1VERSION = 3 2PATCHLEVEL = 6 3SUBLEVEL = 0 4EXTRAVERSION = 5NAME = Terrified Chipmunk 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 := $(W) 107endif 108 109# That's our default target when none is given on the command line 110PHONY := _all 111_all: 112 113# Cancel implicit rules on top Makefile 114$(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# Additional ARCH settings for tile 224ifeq ($(ARCH),tilepro) 225 SRCARCH := tile 226endif 227ifeq ($(ARCH),tilegx) 228 SRCARCH := tile 229endif 230 231# Where to locate arch specific headers 232hdr-arch := $(SRCARCH) 233 234KCONFIG_CONFIG ?= .config 235export KCONFIG_CONFIG 236 237# SHELL used by kbuild 238CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \ 239 else if [ -x /bin/bash ]; then echo /bin/bash; \ 240 else echo sh; fi ; fi) 241 242HOSTCC = gcc 243HOSTCXX = g++ 244HOSTCFLAGS = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer 245HOSTCXXFLAGS = -O2 246 247# Decide whether to build built-in, modular, or both. 248# Normally, just do built-in. 249 250KBUILD_MODULES := 251KBUILD_BUILTIN := 1 252 253# If we have only "make modules", don't compile built-in objects. 254# When we're building modules with modversions, we need to consider 255# the built-in objects during the descend as well, in order to 256# make sure the checksums are up to date before we record them. 257 258ifeq ($(MAKECMDGOALS),modules) 259 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1) 260endif 261 262# If we have "make <whatever> modules", compile modules 263# in addition to whatever we do anyway. 264# Just "make" or "make all" shall build modules as well 265 266ifneq ($(filter all _all modules,$(MAKECMDGOALS)),) 267 KBUILD_MODULES := 1 268endif 269 270ifeq ($(MAKECMDGOALS),) 271 KBUILD_MODULES := 1 272endif 273 274export KBUILD_MODULES KBUILD_BUILTIN 275export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD 276 277# Beautify output 278# --------------------------------------------------------------------------- 279# 280# Normally, we echo the whole command before executing it. By making 281# that echo $($(quiet)$(cmd)), we now have the possibility to set 282# $(quiet) to choose other forms of output instead, e.g. 283# 284# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@ 285# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< 286# 287# If $(quiet) is empty, the whole command will be printed. 288# If it is set to "quiet_", only the short version will be printed. 289# If it is set to "silent_", nothing will be printed at all, since 290# the variable $(silent_cmd_cc_o_c) doesn't exist. 291# 292# A simple variant is to prefix commands with $(Q) - that's useful 293# for commands that shall be hidden in non-verbose mode. 294# 295# $(Q)ln $@ :< 296# 297# If KBUILD_VERBOSE equals 0 then the above command will be hidden. 298# If KBUILD_VERBOSE equals 1 then the above command is displayed. 299 300ifeq ($(KBUILD_VERBOSE),1) 301 quiet = 302 Q = 303else 304 quiet=quiet_ 305 Q = @ 306endif 307 308# If the user is running make -s (silent mode), suppress echoing of 309# commands 310 311ifneq ($(filter s% -s%,$(MAKEFLAGS)),) 312 quiet=silent_ 313endif 314 315export quiet Q KBUILD_VERBOSE 316 317 318# Look for make include files relative to root of kernel src 319MAKEFLAGS += --include-dir=$(srctree) 320 321# We need some generic definitions (do not try to remake the file). 322$(srctree)/scripts/Kbuild.include: ; 323include $(srctree)/scripts/Kbuild.include 324 325# Make variables (CC, etc...) 326 327AS = $(CROSS_COMPILE)as 328LD = $(CROSS_COMPILE)ld 329CC = $(CROSS_COMPILE)gcc 330CPP = $(CC) -E 331AR = $(CROSS_COMPILE)ar 332NM = $(CROSS_COMPILE)nm 333STRIP = $(CROSS_COMPILE)strip 334OBJCOPY = $(CROSS_COMPILE)objcopy 335OBJDUMP = $(CROSS_COMPILE)objdump 336AWK = awk 337GENKSYMS = scripts/genksyms/genksyms 338INSTALLKERNEL := installkernel 339DEPMOD = /sbin/depmod 340PERL = perl 341CHECK = sparse 342 343CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 344 -Wbitwise -Wno-return-void $(CF) 345CFLAGS_MODULE = 346AFLAGS_MODULE = 347LDFLAGS_MODULE = 348CFLAGS_KERNEL = 349AFLAGS_KERNEL = 350CFLAGS_GCOV = -fprofile-arcs -ftest-coverage 351 352 353# Use LINUXINCLUDE when you must reference the include/ directory. 354# Needed to be compatible with the O= option 355LINUXINCLUDE := -I$(srctree)/arch/$(hdr-arch)/include \ 356 -Iarch/$(hdr-arch)/include/generated -Iinclude \ 357 $(if $(KBUILD_SRC), -I$(srctree)/include) \ 358 -include $(srctree)/include/linux/kconfig.h 359 360KBUILD_CPPFLAGS := -D__KERNEL__ 361 362KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \ 363 -fno-strict-aliasing -fno-common \ 364 -Werror-implicit-function-declaration \ 365 -Wno-format-security \ 366 -fno-delete-null-pointer-checks 367KBUILD_AFLAGS_KERNEL := 368KBUILD_CFLAGS_KERNEL := 369KBUILD_AFLAGS := -D__ASSEMBLY__ 370KBUILD_AFLAGS_MODULE := -DMODULE 371KBUILD_CFLAGS_MODULE := -DMODULE 372KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds 373 374# Read KERNELRELEASE from include/config/kernel.release (if it exists) 375KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null) 376KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 377 378export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 379export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC 380export