1VERSION = 3 2PATCHLEVEL = 10 3SUBLEVEL = 0 4EXTRAVERSION = -rc1 5NAME = Unicycling Gorilla 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 @: 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/x86/ -e s/x86_64/x86/ \ 169 -e s/sun4u/sparc64/ \ 170 -e s/arm.*/arm/ -e s/sa110/arm/ \ 171 -e s/s390x/s390/ -e s/parisc64/parisc/ \ 172 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \ 173 -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ ) 174 175# Cross compiling and selecting different set of gcc/bin-utils 176# --------------------------------------------------------------------------- 177# 178# When performing cross compilation for other architectures ARCH shall be set 179# to the target architecture. (See arch/* for the possibilities). 180# ARCH can be set during invocation of make: 181# make ARCH=ia64 182# Another way is to have ARCH set in the environment. 183# The default ARCH is the host where make is executed. 184 185# CROSS_COMPILE specify the prefix used for all executables used 186# during compilation. Only gcc and related bin-utils executables 187# are prefixed with $(CROSS_COMPILE). 188# CROSS_COMPILE can be set on the command line 189# make CROSS_COMPILE=ia64-linux- 190# Alternatively CROSS_COMPILE can be set in the environment. 191# A third alternative is to store a setting in .config so that plain 192# "make" in the configured kernel build directory always uses that. 193# Default value for CROSS_COMPILE is not to prefix executables 194# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 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 $(CF) 345CFLAGS_MODULE = 346AFLAGS_MODULE = 347LDFLAGS_MODULE = 348CFLAGS_KERNEL = 349AFLAGS_KERNEL = 350CFLAGS_GCOV = -fprofile-arcs -ftest-coverage 351 352 353# Use USERINCLUDE when you must reference the UAPI directories only. 354USERINCLUDE := \ 355 -I$(srctree)/arch/$(hdr-arch)/include/uapi \ 356 -Iarch/$(hdr-arch)/include/generated/uapi \ 357 -I$(srctree)/include/uapi \ 358 -Iinclude/generated/uapi \ 359 -include $(srctree)/include/linux/kconfig.h 360 361# Use LINUXINCLUDE when you must reference the include/ directory. 362# Needed to be compatible with the O= option 363LINUXINCLUDE := \ 364 -I$(srctree)/arch/$(hdr-arch)/include \ 365 -Iarch/$(hdr-arch)/include/generated \ 366 $(if $(KBUILD_SRC), -I$(srctree)/include) \ 367 -Iinclude \ 368 $(USERINCLUDE) 369 370KBUILD_CPPFLAGS := -D__KERNEL__ 371 372KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \ 373 -fno-strict-aliasing -fno-common \ 374 -Werror-implicit-function-declaration \ 375 -Wno-format-security \ 376 -fno-delete-null-pointer-checks 377KBUILD_AFLAGS_KERNEL := 378KBUILD_CFLAGS_KERNEL := 379KBUILD_AFLAGS := -D__ASSEMBLY__ 380KBUILD_AFLAGS_MODULE := -DMODULE 381KBUILD_CFLAGS_MODULE := -DMODULE 382KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds 383 384# Read KERNELRELEASE from include/config/kernel.release (if it exists) 385KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null) 386KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 387 388export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 389export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC 390export CPP AR NM STRIP OBJCOPY OBJDUMP 391export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE 392export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS 393 394export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS 395export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV 396export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 397export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 398export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 399export KBUILD_ARFLAGS 400 401# When compiling out-of-tree modules, put MODVERDIR in the module 402# tree rather than in the kernel tree. The kernel tree might 403# even be read-only. 404export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions 405 406# Files to ignore in find ... statements 407 408RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS \ 409 -o -name .pc -o -name .hg -o -name .git \) -prune -o 410export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 411 --exclude CVS --exclude .pc --exclude .hg --exclude .git 412 413# =========================================================================== 414# Rules shared between *config targets and build targets 415 416# Basic helpers built in scripts/ 417PHONY += scripts_basic 418scripts_basic: 419 $(Q)$(MAKE) $(build)=scripts/basic 420 $(Q)rm -f .tmp_quiet_recordmcount 421 422# To avoid any implicit rule to kick in, define an empty command. 423scripts/basic/%: scripts_basic ; 424 425PHONY += outputmakefile 426# outputmakefile generates a Makefile in the output directory, if using a 427# separate output directory. This allows convenient use of make in the 428# output directory. 