1VERSION = 2 2PATCHLEVEL = 6 3SUBLEVEL = 39 4EXTRAVERSION = 5NAME = Flesh-Eating Bats with Fangs 6 7# *DOCUMENTATION* 8# To see a list of typical targets execute "make help" 9# More info can be located in ./README 10# Comments in this file are targeted only to the developer, do not 11# expect to learn how to build the kernel reading this file. 12 13# Do not: 14# o use make's built-in rules and variables 15# (this increases performance and avoids hard-to-debug behaviour); 16# o print "Entering directory ..."; 17MAKEFLAGS += -rR --no-print-directory 18 19# Avoid funny character set dependencies 20unexport LC_ALL 21LC_COLLATE=C 22LC_NUMERIC=C 23export LC_COLLATE LC_NUMERIC 24 25# We are using a recursive build, so we need to do a little thinking 26# to get the ordering right. 27# 28# Most importantly: sub-Makefiles should only ever modify files in 29# their own directory. If in some directory we have a dependency on 30# a file in another dir (which doesn't happen often, but it's often 31# unavoidable when linking the built-in.o targets which finally 32# turn into vmlinux), we will call a sub make in that other dir, and 33# after that we are sure that everything which is in that other dir 34# is now up to date. 35# 36# The only cases where we need to modify files which have global 37# effects are thus separated out and done before the recursive 38# descending is started. They are now explicitly listed as the 39# prepare rule. 40 41# To put more focus on warnings, be less verbose as default 42# Use 'make V=1' to see the full commands 43 44ifeq ("$(origin V)", "command line") 45 KBUILD_VERBOSE = $(V) 46endif 47ifndef KBUILD_VERBOSE 48 KBUILD_VERBOSE = 0 49endif 50 51# Call a source code checker (by default, "sparse") as part of the 52# C compilation. 53# 54# Use 'make C=1' to enable checking of only re-compiled files. 55# Use 'make C=2' to enable checking of *all* source files, regardless 56# of whether they are re-compiled or not. 57# 58# See the file "Documentation/sparse.txt" for more details, including 59# where to get the "sparse" utility. 60 61ifeq ("$(origin C)", "command line") 62 KBUILD_CHECKSRC = $(C) 63endif 64ifndef KBUILD_CHECKSRC 65 KBUILD_CHECKSRC = 0 66endif 67 68# Use make M=dir to specify directory of external module to build 69# Old syntax make ... SUBDIRS=$PWD is still supported 70# Setting the environment variable KBUILD_EXTMOD take precedence 71ifdef SUBDIRS 72 KBUILD_EXTMOD ?= $(SUBDIRS) 73endif 74 75ifeq ("$(origin M)", "command line") 76 KBUILD_EXTMOD := $(M) 77endif 78 79# kbuild supports saving output files in a separate directory. 80# To locate output files in a separate directory two syntaxes are supported. 81# In both cases the working directory must be the root of the kernel src. 82# 1) O= 83# Use "make O=dir/to/store/output/files/" 84# 85# 2) Set KBUILD_OUTPUT 86# Set the environment variable KBUILD_OUTPUT to point to the directory 87# where the output files shall be placed. 88# export KBUILD_OUTPUT=dir/to/store/output/files/ 89# make 90# 91# The O= assignment takes precedence over the KBUILD_OUTPUT environment 92# variable. 93 94 95# KBUILD_SRC is set on invocation of make in OBJ directory 96# KBUILD_SRC is not intended to be used by the regular user (for now) 97ifeq ($(KBUILD_SRC),) 98 99# OK, Make called in directory where kernel src resides 100# Do we want to locate output files in a separate directory? 101ifeq ("$(origin O)", "command line") 102 KBUILD_OUTPUT := $(O) 103endif 104 105ifeq ("$(origin W)", "command line") 106 export KBUILD_ENABLE_EXTRA_GCC_CHECKS := 1 107endif 108 109# That's our default target when none is given on the command line 110PHONY := _all 111_all: 112 113# Cancel implicit rules on top Makefile 114$(CURDIR)/Makefile Makefile: ; 115 116ifneq ($(KBUILD_OUTPUT),) 117# Invoke a second make in the output directory, passing relevant variables 118# check that the output directory actually exists 119saved-output := $(KBUILD_OUTPUT) 120KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd) 121$(if $(KBUILD_OUTPUT),, \ 122 $(error output directory "$(saved-output)" does not exist)) 123 124PHONY += $(MAKECMDGOALS) sub-make 125 126$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make 127 $(Q)@: 128 129sub-make: FORCE 130 $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \ 131 KBUILD_SRC=$(CURDIR) \ 132 KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \ 133 $(filter-out _all sub-make,$(MAKECMDGOALS)) 134 135# Leave processing to above invocation of make 136skip-makefile := 1 137endif # ifneq ($(KBUILD_OUTPUT),) 138endif # ifeq ($(KBUILD_SRC),) 139 140# We process the rest of the Makefile if this is the final invocation of make 141ifeq ($(skip-makefile),) 142 143# If building an external module we do not care about the all: rule 144# but instead _all depend on modules 145PHONY += all 146ifeq ($(KBUILD_EXTMOD),) 147_all: all 148else 149_all: modules 150endif 151 152srctree := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR)) 153objtree := $(CURDIR) 154src := $(srctree) 155obj := $(objtree) 156 157VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD)) 158 159export srctree objtree VPATH 160 161 162# SUBARCH tells the usermode build what the underlying arch is. That is set 163# first, and if a usermode build is happening, the "ARCH=um" on the command 164# line overrides the setting of ARCH below. If a native build is happening, 165# then ARCH is assigned, getting whatever value it gets normally, and 166# SUBARCH is subsequently ignored. 167 168SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \ 169 -e s/arm.*/arm/ -e s/sa110/arm/ \ 170 -e s/s390x/s390/ -e s/parisc64/parisc/ \ 171 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \ 172 -e s/sh[234].*/sh/ ) 173 174# Cross compiling and selecting different set of gcc/bin-utils 175# --------------------------------------------------------------------------- 176# 177# When performing cross compilation for other architectures ARCH shall be set 178# to the target architecture. (See arch/* for the possibilities). 179# ARCH can be set during invocation of make: 180# make ARCH=ia64 181# Another way is to have ARCH set in the environment. 182# The default ARCH is the host where make is executed. 183 184# CROSS_COMPILE specify the prefix used for all executables used 185# during compilation. Only gcc and related bin-utils executables 186# are prefixed with $(CROSS_COMPILE). 187# CROSS_COMPILE can be set on the command line 188# make CROSS_COMPILE=ia64-linux- 189# Alternatively CROSS_COMPILE can be set in the environment. 190# A third alternative is to store a setting in .config so that plain 191# "make" in the configured kernel build directory always uses that. 192# Default value for CROSS_COMPILE is not to prefix executables 193# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 194export KBUILD_BUILDHOST := $(SUBARCH) 195ARCH ?