1VERSION = 1 2PATCHLEVEL = 18 3SUBLEVEL = 2 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 ; 360 361# This target generates Kbuild's and Config.in's from *.c files 362PHONY += gen_build_files 363gen_build_files: $(wildcard $(srctree)/*/*.c) $(wildcard $(srctree)/*/*/*.c) 364 $(Q)$(srctree)/scripts/gen_build_files.sh $(srctree) $(objtree) 365 366# bbox: we have helpers in applets/ 367# we depend on scripts_basic, since scripts/basic/fixdep 368# must be built before any other host prog 369PHONY += applets_dir 370applets_dir: scripts_basic gen_build_files 371 $(Q)$(MAKE) $(build)=applets 372 373applets/%: applets_dir ; 374 375PHONY += outputmakefile 376# outputmakefile generates a Makefile in the output directory, if using a 377# separate output directory. This allows convenient use of make in the 378# output directory. 379outputmakefile: 380ifneq ($(KBUILD_SRC),) 381 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \ 382 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL) 383endif 384 385# To make sure we do not include .config for any of the *config targets 386# catch them early, and hand them over to scripts/kconfig/Makefile 387# It is allowed to specify more targets when calling make, including 388# mixing *config targets and build targets. 389# For example 'make oldconfig all'. 390# Detect when mixed targets is specified, and make a second invocation 391# of make so .config is not included in this case either (for *config). 392 393no-dot-config-targets := clean mrproper distclean \ 394 cscope TAGS tags help %docs 395#bbox# check% is removed from above 396 397config-targets := 0 398mixed-targets := 0 399dot-config := 1 400 401ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 402 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 403 dot-config := 0 404 endif 405endif 406 407ifeq ($(KBUILD_EXTMOD),) 408 ifneq ($(filter config %config,$(MAKECMDGOALS)),) 409 config-targets := 1 410 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),) 411 mixed-targets := 1 412 endif 413 endif 414endif 415 416ifeq ($(mixed-targets),1) 417# =========================================================================== 418# We're called with mixed targets (*config and build targets). 419# Handle them one by one. 420 421%:: FORCE 422 $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@ 423 424else 425ifeq ($(config-targets),1) 426# =========================================================================== 427# *config targets only - make sure prerequisites are updated, and descend 428# in scripts/kconfig to make the *config target 429 430# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 431# KBUILD_DEFCONFIG may point out an alternative default configuration 432# used for 'make defconfig' 433-include $(srctree)/arch/$(ARCH)/Makefile 434export KBUILD_DEFCONFIG 435 436config: scripts_basic outputmakefile gen_build_files FORCE 437 $(Q)mkdir -p include 438 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 439 $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= .kernelrelease 440 441%config: scripts_basic outputmakefile gen_build_files FORCE 442 $(Q)mkdir -p include 443 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 444 $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= .kernelrelease 445 446else 447# =========================================================================== 448# Build targets only - this includes busybox, arch specific targets, clean 449# targets and others. In general all targets except *config targets. 450 451ifeq ($(KBUILD_EXTMOD),) 452# Additional helpers built in scripts/ 453# Carefully list dependencies so we do not try to build scripts twice 454# in parallel 455PHONY += scripts 456scripts: gen_build_files scripts_basic include/config/MARKER 457 $(Q)$(MAKE) $(build)=$(@) 458 459scripts_basic: include/autoconf.h 460 461# Objects we will link into busybox / subdirs we need to visit 462core-y := \ 463 applets/ \ 464 465libs-y := \ 466 archival/ \ 467 archival/libarchive/ \ 468 console-tools/ \ 469 coreutils/ \ 470 coreutils/libcoreutils/ \ 471 debianutils/ \ 472 e2fsprogs/ \ 473 editors/ \ 474 findutils/ \ 475 init/ \ 476 libbb/ \ 477 libpwdgrp/ \ 478 loginutils/ \ 479 mailutils/ \ 480 miscutils/ \ 481 modutils/ \ 482 networking/ \ 483 networking/libiproute/ \ 484 networking/udhcp/ \ 485 printutils/ \ 486 procps/ \ 487 runit/ \ 488 selinux/ \ 489 shell/ \ 490 sysklogd/ \ 491 util-linux/ \ 492 util-linux/volume_id/ \ 493 494endif # KBUILD_EXTMOD 495 496ifeq ($(dot-config),1) 497# In this section, we need .config 498 499# Read in dependencies to all Kconfig* files, make sure to run 500# oldconfig if changes are detected. 