targets := 0 384dot-config := 1 385 386ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 387 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 388 dot-config := 0 389 endif 390endif 391 392ifeq ($(KBUILD_EXTMOD),) 393 ifneq ($(filter config %config,$(MAKECMDGOALS)),) 394 config-targets := 1 395 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),) 396 mixed-targets := 1 397 endif 398 endif 399endif 400 401ifeq ($(mixed-targets),1) 402# =========================================================================== 403# We're called with mixed targets (*config and build targets). 404# Handle them one by one. 405 406%:: FORCE 407 $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@ 408 409else 410ifeq ($(config-targets),1) 411# =========================================================================== 412# *config targets only - make sure prerequisites are updated, and descend 413# in scripts/kconfig to make the *config target 414 415# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 416# KBUILD_DEFCONFIG may point out an alternative default configuration 417# used for 'make defconfig' 418-include $(srctree)/arch/$(ARCH)/Makefile 419export KBUILD_DEFCONFIG 420 421config %config: scripts_basic outputmakefile FORCE 422 $(Q)mkdir -p include 423 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 424 $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= .kernelrelease 425 426else 427# =========================================================================== 428# Build targets only - this includes busybox, arch specific targets, clean 429# targets and others. In general all targets except *config targets. 430 431ifeq ($(KBUILD_EXTMOD),) 432# Additional helpers built in scripts/ 433# Carefully list dependencies so we do not try to build scripts twice 434# in parrallel 435PHONY += scripts 436scripts: scripts_basic include/config/MARKER 437 $(Q)$(MAKE) $(build)=$(@) 438 439scripts_basic: include/autoconf.h 440 441# Objects we will link into busybox / subdirs we need to visit 442core-y := \ 443 applets/ \ 444 445libs-y := \ 446 archival/ \ 447 archival/libunarchive/ \ 448 console-tools/ \ 449 coreutils/ \ 450 coreutils/libcoreutils/ \ 451 debianutils/ \ 452 e2fsprogs/ \ 453 editors/ \ 454 findutils/ \ 455 init/ \ 456 libbb/ \ 457 libpwdgrp/ \ 458 loginutils/ \ 459 mailutils/ \ 460 miscutils/ \ 461 modutils/ \ 462 networking/ \ 463 networking/libiproute/ \ 464 networking/udhcp/ \ 465 printutils/ \ 466 procps/ \ 467 runit/ \ 468 selinux/ \ 469 shell/ \ 470 sysklogd/ \ 471 util-linux/ \ 472 util-linux/volume_id/ \ 473 474endif # KBUILD_EXTMOD 475 476ifeq ($(dot-config),1) 477# In this section, we need .config 478 479# Read in dependencies to all Kconfig* files, make sure to run 480# oldconfig if changes are detected. 481-include .kconfig.d 482 483-include .config 484 485# If .config needs to be updated, it will be done via the dependency 486# that autoconf has on .config. 487# To avoid any implicit rule to kick in, define an empty command 488.config .kconfig.d: ; 489 490# Now we can define CFLAGS etc according to .config 491include $(srctree)/Makefile.flags 492 493# If .config is newer than include/autoconf.h, someone tinkered 494# with it and forgot to run make oldconfig. 495# If kconfig.d is missing then we are probarly in a cleaned tree so 496# we execute the config step to be sure to catch updated Kconfig files 497include/autoconf.h: .kconfig.d .config 498 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig 499 500else 501# Dummy target needed, because used as prerequisite 502include/autoconf.h: ; 503endif 504 505# The all: target is the default when no target is given on the 506# command line. 507# This allow a user to issue only 'make' to build a kernel including modules 508# Defaults busybox but it is usually overridden in the arch makefile 509all: busybox doc 510 511-include $(srctree)/arch/$(ARCH)/Makefile 512 513# arch Makefile may override CC so keep this after arch Makefile is included 514#bbox# NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) 515CHECKFLAGS += $(NOSTDINC_FLAGS) 516 517# Default kernel image to build when no specific target is given. 