= $(SUBARCH) 196CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%) 197 198# Architecture as present in compile.h 199UTS_MACHINE := $(ARCH) 200SRCARCH := $(ARCH) 201 202# Additional ARCH settings for x86 203ifeq ($(ARCH),i386) 204 SRCARCH := x86 205endif 206ifeq ($(ARCH),x86_64) 207 SRCARCH := x86 208endif 209 210# Additional ARCH settings for sparc 211ifeq ($(ARCH),sparc32) 212 SRCARCH := sparc 213endif 214ifeq ($(ARCH),sparc64) 215 SRCARCH := sparc 216endif 217 218# Additional ARCH settings for sh 219ifeq ($(ARCH),sh64) 220 SRCARCH := sh 221endif 222 223# Where to locate arch specific headers 224hdr-arch := $(SRCARCH) 225 226ifeq ($(ARCH),m68knommu) 227 hdr-arch := m68k 228endif 229 230KCONFIG_CONFIG ?= .config 231export KCONFIG_CONFIG 232 233# SHELL used by kbuild 234CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \ 235 else if [ -x /bin/bash ]; then echo /bin/bash; \ 236 else echo sh; fi ; fi) 237 238HOSTCC = gcc 239HOSTCXX = g++ 240HOSTCFLAGS = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer 241HOSTCXXFLAGS = -O2 242 243# Decide whether to build built-in, modular, or both. 244# Normally, just do built-in. 245 246KBUILD_MODULES := 247KBUILD_BUILTIN := 1 248 249# If we have only "make modules", don't compile built-in objects. 250# When we're building modules with modversions, we need to consider 251# the built-in objects during the descend as well, in order to 252# make sure the checksums are up to date before we record them. 253 254ifeq ($(MAKECMDGOALS),modules) 255 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1) 256endif 257 258# If we have "make <whatever> modules", compile modules 259# in addition to whatever we do anyway. 260# Just "make" or "make all" shall build modules as well 261 262ifneq ($(filter all _all modules,$(MAKECMDGOALS)),) 263 KBUILD_MODULES := 1 264endif 265 266ifeq ($(MAKECMDGOALS),) 267 KBUILD_MODULES := 1 268endif 269 270export KBUILD_MODULES KBUILD_BUILTIN 271export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD 272 273# Beautify output 274# --------------------------------------------------------------------------- 275# 276# Normally, we echo the whole command before executing it. By making 277# that echo $($(quiet)$(cmd)), we now have the possibility to set 278# $(quiet) to choose other forms of output instead, e.g. 279# 280# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@ 281# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< 282# 283# If $(quiet) is empty, the whole command will be printed. 284# If it is set to "quiet_", only the short version will be printed. 285# If it is set to "silent_", nothing will be printed at all, since 286# the variable $(silent_cmd_cc_o_c) doesn't exist. 287# 288# A simple variant is to prefix commands with $(Q) - that's useful 289# for commands that shall be hidden in non-verbose mode. 290# 291# $(Q)ln $@ :< 292# 293# If KBUILD_VERBOSE equals 0 then the above command will be hidden. 294# If KBUILD_VERBOSE equals 1 then the above command is displayed. 295 296ifeq ($(KBUILD_VERBOSE),1) 297 quiet = 298 Q = 299else 300 quiet=quiet_ 301 Q = @ 302endif 303 304# If the user is running make -s (silent mode), suppress echoing of 305# commands 306 307ifneq ($(findstring s,$(MAKEFLAGS)),) 308 quiet=silent_ 309endif 310 311export quiet Q KBUILD_VERBOSE 312 313 314# Look for make include files relative to root of kernel src 315MAKEFLAGS += --include-dir=$(srctree) 316 317# We need some generic definitions (do not try to remake the file). 318$(srctree)/scripts/Kbuild.include: ; 319include $(srctree)/scripts/Kbuild.include 320 321# Make variables (CC, etc...) 322 323AS = $(CROSS_COMPILE)as 324LD = $(CROSS_COMPILE)ld 325CC = $(CROSS_COMPILE)gcc 326CPP = $(CC) -E 327AR = $(CROSS_COMPILE)ar 328NM = $(CROSS_COMPILE)nm 329STRIP = $(CROSS_COMPILE)strip 330OBJCOPY = $(CROSS_COMPILE)objcopy 331OBJDUMP = $(CROSS_COMPILE)objdump 332AWK = awk 333GENKSYMS = scripts/genksyms/genksyms 334INSTALLKERNEL := installkernel 335DEPMOD = /sbin/depmod 336KALLSYMS = scripts/kallsyms 337PERL = perl 338CHECK = sparse 339 340CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 341 -Wbitwise -Wno-return-void $(CF) 342CFLAGS_MODULE = 343AFLAGS_MODULE = 344LDFLAGS_MODULE = 345CFLAGS_KERNEL = 346AFLAGS_KERNEL = 347CFLAGS_GCOV = -fprofile-arcs -ftest-coverage 348 349 350# Use LINUXINCLUDE when you must reference the include/ directory. 351# Needed to be compatible with the O= option 352LINUXINCLUDE := -I$(srctree)/arch/$(hdr-arch)/include -Iinclude \ 353 $(if $(KBUILD_SRC), -I$(srctree)/include) \ 354 -include include/generated/autoconf.h 355 356KBUILD_CPPFLAGS := -D__KERNEL__ 357 358KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \ 359 -fno-strict-aliasing -fno-common \ 360 -Werror-implicit-function-declaration \ 361 -Wno-format-security \ 362 -fno-delete-null-pointer-checks 363KBUILD_AFLAGS_KERNEL := 364KBUILD_CFLAGS_KERNEL := 365KBUILD_AFLAGS := -D__ASSEMBLY__ 366KBUILD_AFLAGS_MODULE := -DMODULE 367KBUILD_CFLAGS_MODULE := -DMODULE 368KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds 369 370# Read KERNELRELEASE from include/config/kernel.release (if it exists) 371KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null) 372KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION) 373 374export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 375export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC 376export CPP AR NM STRIP OBJCOPY OBJDUMP 377export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE 378export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS 379 380export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS 381export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV 382export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 383export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 384export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 385 386# When compiling out-of-tree modules, put MODVERDIR in the module 387# tree rather than in the kernel tree. The kernel tree might 388# even be read-only. 389export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions 390 391# Files to ignore in find ... statements 392 393RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS -o -name .pc -o -name .hg -o -name .git \) -prune -o 394export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git 395 396# =========================================================================== 397# Rules shared between *config targets and build targets 398 399# Basic helpers built in scripts/ 400PHONY += scripts_basic 401scripts_basic: 402 $(Q)$(MAKE) $(build)=scripts/basic 403 $(Q)rm -f .tmp_quiet_recordmcount 404 405# To avoid any implicit rule to kick in, define an empty command. 