1VERSION = 3 2PATCHLEVEL = 4 3SUBLEVEL = 99 4EXTRAVERSION = 5NAME = Saber-toothed Squirrel 6 7# *DOCUMENTATION* 8# To see a list of typical targets execute "make help" 9# More info can be located in ./README 10# Comments in this file are targeted only to the developer, do not 11# expect to learn how to build the kernel reading this file. 12 13# Do not: 14# o use make's built-in rules and variables 15# (this increases performance and avoids hard-to-debug behaviour); 16# o print "Entering directory ..."; 17MAKEFLAGS += -rR --no-print-directory 18 19# Avoid funny character set dependencies 20unexport LC_ALL 21LC_COLLATE=C 22LC_NUMERIC=C 23export LC_COLLATE LC_NUMERIC 24 25# We are using a recursive build, so we need to do a little thinking 26# to get the ordering right. 27# 28# Most importantly: sub-Makefiles should only ever modify files in 29# their own directory. If in some directory we have a dependency on 30# a file in another dir (which doesn't happen often, but it's often 31# unavoidable when linking the built-in.o targets which finally 32# turn into vmlinux), we will call a sub make in that other dir, and 33# after that we are sure that everything which is in that other dir 34# is now up to date. 35# 36# The only cases where we need to modify files which have global 37# effects are thus separated out and done before the recursive 38# descending is started. They are now explicitly listed as the 39# prepare rule. 40 41# To put more focus on warnings, be less verbose as default 42# Use 'make V=1' to see the full commands 43 44ifeq ("$(origin V)", "command line") 45 KBUILD_VERBOSE = $(V) 46endif 47ifndef KBUILD_VERBOSE 48 KBUILD_VERBOSE = 0 49endif 50 51# Call a source code checker (by default, "sparse") as part of the 52# C compilation. 53# 54# Use 'make C=1' to enable checking of only re-compiled files. 55# Use 'make C=2' to enable checking of *all* source files, regardless 56# of whether they are re-compiled or not. 57# 58# See the file "Documentation/sparse.txt" for more details, including 59# where to get the "sparse" utility. 60 61ifeq ("$(origin C)", "command line") 62 KBUILD_CHECKSRC = $(C) 63endif 64ifndef KBUILD_CHECKSRC 65 KBUILD_CHECKSRC = 0 66endif 67 68# Use make M=dir to specify directory of external module to build 69# Old syntax make ... SUBDIRS=$PWD is still supported 70# Setting the environment variable KBUILD_EXTMOD take precedence 71ifdef SUBDIRS 72 KBUILD_EXTMOD ?= $(SUBDIRS) 73endif 74 75ifeq ("$(origin M)", "command line") 76 KBUILD_EXTMOD := $(M) 77endif 78 79# kbuild supports saving output files in a separate directory. 80# To locate output files in a separate directory two syntaxes are supported. 81# In both cases the working directory must be the root of the kernel src. 82# 1) O= 83# Use "make O=dir/to/store/output/files/" 84# 85# 2) Set KBUILD_OUTPUT 86# Set the environment variable KBUILD_OUTPUT to point to the directory 87# where the output files shall be placed. 88# export KBUILD_OUTPUT=dir/to/store/output/files/ 89# make 90# 91# The O= assignment takes precedence over the KBUILD_OUTPUT environment 92# variable. 93 94 95# KBUILD_SRC is set on invocation of make in OBJ directory 96# KBUILD_SRC is not intended to be used by the regular user (for now) 97ifeq ($(KBUILD_SRC),) 98 99# OK, Make called in directory where kernel src resides 100# Do we want to locate output files in a separate directory? 101ifeq ("$(origin O)", "command line") 102 KBUILD_OUTPUT := $(O) 103endif 104 105ifeq ("$(origin W)", "command line") 106 export KBUILD_ENABLE_EXTRA_GCC_CHECKS := $(W) 107endif 108 109# That's our default target when none is given on the command line 110PHONY := _all 111_all: 112 113# Cancel implicit rules on top Makefile 114$(CURDIR)/Makefile Makefile: ; 115 116ifneq ($(KBUILD_OUTPUT),) 117# Invoke a second make in the output directory, passing relevant variables 118# check that the output directory actually exists 119saved-output := $(KBUILD_OUTPUT) 120KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd) 121$(if $(KBUILD_OUTPUT),, \ 122 $(error output directory "$(saved-output)" does not exist)) 123 124PHONY += $(MAKECMDGOALS) sub-make 125 126$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make 127 $(Q)@: 128 129sub-make: FORCE 130 $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \ 131 KBUILD_SRC=$(CURDIR) \ 132 KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \ 133 $(filter-out _all sub-make,$(MAKECMDGOALS)) 134 135# Leave processing to above invocation of make 136skip-makefile := 1 137endif # ifneq ($(KBUILD_OUTPUT),) 138endif # ifeq ($(KBUILD_SRC),) 139 140# We process the rest of the Makefile if this is the final invocation of make 141ifeq ($(skip-makefile),) 142 143# If building an external module we do not care about the all: rule 144# but instead _all depend on modules 145PHONY += all 146ifeq ($(KBUILD_EXTMOD),) 147_all: all 148else 149_all: modules 150endif 151 152srctree := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR)) 153objtree := $(CURDIR) 154src := $(srctree) 155obj := $(objtree) 156 157VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD)) 158 159export srctree objtree VPATH 160 161 162# SUBARCH tells the usermode build what the underlying arch is. That is set 163# first, and if a usermode build is happening, the "ARCH=um" on the command 164# line overrides the setting of ARCH below. If a native build is happening, 165# then ARCH is assigned, getting whatever value it gets normally, and 166# SUBARCH is subsequently ignored. 