CPP AR NM STRIP OBJCOPY OBJDUMP 381export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE 382export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS 383 384export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS 385export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV 386export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 387export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 388export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 389export KBUILD_ARFLAGS 390 391# When compiling out-of-tree modules, put MODVERDIR in the module 392# tree rather than in the kernel tree. The kernel tree might 393# even be read-only. 394export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions 395 396# Files to ignore in find ... statements 397 398RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS \ 399 -o -name .pc -o -name .hg -o -name .git \) -prune -o 400export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 401 --exclude CVS --exclude .pc --exclude .hg --exclude .git 402 403# =========================================================================== 404# Rules shared between *config targets and build targets 405 406# Basic helpers built in scripts/ 407PHONY += scripts_basic 408scripts_basic: 409 $(Q)$(MAKE) $(build)=scripts/basic 410 $(Q)rm -f .tmp_quiet_recordmcount 411 412# To avoid any implicit rule to kick in, define an empty command. 413scripts/basic/%: scripts_basic ; 414 415PHONY += outputmakefile 416# outputmakefile generates a Makefile in the output directory, if using a 417# separate output directory. This allows convenient use of make in the 418# output directory. 419outputmakefile: 420ifneq ($(KBUILD_SRC),) 421 $(Q)ln -fsn $(srctree) source 422 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \ 423 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL) 424endif 425 426# Support for using generic headers in asm-generic 427PHONY += asm-generic 428asm-generic: 429 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \ 430 obj=arch/$(SRCARCH)/include/generated/asm 431 432# To make sure we do not include .config for any of the *config targets 433# catch them early, and hand them over to scripts/kconfig/Makefile 434# It is allowed to specify more targets when calling make, including 435# mixing *config targets and build targets. 436# For example 'make oldconfig all'. 437# Detect when mixed targets is specified, and make a second invocation 438# of make so .config is not included in this case either (for *config). 439 440no-dot-config-targets := clean mrproper distclean \ 441 cscope gtags TAGS tags help %docs check% coccicheck \ 442 include/linux/version.h headers_% archheaders archscripts \ 443 kernelversion %src-pkg 444 445config-targets := 0 446mixed-targets := 0 447dot-config := 1 448 449ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 450 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 451 dot-config := 0 452 endif 453endif 454 455ifeq ($(KBUILD_EXTMOD),) 456 ifneq ($(filter config %config,$(MAKECMDGOALS)),) 457 config-targets := 1 458 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),) 459 mixed-targets := 1 460 endif 461 endif 462endif 463 464ifeq ($(mixed-targets),1) 465# =========================================================================== 466# We're called with mixed targets (*config and build targets). 467# Handle them one by one. 468 469%:: FORCE 470 $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@ 471 472else 473ifeq ($(config-targets),1) 474# =========================================================================== 475# *config targets only - make sure prerequisites are updated, and descend 476# in scripts/kconfig to make the *config target 477 478# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 479# KBUILD_DEFCONFIG may point out an alternative default configuration 480# used for 'make defconfig' 481include $(srctree)/arch/$(SRCARCH)/Makefile 482export KBUILD_DEFCONFIG KBUILD_KCONFIG 483 484config: scripts_basic outputmakefile FORCE 485 $(Q)mkdir -p include/linux include/config 486 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 487 488%config: scripts_basic outputmakefile FORCE 489 $(Q)mkdir -p include/linux include/config 490 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 491 492else 493# =========================================================================== 494# Build targets only - this includes vmlinux, arch specific targets, clean 495# targets and others. In general all targets except *config targets. 496 497ifeq ($(KBUILD_EXTMOD),) 498# Additional helpers built in scripts/ 499# Carefully list dependencies so we do not try to build scripts twice 500# in parallel 501PHONY += scripts 502scripts: scripts_basic include/config/auto.conf include/config/tristate.conf 503 $(Q)$(MAKE) $(build)=$(@) 504 505# Objects we will link into vmlinux / subdirs we need to visit 506init-y := init/ 507drivers-y := drivers/ sound/ firmware/ 508net-y := net/ 509libs-y := lib/ 510core-y := usr/ 511endif # KBUILD_EXTMOD 512 513ifeq ($(dot-config),1) 514# Read in config 515-include include/config/auto.conf 516 517ifeq ($(KBUILD_EXTMOD),) 518# Read in dependencies to all Kconfig* files, make sure to run 519# oldconfig if changes are detected. 