429outputmakefile: 430ifneq ($(KBUILD_SRC),) 431 $(Q)ln -fsn $(srctree) source 432 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \ 433 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL) 434endif 435 436# Support for using generic headers in asm-generic 437PHONY += asm-generic 438asm-generic: 439 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \ 440 src=asm obj=arch/$(SRCARCH)/include/generated/asm 441 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \ 442 src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm 443 444# To make sure we do not include .config for any of the *config targets 445# catch them early, and hand them over to scripts/kconfig/Makefile 446# It is allowed to specify more targets when calling make, including 447# mixing *config targets and build targets. 448# For example 'make oldconfig all'. 449# Detect when mixed targets is specified, and make a second invocation 450# of make so .config is not included in this case either (for *config). 451 452version_h := include/generated/uapi/linux/version.h 453 454no-dot-config-targets := clean mrproper distclean \ 455 cscope gtags TAGS tags help %docs check% coccicheck \ 456 $(version_h) headers_% archheaders archscripts \ 457 kernelversion %src-pkg 458 459config-targets := 0 460mixed-targets := 0 461dot-config := 1 462 463ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 464 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 465 dot-config := 0 466 endif 467endif 468 469ifeq ($(KBUILD_EXTMOD),) 470 ifneq ($(filter config %config,$(MAKECMDGOALS)),) 471 config-targets := 1 472 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),) 473 mixed-targets := 1 474 endif 475 endif 476endif 477 478ifeq ($(mixed-targets),1) 479# =========================================================================== 480# We're called with mixed targets (*config and build targets). 481# Handle them one by one. 482 483%:: FORCE 484 $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@ 485 486else 487ifeq ($(config-targets),1) 488# =========================================================================== 489# *config targets only - make sure prerequisites are updated, and descend 490# in scripts/kconfig to make the *config target 491 492# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 493# KBUILD_DEFCONFIG may point out an alternative default configuration 494# used for 'make defconfig' 495include $(srctree)/arch/$(SRCARCH)/Makefile 496export KBUILD_DEFCONFIG KBUILD_KCONFIG 497 498config: scripts_basic outputmakefile FORCE 499 $(Q)mkdir -p include/linux include/config 500 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 501 502%config: scripts_basic outputmakefile FORCE 503 $(Q)mkdir -p include/linux include/config 504 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 505 506else 507# =========================================================================== 508# Build targets only - this includes vmlinux, arch specific targets, clean 509# targets and others. In general all targets except *config targets. 510 511ifeq ($(KBUILD_EXTMOD),) 512# Additional helpers built in scripts/ 513# Carefully list dependencies so we do not try to build scripts twice 514# in parallel 515PHONY += scripts 516scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \ 517 asm-generic 518 $(Q)$(MAKE) $(build)=$(@) 519 520# Objects we will link into vmlinux / subdirs we need to visit 521init-y := init/ 522drivers-y := drivers/ sound/ firmware/ 523net-y := net/ 524libs-y := lib/ 525core-y := usr/ 526endif # KBUILD_EXTMOD 527 528ifeq ($(dot-config),1) 529# Read in config 530-include include/config/auto.conf 531 532ifeq ($(KBUILD_EXTMOD),) 533# Read in dependencies to all Kconfig* files, make sure to run 534# oldconfig if changes are detected. 535-include include/config/auto.conf.cmd 536 537# To avoid any implicit rule to kick in, define an empty command 538$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ; 539 540# If .config is newer than include/config/auto.conf, someone tinkered 541# with it and forgot to run make oldconfig. 542# if auto.conf.cmd is missing then we are probably in a cleaned tree so 543# we execute the config step to be sure to catch updated Kconfig files 544include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd 545 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig 546else 547# external modules needs include/generated/autoconf.h and include/config/auto.conf 548# but do not care if they are up-to-date. Use auto.conf to trigger the test 549PHONY += include/config/auto.conf 550 551include/config/auto.conf: 552 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 553 echo >&2; \ 554 echo >&2 " ERROR: Kernel configuration is invalid."; \ 555 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 556 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 557 echo >&2 ; \ 558 /bin/false) 559 560endif # KBUILD_EXTMOD 561 562else 563# Dummy target needed, because used as prerequisite 564include/config/auto.conf: ; 565endif # $(dot-config) 566 567# The all: target is the default when no target is given on the 568# command line. 569# This allow a user to issue only 'make' to build a kernel including modules 570# Defaults to vmlinux, but the arch makefile usually adds further targets 571all: vmlinux 572 573ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 574KBUILD_CFLAGS += -Os $(call cc-disable-warning,maybe-uninitialized,) 575else 576KBUILD_CFLAGS += -O2 577endif 