406scripts/basic/%: scripts_basic ; 407 408PHONY += outputmakefile 409# outputmakefile generates a Makefile in the output directory, if using a 410# separate output directory. This allows convenient use of make in the 411# output directory. 412outputmakefile: 413ifneq ($(KBUILD_SRC),) 414 $(Q)ln -fsn $(srctree) source 415 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \ 416 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL) 417endif 418 419# To make sure we do not include .config for any of the *config targets 420# catch them early, and hand them over to scripts/kconfig/Makefile 421# It is allowed to specify more targets when calling make, including 422# mixing *config targets and build targets. 423# For example 'make oldconfig all'. 424# Detect when mixed targets is specified, and make a second invocation 425# of make so .config is not included in this case either (for *config). 426 427no-dot-config-targets := clean mrproper distclean \ 428 cscope gtags TAGS tags help %docs check% coccicheck \ 429 include/linux/version.h headers_% \ 430 kernelversion %src-pkg 431 432config-targets := 0 433mixed-targets := 0 434dot-config := 1 435 436ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 437 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 438 dot-config := 0 439 endif 440endif 441 442ifeq ($(KBUILD_EXTMOD),) 443 ifneq ($(filter config %config,$(MAKECMDGOALS)),) 444 config-targets := 1 445 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),) 446 mixed-targets := 1 447 endif 448 endif 449endif 450 451ifeq ($(mixed-targets),1) 452# =========================================================================== 453# We're called with mixed targets (*config and build targets). 454# Handle them one by one. 455 456%:: FORCE 457 $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@ 458 459else 460ifeq ($(config-targets),1) 461# =========================================================================== 462# *config targets only - make sure prerequisites are updated, and descend 463# in scripts/kconfig to make the *config target 464 465# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 466# KBUILD_DEFCONFIG may point out an alternative default configuration 467# used for 'make defconfig' 468include $(srctree)/arch/$(SRCARCH)/Makefile 469export KBUILD_DEFCONFIG KBUILD_KCONFIG 470 471config: scripts_basic outputmakefile FORCE 472 $(Q)mkdir -p include/linux include/config 473 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 474 475%config: scripts_basic outputmakefile FORCE 476 $(Q)mkdir -p include/linux include/config 477 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 478 479else 480# =========================================================================== 481# Build targets only - this includes vmlinux, arch specific targets, clean 482# targets and others. In general all targets except *config targets. 483 484ifeq ($(KBUILD_EXTMOD),) 485# Additional helpers built in scripts/ 486# Carefully list dependencies so we do not try to build scripts twice 487# in parallel 488PHONY += scripts 489scripts: scripts_basic include/config/auto.conf include/config/tristate.conf 490 $(Q)$(MAKE) $(build)=$(@) 491 492# Objects we will link into vmlinux / subdirs we need to visit 493init-y := init/ 494drivers-y := drivers/ sound/ firmware/ 495net-y := net/ 496libs-y := lib/ 497core-y := usr/ 498endif # KBUILD_EXTMOD 499 500ifeq ($(dot-config),1) 501# Read in config 502-include include/config/auto.conf 503 504ifeq ($(KBUILD_EXTMOD),) 505# Read in dependencies to all Kconfig* files, make sure to run 506# oldconfig if changes are detected. 507-include include/config/auto.conf.cmd 508 509# To avoid any implicit rule to kick in, define an empty command 510$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ; 511 512# If .config is newer than include/config/auto.conf, someone tinkered 513# with it and forgot to run make oldconfig. 514# if auto.conf.cmd is missing then we are probably in a cleaned tree so 515# we execute the config step to be sure to catch updated Kconfig files 516include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd 517 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig 518else 519# external modules needs include/generated/autoconf.h and include/config/auto.conf 520# but do not care if they are up-to-date. Use auto.conf to trigger the test 521PHONY += include/config/auto.conf 522 523include/config/auto.conf: 524 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 525 echo; \ 526 echo " ERROR: Kernel configuration is invalid."; \ 527 echo " include/generated/autoconf.h or $@ are missing.";\ 528 echo " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 529 echo; \ 530 /bin/false) 531 532endif # KBUILD_EXTMOD 533 534else 535# Dummy target needed, because used as prerequisite 536include/config/auto.conf: ; 537endif # $(dot-config) 538 539# The all: target is the default when no target is given on the 540# command line. 541# This allow a user to issue only 'make' to build a kernel including modules 542# Defaults to vmlinux, but the arch makefile usually adds further targets 543all: vmlinux 544 545ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 546KBUILD_CFLAGS += -Os 547else 548KBUILD_CFLAGS += -O2 549endif 550 551include $(srctree)/arch/$(SRCARCH)/Makefile 552 553ifneq ($(CONFIG_FRAME_WARN),0) 554KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN}) 555endif 556 557# Force gcc to behave correct even for buggy distributions 558ifndef CONFIG_CC_STACKPROTECTOR 559KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector) 560endif 561 562ifdef CONFIG_FRAME_POINTER 563KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 564else 565# Some targets (ARM with Thumb2, for example), can't be built with frame 566# pointers. For those, we don't have FUNCTION_TRACER automatically 567# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 568# incompatible with -fomit-frame-pointer with current GCC, so we don't use 569# -fomit-frame-pointer with FUNCTION_TRACER. 