520-include include/config/auto.conf.cmd 521 522# To avoid any implicit rule to kick in, define an empty command 523$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ; 524 525# If .config is newer than include/config/auto.conf, someone tinkered 526# with it and forgot to run make oldconfig. 527# if auto.conf.cmd is missing then we are probably in a cleaned tree so 528# we execute the config step to be sure to catch updated Kconfig files 529include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd 530 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig 531else 532# external modules needs include/generated/autoconf.h and include/config/auto.conf 533# but do not care if they are up-to-date. Use auto.conf to trigger the test 534PHONY += include/config/auto.conf 535 536include/config/auto.conf: 537 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 538 echo >&2; \ 539 echo >&2 " ERROR: Kernel configuration is invalid."; \ 540 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 541 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 542 echo >&2 ; \ 543 /bin/false) 544 545endif # KBUILD_EXTMOD 546 547else 548# Dummy target needed, because used as prerequisite 549include/config/auto.conf: ; 550endif # $(dot-config) 551 552# The all: target is the default when no target is given on the 553# command line. 554# This allow a user to issue only 'make' to build a kernel including modules 555# Defaults to vmlinux, but the arch makefile usually adds further targets 556all: vmlinux 557 558ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 559KBUILD_CFLAGS += -Os 560else 561KBUILD_CFLAGS += -O2 562endif 563 564include $(srctree)/arch/$(SRCARCH)/Makefile 565 566ifdef CONFIG_READABLE_ASM 567# Disable optimizations that make assembler listings hard to read. 568# reorder blocks reorders the control in the function 569# ipa clone creates specialized cloned functions 570# partial inlining inlines only parts of functions 571KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \ 572 $(call cc-option,-fno-ipa-cp-clone,) \ 573 $(call cc-option,-fno-partial-inlining) 574endif 575 576ifneq ($(CONFIG_FRAME_WARN),0) 577KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN}) 578endif 579 580# Force gcc to behave correct even for buggy distributions 581ifndef CONFIG_CC_STACKPROTECTOR 582KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector) 583endif 584 585# This warning generated too much noise in a regular build. 586# Use make W=1 to enable this warning (see scripts/Makefile.build) 587KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable) 588 589ifdef CONFIG_FRAME_POINTER 590KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 591else 592# Some targets (ARM with Thumb2, for example), can't be built with frame 593# pointers. For those, we don't have FUNCTION_TRACER automatically 594# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 595# incompatible with -fomit-frame-pointer with current GCC, so we don't use 596# -fomit-frame-pointer with FUNCTION_TRACER. 597ifndef CONFIG_FUNCTION_TRACER 598KBUILD_CFLAGS += -fomit-frame-pointer 599endif 600endif 601 602ifdef CONFIG_DEBUG_INFO 603KBUILD_CFLAGS += -g 604KBUILD_AFLAGS += -gdwarf-2 605endif 606 607ifdef CONFIG_DEBUG_INFO_REDUCED 608KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) 609endif 610 611ifdef CONFIG_FUNCTION_TRACER 612ifdef CONFIG_HAVE_FENTRY 613CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY) 614endif 615KBUILD_CFLAGS += -pg $(CC_USING_FENTRY) 616KBUILD_AFLAGS += $(CC_USING_FENTRY) 617ifdef CONFIG_DYNAMIC_FTRACE 618 ifdef CONFIG_HAVE_C_RECORDMCOUNT 619 BUILD_C_RECORDMCOUNT := y 620 export BUILD_C_RECORDMCOUNT 621 endif 622endif 623endif 624 625# We trigger additional mismatches with less inlining 626ifdef CONFIG_DEBUG_SECTION_MISMATCH 627KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) 628endif 629 630# arch Makefile may override CC so keep this after arch Makefile is included 631NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) 632CHECKFLAGS += $(NOSTDINC_FLAGS) 633 634# warn about C99 declaration after statement 635KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,) 636 637# disable pointer signed / unsigned warnings in gcc 4.0 638KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign) 639 640# disable invalid "can't wrap" optimizations for signed / pointers 641KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow) 642 643# conserve stack if available 644KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) 645 646# use the deterministic mode of AR if available 647KBUILD_ARFLAGS := $(call ar-option,D) 648 649# check for 'asm goto' 650ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y) 651 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO 652endif 653 654# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments 655# But warn user when we do so 656warn-assign = \ 657$(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)") 658 659ifneq ($(KCPPFLAGS),) 660 $(call warn-assign,CPPFLAGS) 661 KBUILD_CPPFLAGS += $(KCPPFLAGS) 662endif 663ifneq ($(KAFLAGS),) 664 $(call warn-assign,AFLAGS) 665 KBUILD_AFLAGS += $(KAFLAGS) 666endif 667ifneq ($(KCFLAGS),) 668 $(call warn-assign,CFLAGS) 669 KBUILD_CFLAGS += $(KCFLAGS) 670endif 671 672# Use --build-id when available. 673LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\ 674 $(call cc-ldoption, -Wl$(comma)--build-id,)) 675KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID) 676LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID) 677 678ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 679LDFLAGS_vmlinux += $(call ld-option, -X,) 680endif 681 682# Default kernel image to build when no specific target is given. 683# KBUILD_IMAGE may be overruled on the command line or 684# set in the environment 685# Also any assignments in arch/$(ARCH)/Makefile take precedence over 686# this default value 687export KBUILD_IMAGE ?= vmlinux 688 689# 690# INSTALL_PATH specifies where to place the updated kernel and system map 691# images. Default is /boot, but you can set it to other values 692export INSTALL_PATH ?= /boot 693 694# 695# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 696# relocations required by build roots. This is not defined in the 697# makefile but the argument can be passed to make if needed. 698# 699 700MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 701export MODLIB 702 703# 704# INSTALL_MOD_STRIP, if defined, will cause modules to be 705# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then 706# the default option --strip-debug will be used. Otherwise, 707# INSTALL_MOD_STRIP value will be used as the options to the strip command. 708 709ifdef INSTALL_MOD_STRIP 710ifeq ($(INSTALL_MOD_STRIP),1) 711mod_strip_cmd = $(STRIP) --strip-debug 712else 713mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP) 714endif # INSTALL_MOD_STRIP=1 715else 716mod_strip_cmd = true 717endif # INSTALL_MOD_STRIP 718export mod_strip_cmd 719 720 721ifeq ($(KBUILD_EXTMOD),) 722core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/ 723 724vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \ 725 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 726 $(net-y) $(net-m) $(libs-y) $(libs-m))) 727 728vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \ 729 $(init-n) $(init-) \ 730 $(core-n) $(core-) $(drivers-n) $(drivers-) \ 731 $(net-n) $(net-) $(libs-n) $(libs-)))) 732 733init-y := $(patsubst %/, %/built-in.o, $(init-y)) 734core-y := $(patsubst %/, %/built-in.o, $(core-y)) 735drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y)) 736net-y := $(patsubst %/, %/built-in.o, $(net-y)) 737libs-y1 := $(patsubst %/, %/lib.a, $(libs-y)) 738libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y)) 739libs-y := $(libs-y1) $(libs-y2) 740 741# Externally visible symbols (used by link-vmlinux.sh) 742export KBUILD_VMLINUX_INIT := $(head-y) $(init-y) 743export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y) 744export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 745export LDFLAGS_vmlinux 746 747vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) 748 749# Final link of vmlinux 750 cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) 751quiet_cmd_link-vmlinux = LINK $@ 752 753# Include targets which we want to 754# execute if the rest of the kernel build went well. 755vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE 756ifdef CONFIG_HEADERS_CHECK 757 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check 758endif 759ifdef CONFIG_SAMPLES 760 $(Q)$(MAKE) $(build)=samples 761endif 762ifdef CONFIG_BUILD_DOCSRC 763 $(Q)$(MAKE) $(build)=Documentation 764endif 765 +$(call if_changed,link-vmlinux) 766 767# The actual objects are generated when descending, 768# make sure no implicit rule kicks in 769$(sort $(vmlinux-deps)): $(vmlinux-dirs) ; 770 771# Handle descending into subdirectories listed in $(vmlinux-dirs) 772# Preset locale variables to speed up the build process. Limit locale 773# tweaks to this spot to avoid wrong language settings when running 774# make menuconfig etc. 775# Error messages still appears in the original language 776 777PHONY += $(vmlinux-dirs) 778$(vmlinux-dirs): prepare scripts 779 $(Q)$(MAKE) $(build)=$@ 780 781# Store (new) KERNELRELASE string in include/config/kernel.release 782include/config/kernel.release: include/config/auto.conf FORCE 783 $(Q)rm -f $@ 784 $(Q)echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" > $@ 785 786 787# Things we need to do before we recursively start building the kernel 788# or the modules are listed in "prepare". 789# A multi level approach is used. prepareN is processed before prepareN-1. 790# archprepare is used in arch Makefiles and when processed asm symlink, 791# version.h and scripts_basic is processed / created. 792 793# Listed in dependency order 794PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3 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) 799prepare3: include/config/kernel.release 800ifneq ($(KBUILD_SRC),) 801 @$(kecho) ' Using $(srctree) as source for kernel' 802 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \ 803 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \ 804 echo >&2 " in the '$(srctree)' directory.";\ 805 /bin/false; \ 806 fi; 807endif 808 809# prepare2 creates a makefile if using a separate output directory 810prepare2: prepare3 outputmakefile asm-generic 811 812prepare1: prepare2 include/linux/version.h include/generated/utsrelease.h \ 813 include/config/auto.conf 814 $(cmd_crmodverdir) 815 816archprepare: archheaders archscripts prepare1 scripts_basic 817 818prepare0: archprepare FORCE 819 $(Q)$(MAKE) $(build)=. 820 821# All the preparing.. 