167 168SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \ 169 -e s/arm.*/arm/ -e s/sa110/arm/ \ 170 -e s/s390x/s390/ -e s/parisc64/parisc/ \ 171 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \ 172 -e s/sh[234].*/sh/ ) 173 174# Cross compiling and selecting different set of gcc/bin-utils 175# --------------------------------------------------------------------------- 176# 177# When performing cross compilation for other architectures ARCH shall be set 178# to the target architecture. (See arch/* for the possibilities). 179# ARCH can be set during invocation of make: 180# make ARCH=ia64 181# Another way is to have ARCH set in the environment. 182# The default ARCH is the host where make is executed. 183 184# CROSS_COMPILE specify the prefix used for all executables used 185# during compilation. Only gcc and related bin-utils executables 186# are prefixed with $(CROSS_COMPILE). 187# CROSS_COMPILE can be set on the command line 188# make CROSS_COMPILE=ia64-linux- 189# Alternatively CROSS_COMPILE can be set in the environment. 190# A third alternative is to store a setting in .config so that plain 191# "make" in the configured kernel build directory always uses that. 192# Default value for CROSS_COMPILE is not to prefix executables 193# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 194export KBUILD_BUILDHOST := $(SUBARCH) 195ARCH ?= $(SUBARCH) 196CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%) 197 198# Architecture as present in compile.h 199UTS_MACHINE := $(ARCH) 200SRCARCH := $(ARCH) 201 202# Additional ARCH settings for x86 203ifeq ($(ARCH),i386) 204 SRCARCH := x86 205endif 206ifeq ($(ARCH),x86_64) 207 SRCARCH := x86 208endif 209 210# Additional ARCH settings for sparc 211ifeq ($(ARCH),sparc32) 212 SRCARCH := sparc 213endif 214ifeq ($(ARCH),sparc64) 215 SRCARCH := sparc 216endif 217 218# Additional ARCH settings for sh 219ifeq ($(ARCH),sh64) 220 SRCARCH := sh 221endif 222 223# Additional ARCH settings for tile 224ifeq ($(ARCH),tilepro) 225 SRCARCH := tile 226endif 227ifeq ($(ARCH),tilegx) 228 SRCARCH := tile 229endif 230 231# Where to locate arch specific headers 232hdr-arch := $(SRCARCH) 233 234ifeq ($(ARCH),m68knommu) 235 hdr-arch := m68k 236endif 237 238KCONFIG_CONFIG ?= .config 239export KCONFIG_CONFIG 240 241# SHELL used by kbuild 242CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \ 243 else if [ -x /bin/bash ]; then echo /bin/bash; \ 244 else echo sh; fi ; fi) 245 246HOSTCC = gcc 247HOSTCXX = g++ 248HOSTCFLAGS = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer 249HOSTCXXFLAGS = -O2 250 251# Decide whether to build built-in, modular, or both. 252# Normally, just do built-in. 253 254KBUILD_MODULES := 255KBUILD_BUILTIN := 1 256 257# If we have only "make modules", don't compile built-in objects. 258# When we're building modules with modversions, we need to consider 259# the built-in objects during the descend as well, in order to 260# make sure the checksums are up to date before we record them. 261 262ifeq ($(MAKECMDGOALS),modules) 263 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1) 264endif 265 266# If we have "make <whatever> modules", compile modules 267# in addition to whatever we do anyway. 268# Just "make" or "make all" shall build modules as well 269 270ifneq ($(filter all _all modules,$(MAKECMDGOALS)),) 271 KBUILD_MODULES := 1 272endif 273 274ifeq ($(MAKECMDGOALS),) 275 KBUILD_MODULES := 1 276endif 277 278export KBUILD_MODULES KBUILD_BUILTIN 279export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD 280 281# Beautify output 282# --------------------------------------------------------------------------- 283# 284# Normally, we echo the whole command before executing it. By making 285# that echo $($(quiet)$(cmd)), we now have the possibility to set 286# $(quiet) to choose other forms of output instead, e.g. 287# 288# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@ 289# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< 290# 291# If $(quiet) is empty, the whole command will be printed. 292# If it is set to "quiet_", only the short version will be printed. 