518# KBUILD_IMAGE may be overruled on the commandline or 519# set in the environment 520# Also any assignments in arch/$(ARCH)/Makefile take precedence over 521# this default value 522export KBUILD_IMAGE ?= busybox 523 524# 525# INSTALL_PATH specifies where to place the updated kernel and system map 526# images. Default is /boot, but you can set it to other values 527export INSTALL_PATH ?= /boot 528 529# 530# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 531# relocations required by build roots. This is not defined in the 532# makefile but the arguement can be passed to make if needed. 533# 534 535MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 536export MODLIB 537 538 539ifeq ($(KBUILD_EXTMOD),) 540busybox-dirs := $(patsubst %/,%,$(filter %/, $(core-y) $(core-m) $(libs-y) $(libs-m))) 541 542busybox-alldirs := $(sort $(busybox-dirs) $(patsubst %/,%,$(filter %/, \ 543 $(core-n) $(core-) $(libs-n) $(libs-) \ 544 ))) 545 546core-y := $(patsubst %/, %/built-in.o, $(core-y)) 547libs-y1 := $(patsubst %/, %/lib.a, $(libs-y)) 548libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y)) 549libs-y := $(libs-y1) $(libs-y2) 550 551# Build busybox 552# --------------------------------------------------------------------------- 553# busybox is build from the objects selected by $(busybox-init) and 554# $(busybox-main). Most are built-in.o files from top-level directories 555# in the kernel tree, others are specified in arch/$(ARCH)Makefile. 556# Ordering when linking is important, and $(busybox-init) must be first. 557# 558# busybox 559# ^ 560# | 561# +-< $(busybox-init) 562# | +--< init/version.o + more 563# | 564# +--< $(busybox-main) 565# | +--< driver/built-in.o mm/built-in.o + more 566# | 567# +-< kallsyms.o (see description in CONFIG_KALLSYMS section) 568# 569# busybox version (uname -v) cannot be updated during normal 570# descending-into-subdirs phase since we do not yet know if we need to 571# update busybox. 572# Therefore this step is delayed until just before final link of busybox - 573# except in the kallsyms case where it is done just before adding the 574# symbols to the kernel. 575# 576# System.map is generated to document addresses of all kernel symbols 577 578busybox-all := $(core-y) $(libs-y) 579 580# Rule to link busybox - also used during CONFIG_KALLSYMS 581# May be overridden by arch/$(ARCH)/Makefile 582quiet_cmd_busybox__ ?= LINK $@ 583 cmd_busybox__ ?= $(srctree)/scripts/trylink \ 584 "$@" \ 585 "$(CC)" \ 586 "$(CFLAGS) $(CFLAGS_busybox)" \ 587 "$(LDFLAGS) $(EXTRA_LDFLAGS)" \ 588 "$(core-y)" \ 589 "$(libs-y)" \ 590 "$(LDLIBS)" 591 592# Generate System.map 593quiet_cmd_sysmap = SYSMAP 594 cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap 595 596# Link of busybox 597# If CONFIG_KALLSYMS is set .version is already updated 598# Generate System.map and verify that the content is consistent 599# Use + in front of the busybox_version rule to silent warning with make -j2 600# First command is ':' to allow us to use + in front of the rule 601define rule_busybox__ 602 : 603 $(call cmd,busybox__) 604 $(Q)echo 'cmd_$@ := $(cmd_busybox__)' > $(@D)/.$(@F).cmd 605endef 606 607 608ifdef CONFIG_KALLSYMS 609# Generate section listing all symbols and add it into busybox $(kallsyms.o) 610# It's a three stage process: 611# o .tmp_busybox1 has all symbols and sections, but __kallsyms is 612# empty 613# Running kallsyms on that gives us .tmp_kallsyms1.o with 614# the right size - busybox version (uname -v) is updated during this step 615# o .tmp_busybox2 now has a __kallsyms section of the right size, 616# but due to the added section, some addresses have shifted. 617# From here, we generate a correct .tmp_kallsyms2.o 618# o The correct .tmp_kallsyms2.o is linked into the final busybox. 619# o Verify that the System.map from busybox matches the map from 620# .tmp_busybox2, just in case we did not generate kallsyms correctly. 