570ifndef CONFIG_FUNCTION_TRACER 571KBUILD_CFLAGS += -fomit-frame-pointer 572endif 573endif 574 575ifdef CONFIG_DEBUG_INFO 576KBUILD_CFLAGS += -g 577KBUILD_AFLAGS += -gdwarf-2 578endif 579 580ifdef CONFIG_DEBUG_INFO_REDUCED 581KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) 582endif 583 584ifdef CONFIG_FUNCTION_TRACER 585KBUILD_CFLAGS += -pg 586ifdef CONFIG_DYNAMIC_FTRACE 587 ifdef CONFIG_HAVE_C_RECORDMCOUNT 588 BUILD_C_RECORDMCOUNT := y 589 export BUILD_C_RECORDMCOUNT 590 endif 591endif 592endif 593 594# We trigger additional mismatches with less inlining 595ifdef CONFIG_DEBUG_SECTION_MISMATCH 596KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) 597endif 598 599# arch Makefile may override CC so keep this after arch Makefile is included 600NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) 601CHECKFLAGS += $(NOSTDINC_FLAGS) 602 603# warn about C99 declaration after statement 604KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,) 605 606# disable pointer signed / unsigned warnings in gcc 4.0 607KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,) 608 609# disable invalid "can't wrap" optimizations for signed / pointers 610KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow) 611 612# conserve stack if available 613KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) 614 615# check for 'asm goto' 616ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y) 617 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO 618endif 619 620# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments 621# But warn user when we do so 622warn-assign = \ 623$(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)") 624 625ifneq ($(KCPPFLAGS),) 626 $(call warn-assign,CPPFLAGS) 627 KBUILD_CPPFLAGS += $(KCPPFLAGS) 628endif 629ifneq ($(KAFLAGS),) 630 $(call warn-assign,AFLAGS) 631 KBUILD_AFLAGS += $(KAFLAGS) 632endif 633ifneq ($(KCFLAGS),) 634 $(call warn-assign,CFLAGS) 635 KBUILD_CFLAGS += $(KCFLAGS) 636endif 637 638# Use --build-id when available. 639LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\ 640 $(call cc-ldoption, -Wl$(comma)--build-id,)) 641KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID) 642LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID) 643 644ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 645LDFLAGS_vmlinux += $(call ld-option, -X,) 646endif 647 648# Default kernel image to build when no specific target is given. 649# KBUILD_IMAGE may be overruled on the command line or 650# set in the environment 651# Also any assignments in arch/$(ARCH)/Makefile take precedence over 652# this default value 653export KBUILD_IMAGE ?= vmlinux 654 655# 656# INSTALL_PATH specifies where to place the updated kernel and system map 657# images. Default is /boot, but you can set it to other values 658export INSTALL_PATH ?= /boot 659 660# 661# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 662# relocations required by build roots. This is not defined in the 663# makefile but the argument can be passed to make if needed. 664# 665 666MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 667export MODLIB 668 669# 670# INSTALL_MOD_STRIP, if defined, will cause modules to be 671# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then 672# the default option --strip-debug will be used. Otherwise, 673# INSTALL_MOD_STRIP value will be used as the options to the strip command. 674 675ifdef INSTALL_MOD_STRIP 676ifeq ($(INSTALL_MOD_STRIP),1) 677mod_strip_cmd = $(STRIP) --strip-debug 678else 679mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP) 680endif # INSTALL_MOD_STRIP=1 681else 682mod_strip_cmd = true 683endif # INSTALL_MOD_STRIP 684export mod_strip_cmd 685 686 687ifeq ($(KBUILD_EXTMOD),) 688core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/ 689 690vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \ 691 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 692 $(net-y) $(net-m) $(libs-y) $(libs-m))) 693 694vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \ 695 $(init-n) $(init-) \ 696 $(core-n) $(core-) $(drivers-n) $(drivers-) \ 697 $(net-n) $(net-) $(libs-n) $(libs-)))) 698 699init-y := $(patsubst %/, %/built-in.o, $(init-y)) 700core-y := $(patsubst %/, %/built-in.o, $(core-y)) 701drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y)) 702net-y := $(patsubst %/, %/built-in.o, $(net-y)) 703libs-y1 := $(patsubst %/, %/lib.a, $(libs-y)) 704libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y)) 705libs-y := $(libs-y1) $(libs-y2) 706 707# Build vmlinux 708# --------------------------------------------------------------------------- 709# vmlinux is built from the objects selected by $(vmlinux-init) and 710# $(vmlinux-main). Most are built-in.o files from top-level directories 711# in the kernel tree, others are specified in arch/$(ARCH)/Makefile. 712# Ordering when linking is important, and $(vmlinux-init) must be first. 713# 714# vmlinux 715# ^ 716# | 717# +-< $(vmlinux-init) 718# | +--< init/version.o + more 719# | 720# +--< $(vmlinux-main) 721# | +--< driver/built-in.o mm/built-in.o + more 722# | 723# +-< kallsyms.o (see description in CONFIG_KALLSYMS section) 724# 725# vmlinux version (uname -v) cannot be updated during normal 726# descending-into-subdirs phase since we do not yet know if we need to 727# update vmlinux. 728# Therefore this step is delayed until just before final link of vmlinux - 729# except in the kallsyms case where it is done just before adding the 730# symbols to the kernel. 731# 732# System.map is generated to document addresses of all kernel symbols 733 734vmlinux-init := $(head-y) $(init-y) 735vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y) 736vmlinux-all := $(vmlinux-init) $(vmlinux-main) 737vmlinux-lds := arch/$(SRCARCH)/kernel/vmlinux.lds 738export KBUILD_VMLINUX_OBJS := $(vmlinux-all) 739 740# Rule to link vmlinux - also used during CONFIG_KALLSYMS 741# May be overridden by arch/$(ARCH)/Makefile 742quiet_cmd_vmlinux__ ?= LD $@ 743 cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \ 744 -T $(vmlinux-lds) $(vmlinux-init) \ 745 --start-group $(vmlinux-main) --end-group \ 746 $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^) 747 748# Generate new vmlinux version 749quiet_cmd_vmlinux_version = GEN .version 750 cmd_vmlinux_version = set -e; \ 751 if [ ! -r .version ]; then \ 752 rm -f .version; \ 753 echo 1 >.version; \ 754 else \ 755 mv .version .old_version; \ 756 expr 0$$(cat .old_version) + 1 >.version; \ 757 fi; \ 758 $(MAKE) $(build)=init 759 760# Generate System.map 761quiet_cmd_sysmap = SYSMAP 762 cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap 763 764# Link of vmlinux 765# If CONFIG_KALLSYMS is set .version is already updated 766# Generate System.map and verify that the content is consistent 767# Use + in front of the vmlinux_version rule to silent warning with make -j2 768# First command is ':' to allow us to use + in front of the rule 769define rule_vmlinux__ 770 : 771 $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version)) 772 773 $(call cmd,vmlinux__) 774 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd 775 776 $(Q)$(if $($(quiet)cmd_sysmap), \ 777 echo ' $($(quiet)cmd_sysmap) System.map' &&) \ 778 $(cmd_sysmap) $@ System.map; \ 779 if [ $$? -ne 0 ]; then \ 780 rm -f $@; \ 781 /bin/false; \ 782 fi; 783 $(verify_kallsyms) 784endef 785 786 787ifdef CONFIG_KALLSYMS 788# Generate section listing all symbols and add it into vmlinux $(kallsyms.o) 789# It's a three stage process: 790# o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is 791# empty 792# Running kallsyms on that gives us .tmp_kallsyms1.o with 793# the right size - vmlinux version (uname -v) is updated during this step 794# o .tmp_vmlinux2 now has a __kallsyms section of the right size, 795# but due to the added section, some addresses have shifted. 