501-include .kconfig.d 502 503-include .config 504 505# If .config needs to be updated, it will be done via the dependency 506# that autoconf has on .config. 507# To avoid any implicit rule to kick in, define an empty command 508.config .kconfig.d: ; 509 510# Now we can define CFLAGS etc according to .config 511include $(srctree)/Makefile.flags 512 513# If .config is newer than include/autoconf.h, someone tinkered 514# with it and forgot to run make oldconfig. 515# If kconfig.d is missing then we are probarly in a cleaned tree so 516# we execute the config step to be sure to catch updated Kconfig files 517include/autoconf.h: .kconfig.d .config $(wildcard $(srctree)/*/*.c) $(wildcard $(srctree)/*/*/*.c) | gen_build_files 518 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig 519 520include/usage.h: gen_build_files 521 522else 523# Dummy target needed, because used as prerequisite 524include/autoconf.h: ; 525endif 526 527# The all: target is the default when no target is given on the 528# command line. 529# This allow a user to issue only 'make' to build a kernel including modules 530# Defaults busybox but it is usually overridden in the arch makefile 531all: busybox doc 532 533-include $(srctree)/arch/$(ARCH)/Makefile 534 535# arch Makefile may override CC so keep this after arch Makefile is included 536#bbox# NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) 537CHECKFLAGS += $(NOSTDINC_FLAGS) 538 539# Default kernel image to build when no specific target is given. 540# KBUILD_IMAGE may be overruled on the commandline or 541# set in the environment 542# Also any assignments in arch/$(ARCH)/Makefile take precedence over 543# this default value 544export KBUILD_IMAGE ?= busybox 545 546# 547# INSTALL_PATH specifies where to place the updated kernel and system map 548# images. Default is /boot, but you can set it to other values 549export INSTALL_PATH ?= /boot 550 551# 552# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 553# relocations required by build roots. This is not defined in the 554# makefile but the arguement can be passed to make if needed. 555# 556 557MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 558export MODLIB 559 560 561ifeq ($(KBUILD_EXTMOD),) 562busybox-dirs := $(patsubst %/,%,$(filter %/, $(core-y) $(core-m) $(libs-y) $(libs-m))) 563 564busybox-alldirs := $(sort $(busybox-dirs) $(patsubst %/,%,$(filter %/, \ 565 $(core-n) $(core-) $(libs-n) $(libs-) \ 566 ))) 567 568core-y := $(patsubst %/, %/built-in.o, $(core-y)) 569libs-y1 := $(patsubst %/, %/lib.a, $(libs-y)) 570libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y)) 571libs-y := $(libs-y1) $(libs-y2) 572 573# Build busybox 574# --------------------------------------------------------------------------- 575# busybox is build from the objects selected by $(busybox-init) and 576# $(busybox-main). Most are built-in.o files from top-level directories 577# in the kernel tree, others are specified in arch/$(ARCH)Makefile. 578# Ordering when linking is important, and $(busybox-init) must be first. 579# 580# busybox 581# ^ 582# | 583# +-< $(busybox-init) 584# | +--< init/version.o + more 585# | 586# +--< $(busybox-main) 587# | +--< driver/built-in.o mm/built-in.o + more 588# | 589# +-< kallsyms.o (see description in CONFIG_KALLSYMS section) 590# 591# busybox version (uname -v) cannot be updated during normal 592# descending-into-subdirs phase since we do not yet know if we need to 593# update busybox. 594# Therefore this step is delayed until just before final link of busybox - 595# except in the kallsyms case where it is done just before adding the 596# symbols to the kernel. 597# 598# System.map is generated to document addresses of all kernel symbols 599 600busybox-all := $(core-y) $(libs-y) 601 602# Rule to link busybox - also used during CONFIG_KALLSYMS 603# May be overridden by arch/$(ARCH)/Makefile 604quiet_cmd_busybox__ ?= LINK $@ 605 cmd_busybox__ ?