621# o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using 622# .tmp_busybox3 and .tmp_kallsyms3.o. This is only meant as a 623# temporary bypass to allow the kernel to be built while the 624# maintainers work out what went wrong with kallsyms. 625 626ifdef CONFIG_KALLSYMS_EXTRA_PASS 627last_kallsyms := 3 628else 629last_kallsyms := 2 630endif 631 632kallsyms.o := .tmp_kallsyms$(last_kallsyms).o 633 634define verify_kallsyms 635 $(Q)$(if $($(quiet)cmd_sysmap), \ 636 echo ' $($(quiet)cmd_sysmap) .tmp_System.map' &&) \ 637 $(cmd_sysmap) .tmp_busybox$(last_kallsyms) .tmp_System.map 638 $(Q)cmp -s System.map .tmp_System.map || \ 639 (echo Inconsistent kallsyms data; \ 640 echo Try setting CONFIG_KALLSYMS_EXTRA_PASS; \ 641 rm .tmp_kallsyms* ; /bin/false ) 642endef 643 644# Update busybox version before link 645# Use + in front of this rule to silent warning about make -j1 646# First command is ':' to allow us to use + in front of this rule 647cmd_ksym_ld = $(cmd_busybox__) 648define rule_ksym_ld 649 : 650 +$(call cmd,busybox_version) 651 $(call cmd,busybox__) 652 $(Q)echo 'cmd_$@ := $(cmd_busybox__)' > $(@D)/.$(@F).cmd 653endef 654 655# Generate .S file with all kernel symbols 656quiet_cmd_kallsyms = KSYM $@ 657 cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \ 658 $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@ 659 660.tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE 661 $(call if_changed_dep,as_o_S) 662 663.tmp_kallsyms%.S: .tmp_busybox% $(KALLSYMS) 664 $(call cmd,kallsyms) 665 666# .tmp_busybox1 must be complete except kallsyms, so update busybox version 667.tmp_busybox1: $(busybox-lds) $(busybox-all) FORCE 668 $(call if_changed_rule,ksym_ld) 669 670.tmp_busybox2: $(busybox-lds) $(busybox-all) .tmp_kallsyms1.o FORCE 671 $(call if_changed,busybox__) 672 673.tmp_busybox3: $(busybox-lds) $(busybox-all) .tmp_kallsyms2.o FORCE 674 $(call if_changed,busybox__) 675 676# Needs to visit scripts/ before $(KALLSYMS) can be used. 677$(KALLSYMS): scripts ; 678 679# Generate some data for debugging strange kallsyms problems 680debug_kallsyms: .tmp_map$(last_kallsyms) 681 682.tmp_map%: .tmp_busybox% FORCE 683 ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@ 684 685.tmp_map3: .tmp_map2 686 687.tmp_map2: .tmp_map1 688 689endif # ifdef CONFIG_KALLSYMS 690 691# busybox image - including updated kernel symbols 692busybox_unstripped: $(busybox-all) FORCE 693 $(call if_changed_rule,busybox__) 694 $(Q)rm -f .old_version 695 696busybox: busybox_unstripped 697ifeq ($(SKIP_STRIP),y) 698 $(Q)cp $< $@ 699else 700 $(Q)$(STRIP) -s --remove-section=.note --remove-section=.comment \ 701 busybox_unstripped -o $@ 702# strip is confused by PIE executable and does not set exec bits 703 $(Q)chmod a+x $@ 704endif 705 706# The actual objects are generated when descending, 707# make sure no implicit rule kicks in 708$(sort $(busybox-all)): $(busybox-dirs) ; 709 710# Handle descending into subdirectories listed in $(busybox-dirs) 711# Preset locale variables to speed up the build process. Limit locale 712# tweaks to this spot to avoid wrong language settings when running 713# make menuconfig etc. 714# Error messages still appears in the original language 715 716PHONY += $(busybox-dirs) 717$(busybox-dirs): prepare scripts 718 $(Q)$(MAKE) $(build)=$@ 719 720# Build the kernel release string 721# The KERNELRELEASE is stored in a file named .kernelrelease 722# to be used when executing for example make install or make modules_install 723# 724# Take the contents of any files called localversion* and the config 725# variable CONFIG_LOCALVERSION and append them to KERNELRELEASE. 726# LOCALVERSION from the command line override all of this 727 728nullstring := 729space := $(nullstring) # end of line 730 731___localver = $(objtree)/localversion* $(srctree)/localversion* 732__localver = $(sort $(wildcard $(___localver))) 733# skip backup files (containing '~') 734_localver = $(foreach f, $(__localver), $(if $(findstring ~, $(f)),,$(f))) 735 736localver = $(subst $(space),, \ 737 $(shell cat /dev/null $(_localver)) \ 738 $(patsubst "%",%,$(CONFIG_LOCALVERSION))) 739 740# If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called 741# and if the SCM is know a tag from the SCM is appended. 