578 579include $(srctree)/arch/$(SRCARCH)/Makefile 580 581ifdef CONFIG_READABLE_ASM 582# Disable optimizations that make assembler listings hard to read. 583# reorder blocks reorders the control in the function 584# ipa clone creates specialized cloned functions 585# partial inlining inlines only parts of functions 586KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \ 587 $(call cc-option,-fno-ipa-cp-clone,) \ 588 $(call cc-option,-fno-partial-inlining) 589endif 590 591ifneq ($(CONFIG_FRAME_WARN),0) 592KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN}) 593endif 594 595# Force gcc to behave correct even for buggy distributions 596ifndef CONFIG_CC_STACKPROTECTOR 597KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector) 598endif 599 600# This warning generated too much noise in a regular build. 601# Use make W=1 to enable this warning (see scripts/Makefile.build) 602KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable) 603 604ifdef CONFIG_FRAME_POINTER 605KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 606else 607# Some targets (ARM with Thumb2, for example), can't be built with frame 608# pointers. For those, we don't have FUNCTION_TRACER automatically 609# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 610# incompatible with -fomit-frame-pointer with current GCC, so we don't use 611# -fomit-frame-pointer with FUNCTION_TRACER. 612ifndef CONFIG_FUNCTION_TRACER 613KBUILD_CFLAGS += -fomit-frame-pointer 614endif 615endif 616 617ifdef CONFIG_DEBUG_INFO 618KBUILD_CFLAGS += -g 619KBUILD_AFLAGS += -gdwarf-2 620endif 621 622ifdef CONFIG_DEBUG_INFO_REDUCED 623KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \ 624 $(call cc-option,-fno-var-tracking) 625endif 626 627ifdef CONFIG_FUNCTION_TRACER 628ifdef CONFIG_HAVE_FENTRY 629CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY) 630endif 631KBUILD_CFLAGS += -pg $(CC_USING_FENTRY) 632KBUILD_AFLAGS += $(CC_USING_FENTRY) 633ifdef CONFIG_DYNAMIC_FTRACE 634 ifdef CONFIG_HAVE_C_RECORDMCOUNT 635 BUILD_C_RECORDMCOUNT := y 636 export BUILD_C_RECORDMCOUNT 637 endif 638endif 639endif 640 641# We trigger additional mismatches with less inlining 642ifdef CONFIG_DEBUG_SECTION_MISMATCH 643KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) 644endif 645 646# arch Makefile may override CC so keep this after arch Makefile is included 647NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) 648CHECKFLAGS += $(NOSTDINC_FLAGS) 649 650# warn about C99 declaration after statement 651KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,) 652 653# disable pointer signed / unsigned warnings in gcc 4.0 654KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign) 655 656# disable invalid "can't wrap" optimizations for signed / pointers 657KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow) 658 659# conserve stack if available 660KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) 661 662# use the deterministic mode of AR if available 663KBUILD_ARFLAGS := $(call ar-option,D) 664 665# check for 'asm goto' 666ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y) 667 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO 668endif 669 670# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments 671KBUILD_CPPFLAGS += $(KCPPFLAGS) 672KBUILD_AFLAGS += $(KAFLAGS) 673KBUILD_CFLAGS += $(KCFLAGS) 674 675# Use --build-id when available. 676LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\ 677 $(call cc-ldoption, -Wl$(comma)--build-id,)) 678KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID) 679LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID) 680 681ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 682LDFLAGS_vmlinux += $(call ld-option, -X,) 683endif 684 685# Default kernel image to build when no specific target is given. 686# KBUILD_IMAGE may be overruled on the command line or 687# set in the environment 688# Also any assignments in arch/$(ARCH)/Makefile take precedence over 689# this default value 690export KBUILD_IMAGE ?= vmlinux 691 692# 693# INSTALL_PATH specifies where to place the updated kernel and system map 694# images. Default is /boot, but you can set it to other values 695export INSTALL_PATH ?= /boot 696 697# 698# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 699# relocations required by build roots. This is not defined in the 700# makefile but the argument can be passed to make if needed. 701# 702 703MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 704export MODLIB 705 706# 707# INSTALL_MOD_STRIP, if defined, will cause modules to be 708# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then 709# the default option --strip-debug will be used. Otherwise, 710# INSTALL_MOD_STRIP value will be used as the options to the strip command. 