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