796# From here, we generate a correct .tmp_kallsyms2.o 797# o The correct .tmp_kallsyms2.o is linked into the final vmlinux. 798# o Verify that the System.map from vmlinux matches the map from 799# .tmp_vmlinux2, just in case we did not generate kallsyms correctly. 800# o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using 801# .tmp_vmlinux3 and .tmp_kallsyms3.o. This is only meant as a 802# temporary bypass to allow the kernel to be built while the 803# maintainers work out what went wrong with kallsyms. 804 805ifdef CONFIG_KALLSYMS_EXTRA_PASS 806last_kallsyms := 3 807else 808last_kallsyms := 2 809endif 810 811kallsyms.o := .tmp_kallsyms$(last_kallsyms).o 812 813define verify_kallsyms 814 $(Q)$(if $($(quiet)cmd_sysmap), \ 815 echo ' $($(quiet)cmd_sysmap) .tmp_System.map' &&) \ 816 $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map 817 $(Q)cmp -s System.map .tmp_System.map || \ 818 (echo Inconsistent kallsyms data; \ 819 echo Try setting CONFIG_KALLSYMS_EXTRA_PASS; \ 820 rm .tmp_kallsyms* ; /bin/false ) 821endef 822 823# Update vmlinux version before link 824# Use + in front of this rule to silent warning about make -j1 825# First command is ':' to allow us to use + in front of this rule 826cmd_ksym_ld = $(cmd_vmlinux__) 827define rule_ksym_ld 828 : 829 +$(call cmd,vmlinux_version) 830 $(call cmd,vmlinux__) 831 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd 832endef 833 834# Generate .S file with all kernel symbols 835quiet_cmd_kallsyms = KSYM $@ 836 cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \ 837 $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@ 838 839.tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE 840 $(call if_changed_dep,as_o_S) 841 842.tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS) 843 $(call cmd,kallsyms) 844 845# .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version 846.tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE 847 $(call if_changed_rule,ksym_ld) 848 849.tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE 850 $(call if_changed,vmlinux__) 851 852.tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE 853 $(call if_changed,vmlinux__) 854 855# Needs to visit scripts/ before $(KALLSYMS) can be used. 856$(KALLSYMS): scripts ; 857 858# Generate some data for debugging strange kallsyms problems 859debug_kallsyms: .tmp_map$(last_kallsyms) 860 861.tmp_map%: .tmp_vmlinux% FORCE 862 ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@ 863 864.tmp_map3: .tmp_map2 865 866.tmp_map2: .tmp_map1 867 868endif # ifdef CONFIG_KALLSYMS 869 870# Do modpost on a prelinked vmlinux. The finally linked vmlinux has 871# relevant sections renamed as per the linker script. 872quiet_cmd_vmlinux-modpost = LD $@ 873 cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@ \ 874 $(vmlinux-init) --start-group $(vmlinux-main) --end-group \ 875 $(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^) 876define rule_vmlinux-modpost 877 : 878 +$(call cmd,vmlinux-modpost) 879 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@ 880 $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd 881endef 882 883# vmlinux image - including updated kernel symbols 884vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) FORCE 885ifdef CONFIG_HEADERS_CHECK 886 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check 887endif 888ifdef CONFIG_SAMPLES 889 $(Q)$(MAKE) $(build)=samples 890endif 891ifdef CONFIG_BUILD_DOCSRC 892 $(Q)$(MAKE) $(build)=Documentation 893endif 894 $(call vmlinux-modpost) 895 $(call if_changed_rule,vmlinux__) 896 $(Q)rm -f .old_version 897 898# build vmlinux.o first to catch section mismatch errors early 899ifdef CONFIG_KALLSYMS 900.tmp_vmlinux1: vmlinux.o 901endif 902 903modpost-init := $(filter-out init/built-in.o, $(vmlinux-init)) 904vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE 905 $(call if_changed_rule,vmlinux-modpost) 906 907# The actual objects are generated when descending, 908# make sure no implicit rule kicks in 909$(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ; 910 911# Handle descending into subdirectories listed in $(vmlinux-dirs) 912# Preset locale variables to speed up the build process. Limit locale 913# tweaks to this spot to avoid wrong language settings when running 914# make menuconfig etc. 915# Error messages still appears in the original language 916 917PHONY += $(vmlinux-dirs) 918$(vmlinux-dirs): prepare scripts 919 $(Q)$(MAKE) $(build)=$@ 920 921# Store (new) KERNELRELASE string in include/config/kernel.release 922include/config/kernel.release: include/config/auto.conf FORCE 923 $(Q)rm -f $@ 924 $(Q)echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" > $@ 925 926 927# Things we need to do before we recursively start building the kernel 928# or the modules are listed in "prepare". 929# A multi level approach is used. prepareN is processed before prepareN-1. 930# archprepare is used in arch Makefiles and when processed asm symlink, 931# version.h and scripts_basic is processed / created. 932 933# Listed in dependency order 934PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3 935 936# prepare3 is used to check if we are building in a separate output directory, 937# and if so do: 938# 1) Check that make has not been executed in the kernel src $(srctree) 939prepare3: include/config/kernel.release 940ifneq ($(KBUILD_SRC),) 941 @$(kecho) ' Using $(srctree) as source for kernel' 942 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \ 943 echo " $(srctree) is not clean, please run 'make mrproper'";\ 944 echo " in the '$(srctree)' directory.";\ 945 /bin/false; \ 946 fi; 947endif 948 949# prepare2 creates a makefile if using a separate output directory 950prepare2: prepare3 outputmakefile 951 952prepare1: prepare2 include/linux/version.h include/generated/utsrelease.h \ 953 include/config/auto.conf 954 $(cmd_crmodverdir) 955 956archprepare: prepare1 scripts_basic 957 958prepare0: archprepare FORCE 959 $(Q)$(MAKE) $(build)=. 960 $(Q)$(MAKE) $(build)=. missing-syscalls 961 962# All the preparing.. 