293# If it is set to "silent_", nothing will be printed at all, since 294# the variable $(silent_cmd_cc_o_c) doesn't exist. 295# 296# A simple variant is to prefix commands with $(Q) - that's useful 297# for commands that shall be hidden in non-verbose mode. 298# 299# $(Q)ln $@ :< 300# 301# If KBUILD_VERBOSE equals 0 then the above command will be hidden. 302# If KBUILD_VERBOSE equals 1 then the above command is displayed. 303 304ifeq ($(KBUILD_VERBOSE),1) 305 quiet = 306 Q = 307else 308 quiet=quiet_ 309 Q = @ 310endif 311 312# If the user is running make -s (silent mode), suppress echoing of 313# commands 314 315ifneq ($(filter s% -s%,$(MAKEFLAGS)),) 316 quiet=silent_ 317endif 318 319export quiet Q KBUILD_VERBOSE 320 321 322# Look for make include files relative to root of kernel src 323MAKEFLAGS += --include-dir=$(srctree) 324 325# We need some generic definitions (do not try to remake the file). 326$(srctree)/scripts/Kbuild.include: ; 327include $(srctree)/scripts/Kbuild.include 328 329# Make variables (CC, etc...) 330 331AS = $(CROSS_COMPILE)as 332LD = $(CROSS_COMPILE)ld 333CC = $(CROSS_COMPILE)gcc 334CPP = $(CC) -E 335AR = $(CROSS_COMPILE)ar 336NM = $(CROSS_COMPILE)nm 337STRIP = $(CROSS_COMPILE)strip 338OBJCOPY = $(CROSS_COMPILE)objcopy 339OBJDUMP = $(CROSS_COMPILE)objdump 340AWK = awk 341GENKSYMS = scripts/genksyms/genksyms 342INSTALLKERNEL := installkernel 343DEPMOD = /sbin/depmod 344KALLSYMS = scripts/kallsyms 345PERL = perl 346CHECK = sparse 347 348CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 349 -Wbitwise -Wno-return-void $(CF) 350CFLAGS_MODULE = 351AFLAGS_MODULE = 352LDFLAGS_MODULE = 353CFLAGS_KERNEL = 354AFLAGS_KERNEL = 355CFLAGS_GCOV = -fprofile-arcs -ftest-coverage 356 357 358# Use LINUXINCLUDE when you must reference the include/ directory. 359# Needed to be compatible with the O= option 360LINUXINCLUDE := -I$(srctree)/arch/$(hdr-arch)/include \ 361 -Iarch/$(hdr-arch)/include/generated -Iinclude \ 362 $(if $(KBUILD_SRC), -I$(srctree)/include) \ 363 -include $(srctree)/include/linux/kconfig.h 364 365KBUILD_CPPFLAGS := -D__KERNEL__ 366 367KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \ 368 -fno-strict-aliasing -fno-common \ 369 -Werror-implicit-function-declaration \ 370 -Wno-format-security \ 371 -fno-delete-null-pointer-checks 372KBUILD_AFLAGS_KERNEL := 373KBUILD_CFLAGS_KERNEL := 374KBUILD_AFLAGS := -D__ASSEMBLY__ 375KBUILD_AFLAGS_MODULE := -DMODULE 376KBUILD_CFLAGS_MODULE := -DMODULE 377KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds 378 379# Read KERNELRELEASE from include/config/kernel.release (if it exists) 380KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null) 381KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 382 383export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 384export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC 385export CPP AR NM STRIP OBJCOPY OBJDUMP 386export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE 387export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS 388 389export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS 390export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV 391export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 392export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 393export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 394export KBUILD_ARFLAGS 395 396# When compiling out-of-tree modules, put MODVERDIR in the module 397# tree rather than in the kernel tree. The kernel tree might 398# even be read-only. 399export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions 400 401# Files to ignore in find ... statements 402 403RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS -o -name .pc -o -name .hg -o -name .git \) -prune -o 404export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git 405 406# =========================================================================== 407# Rules shared between *config targets and build targets 408 409# Basic helpers built in scripts/ 410PHONY += scripts_basic 411scripts_basic: 412 $(Q)$(MAKE) $(build)=scripts/basic 413 $(Q)rm -f .tmp_quiet_recordmcount 414 415# To avoid any implicit rule to kick in, define an empty command. 416scripts/basic/%: scripts_basic ; 417 418PHONY += outputmakefile 419# outputmakefile generates a Makefile in the output directory, if using a 420# separate output directory. This allows convenient use of make in the 421# output directory. 422outputmakefile: 423ifneq ($(KBUILD_SRC),) 424 $(Q)ln -fsn $(srctree) source 425 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \ 426 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL) 427endif 428 429# Support for using generic headers in asm-generic 430PHONY += asm-generic 431asm-generic: 432 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \ 433 obj=arch/$(SRCARCH)/include/generated/asm 434 435# To make sure we do not include .config for any of the *config targets 436# catch them early, and hand them over to scripts/kconfig/Makefile 437# It is allowed to specify more targets when calling make, including 438# mixing *config targets and build targets. 