= $(srctree)/scripts/trylink \ 606 "$@" \ 607 "$(CC)" \ 608 "$(CFLAGS) $(CFLAGS_busybox)" \ 609 "$(LDFLAGS) $(EXTRA_LDFLAGS)" \ 610 "$(core-y)" \ 611 "$(libs-y)" \ 612 "$(LDLIBS)" 613 614# Generate System.map 615quiet_cmd_sysmap = SYSMAP 616 cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap 617 618# Link of busybox 619# If CONFIG_KALLSYMS is set .version is already updated 620# Generate System.map and verify that the content is consistent 621# Use + in front of the busybox_version rule to silent warning with make -j2 622# First command is ':' to allow us to use + in front of the rule 623define rule_busybox__ 624 : 625 $(call cmd,busybox__) 626 $(Q)echo 'cmd_$@ := $(cmd_busybox__)' > $(@D)/.$(@F).cmd 627endef 628 629 630ifdef CONFIG_KALLSYMS 631# Generate section listing all symbols and add it into busybox $(kallsyms.o) 632# It's a three stage process: 633# o .tmp_busybox1 has all symbols and sections, but __kallsyms is 634# empty 635# Running kallsyms on that gives us .tmp_kallsyms1.o with 636# the right size - busybox version (uname -v) is updated during this step 637# o .tmp_busybox2 now has a __kallsyms section of the right size, 638# but due to the added section, some addresses have shifted. 639# From here, we generate a correct .tmp_kallsyms2.o 640# o The correct .tmp_kallsyms2.o is linked into the final busybox. 641# o Verify that the System.map from busybox matches the map from 642# .tmp_busybox2, just in case we did not generate kallsyms correctly. 643# o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using 644# .tmp_busybox3 and .tmp_kallsyms3.o. This is only meant as a 645# temporary bypass to allow the kernel to be built while the 646# maintainers work out what went wrong with kallsyms. 647 648ifdef CONFIG_KALLSYMS_EXTRA_PASS 649last_kallsyms := 3 650else 651last_kallsyms := 2 652endif 653 654kallsyms.o := .tmp_kallsyms$(last_kallsyms).o 655 656define verify_kallsyms 657 $(Q)$(if $($(quiet)cmd_sysmap), \ 658 echo ' $($(quiet)cmd_sysmap) .tmp_System.map' &&) \ 659 $(cmd_sysmap) .tmp_busybox$(last_kallsyms) .tmp_System.map 660 $(Q)cmp -s System.map .tmp_System.map || \ 661 (echo Inconsistent kallsyms data; \ 662 echo Try setting CONFIG_KALLSYMS_EXTRA_PASS; \ 663 rm .tmp_kallsyms* ; /bin/false ) 664endef 665 666# Update busybox version before link 667# Use + in front of this rule to silent warning about make -j1 668# First command is ':' to allow us to use + in front of this rule 669cmd_ksym_ld = $(cmd_busybox__) 670define rule_ksym_ld 671 : 672 +$(call cmd,busybox_version) 673 $(call cmd,busybox__) 674 $(Q)echo 'cmd_$@ := $(cmd_busybox__)' > $(@D)/.$(@F).cmd 675endef 676 677# Generate .S file with all kernel symbols 678quiet_cmd_kallsyms = KSYM $@ 679 cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \ 680 $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@ 681 682.tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE 683 $(call if_changed_dep,as_o_S) 684 685.tmp_kallsyms%.S: .tmp_busybox% $(KALLSYMS) 686 $(call cmd,kallsyms) 687 688# .tmp_busybox1 must be complete except kallsyms, so update busybox version 689.tmp_busybox1: $(busybox-lds) $(busybox-all) FORCE 690 $(call if_changed_rule,ksym_ld) 691 692.tmp_busybox2: $(busybox-lds) $(busybox-all) .tmp_kallsyms1.o FORCE 693 $(call if_changed,busybox__) 694 695.tmp_busybox3: $(busybox-lds) $(busybox-all) .tmp_kallsyms2.o FORCE 696 $(call if_changed,busybox__) 697 698# Needs to visit scripts/ before $(KALLSYMS) can be used. 699$(KALLSYMS): scripts ; 700 701# Generate some data for debugging strange kallsyms problems 702debug_kallsyms: .tmp_map$(last_kallsyms) 703 704.tmp_map%: .tmp_busybox% FORCE 705 ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@ 706 707.tmp_map3: .tmp_map2 708 709.tmp_map2: .tmp_map1 710 711endif # ifdef CONFIG_KALLSYMS 712 713# busybox image - including updated kernel symbols 714busybox_unstripped: $(busybox-all) FORCE 715 $(call if_changed_rule,busybox__) 716 $(Q)rm -f .old_version 717 718busybox: busybox_unstripped 719ifeq ($(SKIP_STRIP),y) 720 $(Q)cp $< $@ 721else 722 $(Q)$(STRIP) -s --remove-section=.note --remove-section=.comment \ 723 busybox_unstripped -o $@ 724# strip is confused by PIE executable and does not set exec bits 725 $(Q)chmod a+x $@ 726endif 727 728# The actual objects are generated when descending, 729# make