822prepare: prepare0 823 824# Generate some files 825# --------------------------------------------------------------------------- 826 827# KERNELRELEASE can change from a few different places, meaning version.h 828# needs to be updated, so this check is forced on all builds 829 830uts_len := 64 831define filechk_utsrelease.h 832 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 833 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 834 exit 1; \ 835 fi; \ 836 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";) 837endef 838 839define filechk_version.h 840 (echo \#define LINUX_VERSION_CODE $(shell \ 841 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \ 842 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';) 843endef 844 845include/linux/version.h: $(srctree)/Makefile FORCE 846 $(call filechk,version.h) 847 848include/generated/utsrelease.h: include/config/kernel.release FORCE 849 $(call filechk,utsrelease.h) 850 851PHONY += headerdep 852headerdep: 853 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 854 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 855 856# --------------------------------------------------------------------------- 857 858PHONY += depend dep 859depend dep: 860 @echo '*** Warning: make $@ is unnecessary now.' 861 862# --------------------------------------------------------------------------- 863# Firmware install 864INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware 865export INSTALL_FW_PATH 866 867PHONY += firmware_install 868firmware_install: FORCE 869 @mkdir -p $(objtree)/firmware 870 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install 871 872# --------------------------------------------------------------------------- 873# Kernel headers 874 875#Default location for installed headers 876export INSTALL_HDR_PATH = $(objtree)/usr 877 878hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj 879 880# If we do an all arch process set dst to asm-$(hdr-arch) 881hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm) 882 883PHONY += archheaders 884archheaders: 885 886PHONY += archscripts 887archscripts: 888 889PHONY += __headers 890__headers: include/linux/version.h scripts_basic asm-generic archheaders archscripts FORCE 891 $(Q)$(MAKE) $(build)=scripts build_unifdef 892 893PHONY += headers_install_all 894headers_install_all: 895 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install 896 897PHONY += headers_install 898headers_install: __headers 899 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/asm/Kbuild),, \ 900 $(error Headers not exportable for the $(SRCARCH) architecture)) 901 $(Q)$(MAKE) $(hdr-inst)=include 902 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst) 903 904PHONY += headers_check_all 905headers_check_all: headers_install_all 906 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check 907 908PHONY += headers_check 909headers_check: headers_install 910 $(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1 911 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst) HDRCHECK=1 912 913# --------------------------------------------------------------------------- 914# Modules 915 916ifdef CONFIG_MODULES 917 918# By default, build modules as well 919 920all: modules 921 922# Build modules 923# 924# A module can be listed more than once in obj-m resulting in 925# duplicate lines in modules.order files. Those are removed 926# using awk while concatenating to the final file. 927 928PHONY += modules 929modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin 930 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order 931 @$(kecho) ' Building modules, stage 2.'; 932 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 933 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild 934 935modules.builtin: $(vmlinux-dirs:%=%/modules.builtin) 936 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin 937 938%/modules.builtin: include/config/auto.conf 939 $(Q)$(MAKE) $(modbuiltin)=$* 940 941 942# Target to prepare building external modules 943PHONY += modules_prepare 944modules_prepare: prepare scripts 945 946# Target to install modules 947PHONY += modules_install 948modules_install: _modinst_ _modinst_post 949 950PHONY += _modinst_ 951_modinst_: 952 @rm -rf $(MODLIB)/kernel 953 @rm -f $(MODLIB)/source 954 @mkdir -p $(MODLIB)/kernel 955 @ln -s $(srctree) $(MODLIB)/source 956 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 957 rm -f $(MODLIB)/build ; \ 958 ln -s $(objtree) $(MODLIB)/build ; \ 959 fi 960 @cp -f $(objtree)/modules.order $(MODLIB)/ 961 @cp -f $(objtree)/modules.builtin $(MODLIB)/ 962 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 963 964# This depmod is only for convenience to give the initial 965# boot a modules.dep even before / is mounted read-write. However the 966# boot script depmod is the master version. 967PHONY += _modinst_post 968_modinst_post: _modinst_ 969 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst 970 $(call cmd,depmod) 971 972else # CONFIG_MODULES 973 974# Modules not configured 975# --------------------------------------------------------------------------- 976 977modules modules_install: FORCE 978 @echo >&2 979 @echo >&2 "The present kernel configuration has modules disabled." 980 @echo >&2 "Type 'make config' and enable loadable module support." 