439# For example 'make oldconfig all'. 440# Detect when mixed targets is specified, and make a second invocation 441# of make so .config is not included in this case either (for *config). 442 443no-dot-config-targets := clean mrproper distclean \ 444 cscope gtags TAGS tags help %docs check% coccicheck \ 445 include/linux/version.h headers_% archheaders archscripts \ 446 kernelversion %src-pkg 447 448config-targets := 0 449mixed-targets := 0 450dot-config := 1 451 452ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 453 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 454 dot-config := 0 455 endif 456endif 457 458ifeq ($(KBUILD_EXTMOD),) 459 ifneq ($(filter config %config,$(MAKECMDGOALS)),) 460 config-targets := 1 461 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),) 462 mixed-targets := 1 463 endif 464 endif 465endif 466 467ifeq ($(mixed-targets),1) 468# =========================================================================== 469# We're called with mixed targets (*config and build targets). 470# Handle them one by one. 471 472%:: FORCE 473 $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@ 474 475else 476ifeq ($(config-targets),1) 477# =========================================================================== 478# *config targets only - make sure prerequisites are updated, and descend 479# in scripts/kconfig to make the *config target 480 481# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 482# KBUILD_DEFCONFIG may point out an alternative default configuration 483# used for 'make defconfig' 484include $(srctree)/arch/$(SRCARCH)/Makefile 485export KBUILD_DEFCONFIG KBUILD_KCONFIG 486 487config: scripts_basic outputmakefile FORCE 488 $(Q)mkdir -p include/linux include/config 489 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 490 491%config: scripts_basic outputmakefile FORCE 492 $(Q)mkdir -p include/linux include/config 493 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 494 495else 496# =========================================================================== 497# Build targets only - this includes vmlinux, arch specific targets, clean 498# targets and others. In general all targets except *config targets. 499 500ifeq ($(KBUILD_EXTMOD),) 501# Additional helpers built in scripts/ 502# Carefully list dependencies so we do not try to build scripts twice 503# in parallel 504PHONY += scripts 505scripts: scripts_basic include/config/auto.conf include/config/tristate.conf 506 $(Q)$(MAKE) $(build)=$(@) 507 508# Objects we will link into vmlinux / subdirs we need to visit 509init-y := init/ 510drivers-y := drivers/ sound/ firmware/ 511net-y := net/ 512libs-y := lib/ 513core-y := usr/ 514endif # KBUILD_EXTMOD 515 516ifeq ($(dot-config),1) 517# Read in config 518-include include/config/auto.conf 519 520ifeq ($(KBUILD_EXTMOD),) 521# Read in dependencies to all Kconfig* files, make sure to run 522# oldconfig if changes are detected. 523-include include/config/auto.conf.cmd 524 525# To avoid any implicit rule to kick in, define an empty command 526$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ; 527 528# If .config is newer than include/config/auto.conf, someone tinkered 529# with it and forgot to run make oldconfig. 530# if auto.conf.cmd is missing then we are probably in a cleaned tree so 531# we execute the config step to be sure to catch updated Kconfig files 532include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd 533 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig 534else 535# external modules needs include/generated/autoconf.h and include/config/auto.conf 536# but do not care if they are up-to-date. Use auto.conf to trigger the test 537PHONY += include/config/auto.conf 538 539include/config/auto.conf: 540 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 541 echo; \ 542 echo " ERROR: Kernel configuration is invalid."; \ 543 echo " include/generated/autoconf.h or $@ are missing.";\ 544 echo " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 545 echo; \ 546 /bin/false) 547 548endif # KBUILD_EXTMOD 549 550else 551# Dummy target needed, because used as prerequisite 552include/config/auto.conf: ; 553endif # $(dot-config) 554 555# The all: target is the default when no target is given on the 556# command line. 557# This allow a user to issue only 'make' to build a kernel including modules 558# Defaults to vmlinux, but the arch makefile usually adds further targets 559all: vmlinux 560 561ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 562KBUILD_CFLAGS += -Os 563else 564KBUILD_CFLAGS += -O2 565endif 566 567include $(srctree)/arch/$(SRCARCH)/Makefile 568 569ifneq ($(CONFIG_FRAME_WARN),0) 570KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN}) 571endif 572 573# Force gcc to behave correct even for buggy distributions 574ifndef CONFIG_CC_STACKPROTECTOR 575KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector) 576endif 577 578# This warning generated too much noise in a regular build. 