sure no implicit rule kicks in 730$(sort $(busybox-all)): $(busybox-dirs) ; 731 732# Handle descending into subdirectories listed in $(busybox-dirs) 733# Preset locale variables to speed up the build process. Limit locale 734# tweaks to this spot to avoid wrong language settings when running 735# make menuconfig etc. 736# Error messages still appears in the original language 737 738PHONY += $(busybox-dirs) 739$(busybox-dirs): prepare scripts 740 $(Q)$(MAKE) $(build)=$@ 741 742# Build the kernel release string 743# The KERNELRELEASE is stored in a file named .kernelrelease 744# to be used when executing for example make install or make modules_install 745# 746# Take the contents of any files called localversion* and the config 747# variable CONFIG_LOCALVERSION and append them to KERNELRELEASE. 748# LOCALVERSION from the command line override all of this 749 750nullstring := 751space := $(nullstring) # end of line 752 753___localver = $(objtree)/localversion* $(srctree)/localversion* 754__localver = $(sort $(wildcard $(___localver))) 755# skip backup files (containing '~') 756_localver = $(foreach f, $(__localver), $(if $(findstring ~, $(f)),,$(f))) 757 758localver = $(subst $(space),, \ 759 $(shell cat /dev/null $(_localver)) \ 760 $(patsubst "%",%,$(CONFIG_LOCALVERSION))) 761 762# If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called 763# and if the SCM is know a tag from the SCM is appended. 764# The appended tag is determinded by the SCM used. 765# 766# Currently, only git is supported. 767# Other SCMs can edit scripts/setlocalversion and add the appropriate 768# checks as needed. 769ifdef _BB_DISABLED_CONFIG_LOCALVERSION_AUTO 770 _localver-auto = $(shell $(CONFIG_SHELL) \ 771 $(srctree)/scripts/setlocalversion $(srctree)) 772 localver-auto = $(LOCALVERSION)$(_localver-auto) 773endif 774 775localver-full = $(localver)$(localver-auto) 776 777# Store (new) KERNELRELASE string in .kernelrelease 778kernelrelease = $(KERNELVERSION)$(localver-full) 779.kernelrelease: FORCE 780 $(Q)rm -f $@ 781 $(Q)echo $(kernelrelease) > $@ 782 783 784# Things we need to do before we recursively start building the kernel 785# or the modules are listed in "prepare". 786# A multi level approach is used. prepareN is processed before prepareN-1. 787# archprepare is used in arch Makefiles and when processed asm symlink, 788# version.h and scripts_basic is processed / created. 789 790# Listed in dependency order 791PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3 792 793# prepare-all is deprecated, use prepare as valid replacement 794PHONY += prepare-all 795 796# prepare3 is used to check if we are building in a separate output directory, 797# and if so do: 798# 1) Check that make has not been executed in the kernel src $(srctree) 799# 2) Create the include2 directory, used for the second asm symlink 800prepare3: .kernelrelease 801ifneq ($(KBUILD_SRC),) 802 @echo ' Using $(srctree) as source for busybox' 803 $(Q)if [ -f $(srctree)/.config ]; then \ 804 echo " $(srctree) is not clean, please run 'make mrproper'";\ 805 echo " in the '$(srctree)' directory.";\ 806 /bin/false; \ 807 fi; 808 $(Q)if [ ! -d include2 ]; then mkdir -p include2; fi; 809 $(Q)ln -fsn $(srctree)/include/asm-$(ARCH) include2/asm 810endif 811 812# prepare2 creates a makefile if using a separate output directory 813prepare2: prepare3 outputmakefile 814 815prepare1: prepare2 include/config/MARKER 816ifneq ($(KBUILD_MODULES),) 817 $(Q)mkdir -p $(MODVERDIR) 818 $(Q)rm -f $(MODVERDIR)/* 819endif 820 821archprepare: prepare1 scripts_basic applets_dir 822 823prepare0: archprepare FORCE 824 $(Q)$(MAKE) $(build)=. 825 826# All the preparing.. 827prepare prepare-all: prepare0 828 829# Leave this as default for preprocessing busybox.lds.S, which is now 830# done in arch/$(ARCH)/kernel/Makefile 831 832export CPPFLAGS_busybox.lds += -P -C -U$(ARCH) 833 834# FIXME: The asm symlink changes when $(ARCH) changes. That's 835# hard to detect, but I suppose "make mrproper" is a good idea 836# before switching between archs anyway. 