981 @echo >&2 "Then build a kernel with module support enabled." 982 @echo >&2 983 @exit 1 984 985endif # CONFIG_MODULES 986 987### 988# Cleaning is done on three levels. 989# make clean Delete most generated files 990# Leave enough to build external modules 991# make mrproper Delete the current configuration, and all generated files 992# make distclean Remove editor backup files, patch leftover files and the like 993 994# Directories & files removed with 'make clean' 995CLEAN_DIRS += $(MODVERDIR) 996 997# Directories & files removed with 'make mrproper' 998MRPROPER_DIRS += include/config usr/include include/generated \ 999 arch/*/include/generated 1000MRPROPER_FILES += .config .config.old .version .old_version \ 1001 include/linux/version.h \ 1002 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS 1003 1004# clean - Delete most, but leave enough to build external modules 1005# 1006clean: rm-dirs := $(CLEAN_DIRS) 1007clean: rm-files := $(CLEAN_FILES) 1008clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples) 1009 1010PHONY += $(clean-dirs) clean archclean 1011$(clean-dirs): 1012 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1013 1014clean: archclean 1015 1016# mrproper - Delete all generated files, including .config 1017# 1018mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS)) 1019mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1020mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts) 1021 1022PHONY += $(mrproper-dirs) mrproper archmrproper 1023$(mrproper-dirs): 1024 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1025 1026mrproper: clean archmrproper $(mrproper-dirs) 1027 $(call cmd,rmdirs) 1028 $(call cmd,rmfiles) 1029 1030# distclean 1031# 1032PHONY += distclean 1033 1034distclean: mrproper 1035 @find $(srctree) $(RCS_FIND_IGNORE) \ 1036 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1037 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \ 1038 -o -name '.*.rej' \ 1039 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \ 1040 -type f -print | xargs rm -f 1041 1042 1043# Packaging of the kernel to various formats 1044# --------------------------------------------------------------------------- 1045# rpm target kept for backward compatibility 1046package-dir := $(srctree)/scripts/package 1047 1048%src-pkg: FORCE 1049 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1050%pkg: include/config/kernel.release FORCE 1051 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1052rpm: include/config/kernel.release FORCE 1053 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1054 1055 1056# Brief documentation of the typical targets used 1057# --------------------------------------------------------------------------- 1058 1059boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1060boards := $(notdir $(boards)) 1061board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1062board-dirs := $(sort $(notdir $(board-dirs:/=))) 1063 1064help: 1065 @echo 'Cleaning targets:' 1066 @echo ' clean - Remove most generated files but keep the config and' 1067 @echo ' enough build support to build external modules' 1068 @echo ' mrproper - Remove all generated files + config + various backup files' 1069 @echo ' distclean - mrproper + remove editor backup and patch files' 1070 @echo '' 1071 @echo 'Configuration targets:' 1072 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1073 @echo '' 1074 @echo 'Other generic targets:' 1075 @echo ' all - Build all targets marked with [*]' 1076 @echo '* vmlinux - Build the bare kernel' 1077 @echo '* modules - Build all modules' 1078 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1079 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH' 1080 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)' 1081 @echo ' dir/ - Build all files in dir and below' 1082 @echo ' dir/file.[oisS] - Build specified target only' 1083 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1084 @echo ' (requires a recent binutils and recent build (System.map))' 1085 @echo ' dir/file.ko - Build module including final link' 1086 @echo ' modules_prepare - Set up for building external modules' 1087 @echo ' tags/TAGS - Generate tags file for editors' 1088 @echo ' cscope - Generate cscope index' 1089 @echo ' gtags - Generate GNU GLOBAL index' 1090 @echo ' kernelrelease - Output the release version string' 1091 @echo ' kernelversion - Output the version stored in Makefile' 1092 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1093 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1094 echo '' 1095 @echo 'Static analysers' 1096 @echo ' checkstack - Generate a list of stack hogs' 1097 @echo ' namespacecheck - Name space analysis on compiled kernel' 1098 @echo ' versioncheck - Sanity check on version.h usage' 1099 @echo ' includecheck - Check for duplicate included header files' 1100 @echo ' export_report - List the usages of all exported symbols' 1101 @echo ' headers_check - Sanity check on exported headers' 1102 @echo ' headerdep - Detect inclusion cycles in headers' 1103 @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help 1104 @echo '' 1105 @echo 'Kernel packaging:' 1106 @$(MAKE) $(build)=$(package-dir) help 1107 @echo '' 1108 @echo 'Documentation targets:' 1109 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp 1110 @echo '' 