579# Use make W=1 to enable this warning (see scripts/Makefile.build) 580KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable) 581 582ifdef CONFIG_FRAME_POINTER 583KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 584else 585# Some targets (ARM with Thumb2, for example), can't be built with frame 586# pointers. For those, we don't have FUNCTION_TRACER automatically 587# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 588# incompatible with -fomit-frame-pointer with current GCC, so we don't use 589# -fomit-frame-pointer with FUNCTION_TRACER. 590ifndef CONFIG_FUNCTION_TRACER 591KBUILD_CFLAGS += -fomit-frame-pointer 592endif 593endif 594 595ifdef CONFIG_DEBUG_INFO 596KBUILD_CFLAGS += -g 597KBUILD_AFLAGS += -gdwarf-2 598endif 599 600ifdef CONFIG_DEBUG_INFO_REDUCED 601KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) 602endif 603 604ifdef CONFIG_FUNCTION_TRACER 605KBUILD_CFLAGS += -pg 606ifdef CONFIG_DYNAMIC_FTRACE 607 ifdef CONFIG_HAVE_C_RECORDMCOUNT 608 BUILD_C_RECORDMCOUNT := y 609 export BUILD_C_RECORDMCOUNT 610 endif 611endif 612endif 613 614# We trigger additional mismatches with less inlining 615ifdef CONFIG_DEBUG_SECTION_MISMATCH 616KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) 617endif 618 619# arch Makefile may override CC so keep this after arch Makefile is included 620NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) 621CHECKFLAGS += $(NOSTDINC_FLAGS) 622 623# warn about C99 declaration after statement 624KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,) 625 626# disable pointer signed / unsigned warnings in gcc 4.0 627KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign) 628 629# disable invalid "can't wrap" optimizations for signed / pointers 630KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow) 631 632# conserve stack if available 633KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) 634 635# use the deterministic mode of AR if available 636KBUILD_ARFLAGS := $(call ar-option,D) 637 638# check for 'asm goto' 639ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y) 640 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO 641endif 642 643# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments 644# But warn user when we do so 645warn-assign = \ 646$(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)") 647 648ifneq ($(KCPPFLAGS),) 649 $(call warn-assign,CPPFLAGS) 650 KBUILD_CPPFLAGS += $(KCPPFLAGS) 651endif 652ifneq ($(KAFLAGS),) 653 $(call warn-assign,AFLAGS) 654 KBUILD_AFLAGS += $(KAFLAGS) 655endif 656ifneq ($(KCFLAGS),) 657 $(call warn-assign,CFLAGS) 658 KBUILD_CFLAGS += $(KCFLAGS) 659endif 660 661# Use --build-id when available. 662LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\ 663 $(call cc-ldoption, -Wl$(comma)--build-id,)) 664KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID) 665LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID) 666 667ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 668LDFLAGS_vmlinux += $(call ld-option, -X,) 669endif 670 671# Default kernel image to build when no specific target is given. 672# KBUILD_IMAGE may be overruled on the command line or 673# set in the environment 674# Also any assignments in arch/$(ARCH)/Makefile take precedence over 675# this default value 676export KBUILD_IMAGE ?= vmlinux 677 678# 679# INSTALL_PATH specifies where to place the updated kernel and system map 680# images. Default is /boot, but you can set it to other values 681export INSTALL_PATH ?= /boot 682 683# 684# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 685# relocations required by build roots. This is not defined in the 686# makefile but the argument can be passed to make if needed. 687# 688 689MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 690export MODLIB 691 692# 693# INSTALL_MOD_STRIP, if defined, will cause modules to be 694# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then 695# the default option --strip-debug will be used. Otherwise, 696# INSTALL_MOD_STRIP value will be used as the options to the strip command. 