837 838#bbox# include/asm: 839#bbox# @echo ' SYMLINK $@ -> include/asm-$(ARCH)' 840#bbox# $(Q)if [ ! -d include ]; then mkdir -p include; fi; 841#bbox# @ln -fsn asm-$(ARCH) $@ 842 843# Split autoconf.h into include/linux/config/* 844quiet_cmd_gen_bbconfigopts = GEN include/bbconfigopts.h 845 cmd_gen_bbconfigopts = $(srctree)/scripts/mkconfigs include/bbconfigopts.h include/bbconfigopts_bz2.h 846quiet_cmd_split_autoconf = SPLIT include/autoconf.h -> include/config/* 847 cmd_split_autoconf = scripts/basic/split-include include/autoconf.h include/config 848#bbox# piggybacked generation of few .h files 849include/config/MARKER: scripts/basic/split-include include/autoconf.h 850 $(call cmd,split_autoconf) 851 $(call cmd,gen_bbconfigopts) 852 @touch $@ 853 854# Generate some files 855# --------------------------------------------------------------------------- 856 857# KERNELRELEASE can change from a few different places, meaning version.h 858# needs to be updated, so this check is forced on all builds 859 860uts_len := 64 861 862define filechk_version.h 863 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 864 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 865 exit 1; \ 866 fi; \ 867 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"; \ 868 echo \#define LINUX_VERSION_CODE `expr $(VERSION) \\* 65536 + $(PATCHLEVEL) \\* 256 + $(SUBLEVEL)`; \ 869 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'; \ 870 ) 871endef 872 873# --------------------------------------------------------------------------- 874 875PHONY += depend dep 876depend dep: 877 @echo '*** Warning: make $@ is unnecessary now.' 878 879# --------------------------------------------------------------------------- 880# Modules 881 882ifdef _BB_DISABLED_CONFIG_MODULES 883 884# By default, build modules as well 885 886all: modules 887 888# Build modules 889 890PHONY += modules 891modules: $(busybox-dirs) $(if $(KBUILD_BUILTIN),busybox) 892 @echo ' Building modules, stage 2.'; 893 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost 894 895 896# Target to prepare building external modules 897PHONY += modules_prepare 898modules_prepare: prepare scripts 899 900# Target to install modules 901PHONY += modules_install 902modules_install: _modinst_ _modinst_post 903 904PHONY += _modinst_ 905_modinst_: 906 @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \ 907 echo "Warning: you may need to install module-init-tools"; \ 908 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\ 909 sleep 1; \ 910 fi 911 @rm -rf $(MODLIB)/kernel 912 @rm -f $(MODLIB)/source 913 @mkdir -p $(MODLIB)/kernel 914 @ln -s $(srctree) $(MODLIB)/source 915 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 916 rm -f $(MODLIB)/build ; \ 917 ln -s $(objtree) $(MODLIB)/build ; \ 918 fi 919 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modinst 920 921# If System.map exists, run depmod. This deliberately does not have a 922# dependency on System.map since that would run the dependency tree on 923# busybox. This depmod is only for convenience to give the initial 924# boot a modules.dep even before / is mounted read-write. However the 925# boot script depmod is the master version. 926ifeq "$(strip $(INSTALL_MOD_PATH))" "" 927depmod_opts := 928else 929depmod_opts := -b $(INSTALL_MOD_PATH) -r 930endif 931PHONY += _modinst_post 932_modinst_post: _modinst_ 933 if [ -r System.map -a -x $(DEPMOD) ]; then $(DEPMOD) -ae -F System.map $(depmod_opts) $(KERNELRELEASE); fi 934 935else # CONFIG_MODULES 936 937# Modules not configured 938# --------------------------------------------------------------------------- 939 940modules modules_install: FORCE 941 @echo 942 @echo "The present busybox configuration has modules disabled." 943 @echo "Type 'make config' and enable loadable module support." 944 @echo "Then build a kernel with module support enabled." 945 @echo 946 @exit 1 947 948endif # CONFIG_MODULES 949 950### 951# Cleaning is done on three levels. 