742# The appended tag is determinded by the SCM used. 743# 744# Currently, only git is supported. 745# Other SCMs can edit scripts/setlocalversion and add the appropriate 746# checks as needed. 747ifdef _BB_DISABLED_CONFIG_LOCALVERSION_AUTO 748 _localver-auto = $(shell $(CONFIG_SHELL) \ 749 $(srctree)/scripts/setlocalversion $(srctree)) 750 localver-auto = $(LOCALVERSION)$(_localver-auto) 751endif 752 753localver-full = $(localver)$(localver-auto) 754 755# Store (new) KERNELRELASE string in .kernelrelease 756kernelrelease = $(KERNELVERSION)$(localver-full) 757.kernelrelease: FORCE 758 $(Q)rm -f $@ 759 $(Q)echo $(kernelrelease) > $@ 760 761 762# Things we need to do before we recursively start building the kernel 763# or the modules are listed in "prepare". 764# A multi level approach is used. prepareN is processed before prepareN-1. 765# archprepare is used in arch Makefiles and when processed asm symlink, 766# version.h and scripts_basic is processed / created. 767 768# Listed in dependency order 769PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3 770 771# prepare-all is deprecated, use prepare as valid replacement 772PHONY += prepare-all 773 774# prepare3 is used to check if we are building in a separate output directory, 775# and if so do: 776# 1) Check that make has not been executed in the kernel src $(srctree) 777# 2) Create the include2 directory, used for the second asm symlink 778prepare3: .kernelrelease 779ifneq ($(KBUILD_SRC),) 780 @echo ' Using $(srctree) as source for busybox' 781 $(Q)if [ -f $(srctree)/.config ]; then \ 782 echo " $(srctree) is not clean, please run 'make mrproper'";\ 783 echo " in the '$(srctree)' directory.";\ 784 /bin/false; \ 785 fi; 786 $(Q)if [ ! -d include2 ]; then mkdir -p include2; fi; 787 $(Q)ln -fsn $(srctree)/include/asm-$(ARCH) include2/asm 788endif 789 790# prepare2 creates a makefile if using a separate output directory 791prepare2: prepare3 outputmakefile 792 793prepare1: prepare2 include/config/MARKER 794ifneq ($(KBUILD_MODULES),) 795 $(Q)mkdir -p $(MODVERDIR) 796 $(Q)rm -f $(MODVERDIR)/* 797endif 798 799archprepare: prepare1 scripts_basic 800 801prepare0: archprepare FORCE 802 $(Q)$(MAKE) $(build)=. 803 804# All the preparing.. 805prepare prepare-all: prepare0 806 807# Leave this as default for preprocessing busybox.lds.S, which is now 808# done in arch/$(ARCH)/kernel/Makefile 809 810export CPPFLAGS_busybox.lds += -P -C -U$(ARCH) 811 812# FIXME: The asm symlink changes when $(ARCH) changes. That's 813# hard to detect, but I suppose "make mrproper" is a good idea 814# before switching between archs anyway. 815 816#bbox# include/asm: 817#bbox# @echo ' SYMLINK $@ -> include/asm-$(ARCH)' 818#bbox# $(Q)if [ ! -d include ]; then mkdir -p include; fi; 819#bbox# @ln -fsn asm-$(ARCH) $@ 820 821# Split autoconf.h into include/linux/config/* 822quiet_cmd_gen_bbconfigopts = GEN include/bbconfigopts.h 823 cmd_gen_bbconfigopts = $(srctree)/scripts/mkconfigs > include/bbconfigopts.h 824quiet_cmd_split_autoconf = SPLIT include/autoconf.h -> include/config/* 825 cmd_split_autoconf = scripts/basic/split-include include/autoconf.h include/config 826#bbox# piggybacked generation of few .h files 827include/config/MARKER: scripts/basic/split-include include/autoconf.h 828 $(call cmd,split_autoconf) 829 $(call cmd,gen_bbconfigopts) 830 @touch $@ 831 832# Generate some files 833# --------------------------------------------------------------------------- 834 835# KERNELRELEASE can change from a few different places, meaning version.h 836# needs to be updated, so this check is forced on all builds 837 838uts_len := 64 839 840define filechk_version.h 841 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 842 