697 698ifdef INSTALL_MOD_STRIP 699ifeq ($(INSTALL_MOD_STRIP),1) 700mod_strip_cmd = $(STRIP) --strip-debug 701else 702mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP) 703endif # INSTALL_MOD_STRIP=1 704else 705mod_strip_cmd = true 706endif # INSTALL_MOD_STRIP 707export mod_strip_cmd 708 709 710ifeq ($(KBUILD_EXTMOD),) 711core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/ 712 713vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \ 714 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 715 $(net-y) $(net-m) $(libs-y) $(libs-m))) 716 717vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \ 718 $(init-n) $(init-) \ 719 $(core-n) $(core-) $(drivers-n) $(drivers-) \ 720 $(net-n) $(net-) $(libs-n) $(libs-)))) 721 722init-y := $(patsubst %/, %/built-in.o, $(init-y)) 723core-y := $(patsubst %/, %/built-in.o, $(core-y)) 724drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y)) 725net-y := $(patsubst %/, %/built-in.o, $(net-y)) 726libs-y1 := $(patsubst %/, %/lib.a, $(libs-y)) 727libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y)) 728libs-y := $(libs-y1) $(libs-y2) 729 730# Build vmlinux 731# --------------------------------------------------------------------------- 732# vmlinux is built from the objects selected by $(vmlinux-init) and 733# $(vmlinux-main). Most are built-in.o files from top-level directories 734# in the kernel tree, others are specified in arch/$(ARCH)/Makefile. 735# Ordering when linking is important, and $(vmlinux-init) must be first. 736# 737# vmlinux 738# ^ 739# | 740# +-< $(vmlinux-init) 741# | +--< init/version.o + more 742# | 743# +--< $(vmlinux-main) 744# | +--< driver/built-in.o mm/built-in.o + more 745# | 746# +-< kallsyms.o (see description in CONFIG_KALLSYMS section) 747# 748# vmlinux version (uname -v) cannot be updated during normal 749# descending-into-subdirs phase since we do not yet know if we need to 750# update vmlinux. 751# Therefore this step is delayed until just before final link of vmlinux - 752# except in the kallsyms case where it is done just before adding the 753# symbols to the kernel. 754# 755# System.map is generated to document addresses of all kernel symbols 756 757vmlinux-init := $(head-y) $(init-y) 758vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y) 759vmlinux-all := $(vmlinux-init) $(vmlinux-main) 760vmlinux-lds := arch/$(SRCARCH)/kernel/vmlinux.lds 761export KBUILD_VMLINUX_OBJS := $(vmlinux-all) 762 763# Rule to link vmlinux - also used during CONFIG_KALLSYMS 764# May be overridden by arch/$(ARCH)/Makefile 765quiet_cmd_vmlinux__ ?= LD $@ 766 cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \ 767 -T $(vmlinux-lds) $(vmlinux-init) \ 768 --start-group $(vmlinux-main) --end-group \ 769 $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^) 770 771# Generate new vmlinux version 772quiet_cmd_vmlinux_version = GEN .version 773 cmd_vmlinux_version = set -e; \ 774 if [ ! -r .version ]; then \ 775 rm -f .version; \ 776 echo 1 >.version; \ 777 else \ 778 mv .version .old_version; \ 779 expr 0$$(cat .old_version) + 1 >.version; \ 780 fi; \ 781 $(MAKE) $(build)=init 782 783# Generate System.map 784quiet_cmd_sysmap = SYSMAP 785 cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap 786 787# Link of vmlinux 788# If CONFIG_KALLSYMS is set .version is already updated 789# Generate System.map and verify that the content is consistent 790# Use + in front of the vmlinux_version rule to silent warning with make -j2 791# First command is ':' to allow us to use + in front of the rule 792define rule_vmlinux__ 793 : 794 $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version)) 795 796 $(call cmd,vmlinux__) 797 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd 798 799 $(Q)$(if $($(quiet)cmd_sysmap), \ 800 echo ' $($(quiet)cmd_sysmap) System.map' &&) \ 801 $(cmd_sysmap) $@ System.map; \ 802 if [ $$? -ne 0 ]; then \ 803 rm -f $@; \ 804 /bin/false; \ 805 fi; 806 $(verify_kallsyms) 807endef 808 809 810ifdef CONFIG_KALLSYMS 811# Generate section listing all symbols and add it into vmlinux $(kallsyms.o) 812# It's a three stage process: 813# o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is 814# empty 815# Running kallsyms on that gives us .tmp_kallsyms1.o with 816# the right size - vmlinux version (uname -v) is updated during this step 817# o .tmp_vmlinux2 now has a __kallsyms section of the right size, 818# but due to the added section, some addresses have shifted. 819# From here, we generate a correct .tmp_kallsyms2.o 820# o The correct .tmp_kallsyms2.o is linked into the final vmlinux. 821# o Verify that the System.map from vmlinux matches the map from 822# .tmp_vmlinux2, just in case we did not generate kallsyms correctly. 823# o If 'make KALLSYMS_EXTRA_PASS=1" was used, do an extra pass using 824# .tmp_vmlinux3 and .tmp_kallsyms3.o. This is only meant as a 825# temporary bypass to allow the kernel to be built while the 826# maintainers work out what went wrong with kallsyms. 