711 712ifdef INSTALL_MOD_STRIP 713ifeq ($(INSTALL_MOD_STRIP),1) 714mod_strip_cmd = $(STRIP) --strip-debug 715else 716mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP) 717endif # INSTALL_MOD_STRIP=1 718else 719mod_strip_cmd = true 720endif # INSTALL_MOD_STRIP 721export mod_strip_cmd 722 723 724ifdef CONFIG_MODULE_SIG_ALL 725MODSECKEY = ./signing_key.priv 726MODPUBKEY = ./signing_key.x509 727export MODPUBKEY 728mod_sign_cmd = perl $(srctree)/scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODSECKEY) $(MODPUBKEY) 729else 730mod_sign_cmd = true 731endif 732export mod_sign_cmd 733 734 735ifeq ($(KBUILD_EXTMOD),) 736core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/ 737 738vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \ 739 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 740 $(net-y) $(net-m) $(libs-y) $(libs-m))) 741 742vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \ 743 $(init-n) $(init-) \ 744 $(core-n) $(core-) $(drivers-n) $(drivers-) \ 745 $(net-n) $(net-) $(libs-n) $(libs-)))) 746 747init-y := $(patsubst %/, %/built-in.o, $(init-y)) 748core-y := $(patsubst %/, %/built-in.o, $(core-y)) 749drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y)) 750net-y := $(patsubst %/, %/built-in.o, $(net-y)) 751libs-y1 := $(patsubst %/, %/lib.a, $(libs-y)) 752libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y)) 753libs-y := $(libs-y1) $(libs-y2) 754 755# Externally visible symbols (used by link-vmlinux.sh) 756export KBUILD_VMLINUX_INIT := $(head-y) $(init-y) 757export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y) 758export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 759export LDFLAGS_vmlinux 760# used by scripts/pacmage/Makefile 761export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools virt) 762 763vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) 764 765# Final link of vmlinux 766 cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) 767quiet_cmd_link-vmlinux = LINK $@ 768 769# Include targets which we want to 770# execute if the rest of the kernel build went well. 771vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE 772ifdef CONFIG_HEADERS_CHECK 773 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check 774endif 775ifdef CONFIG_SAMPLES 776 $(Q)$(MAKE) $(build)=samples 777endif 778ifdef CONFIG_BUILD_DOCSRC 779 $(Q)$(MAKE) $(build)=Documentation 780endif 781 +$(call if_changed,link-vmlinux) 782 783# The actual objects are generated when descending, 784# make sure no implicit rule kicks in 785$(sort $(vmlinux-deps)): $(vmlinux-dirs) ; 786 787# Handle descending into subdirectories listed in $(vmlinux-dirs) 788# Preset locale variables to speed up the build process. Limit locale 789# tweaks to this spot to avoid wrong language settings when running 790# make menuconfig etc. 791# Error messages still appears in the original language 792 793PHONY += $(vmlinux-dirs) 794$(vmlinux-dirs): prepare scripts 795 $(Q)$(MAKE) $(build)=$@ 796 797# Store (new) KERNELRELASE string in include/config/kernel.release 798include/config/kernel.release: include/config/auto.conf FORCE 799 $(Q)rm -f $@ 800 $(Q)echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" > $@ 801 802 803# Things we need to do before we recursively start building the kernel 804# or the modules are listed in "prepare". 805# A multi level approach is used. prepareN is processed before prepareN-1. 806# archprepare is used in arch Makefiles and when processed asm symlink, 807# version.h and scripts_basic is processed / created. 808 809# Listed in dependency order 810PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3 811 812# prepare3 is used to check if we are building in a separate output directory, 813# and if so do: 814# 1) Check that make has not been executed in the kernel src $(srctree) 815prepare3: include/config/kernel.release 816ifneq ($(KBUILD_SRC),) 817 @$(kecho) ' Using $(srctree) as source for kernel' 818 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \ 819 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \ 820 echo >&2 " in the '$(srctree)' directory.";\ 821 /bin/false; \ 822 fi; 823endif 824 825# prepare2 creates a makefile if using a separate output directory 826prepare2: prepare3 outputmakefile asm-generic 827 828prepare1: prepare2 $(version_h) include/generated/utsrelease.h \ 829 include/config/auto.conf 830 $(cmd_crmodverdir) 831 832archprepare: archheaders archscripts prepare1 scripts_basic 833 834prepare0: archprepare FORCE 835 $(Q)$(MAKE) $(build)=. 836 837# All the preparing.. 838prepare: prepare0 839 840# Generate some files 841# --------------------------------------------------------------------------- 842 843# KERNELRELEASE can change from a few different places, meaning version.h 844# needs to be updated, so this check is forced on all builds 845 846uts_len := 64 847define filechk_utsrelease.h 848 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 849 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 850 exit 1; \ 851 fi; \ 852 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";) 853endef 854 855define filechk_version.h 856 (echo \#define LINUX_VERSION_CODE $(shell \ 857 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \ 858 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';) 859endef 860 861$(version_h): $(srctree)/Makefile FORCE 862 $(call filechk,version.h) 863 864include/generated/utsrelease.h: include/config/kernel.release FORCE 865 $(call filechk,utsrelease.h) 866 867PHONY += headerdep 868headerdep: 869 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 