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 843 exit 1; \ 844 fi; \ 845 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"; \ 846 echo \#define LINUX_VERSION_CODE `expr $(VERSION) \\* 65536 + $(PATCHLEVEL) \\* 256 + $(SUBLEVEL)`; \ 847 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'; \ 848 ) 849endef 850 851# --------------------------------------------------------------------------- 852 853PHONY += depend dep 854depend dep: 855 @echo '*** Warning: make $@ is unnecessary now.' 856 857# --------------------------------------------------------------------------- 858# Modules 859 860ifdef _BB_DISABLED_CONFIG_MODULES 861 862# By default, build modules as well 863 864all: modules 865 866# Build modules 867 868PHONY += modules 869modules: $(busybox-dirs) $(if $(KBUILD_BUILTIN),busybox) 870 @echo ' Building modules, stage 2.'; 871 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost 872 873 874# Target to prepare building external modules 875PHONY += modules_prepare 876modules_prepare: prepare scripts 877 878# Target to install modules 879PHONY += modules_install 880modules_install: _modinst_ _modinst_post 881 882PHONY += _modinst_ 883_modinst_: 884 @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \ 885 echo "Warning: you may need to install module-init-tools"; \ 886 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\ 887 sleep 1; \ 888 fi 889 @rm -rf $(MODLIB)/kernel 890 @rm -f $(MODLIB)/source 891 @mkdir -p $(MODLIB)/kernel 892 @ln -s $(srctree) $(MODLIB)/source 893 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 894 rm -f $(MODLIB)/build ; \ 895 ln -s $(objtree) $(MODLIB)/build ; \ 896 fi 897 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modinst 898 899# If System.map exists, run depmod. This deliberately does not have a 900# dependency on System.map since that would run the dependency tree on 901# busybox. This depmod is only for convenience to give the initial 902# boot a modules.dep even before / is mounted read-write. However the 903# boot script depmod is the master version. 904ifeq "$(strip $(INSTALL_MOD_PATH))" "" 905depmod_opts := 906else 907depmod_opts := -b $(INSTALL_MOD_PATH) -r 908endif 909PHONY += _modinst_post 910_modinst_post: _modinst_ 911 if [ -r System.map -a -x $(DEPMOD) ]; then $(DEPMOD) -ae -F System.map $(depmod_opts) $(KERNELRELEASE); fi 912 913else # CONFIG_MODULES 914 915# Modules not configured 916# --------------------------------------------------------------------------- 917 918modules modules_install: FORCE 919 @echo 920 @echo "The present busybox configuration has modules disabled." 921 @echo "Type 'make config' and enable loadable module support." 922 @echo "Then build a kernel with module support enabled." 923 @echo 924 @exit 1 925 926endif # CONFIG_MODULES 927 928### 929# Cleaning is done on three levels. 930# make clean Delete most generated files 931# Leave enough to build external modules 932# make mrproper Delete the current configuration, and all generated files 933# make distclean Remove editor backup files, patch leftover files and the like 934 935# Directories & files removed with 'make clean' 936CLEAN_DIRS += $(MODVERDIR) _install 0_lib 937CLEAN_FILES += busybox busybox_unstripped* busybox.links \ 938 System.map .kernelrelease \ 939 .tmp_kallsyms* .tmp_version .tmp_busybox* .tmp_System.map 940 941# Directories & files removed with 'make mrproper' 942MRPROPER_DIRS += include/config include2 943MRPROPER_FILES += .config .config.old include/asm .version .old_version \ 944 include/autoconf.h \ 945 include/bbconfigopts.h \ 946 include/usage_compressed.h \ 947 include/applet_tables.h \ 948 applets/usage \ 949 .kernelrelease Module.symvers tags TAGS cscope* \ 950 busybox_old 951 952# clean - Delete most, but leave enough to build external modules 953# 954clean: rm-dirs := $(CLEAN_DIRS) 955clean: rm-files := $(CLEAN_FILES) 956clean-dirs := $(addprefix _clean_,$(srctree) $(busybox-alldirs)) 957 958PHONY += $(clean-dirs) clean archclean 959$(clean-dirs): 960 