827 828last_kallsyms := 2 829 830ifdef KALLSYMS_EXTRA_PASS 831ifneq ($(KALLSYMS_EXTRA_PASS),0) 832last_kallsyms := 3 833endif 834endif 835 836kallsyms.o := .tmp_kallsyms$(last_kallsyms).o 837 838define verify_kallsyms 839 $(Q)$(if $($(quiet)cmd_sysmap), \ 840 echo ' $($(quiet)cmd_sysmap) .tmp_System.map' &&) \ 841 $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map 842 $(Q)cmp -s System.map .tmp_System.map || \ 843 (echo Inconsistent kallsyms data; \ 844 echo This is a bug - please report about it; \ 845 echo Try "make KALLSYMS_EXTRA_PASS=1" as a workaround; \ 846 rm .tmp_kallsyms* ; /bin/false ) 847endef 848 849# Update vmlinux version before link 850# Use + in front of this rule to silent warning about make -j1 851# First command is ':' to allow us to use + in front of this rule 852cmd_ksym_ld = $(cmd_vmlinux__) 853define rule_ksym_ld 854 : 855 +$(call cmd,vmlinux_version) 856 $(call cmd,vmlinux__) 857 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd 858endef 859 860# Generate .S file with all kernel symbols 861quiet_cmd_kallsyms = KSYM $@ 862 cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \ 863 $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@ 864 865.tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE 866 $(call if_changed_dep,as_o_S) 867 868.tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS) 869 $(call cmd,kallsyms) 870 871# .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version 872.tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE 873 $(call if_changed_rule,ksym_ld) 874 875.tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE 876 $(call if_changed,vmlinux__) 877 878.tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE 879 $(call if_changed,vmlinux__) 880 881# Needs to visit scripts/ before $(KALLSYMS) can be used. 882$(KALLSYMS): scripts ; 883 884# Generate some data for debugging strange kallsyms problems 885debug_kallsyms: .tmp_map$(last_kallsyms) 886 887.tmp_map%: .tmp_vmlinux% FORCE 888 ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@ 889 890.tmp_map3: .tmp_map2 891 892.tmp_map2: .tmp_map1 893 894endif # ifdef CONFIG_KALLSYMS 895 896# Do modpost on a prelinked vmlinux. The finally linked vmlinux has 897# relevant sections renamed as per the linker script. 898quiet_cmd_vmlinux-modpost = LD $@ 899 cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@ \ 900 $(vmlinux-init) --start-group $(vmlinux-main) --end-group \ 901 $(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^) 902define rule_vmlinux-modpost 903 : 904 +$(call cmd,vmlinux-modpost) 905 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@ 906 $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd 907endef 908 909# vmlinux image - including updated kernel symbols 910vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) FORCE 911ifdef CONFIG_HEADERS_CHECK 912 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check 913endif 914ifdef CONFIG_SAMPLES 915 $(Q)$(MAKE) $(build)=samples 916endif 917ifdef CONFIG_BUILD_DOCSRC 918 $(Q)$(MAKE) $(build)=Documentation 919endif 920 $(call vmlinux-modpost) 921 $(call if_changed_rule,vmlinux__) 922 $(Q)rm -f .old_version 923 924# build vmlinux.o first to catch section mismatch errors early 925ifdef CONFIG_KALLSYMS 926.tmp_vmlinux1: vmlinux.o 927endif 928 929modpost-init := $(filter-out init/built-in.o, $(vmlinux-init)) 930vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE 931 $(call if_changed_rule,vmlinux-modpost) 932 933# The actual objects are generated when descending, 934# make sure no implicit rule kicks in 935$(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ; 936 937# Handle descending into subdirectories listed in $(vmlinux-dirs) 938# Preset locale variables to speed up the build process. Limit locale 939# tweaks to this spot to avoid wrong language settings when running 940# make menuconfig etc. 941# Error messages still appears in the original language 942 943PHONY += $(vmlinux-dirs) 944$(vmlinux-dirs): prepare scripts 945 $(Q)$(MAKE) $(build)=$@ 946 947# Store (new) KERNELRELASE string in include/config/kernel.release 948include/config/kernel.release: include/config/auto.conf FORCE 949 $(Q)rm -f $@ 950 $(Q)echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" > $@ 951 952 953# Things we need to do before we recursively start building the kernel 954# or the modules are listed in "prepare". 955# A multi level approach is used. prepareN is processed before prepareN-1. 956# archprepare is used in arch Makefiles and when processed asm symlink, 957# version.h and scripts_basic is processed / created. 