870 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 871 872# --------------------------------------------------------------------------- 873 874PHONY += depend dep 875depend dep: 876 @echo '*** Warning: make $@ is unnecessary now.' 877 878# --------------------------------------------------------------------------- 879# Firmware install 880INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware 881export INSTALL_FW_PATH 882 883PHONY += firmware_install 884firmware_install: FORCE 885 @mkdir -p $(objtree)/firmware 886 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install 887 888# --------------------------------------------------------------------------- 889# Kernel headers 890 891#Default location for installed headers 892export INSTALL_HDR_PATH = $(objtree)/usr 893 894hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj 895 896# If we do an all arch process set dst to asm-$(hdr-arch) 897hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm) 898 899PHONY += archheaders 900archheaders: 901 902PHONY += archscripts 903archscripts: 904 905PHONY += __headers 906__headers: $(version_h) scripts_basic asm-generic archheaders archscripts FORCE 907 $(Q)$(MAKE) $(build)=scripts build_unifdef 908 909PHONY += headers_install_all 910headers_install_all: 911 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install 912 913PHONY += headers_install 914headers_install: __headers 915 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \ 916 $(error Headers not exportable for the $(SRCARCH) architecture)) 917 $(Q)$(MAKE) $(hdr-inst)=include/uapi 918 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) 919 920PHONY += headers_check_all 921headers_check_all: headers_install_all 922 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check 923 924PHONY += headers_check 925headers_check: headers_install 926 $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1 927 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1 928 929# --------------------------------------------------------------------------- 930# Modules 931 932ifdef CONFIG_MODULES 933 934# By default, build modules as well 935 936all: modules 937 938# Build modules 939# 940# A module can be listed more than once in obj-m resulting in 941# duplicate lines in modules.order files. Those are removed 942# using awk while concatenating to the final file. 943 944PHONY += modules 945modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin 946 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order 947 @$(kecho) ' Building modules, stage 2.'; 948 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 949 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild 950 951modules.builtin: $(vmlinux-dirs:%=%/modules.builtin) 952 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin 953 954%/modules.builtin: include/config/auto.conf 955 $(Q)$(MAKE) $(modbuiltin)=$* 956 957 958# Target to prepare building external modules 959PHONY += modules_prepare 960modules_prepare: prepare scripts 961 962# Target to install modules 963PHONY += modules_install 964modules_install: _modinst_ _modinst_post 965 966PHONY += _modinst_ 967_modinst_: 968 @rm -rf $(MODLIB)/kernel 969 @rm -f $(MODLIB)/source 970 @mkdir -p $(MODLIB)/kernel 971 @ln -s $(srctree) $(MODLIB)/source 972 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 973 rm -f $(MODLIB)/build ; \ 974 ln -s $(objtree) $(MODLIB)/build ; \ 975 fi 976 @cp -f $(objtree)/modules.order $(MODLIB)/ 977 @cp -f $(objtree)/modules.builtin $(MODLIB)/ 978 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 979 980# This depmod is only for convenience to give the initial 981# boot a modules.dep even before / is mounted read-write. However the 982# boot script depmod is the master version. 983PHONY += _modinst_post 984_modinst_post: _modinst_ 985 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst 986 $(call cmd,depmod) 987 988ifeq ($(CONFIG_MODULE_SIG), y) 989PHONY += modules_sign 990modules_sign: 991 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign 992endif 993 994else # CONFIG_MODULES 995 996# Modules not configured 997# --------------------------------------------------------------------------- 998 999modules modules_install: FORCE 1000 @echo >&2 1001 @echo >&2 "The present kernel configuration has modules disabled." 1002 @echo >&2 "Type 'make config' and enable loadable module support." 1003 @echo >&2 "Then build a kernel with module support enabled." 1004 @echo >&2 1005 @exit 1 1006 1007endif # CONFIG_MODULES 1008 1009### 1010# Cleaning is done on three levels. 