1111 @echo 'Architecture specific targets ($(SRCARCH)):' 1112 @$(if $(archhelp),$(archhelp),\ 1113 echo ' No architecture specific help defined for $(SRCARCH)') 1114 @echo '' 1115 @$(if $(boards), \ 1116 $(foreach b, $(boards), \ 1117 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1118 echo '') 1119 @$(if $(board-dirs), \ 1120 $(foreach b, $(board-dirs), \ 1121 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1122 printf " %-16s - Show all of the above\\n" help-boards; \ 1123 echo '') 1124 1125 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1126 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1127 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1128 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)' 1129 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1130 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1131 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where' 1132 @echo ' 1: warnings which may be relevant and do not occur too often' 1133 @echo ' 2: warnings which occur quite often but may still be relevant' 1134 @echo ' 3: more obscure warnings, can most likely be ignored' 1135 @echo ' Multiple levels can be combined with W=12 or W=123' 1136 @echo '' 1137 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1138 @echo 'For further info see the ./README file' 1139 1140 1141help-board-dirs := $(addprefix help-,$(board-dirs)) 1142 1143help-boards: $(help-board-dirs) 1144 1145boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)) 1146 1147$(help-board-dirs): help-%: 1148 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1149 @$(if $(boards-per-dir), \ 1150 $(foreach b, $(boards-per-dir), \ 1151 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1152 echo '') 1153 1154 1155# Documentation targets 1156# --------------------------------------------------------------------------- 1157%docs: scripts_basic FORCE 1158 $(Q)$(MAKE) $(build)=scripts build_docproc 1159 $(Q)$(MAKE) $(build)=Documentation/DocBook $@ 1160 1161else # KBUILD_EXTMOD 1162 1163### 1164# External module support. 1165# When building external modules the kernel used as basis is considered 1166# read-only, and no consistency checks are made and the make 1167# system is not used on the basis kernel. If updates are required 1168# in the basis kernel ordinary make commands (without M=...) must 1169# be used. 1170# 1171# The following are the only valid targets when building external 1172# modules. 1173# make M=dir clean Delete all automatically generated files 1174# make M=dir modules Make all modules in specified dir 1175# make M=dir Same as 'make M=dir modules' 1176# make M=dir modules_install 1177# Install the modules built in the module directory 1178# Assumes install directory is already created 1179 1180# We are always building modules 1181KBUILD_MODULES := 1 1182PHONY += crmodverdir 1183crmodverdir: 1184 $(cmd_crmodverdir) 1185 1186PHONY += $(objtree)/Module.symvers 1187$(objtree)/Module.symvers: 1188 @test -e $(objtree)/Module.symvers || ( \ 1189 echo; \ 1190 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \ 1191 echo " is missing; modules will have no dependencies and modversions."; \ 1192 echo ) 1193 1194module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD)) 1195PHONY += $(module-dirs) modules 1196$(module-dirs): crmodverdir $(objtree)/Module.symvers 1197 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@) 1198 1199modules: $(module-dirs) 1200 @$(kecho) ' Building modules, stage 2.'; 1201 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1202 1203PHONY += modules_install 1204modules_install: _emodinst_ _emodinst_post 1205 1206install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra) 1207PHONY += _emodinst_ 1208_emodinst_: 1209 $(Q)mkdir -p $(MODLIB)/$(install-dir) 1210 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1211 1212PHONY += _emodinst_post 1213_emodinst_post: _emodinst_ 1214 $(call cmd,depmod) 1215 1216clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD)) 1217 1218PHONY += $(clean-dirs) clean 1219$(clean-dirs): 1220 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1221 1222clean: rm-dirs := $(MODVERDIR) 1223clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers 1224 1225help: 1226 @echo ' Building external modules.' 1227 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1228 @echo '' 1229 @echo ' modules - default target, build the module(s)' 1230 @echo ' modules_install - install the module' 1231 @echo ' clean - remove generated files in module directory only' 1232 @echo '' 1233 1234# Dummies... 1235PHONY += prepare scripts 1236prepare: ; 1237scripts: ; 1238endif # KBUILD_EXTMOD 1239 1240clean: $(clean-dirs) 1241 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1242 $(call cmd,rmdirs) 1243 $(call cmd,rmfiles) 1244 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1245 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \ 1246 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1247 -o -name '*.symtypes' -o -name 'modules.order' \ 1248 -o -name modules.builtin -o -name '.tmp_*.o.