952# make clean Delete most generated files 953# Leave enough to build external modules 954# make mrproper Delete the current configuration, and all generated files 955# make distclean Remove editor backup files, patch leftover files and the like 956 957# Directories & files removed with 'make clean' 958CLEAN_DIRS += $(MODVERDIR) _install 0_lib 959CLEAN_FILES += busybox busybox_unstripped* busybox.links \ 960 System.map .kernelrelease \ 961 .tmp_kallsyms* .tmp_version .tmp_busybox* .tmp_System.map 962 963# Directories & files removed with 'make mrproper' 964MRPROPER_DIRS += include/config include2 965MRPROPER_FILES += .config .config.old include/asm .version .old_version \ 966 include/autoconf.h \ 967 include/bbconfigopts.h \ 968 include/usage_compressed.h \ 969 include/applet_tables.h \ 970 applets/usage \ 971 .kernelrelease Module.symvers tags TAGS cscope* \ 972 busybox_old 973 974# clean - Delete most, but leave enough to build external modules 975# 976clean: rm-dirs := $(CLEAN_DIRS) 977clean: rm-files := $(CLEAN_FILES) 978clean-dirs := $(addprefix _clean_,$(srctree) $(busybox-alldirs)) 979 980PHONY += $(clean-dirs) clean archclean 981$(clean-dirs): 982 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 983 984clean: archclean $(clean-dirs) 985 $(call cmd,rmdirs) 986 $(call cmd,rmfiles) 987 @find . $(RCS_FIND_IGNORE) \ 988 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \ 989 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \ 990 -type f -print | xargs rm -f 991 992PHONY += doc-clean 993doc-clean: rm-files := docs/busybox.pod \ 994 docs/BusyBox.html docs/busybox.1 docs/BusyBox.txt 995doc-clean: 996 $(call cmd,rmfiles) 997 998# mrproper - Delete all generated files, including .config 999# 1000mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1001mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1002mrproper-dirs := $(addprefix _mrproper_,scripts) 1003 1004PHONY += $(mrproper-dirs) mrproper archmrproper 1005$(mrproper-dirs): 1006 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1007 1008mrproper: clean archmrproper $(mrproper-dirs) 1009 $(call cmd,rmdirs) 1010 $(call cmd,rmfiles) 1011 @find -name Config.src | sed 's/.src$$/.in/' | xargs -r rm -f 1012 @find -name Kbuild.src | sed 's/.src$$//' | xargs -r rm -f 1013 1014# distclean 1015# 1016PHONY += distclean 1017 1018distclean: mrproper 1019 @find $(srctree) $(RCS_FIND_IGNORE) \ 1020 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1021 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \ 1022 -o -name '.*.rej' -o -name '*.tmp' -o -size 0 \ 1023 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \ 1024 -type f -print | xargs rm -f 1025 1026 1027# Packaging of the kernel to various formats 1028# --------------------------------------------------------------------------- 1029# rpm target kept for backward compatibility 1030package-dir := $(srctree)/scripts/package 1031 1032%pkg: FORCE 1033 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1034rpm: FORCE 1035 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1036 1037 1038# Brief documentation of the typical targets used 1039# --------------------------------------------------------------------------- 1040 1041boards := $(wildcard $(srctree)/arch/$(ARCH)/configs/*_defconfig) 1042boards := $(notdir $(boards)) 1043 1044-include $(srctree)/Makefile.help 1045 1046# Documentation targets 1047# --------------------------------------------------------------------------- 1048%docs: scripts_basic FORCE 1049 $(Q)$(MAKE) $(build)=Documentation/DocBook $@ 1050 1051else # KBUILD_EXTMOD 1052 1053### 1054# External module support. 1055# When building external modules the kernel used as basis is considered 1056# read-only, and no consistency checks are made and the make 1057# system is not used on the basis kernel. If updates are required 1058# in the basis kernel ordinary make commands (without M=...) must 1059# be used. 1060# 1061# The following are the only valid targets when building external 1062# modules. 1063# make M=dir clean Delete all automatically generated files 1064# make M=dir modules Make all modules in specified dir 1065# make M=dir Same as 'make M=dir modules' 1066# make M=dir modules_install 1067# Install the modules build in the module directory 1068# Assumes install directory is already created 1069 1070# We are always building modules 1071KBUILD_MODULES := 1 1072PHONY += crmodverdir 1073crmodverdir: 1074 $(Q)mkdir -p $(MODVERDIR) 1075 $(Q)rm -f $(MODVERDIR)/* 1076 1077PHONY += $(objtree)/Module.symvers 1078$(objtree)/Module.symvers: 1079 @test -e $(objtree)/Module.symvers || ( \ 1080 echo; \ 1081 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \ 1082 echo " is missing; modules will have no dependencies and modversions."; \ 1083 echo ) 1084 1085module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD)) 1086PHONY += $(module-dirs) modules 