1011# make clean Delete most generated files 1012# Leave enough to build external modules 1013# make mrproper Delete the current configuration, and all generated files 1014# make distclean Remove editor backup files, patch leftover files and the like 1015 1016# Directories & files removed with 'make clean' 1017CLEAN_DIRS += $(MODVERDIR) 1018 1019# Directories & files removed with 'make mrproper' 1020MRPROPER_DIRS += include/config usr/include include/generated \ 1021 arch/*/include/generated 1022MRPROPER_FILES += .config .config.old .version .old_version $(version_h) \ 1023 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \ 1024 signing_key.priv signing_key.x509 x509.genkey \ 1025 extra_certificates signing_key.x509.keyid \ 1026 signing_key.x509.signer 1027 1028# clean - Delete most, but leave enough to build external modules 1029# 1030clean: rm-dirs := $(CLEAN_DIRS) 1031clean: rm-files := $(CLEAN_FILES) 1032clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples) 1033 1034PHONY += $(clean-dirs) clean archclean vmlinuxclean 1035$(clean-dirs): 1036 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1037 1038vmlinuxclean: 1039 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1040 1041clean: archclean vmlinuxclean 1042 1043# mrproper - Delete all generated files, including .config 1044# 1045mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS)) 1046mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1047mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts) 1048 1049PHONY += $(mrproper-dirs) mrproper archmrproper 1050$(mrproper-dirs): 1051 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1052 1053mrproper: clean archmrproper $(mrproper-dirs) 1054 $(call cmd,rmdirs) 1055 $(call cmd,rmfiles) 1056 1057# distclean 1058# 1059PHONY += distclean 1060 1061distclean: mrproper 1062 @find $(srctree) $(RCS_FIND_IGNORE) \ 1063 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1064 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \ 1065 -o -name '.*.rej' \ 1066 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \ 1067 -type f -print | xargs rm -f 1068 1069 1070# Packaging of the kernel to various formats 1071# --------------------------------------------------------------------------- 1072# rpm target kept for backward compatibility 1073package-dir := $(srctree)/scripts/package 1074 1075%src-pkg: FORCE 1076 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1077%pkg: include/config/kernel.release FORCE 1078 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1079rpm: include/config/kernel.release FORCE 1080 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1081 1082 1083# Brief documentation of the typical targets used 1084# --------------------------------------------------------------------------- 1085 1086boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1087boards := $(notdir $(boards)) 1088board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1089board-dirs := $(sort $(notdir $(board-dirs:/=))) 1090 1091help: 1092 @echo 'Cleaning targets:' 1093 @echo ' clean - Remove most generated files but keep the config and' 1094 @echo ' enough build support to build external modules' 1095 @echo ' mrproper - Remove all generated files + config + various backup files' 1096 @echo ' distclean - mrproper + remove editor backup and patch files' 1097 @echo '' 1098 @echo 'Configuration targets:' 1099 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1100 @echo '' 1101 @echo 'Other generic targets:' 1102 @echo ' all - Build all targets marked with [*]' 1103 @echo '* vmlinux - Build the bare kernel' 1104 @echo '* modules - Build all modules' 1105 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1106 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH' 1107 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)' 1108 @echo ' dir/ - Build all files in dir and below' 1109 @echo ' dir/file.[oisS] - Build specified target only' 1110 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1111 @echo ' (requires a recent binutils and recent build (System.map))' 1112 @echo ' dir/file.ko - Build module including final link' 1113 @echo ' modules_prepare - Set up for building external modules' 1114 @echo ' tags/TAGS - Generate tags file for editors' 1115 @echo ' cscope - Generate cscope index' 1116 @echo ' gtags - Generate GNU GLOBAL index' 1117 @echo ' kernelrelease - Output the release version string' 1118 @echo ' kernelversion - Output the version stored in Makefile' 1119 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1120 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1121 echo '' 1122 @echo 'Static analysers' 1123 @echo ' checkstack - Generate a list of stack hogs' 1124 @echo ' namespacecheck - Name space analysis on compiled kernel' 1125 @echo ' versioncheck - Sanity check on version.h usage' 1126 @echo ' includecheck - Check for duplicate included header files' 1127 @echo ' export_report - List the usages of all exported symbols' 1128 @echo ' headers_check - Sanity check on exported headers' 1129 @echo ' headerdep - Detect inclusion cycles in headers' 1130 @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help 1131 @echo '' 1132 @echo 'Kernel packaging:' 1133 @$(MAKE) $(build)=$(package-dir) help 1134 @echo '' 1135 @echo 'Documentation targets:' 1136 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp 1137 @echo '' 1138 @echo 'Architecture specific targets ($(SRCARCH)):' 1139 @$(if $(archhelp),$(archhelp),\ 1140 echo ' No architecture specific help defined for $(SRCARCH)') 1141 @echo '' 1142 @$(if $(boards), \ 1143 $(foreach b, $(boards), \ 1144 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1145 echo '') 1146 @$(if $(board-dirs), \ 1147 $(foreach b, $(board-dirs), \ 