963prepare: prepare0 964 965# Generate some files 966# --------------------------------------------------------------------------- 967 968# KERNELRELEASE can change from a few different places, meaning version.h 969# needs to be updated, so this check is forced on all builds 970 971uts_len := 64 972define filechk_utsrelease.h 973 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 974 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 975 exit 1; \ 976 fi; \ 977 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";) 978endef 979 980define filechk_version.h 981 (echo \#define LINUX_VERSION_CODE $(shell \ 982 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \ 983 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';) 984endef 985 986include/linux/version.h: $(srctree)/Makefile FORCE 987 $(call filechk,version.h) 988 989include/generated/utsrelease.h: include/config/kernel.release FORCE 990 $(call filechk,utsrelease.h) 991 992PHONY += headerdep 993headerdep: 994 $(Q)find include/ -name '*.h' | xargs --max-args 1 scripts/headerdep.pl 995 996# --------------------------------------------------------------------------- 997 998PHONY += depend dep 999depend dep: 1000 @echo '*** Warning: make $@ is unnecessary now.' 1001 1002# --------------------------------------------------------------------------- 1003# Firmware install 1004INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware 1005export INSTALL_FW_PATH 1006 1007PHONY += firmware_install 1008firmware_install: FORCE 1009 @mkdir -p $(objtree)/firmware 1010 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install 1011 1012# --------------------------------------------------------------------------- 1013# Kernel headers 1014 1015#Default location for installed headers 1016export INSTALL_HDR_PATH = $(objtree)/usr 1017 1018hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj 1019 1020# If we do an all arch process set dst to asm-$(hdr-arch) 1021hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm) 1022 1023PHONY += __headers 1024__headers: include/linux/version.h scripts_basic FORCE 1025 $(Q)$(MAKE) $(build)=scripts build_unifdef 1026 1027PHONY += headers_install_all 1028headers_install_all: 1029 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install 1030 1031PHONY += headers_install 1032headers_install: __headers 1033 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/asm/Kbuild),, \ 1034 $(error Headers not exportable for the $(SRCARCH) architecture)) 1035 $(Q)$(MAKE) $(hdr-inst)=include 1036 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst) 1037 1038PHONY += headers_check_all 1039headers_check_all: headers_install_all 1040 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check 1041 1042PHONY += headers_check 1043headers_check: headers_install 1044 $(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1 1045 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst) HDRCHECK=1 1046 1047# --------------------------------------------------------------------------- 1048# Modules 1049 1050ifdef CONFIG_MODULES 1051 1052# By default, build modules as well 1053 1054all: modules 1055 1056# Build modules 1057# 1058# A module can be listed more than once in obj-m resulting in 1059# duplicate lines in modules.order files. Those are removed 1060# using awk while concatenating to the final file. 1061 1062PHONY += modules 1063modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin 1064 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order 1065 @$(kecho) ' Building modules, stage 2.'; 1066 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1067 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild 1068 1069modules.builtin: $(vmlinux-dirs:%=%/modules.builtin) 1070 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin 1071 1072%/modules.builtin: include/config/auto.conf 1073 $(Q)$(MAKE) $(modbuiltin)=$* 1074 1075 1076# Target to prepare building external modules 1077PHONY += modules_prepare 1078modules_prepare: prepare scripts 1079 1080# Target to install modules 1081PHONY += modules_install 1082modules_install: _modinst_ _modinst_post 1083 1084PHONY += _modinst_ 1085_modinst_: 1086 @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \ 1087 echo "Warning: you may need to install module-init-tools"; \ 1088 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\ 1089 sleep 1; \ 1090 fi 1091 @rm -rf $(MODLIB)/kernel 1092 @rm -f $(MODLIB)/source 1093 @mkdir -p $(MODLIB)/kernel 1094 @ln -s $(srctree) $(MODLIB)/source 1095 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1096 rm -f $(MODLIB)/build ; \ 1097 ln -s $(objtree) $(MODLIB)/build ; \ 1098 fi 1099 @cp -f $(objtree)/modules.order $(MODLIB)/ 1100 @cp -f $(objtree)/modules.builtin $(MODLIB)/ 1101 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1102 1103# This depmod is only for convenience to give the initial 1104# boot a modules.dep even before / is mounted read-write. However the 1105# boot script depmod is the master version. 1106PHONY += _modinst_post 1107_modinst_post: _modinst_ 1108 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst 1109 $(call cmd,depmod) 1110 1111else # CONFIG_MODULES 1112 1113# Modules not configured 1114# --------------------------------------------------------------------------- 1115 1116modules modules_install: FORCE 1117 @echo 1118 @echo "The present kernel configuration has modules disabled." 1119 @echo "Type 'make config' and enable loadable module support." 1120 @echo "Then build a kernel with module support enabled." 1121 @echo 1122 @exit 1 1123 1124endif # CONFIG_MODULES 1125 1126### 1127# Cleaning is done on three levels. 1128# make clean Delete most generated files 1129# Leave enough to build external modules 1130# make mrproper Delete the current configuration, and all generated files 1131# make distclean Remove editor backup files, patch leftover files and the like 1132 1133# Directories & files removed with 'make clean' 1134CLEAN_DIRS += $(MODVERDIR) 1135CLEAN_FILES += vmlinux System.map \ 1136 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map 1137 1138# Directories & files removed with 'make mrproper' 1139MRPROPER_DIRS += include/config usr/include include/generated 1140MRPROPER_FILES += .config .config.old .version .old_version \ 1141 include/linux/version.h \ 1142 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS 1143 1144# clean - Delete most, but leave enough to build external modules 1145# 1146clean: rm-dirs := $(CLEAN_DIRS) 1147clean: rm-files := $(CLEAN_FILES) 1148clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation) 1149 1150PHONY += $(clean-dirs) clean archclean 1151$(clean-dirs): 1152 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1153 1154clean: archclean 1155 1156# mrproper - Delete all generated files, including .config 1157# 1158mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS)) 1159mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1160mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts) 1161 1162PHONY += $(mrproper-dirs) mrproper archmrproper 1163$(mrproper-dirs): 1164 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1165 1166mrproper: clean archmrproper $(mrproper-dirs) 1167 $(call cmd,rmdirs) 1168 $(call cmd,rmfiles) 1169 1170# distclean 1171# 1172PHONY += distclean 1173 1174distclean: mrproper 1175 @find $(srctree) $(RCS_FIND_IGNORE) \ 1176 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1177 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \ 1178 -o -name '.