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 961 962clean: archclean $(clean-dirs) 963 $(call cmd,rmdirs) 964 $(call cmd,rmfiles) 965 @find . $(RCS_FIND_IGNORE) \ 966 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \ 967 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \ 968 -type f -print | xargs rm -f 969 970PHONY += doc-clean 971doc-clean: rm-files := docs/busybox.pod \ 972 docs/BusyBox.html docs/BusyBox.1 docs/BusyBox.txt 973doc-clean: 974 $(call cmd,rmfiles) 975 976# mrproper - Delete all generated files, including .config 977# 978mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS)) 979mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 980mrproper-dirs := $(addprefix _mrproper_,scripts) 981 982PHONY += $(mrproper-dirs) mrproper archmrproper 983$(mrproper-dirs): 984 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 985 986mrproper: clean archmrproper $(mrproper-dirs) 987 $(call cmd,rmdirs) 988 $(call cmd,rmfiles) 989 990# distclean 991# 992PHONY += distclean 993 994distclean: mrproper 995 @find $(srctree) $(RCS_FIND_IGNORE) \ 996 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 997 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \ 998 -o -name '.*.rej' -o -name '*.tmp' -o -size 0 \ 999 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \ 1000 -type f -print | xargs rm -f
1001 1002 1003# Packaging of the kernel to various formats 1004# --------------------------------------------------------------------------- 1005# rpm target kept for backward compatibility 1006package-dir := $(srctree)/scripts/package 1007 1008%pkg: FORCE 1009 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1010rpm: FORCE 1011 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1012 1013 1014# Brief documentation of the typical targets used 1015# --------------------------------------------------------------------------- 1016 1017boards := $(wildcard $(srctree)/arch/$(ARCH)/configs/*_defconfig) 1018boards := $(notdir $(boards)) 1019 1020-include $(srctree)/Makefile.help 1021 1022# Documentation targets 1023# --------------------------------------------------------------------------- 1024%docs: scripts_basic FORCE 1025 $(Q)$(MAKE) $(build)=Documentation/DocBook $@ 1026 1027else # KBUILD_EXTMOD 1028 1029### 1030# External module support. 1031# When building external modules the kernel used as basis is considered 1032# read-only, and no consistency checks are made and the make 1033# system is not used on the basis kernel. If updates are required 1034# in the basis kernel ordinary make commands (without M=...) must 1035# be used. 1036# 1037# The following are the only valid targets when building external 1038# modules. 1039# make M=dir clean Delete all automatically generated files 1040# make M=dir modules Make all modules in specified dir 1041# make M=dir Same as 'make M=dir modules' 1042# make M=dir modules_install 1043# Install the modules build in the module directory 1044# Assumes install directory is already created 1045 1046# We are always building modules 1047KBUILD_MODULES := 1 1048PHONY += crmodverdir 1049crmodverdir: 1050 $(Q)mkdir -p $(MODVERDIR) 1051 $(Q)rm -f $(MODVERDIR)/* 1052 1053PHONY += $(objtree)/Module.symvers 1054$(objtree)/Module.symvers: 1055 @test -e $(objtree)/Module.symvers || ( \ 1056 echo; \ 1057 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \ 1058 echo " is missing; modules will have no dependencies and modversions."; \ 1059 echo ) 1060 1061module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD)) 1062PHONY += $(module-dirs) modules 1063$(module-dirs): crmodverdir $(objtree)/Module.symvers 1064 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@) 1065 1066modules: $(module-dirs) 1067 @echo ' Building modules, stage 2.'; 1068 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost 1069 1070PHONY += modules_install 1071modules_install: _emodinst_ _emodinst_post 1072 1073install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra) 1074PHONY += _emodinst_ 1075_emodinst_: 1076 $(Q)mkdir -p $(MODLIB)/$(install-dir) 1077 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modinst 1078 1079# Run depmod only is we have System.map and depmod is executable 1080quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) 1081 cmd_depmod = if [ -r System.map -a -x $(DEPMOD) ]; then \ 1082 $(DEPMOD) -ae -F System.map \ 1083 $(if $(strip $(INSTALL_MOD_PATH)), \ 1084 -b $(INSTALL_MOD_PATH) -r) \ 1085 $(KERNELRELEASE); \ 1086 fi 1087 1088PHONY += _emodinst_post 1089_emodinst_post: _emodinst_ 1090 $(call cmd,depmod) 1091 1092clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD)) 1093 1094PHONY += $(clean-dirs) clean 1095$(clean-dirs): 1096 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1097 1098clean: rm-dirs := $(MODVERDIR) 1099clean: $(clean-dirs) 1100 $(call cmd,rmdirs) 1101 @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \ 1102 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \ 1103 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \ 1104 -type f -print | xargs rm -f 1105 1106help: 1107 @echo ' Building external modules.' 1108 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1109 @echo '' 1110 @echo ' modules - default target, build the module(s)' 1111 @echo ' modules_install - install the module' 1112 @echo ' clean - remove generated files in module directory only' 1113 @echo '' 1114 1115# Dummies... 1116PHONY += prepare scripts 1117prepare: ; 1118scripts: ; 1119endif # KBUILD_EXTMOD 1120 1121# Generate tags for editors 1122# --------------------------------------------------------------------------- 1123 1124#We want __srctree to totally vanish out when KBUILD_OUTPUT is not set 1125#(which is the most common case IMHO) to avoid unneeded clutter in the big tags file. 1126#Adding $(srctree) adds about 20M on i386 to the size of the output file! 1127 1128ifeq ($(src),$(obj)) 1129__srctree = 1130else 1131__srctree = $(srctree)/ 1132endif 1133 1134ifeq ($(ALLSOURCE_ARCHS),) 1135ifeq ($(ARCH),um) 1136ALLINCLUDE_ARCHS := $(ARCH) $(SUBARCH) 1137else 1138ALLINCLUDE_ARCHS := $(ARCH) 1139endif 1140else 1141#Allow user to specify only ALLSOURCE_PATHS on the command line, keeping existing behaviour. 1142ALLINCLUDE_ARCHS := $(ALLSOURCE_ARCHS) 1143endif 1144 1145ALLSOURCE_ARCHS := $(ARCH) 1146 1147define all-sources 1148 ( find $(__srctree) $(RCS_FIND_IGNORE) \ 1149 \( -name include -o -name arch \) -prune -o \ 1150 -name '*.[chS]' -print; \ 1151 for ARCH in $(ALLSOURCE_ARCHS) ; do \ 1152 find $(__srctree)arch/$${ARCH} $(RCS_FIND_IGNORE) \ 1153 -name '*.[chS]' -print; \ 1154 done ; \ 1155 find $(__srctree)security/selinux/include $(RCS_FIND_IGNORE) \ 1156 -name '*.[chS]' -print; \ 1157 find $(__srctree)include $(RCS_FIND_IGNORE) \ 1158 \( -name config -o -name 'asm-*' \) -prune \ 1159 -o -name '*.[chS]' -print; \ 1160 for ARCH in $(ALLINCLUDE_ARCHS) ; do \ 1161 find $(__srctree)include/asm-$${ARCH} $(RCS_FIND_IGNORE) \ 1162 -name '*.[chS]' -print; \ 1163 done ; \ 1164 find $(__srctree)include/asm-generic $(RCS_FIND_IGNORE) \ 1165 -name '*.[chS]' -print ) 1166endef 1167 1168quiet_cmd_cscope-file = FILELST cscope.files 1169 cmd_cscope-file = (echo \-k; echo \-q; $(all-sources)) > cscope.files 1170 1171quiet_cmd_cscope = MAKE cscope.out 1172 cmd_cscope = cscope -b 1173 1174cscope: FORCE 1175 $(call cmd,cscope-file) 1176 $(call cmd,cscope) 1177 1178quiet_cmd_TAGS = MAKE $@ 1179define cmd_TAGS 1180 rm -f $@; \ 1181 ETAGSF=`etags --version | grep -i exuberant >/dev/null && \ 1182 echo "-I __initdata,__exitdata,__acquires,__releases \ 1183 -I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL \ 1184 --extra=+f --c-kinds=+px"`; \ 1185 $(all-sources) | xargs etags $$ETAGSF -a 1186endef 1187 1188TAGS: FORCE 1189 $(call cmd,TAGS) 1190 1191 1192quiet_cmd_tags = MAKE $@ 1193define cmd_tags 1194 rm -f $@; \ 1195 CTAGSF=`ctags --version | grep -i exuberant >/dev/null && \ 1196 echo "-I __initdata,__exitdata,__acquires,__releases \ 1197 -I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL \ 1198 --extra=+f --c-kinds=+px"`; \ 1199 $(all-sources) | xargs ctags $$CTAGSF -a 1200endef 1201 1202tags: FORCE 1203 $(call cmd,tags) 1204 1205 1206# Scripts to check various things for consistency 1207# --------------------------------------------------------------------------- 1208 1209includecheck: 1210 find * $(RCS_FIND_IGNORE) \ 1211 -name '*.