1148 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1149 printf " %-16s - Show all of the above\\n" help-boards; \ 1150 echo '') 1151 1152 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1153 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1154 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1155 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)' 1156 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1157 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1158 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where' 1159 @echo ' 1: warnings which may be relevant and do not occur too often' 1160 @echo ' 2: warnings which occur quite often but may still be relevant' 1161 @echo ' 3: more obscure warnings, can most likely be ignored' 1162 @echo ' Multiple levels can be combined with W=12 or W=123' 1163 @echo '' 1164 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1165 @echo 'For further info see the ./README file' 1166 1167 1168help-board-dirs := $(addprefix help-,$(board-dirs)) 1169 1170help-boards: $(help-board-dirs) 1171 1172boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)) 1173 1174$(help-board-dirs): help-%: 1175 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1176 @$(if $(boards-per-dir), \ 1177 $(foreach b, $(boards-per-dir), \ 1178 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1179 echo '') 1180 1181 1182# Documentation targets 1183# --------------------------------------------------------------------------- 1184%docs: scripts_basic FORCE 1185 $(Q)$(MAKE) $(build)=scripts build_docproc 1186 $(Q)$(MAKE) $(build)=Documentation/DocBook $@ 1187 1188else # KBUILD_EXTMOD 1189 1190### 1191# External module support. 1192# When building external modules the kernel used as basis is considered 1193# read-only, and no consistency checks are made and the make 1194# system is not used on the basis kernel. If updates are required 1195# in the basis kernel ordinary make commands (without M=...) must 1196# be used. 1197# 1198# The following are the only valid targets when building external 1199# modules. 1200# make M=dir clean Delete all automatically generated files 1201# make M=dir modules Make all modules in specified dir 1202# make M=dir Same as 'make M=dir modules' 1203# make M=dir modules_install 1204# Install the modules built in the module directory 1205# Assumes install directory is already created 1206 1207# We are always building modules 1208KBUILD_MODULES := 1 1209PHONY += crmodverdir 1210crmodverdir: 1211 $(cmd_crmodverdir) 1212 1213PHONY += $(objtree)/Module.symvers 1214$(objtree)/Module.symvers: 1215 @test -e $(objtree)/Module.symvers || ( \ 1216 echo; \ 1217 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \ 1218 echo " is missing; modules will have no dependencies and modversions."; \ 1219 echo ) 1220 1221module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD)) 1222PHONY += $(module-dirs) modules 1223$(module-dirs): crmodverdir $(objtree)/Module.symvers 1224 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@) 1225 1226modules: $(module-dirs) 1227 @$(kecho) ' Building modules, stage 2.'; 1228 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1229 1230PHONY += modules_install 1231modules_install: _emodinst_ _emodinst_post 1232 1233install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra) 1234PHONY += _emodinst_ 1235_emodinst_: 1236 $(Q)mkdir -p $(MODLIB)/$(install-dir) 1237 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1238 1239PHONY += _emodinst_post 1240_emodinst_post: _emodinst_ 1241 $(call cmd,depmod) 1242 1243clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD)) 1244 1245PHONY += $(clean-dirs) clean 1246$(clean-dirs): 1247 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1248 1249clean: rm-dirs := $(MODVERDIR) 1250clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers 1251 1252help: 1253 @echo ' Building external modules.' 1254 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1255 @echo '' 1256 @echo ' modules - default target, build the module(s)' 1257 @echo ' modules_install - install the module' 1258 @echo ' clean - remove generated files in module directory only' 1259 @echo '' 1260 1261# Dummies... 1262PHONY += prepare scripts 1263prepare: ; 1264scripts: ; 1265endif # KBUILD_EXTMOD 1266 1267clean: $(clean-dirs) 1268 $(call cmd,rmdirs) 1269 $(call cmd,rmfiles) 1270 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1271 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \ 1272 -o -name '*.ko.*' \ 1273 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1274 -o -name '*.symtypes' -o -name 'modules.order' \ 1275 -o -name modules.builtin -o -name '.tmp_*.o.*' \ 1276 -o -name '*.gcno' \) -type f -print | xargs rm -f 1277 1278# Generate tags for editors 1279# --------------------------------------------------------------------------- 1280quiet_cmd_tags = GEN $@ 1281 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@ 1282 1283tags TAGS cscope gtags: FORCE 1284 $(call cmd,tags) 1285 1286# Scripts to check various things for consistency 1287# --------------------------------------------------------------------------- 1288 1289PHONY += includecheck versioncheck coccicheck namespacecheck export_report 1290 1291includecheck: 1292 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1293 -name '*.