*.rej' -o -size 0 \ 1179 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \ 1180 -type f -print | xargs rm -f 1181 1182 1183# Packaging of the kernel to various formats 1184# --------------------------------------------------------------------------- 1185# rpm target kept for backward compatibility 1186package-dir := $(srctree)/scripts/package 1187 1188%src-pkg: FORCE 1189 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1190%pkg: include/config/kernel.release FORCE 1191 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1192rpm: include/config/kernel.release FORCE 1193 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1194 1195 1196# Brief documentation of the typical targets used 1197# --------------------------------------------------------------------------- 1198 1199boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1200boards := $(notdir $(boards)) 1201board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1202board-dirs := $(sort $(notdir $(board-dirs:/=))) 1203 1204help: 1205 @echo 'Cleaning targets:' 1206 @echo ' clean - Remove most generated files but keep the config and' 1207 @echo ' enough build support to build external modules' 1208 @echo ' mrproper - Remove all generated files + config + various backup files' 1209 @echo ' distclean - mrproper + remove editor backup and patch files' 1210 @echo '' 1211 @echo 'Configuration targets:' 1212 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1213 @echo '' 1214 @echo 'Other generic targets:' 1215 @echo ' all - Build all targets marked with [*]' 1216 @echo '* vmlinux - Build the bare kernel' 1217 @echo '* modules - Build all modules' 1218 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1219 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH' 1220 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)' 1221 @echo ' dir/ - Build all files in dir and below' 1222 @echo ' dir/file.[oisS] - Build specified target only' 1223 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1224 @echo ' (requires a recent binutils and recent build (System.map))' 1225 @echo ' dir/file.ko - Build module including final link' 1226 @echo ' modules_prepare - Set up for building external modules' 1227 @echo ' tags/TAGS - Generate tags file for editors' 1228 @echo ' cscope - Generate cscope index' 1229 @echo ' gtags - Generate GNU GLOBAL index' 1230 @echo ' kernelrelease - Output the release version string' 1231 @echo ' kernelversion - Output the version stored in Makefile' 1232 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1233 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1234 echo '' 1235 @echo 'Static analysers' 1236 @echo ' checkstack - Generate a list of stack hogs' 1237 @echo ' namespacecheck - Name space analysis on compiled kernel' 1238 @echo ' versioncheck - Sanity check on version.h usage' 1239 @echo ' includecheck - Check for duplicate included header files' 1240 @echo ' export_report - List the usages of all exported symbols' 1241 @echo ' headers_check - Sanity check on exported headers' 1242 @echo ' headerdep - Detect inclusion cycles in headers' 1243 @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help 1244 @echo '' 1245 @echo 'Kernel packaging:' 1246 @$(MAKE) $(build)=$(package-dir) help 1247 @echo '' 1248 @echo 'Documentation targets:' 1249 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp 1250 @echo '' 1251 @echo 'Architecture specific targets ($(SRCARCH)):' 1252 @$(if $(archhelp),$(archhelp),\ 1253 echo ' No architecture specific help defined for $(SRCARCH)') 1254 @echo '' 1255 @$(if $(boards), \ 1256 $(foreach b, $(boards), \ 1257 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1258 echo '') 1259 @$(if $(board-dirs), \ 1260 $(foreach b, $(board-dirs), \ 1261 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1262 printf " %-16s - Show all of the above\\n" help-boards; \ 1263 echo '') 1264 1265 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1266 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1267 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1268 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)' 1269 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1270 @echo ' make W=1 [targets] Enable extra gcc checks' 1271 @echo '' 1272 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1273 @echo 'For further info see the ./README file' 1274 1275 1276help-board-dirs := $(addprefix help-,$(board-dirs)) 1277 1278help-boards: $(help-board-dirs) 1279 1280boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)) 1281 1282$(help-board-dirs): help-%: 1283 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1284 @$(if $(boards-per-dir), \ 1285 $(foreach b, $(boards-per-dir), \ 1286 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1287 echo '') 1288 1289 1290# Documentation targets 1291# --------------------------------------------------------------------------- 1292%docs: scripts_basic FORCE 1293 $(Q)$(MAKE) $(build)=Documentation/DocBook $@ 1294 1295else # KBUILD_EXTMOD 1296 1297### 1298# External module support. 1299# When building external modules the kernel used as basis is considered 1300# read-only, and no consistency checks are made and the make 1301# system is not used on the basis kernel. If updates are required 1302# in the basis kernel ordinary make commands (without M=...) must 1303# be used. 1304# 1305# The following are the only valid targets when building external 1306# modules. 1307# make M=dir clean Delete all automatically generated files 1308# make M=dir modules Make all modules in specified dir 1309# make M=dir Same as 'make M=dir modules' 1310# make M=dir modules_install 1311# Install the modules built in the module directory 1312# Assumes install directory is already created 1313 1314# We are always building modules 1315KBUILD_MODULES := 1 1316PHONY += crmodverdir 1317crmodverdir: 1318 $(cmd_crmodverdir) 1319 1320PHONY += $(objtree)/Module.symvers 1321$(objtree)/Module.symvers: 1322 @test -e $(objtree)/Module.symvers || ( \ 1323 echo; \ 1324 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \ 1325 echo " is missing; modules will have no dependencies and modversions."; \ 1326 echo ) 1327 1328module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD)) 1329PHONY += $(module-dirs) modules 1330$(module-dirs): crmodverdir $(objtree)/Module.symvers 1331 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@) 1332 1333modules: $(module-dirs) 1334 @$(kecho) ' Building modules, stage 2.'; 1335 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1336 1337PHONY += modules_install 1338modules_install: _emodinst_ _emodinst_post 1339 1340install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra) 1341PHONY += _emodinst_ 1342_emodinst_: 1343 $(Q)mkdir -p $(MODLIB)/$(install-dir) 1344 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1345 1346PHONY += _emodinst_post 1347_emodinst_post: _emodinst_ 1348 $(call cmd,depmod) 1349 1350clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD)) 1351 1352PHONY += $(clean-dirs) clean 1353$(clean-dirs): 1354 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1355 1356clean: rm-dirs := $(MODVERDIR) 1357clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers 1358 1359help: 1360 @echo ' Building external modules.' 