[hcS]' -type f -print | sort \ 1212 | xargs $(PERL) -w scripts/checkincludes.pl 1213 1214versioncheck: 1215 find * $(RCS_FIND_IGNORE) \ 1216 -name '*.[hcS]' -type f -print | sort \ 1217 | xargs $(PERL) -w scripts/checkversion.pl 1218 1219namespacecheck: 1220 $(PERL) $(srctree)/scripts/namespace.pl 1221 1222endif #ifeq ($(config-targets),1) 1223endif #ifeq ($(mixed-targets),1) 1224 1225PHONY += checkstack 1226checkstack: 1227 $(OBJDUMP) -d busybox $$(find . -name '*.ko') | \ 1228 $(PERL) $(src)/scripts/checkstack.pl $(ARCH) 1229 1230kernelrelease: 1231 $(if $(wildcard .kernelrelease), $(Q)echo $(KERNELRELEASE), \ 1232 $(error kernelrelease not valid - run 'make *config' to update it)) 1233kernelversion: 1234 @echo $(KERNELVERSION) 1235 1236# Single targets 1237# --------------------------------------------------------------------------- 1238# Single targets are compatible with: 1239# - build whith mixed source and output 1240# - build with separate output dir 'make O=...' 1241# - external modules 1242# 1243# target-dir => where to store outputfile 1244# build-dir => directory in kernel source tree to use 1245 1246ifeq ($(KBUILD_EXTMOD),) 1247 build-dir = $(patsubst %/,%,$(dir $@)) 1248 target-dir = $(dir $@) 1249else 1250 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@))) 1251 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash)) 1252 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@)) 1253endif 1254 1255%.s: %.c prepare scripts FORCE 1256 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1257%.i: %.c prepare scripts FORCE 1258 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1259%.o: %.c prepare scripts FORCE 1260 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1261%.lst: %.c prepare scripts FORCE 1262 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1263%.s: %.S prepare scripts FORCE 1264 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1265%.o: %.S prepare scripts FORCE 1266 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1267 1268# Modules 1269/ %/: prepare scripts FORCE 1270 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1271 $(build)=$(build-dir) 1272%.ko: prepare scripts FORCE 1273 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1274 $(build)=$(build-dir) $(@:.ko=.o) 1275 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost 1276 1277# FIXME Should go into a make.lib or something 1278# =========================================================================== 1279 1280quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs))) 1281 cmd_rmdirs = rm -rf $(rm-dirs) 1282 1283quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1284 cmd_rmfiles = rm -f $(rm-files) 1285 1286 1287a_flags = -Wp,-MD,$(depfile) $(AFLAGS) $(AFLAGS_KERNEL) \ 1288 $(NOSTDINC_FLAGS) $(CPPFLAGS) \ 1289 $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(*F).o) 1290 1291quiet_cmd_as_o_S = AS $@ 1292cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $< 1293 1294# read all saved command lines 1295 1296targets := $(wildcard $(sort $(targets))) 1297cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd)) 1298 1299ifneq ($(cmd_files),) 1300 $(cmd_files): ; # Do not try to update included dependency files 1301 include $(cmd_files) 1302endif 1303 1304# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir 1305# Usage: 1306# $(Q)$(MAKE) $(clean)=dir 1307clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj 1308 1309endif # skip-makefile 1310 1311PHONY += FORCE 1312FORCE: 1313 1314-include $(srctree)/Makefile.custom 1315 1316# Declare the contents of the .PHONY variable as phony. We keep that 1317# information in a variable se we can use it in if_changed and friends. 1318.PHONY: $(PHONY) 1319