*' \ 1249 -o -name '*.gcno' \) -type f -print | xargs rm -f 1250 1251# Generate tags for editors 1252# --------------------------------------------------------------------------- 1253quiet_cmd_tags = GEN $@ 1254 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@ 1255 1256tags TAGS cscope gtags: FORCE 1257 $(call cmd,tags) 1258 1259# Scripts to check various things for consistency 1260# --------------------------------------------------------------------------- 1261 1262PHONY += includecheck versioncheck coccicheck namespacecheck export_report 1263 1264includecheck: 1265 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1266 -name '*.[hcS]' -type f -print | sort \ 1267 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1268 1269versioncheck: 1270 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1271 -name '*.[hcS]' -type f -print | sort \ 1272 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1273 1274coccicheck: 1275 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@ 1276 1277namespacecheck: 1278 $(PERL) $(srctree)/scripts/namespace.pl 1279 1280export_report: 1281 $(PERL) $(srctree)/scripts/export_report.pl 1282 1283endif #ifeq ($(config-targets),1) 1284endif #ifeq ($(mixed-targets),1) 1285 1286PHONY += checkstack kernelrelease kernelversion 1287 1288# UML needs a little special treatment here. It wants to use the host 1289# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1290# else wants $(ARCH), including people doing cross-builds, which means 1291# that $(SUBARCH) doesn't work here. 1292ifeq ($(ARCH), um) 1293CHECKSTACK_ARCH := $(SUBARCH) 1294else 1295CHECKSTACK_ARCH := $(ARCH) 1296endif 1297checkstack: 1298 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1299 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1300 1301kernelrelease: 1302 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1303 1304kernelversion: 1305 @echo $(KERNELVERSION) 1306 1307# Clear a bunch of variables before executing the submake 1308tools/: FORCE 1309 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS= -C $(src)/tools/ 1310 1311tools/%: FORCE 1312 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS= -C $(src)/tools/ $* 1313 1314# Single targets 1315# --------------------------------------------------------------------------- 1316# Single targets are compatible with: 1317# - build with mixed source and output 1318# - build with separate output dir 'make O=...' 1319# - external modules 1320# 1321# target-dir => where to store outputfile 1322# build-dir => directory in kernel source tree to use 1323 1324ifeq ($(KBUILD_EXTMOD),) 1325 build-dir = $(patsubst %/,%,$(dir $@)) 1326 target-dir = $(dir $@) 1327else 1328 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@))) 1329 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash)) 1330 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@)) 1331endif 1332 1333%.s: %.c prepare scripts FORCE 1334 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1335%.i: %.c prepare scripts FORCE 1336 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1337%.o: %.c prepare scripts FORCE 1338 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1339%.lst: %.c prepare scripts FORCE 1340 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1341%.s: %.S prepare scripts FORCE 1342 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1343%.o: %.S prepare scripts FORCE 1344 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1345%.symtypes: %.c prepare scripts FORCE 1346 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1347 1348# Modules 1349/: prepare scripts FORCE 1350 $(cmd_crmodverdir) 1351 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1352 $(build)=$(build-dir) 1353%/: prepare scripts FORCE 1354 $(cmd_crmodverdir) 1355 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1356 $(build)=$(build-dir) 1357%.ko: prepare scripts FORCE 1358 $(cmd_crmodverdir) 1359 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1360 $(build)=$(build-dir) $(@:.ko=.o) 1361 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1362 1363# FIXME Should go into a make.lib or something 1364# =========================================================================== 1365 1366quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs))) 1367 cmd_rmdirs = rm -rf $(rm-dirs) 1368 1369quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1370 cmd_rmfiles = rm -f $(rm-files) 1371 1372# Run depmod only if we have System.map and depmod is executable 1373quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) 1374 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1375 $(KERNELRELEASE) 1376 1377# Create temporary dir for module support files 1378# clean it up only when building all modules 1379cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \ 1380 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*) 1381 1382# read all saved command lines 1383 1384targets := $(wildcard $(sort $(targets))) 1385cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd)) 1386 1387ifneq ($(cmd_files),) 1388 $(cmd_files): ; # Do not try to update included dependency files 1389 include $(cmd_files) 1390endif 1391 1392# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir 1393# Usage: 1394# $(Q)$(MAKE) $(clean)=dir 1395clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj 1396 1397endif # skip-makefile 1398 1399PHONY += FORCE 1400FORCE: 1401 1402# Declare the contents of the .PHONY variable as phony. We keep that 1403# information in a variable so we can use it in if_changed and friends. 1404.PHONY: $(PHONY) 1405