1087$(module-dirs): crmodverdir $(objtree)/Module.symvers 1088 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@) 1089 1090modules: $(module-dirs) 1091 @echo ' Building modules, stage 2.'; 1092 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost 1093 1094PHONY += modules_install 1095modules_install: _emodinst_ _emodinst_post 1096 1097install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra) 1098PHONY += _emodinst_ 1099_emodinst_: 1100 $(Q)mkdir -p $(MODLIB)/$(install-dir) 1101 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modinst 1102 1103# Run depmod only is we have System.map and depmod is executable 1104quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) 1105 cmd_depmod = if [ -r System.map -a -x $(DEPMOD) ]; then \ 1106 $(DEPMOD) -ae -F System.map \ 1107 $(if $(strip $(INSTALL_MOD_PATH)), \ 1108 -b $(INSTALL_MOD_PATH) -r) \ 1109 $(KERNELRELEASE); \ 1110 fi 1111 1112PHONY += _emodinst_post 1113_emodinst_post: _emodinst_ 1114 $(call cmd,depmod) 1115 1116clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD)) 1117 1118PHONY += $(clean-dirs) clean 1119$(clean-dirs): 1120 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1121 1122clean: rm-dirs := $(MODVERDIR) 1123clean: $(clean-dirs) 1124 $(call cmd,rmdirs) 1125 @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \ 1126 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \ 1127 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \ 1128 -type f -print | xargs rm -f 1129 1130help: 1131 @echo ' Building external modules.' 1132 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1133 @echo '' 1134 @echo ' modules - default target, build the module(s)' 1135 @echo ' modules_install - install the module' 1136 @echo ' clean - remove generated files in module directory only' 1137 @echo '' 1138 1139# Dummies... 1140PHONY += prepare scripts 1141prepare: ; 1142scripts: ; 1143endif # KBUILD_EXTMOD 1144 1145# Generate tags for editors 1146# --------------------------------------------------------------------------- 1147 1148#We want __srctree to totally vanish out when KBUILD_OUTPUT is not set 1149#(which is the most common case IMHO) to avoid unneeded clutter in the big tags file. 1150#Adding $(srctree) adds about 20M on i386 to the size of the output file! 1151 1152ifeq ($(src),$(obj)) 1153__srctree = 1154else 1155__srctree = $(srctree)/ 1156endif 1157 1158ifeq ($(ALLSOURCE_ARCHS),) 1159ifeq ($(ARCH),um) 1160ALLINCLUDE_ARCHS := $(ARCH) $(SUBARCH) 1161else 1162ALLINCLUDE_ARCHS := $(ARCH) 1163endif 1164else 1165#Allow user to specify only ALLSOURCE_PATHS on the command line, keeping existing behaviour. 1166ALLINCLUDE_ARCHS := $(ALLSOURCE_ARCHS) 1167endif 1168 1169ALLSOURCE_ARCHS := $(ARCH) 1170 1171define all-sources 1172 ( find $(__srctree) $(RCS_FIND_IGNORE) \ 1173 \( -name include -o -name arch \) -prune -o \ 1174 -name '*.[chS]' -print; \ 1175 for ARCH in $(ALLSOURCE_ARCHS) ; do \ 1176 find $(__srctree)arch/$${ARCH} $(RCS_FIND_IGNORE) \ 1177 -name '*.[chS]' -print; \ 1178 done ; \ 1179 find $(__srctree)security/selinux/include $(RCS_FIND_IGNORE) \ 1180 -name '*.[chS]' -print; \ 1181 find $(__srctree)include $(RCS_FIND_IGNORE) \ 1182 \( -name config -o -name 'asm-*' \) -prune \ 1183 -o -name '*.[chS]' -print; \ 1184 for ARCH in $(ALLINCLUDE_ARCHS) ; do \ 1185 find $(__srctree)include/asm-$${ARCH} $(RCS_FIND_IGNORE) \ 1186 -name '*.[chS]' -print; \ 1187 done ; \ 1188 find $(__srctree)include/asm-generic $(RCS_FIND_IGNORE) \ 1189 -name '*.[chS]' -print ) 1190endef 1191 1192quiet_cmd_cscope-file = FILELST cscope.files 1193 cmd_cscope-file = (echo \-k; echo \-q; $(all-sources)) > cscope.files 1194 1195quiet_cmd_cscope = MAKE cscope.out 1196 cmd_cscope = cscope -b 1197 1198cscope: FORCE 1199 $(call cmd,cscope-file) 1200 $(call cmd,cscope) 1201 1202quiet_cmd_TAGS = MAKE $@ 1203define cmd_TAGS 1204 rm -f $@; \ 1205 ETAGSF=`etags --version | grep -i exuberant >/dev/null && \ 1206 echo "-I __initdata,__exitdata,__acquires,__releases \ 1207 -I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL \ 1208 --extra=+f --c-kinds=+px"`; \ 1209 $(all-sources) | xargs etags $$ETAGSF -a 1210endef 1211 1212TAGS: FORCE 1213 $(call cmd,TAGS) 1214 1215 1216quiet_cmd_tags = MAKE $@ 1217define cmd_tags 1218 rm -f $@; \ 1219 CTAGSF=`ctags --version | grep -i exuberant >/dev/null && \ 1220 echo "-I __initdata,__exitdata,__acquires,__releases \ 1221 -I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL \ 1222 --extra=+f --c-kinds=+px"`; \ 1223 $(all-sources) | xargs ctags $$CTAGSF -a 1224endef 1225 1226tags: FORCE 1227 $(call cmd,tags) 1228 1229 1230# Scripts to check various things for consistency 1231# --------------------------------------------------------------------------- 1232 1233includecheck: 1234 find * $(RCS_FIND_IGNORE) \ 1235 -name '*.