1361 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1362 @echo '' 1363 @echo ' modules - default target, build the module(s)' 1364 @echo ' modules_install - install the module' 1365 @echo ' clean - remove generated files in module directory only' 1366 @echo '' 1367 1368# Dummies... 1369PHONY += prepare scripts 1370prepare: ; 1371scripts: ; 1372endif # KBUILD_EXTMOD 1373 1374clean: $(clean-dirs) 1375 $(call cmd,rmdirs) 1376 $(call cmd,rmfiles) 1377 @find $(or $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1378 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \ 1379 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1380 -o -name '*.symtypes' -o -name 'modules.order' \ 1381 -o -name modules.builtin -o -name '.tmp_*.o.*' \ 1382 -o -name '*.gcno' \) -type f -print | xargs rm -f 1383 1384# Generate tags for editors 1385# --------------------------------------------------------------------------- 1386quiet_cmd_tags = GEN $@ 1387 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@ 1388 1389tags TAGS cscope gtags: FORCE 1390 $(call cmd,tags) 1391 1392# Scripts to check various things for consistency 1393# --------------------------------------------------------------------------- 1394 1395includecheck: 1396 find * $(RCS_FIND_IGNORE) \ 1397 -name '*.[hcS]' -type f -print | sort \ 1398 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1399 1400versioncheck: 1401 find * $(RCS_FIND_IGNORE) \ 1402 -name '*.[hcS]' -type f -print | sort \ 1403 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1404 1405coccicheck: 1406 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@ 1407 1408namespacecheck: 1409 $(PERL) $(srctree)/scripts/namespace.pl 1410 1411export_report: 1412 $(PERL) $(srctree)/scripts/export_report.pl 1413 1414endif #ifeq ($(config-targets),1) 1415endif #ifeq ($(mixed-targets),1) 1416 1417PHONY += checkstack kernelrelease kernelversion 1418 1419# UML needs a little special treatment here. It wants to use the host 1420# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1421# else wants $(ARCH), including people doing cross-builds, which means 1422# that $(SUBARCH) doesn't work here. 1423ifeq ($(ARCH), um) 1424CHECKSTACK_ARCH := $(SUBARCH) 1425else 1426CHECKSTACK_ARCH := $(ARCH) 1427endif 1428checkstack: 1429 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1430 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1431 1432kernelrelease: 1433 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1434 1435kernelversion: 1436 @echo $(KERNELVERSION) 1437 1438# Single targets 1439# --------------------------------------------------------------------------- 1440# Single targets are compatible with: 1441# - build with mixed source and output 1442# - build with separate output dir 'make O=...' 1443# - external modules 1444# 1445# target-dir => where to store outputfile 1446# build-dir => directory in kernel source tree to use 1447 1448ifeq ($(KBUILD_EXTMOD),) 1449 build-dir = $(patsubst %/,%,$(dir $@)) 1450 target-dir = $(dir $@) 1451else 1452 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@))) 1453 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash)) 1454 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@)) 1455endif 1456 1457%.s: %.c prepare scripts FORCE 1458 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1459%.i: %.c prepare scripts FORCE 1460 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1461%.o: %.c prepare scripts FORCE 1462 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1463%.lst: %.c prepare scripts FORCE 1464 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1465%.s: %.S prepare scripts FORCE 1466 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1467%.o: %.S prepare scripts FORCE 1468 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1469%.symtypes: %.c prepare scripts FORCE 1470 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1471 1472# Modules 1473/: prepare scripts FORCE 1474 $(cmd_crmodverdir) 1475 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1476 $(build)=$(build-dir) 1477%/: prepare scripts FORCE 1478 $(cmd_crmodverdir) 1479 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1480 $(build)=$(build-dir) 1481%.ko: prepare scripts FORCE 1482 $(cmd_crmodverdir) 1483 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1484 $(build)=$(build-dir) $(@:.ko=.o) 1485 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1486 1487# FIXME Should go into a make.lib or something 1488# =========================================================================== 1489 1490quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs))) 1491 cmd_rmdirs = rm -rf $(rm-dirs) 1492 1493quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1494 cmd_rmfiles = rm -f $(rm-files) 1495 1496# Run depmod only if we have System.map and depmod is executable 1497quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) 1498 cmd_depmod = \ 1499 if [ -r System.map -a -x $(DEPMOD) ]; then \ 1500 $(DEPMOD) -ae -F System.map \ 1501 $(if $(strip $(INSTALL_MOD_PATH)), -b $(INSTALL_MOD_PATH) ) \ 1502 $(KERNELRELEASE); \ 1503 fi 1504 1505# Create temporary dir for module support files 1506# clean it up only when building all modules 1507cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \ 1508 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*) 1509 1510a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \ 1511 $(KBUILD_AFLAGS_KERNEL) \ 1512 $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(KBUILD_CPPFLAGS) \ 1513 $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o) 1514 1515quiet_cmd_as_o_S = AS $@ 1516cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $< 1517 1518# read all saved command lines 1519 1520targets := $(wildcard $(sort $(targets))) 1521cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd)) 1522 1523ifneq ($(cmd_files),) 1524 $(cmd_files): ; # Do not try to update included dependency files 1525 include $(cmd_files) 1526endif 1527 1528# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir 1529# Usage: 1530# $(Q)$(MAKE) $(clean)=dir 1531clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj 1532 1533endif # skip-makefile 1534 1535PHONY += FORCE 1536FORCE: 1537 1538# Declare the contents of the .PHONY variable as phony. We keep that 1539# information in a variable so we can use it in if_changed and friends. 1540.PHONY: $(PHONY) 1541