[hcS]' -type f -print | sort \ 1294 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1295 1296versioncheck: 1297 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1298 -name '*.[hcS]' -type f -print | sort \ 1299 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1300 1301coccicheck: 1302 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@ 1303 1304namespacecheck: 1305 $(PERL) $(srctree)/scripts/namespace.pl 1306 1307export_report: 1308 $(PERL) $(srctree)/scripts/export_report.pl 1309 1310endif #ifeq ($(config-targets),1) 1311endif #ifeq ($(mixed-targets),1) 1312 1313PHONY += checkstack kernelrelease kernelversion 1314 1315# UML needs a little special treatment here. It wants to use the host 1316# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1317# else wants $(ARCH), including people doing cross-builds, which means 1318# that $(SUBARCH) doesn't work here. 1319ifeq ($(ARCH), um) 1320CHECKSTACK_ARCH := $(SUBARCH) 1321else 1322CHECKSTACK_ARCH := $(ARCH) 1323endif 1324checkstack: 1325 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1326 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1327 1328kernelrelease: 1329 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1330 1331kernelversion: 1332 @echo $(KERNELVERSION) 1333 1334# Clear a bunch of variables before executing the submake 1335tools/: FORCE 1336 $(Q)mkdir -p $(objtree)/tools 1337 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/ 1338 1339tools/%: FORCE 1340 $(Q)mkdir -p $(objtree)/tools 1341 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/ $* 1342 1343# Single targets 1344# --------------------------------------------------------------------------- 1345# Single targets are compatible with: 1346# - build with mixed source and output 1347# - build with separate output dir 'make O=...' 1348# - external modules 1349# 1350# target-dir => where to store outputfile 1351# build-dir => directory in kernel source tree to use 1352 1353ifeq ($(KBUILD_EXTMOD),) 1354 build-dir = $(patsubst %/,%,$(dir $@)) 1355 target-dir = $(dir $@) 1356else 1357 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@))) 1358 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash)) 1359 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@)) 1360endif 1361 1362%.s: %.c prepare scripts FORCE 1363 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1364%.i: %.c prepare scripts FORCE 1365 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1366%.o: %.c prepare scripts FORCE 1367 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1368%.lst: %.c prepare scripts FORCE 1369 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1370%.s: %.S prepare scripts FORCE 1371 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1372%.o: %.S prepare scripts FORCE 1373 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1374%.symtypes: %.c prepare scripts FORCE 1375 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1376 1377# Modules 1378/: prepare scripts FORCE 1379 $(cmd_crmodverdir) 1380 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1381 $(build)=$(build-dir) 1382%/: prepare scripts FORCE 1383 $(cmd_crmodverdir) 1384 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1385 $(build)=$(build-dir) 1386%.ko: prepare scripts FORCE 1387 $(cmd_crmodverdir) 1388 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1389 $(build)=$(build-dir) $(@:.ko=.o) 1390 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1391 1392# FIXME Should go into a make.lib or something 1393# =========================================================================== 1394 1395quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs))) 1396 cmd_rmdirs = rm -rf $(rm-dirs) 1397 1398quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1399 cmd_rmfiles = rm -f $(rm-files) 1400 1401# Run depmod only if we have System.map and depmod is executable 1402quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) 1403 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1404 $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))" 1405 1406# Create temporary dir for module support files 1407# clean it up only when building all modules 1408cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \ 1409 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*) 1410 1411# read all saved command lines 1412 1413targets := $(wildcard $(sort $(targets))) 1414cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd)) 1415 1416ifneq ($(cmd_files),) 1417 $(cmd_files): ; # Do not try to update included dependency files 1418 include $(cmd_files) 1419endif 1420 1421# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir 1422# Usage: 1423# $(Q)$(MAKE) $(clean)=dir 1424clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj 1425 1426endif # skip-makefile 1427 1428PHONY += FORCE 1429FORCE: 1430 1431# Declare the contents of the .PHONY variable as phony. We keep that 1432# information in a variable so we can use it in if_changed and friends. 1433.PHONY: $(PHONY) 1434