[hcS]' -type f -print | sort \ 1236 | xargs $(PERL) -w scripts/checkincludes.pl 1237 1238versioncheck: 1239 find * $(RCS_FIND_IGNORE) \ 1240 -name '*.[hcS]' -type f -print | sort \ 1241 | xargs $(PERL) -w scripts/checkversion.pl 1242 1243namespacecheck: 1244 $(PERL) $(srctree)/scripts/namespace.pl 1245 1246endif #ifeq ($(config-targets),1) 1247endif #ifeq ($(mixed-targets),1) 1248 1249PHONY += checkstack 1250checkstack: 1251 $(OBJDUMP) -d busybox $$(find . -name '*.ko') | \ 1252 $(PERL) $(src)/scripts/checkstack.pl $(ARCH) 1253 1254kernelrelease: 1255 $(if $(wildcard .kernelrelease), $(Q)echo $(KERNELRELEASE), \ 1256 $(error kernelrelease not valid - run 'make *config' to update it)) 1257kernelversion: 1258 @echo $(KERNELVERSION) 1259 1260# Single targets 1261# --------------------------------------------------------------------------- 1262# Single targets are compatible with: 1263# - build whith mixed source and output 1264# - build with separate output dir 'make O=...' 1265# - external modules 1266# 1267# target-dir => where to store outputfile 1268# build-dir => directory in kernel source tree to use 1269 1270ifeq ($(KBUILD_EXTMOD),) 1271 build-dir = $(patsubst %/,%,$(dir $@)) 1272 target-dir = $(dir $@) 1273else 1274 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@))) 1275 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash)) 1276 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@)) 1277endif 1278 1279%.s: %.c prepare scripts FORCE 1280 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1281%.i: %.c prepare scripts FORCE 1282 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1283%.o: %.c prepare scripts FORCE 1284 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1285%.lst: %.c prepare scripts FORCE 1286 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1287%.s: %.S prepare scripts FORCE 1288 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1289%.o: %.S prepare scripts FORCE 1290 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1291 1292# Modules 1293%/: prepare scripts FORCE 1294 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1295 $(build)=$(build-dir) 1296/: prepare scripts FORCE 1297 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1298 $(build)=$(build-dir) 1299 1300%.ko: prepare scripts FORCE 1301 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1302 $(build)=$(build-dir) $(@:.ko=.o) 1303 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost 1304 1305# FIXME Should go into a make.lib or something 1306# =========================================================================== 1307 1308quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs))) 1309 cmd_rmdirs = rm -rf $(rm-dirs) 1310 1311quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1312 cmd_rmfiles = rm -f $(rm-files) 1313 1314 1315a_flags = -Wp,-MD,$(depfile) $(AFLAGS) $(AFLAGS_KERNEL) \ 1316 $(NOSTDINC_FLAGS) $(CPPFLAGS) \ 1317 $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(*F).o) 1318 1319quiet_cmd_as_o_S = AS $@ 1320cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $< 1321 1322# read all saved command lines 1323 1324targets := $(wildcard $(sort $(targets))) 1325cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd)) 1326 1327ifneq ($(cmd_files),) 1328 $(cmd_files): ; # Do not try to update included dependency files 1329 include $(cmd_files) 1330endif 1331 1332# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir 1333# Usage: 1334# $(Q)$(MAKE) $(clean)=dir 1335clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj 1336 1337endif # skip-makefile 1338 1339PHONY += FORCE 1340FORCE: 1341 1342-include $(srctree)/Makefile.custom 1343 1344# Declare the contents of the .PHONY variable as phony. We keep that 1345# information in a variable se we can use it in if_changed and friends. 1346.PHONY: $(PHONY) 1347