958 959# Listed in dependency order 960PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3 961 962# prepare3 is used to check if we are building in a separate output directory, 963# and if so do: 964# 1) Check that make has not been executed in the kernel src $(srctree) 965prepare3: include/config/kernel.release 966ifneq ($(KBUILD_SRC),) 967 @$(kecho) ' Using $(srctree) as source for kernel' 968 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \ 969 echo " $(srctree) is not clean, please run 'make mrproper'";\ 970 echo " in the '$(srctree)' directory.";\ 971 /bin/false; \ 972 fi; 973endif 974 975# prepare2 creates a makefile if using a separate output directory 976prepare2: prepare3 outputmakefile asm-generic 977 978prepare1: prepare2 include/linux/version.h include/generated/utsrelease.h \ 979 include/config/auto.conf 980 $(cmd_crmodverdir) 981 982archprepare: archheaders archscripts prepare1 scripts_basic 983 984prepare0: archprepare FORCE 985 $(Q)$(MAKE) $(build)=. 986 987# All the preparing.. 988prepare: prepare0 989 990# Generate some files 991# --------------------------------------------------------------------------- 992 993# KERNELRELEASE can change from a few different places, meaning version.h 994# needs to be updated, so this check is forced on all builds 995 996uts_len := 64 997define filechk_utsrelease.h 998 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 999 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1000 exit 1; \ 1001 fi; \ 1002 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";) 1003endef 1004 1005define filechk_version.h 1006 (echo \#define LINUX_VERSION_CODE $(shell \ 1007 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \ 1008 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';) 1009endef 1010 1011include/linux/version.h: $(srctree)/Makefile FORCE 1012 $(call filechk,version.h) 1013 1014include/generated/utsrelease.h: include/config/kernel.release FORCE 1015 $(call filechk,utsrelease.h) 1016 1017PHONY += headerdep 1018headerdep: 1019 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1020 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1021 1022# --------------------------------------------------------------------------- 1023 1024PHONY += depend dep 1025depend dep: 1026 @echo '*** Warning: make $@ is unnecessary now.' 1027 1028# --------------------------------------------------------------------------- 1029# Firmware install 1030INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware 1031export INSTALL_FW_PATH 1032 1033PHONY += firmware_install 1034firmware_install: FORCE 1035 @mkdir -p $(objtree)/firmware 1036 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install 1037 1038# --------------------------------------------------------------------------- 1039# Kernel headers 1040 1041#Default location for installed headers 1042export INSTALL_HDR_PATH = $(objtree)/usr 1043 1044hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj 1045 1046# If we do an all arch process set dst to asm-$(hdr-arch) 1047hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm) 1048 1049PHONY += archheaders 1050archheaders: 1051 1052PHONY += archscripts 1053archscripts: 1054 1055PHONY += __headers 1056__headers: include/linux/version.h scripts_basic asm-generic archheaders archscripts FORCE 1057 $(Q)$(MAKE) $(build)=scripts build_unifdef 1058 1059PHONY += headers_install_all 1060headers_install_all: 1061 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install 1062 1063PHONY += headers_install 1064headers_install: __headers 1065 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/asm/Kbuild),, \ 1066 $(error Headers not exportable for the $(SRCARCH) architecture)) 1067 $(Q)$(MAKE) $(hdr-inst)=include 1068 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst) 1069 1070PHONY += headers_check_all 1071headers_check_all: headers_install_all 1072 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check 1073 1074PHONY += headers_check 1075headers_check: headers_install 1076 $(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1 1077 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst) HDRCHECK=1 1078 1079# --------------------------------------------------------------------------- 1080# Modules 1081 1082ifdef CONFIG_MODULES 1083 1084# By default, build modules as well 1085 1086all: modules 1087 1088# Build modules 1089# 1090# A module can be listed more than once in obj-m resulting in 1091# duplicate lines in modules.order files. Those are removed 1092# using awk while concatenating to the final file. 1093 1094PHONY += modules 1095modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin 1096 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order 1097 @$(kecho) ' Building modules, stage 2.'; 1098 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1099 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild 1100 1101modules.builtin: $(vmlinux-dirs:%=%/modules.builtin) 1102 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin 1103 1104%/modules.builtin: include/config/auto.conf 1105 $(Q)$(MAKE) $(modbuiltin)=$* 1106 1107 1108# Target to prepare building external modules 1109PHONY += modules_prepare 1110modules_prepare: prepare scripts 1111 1112# Target to install modules 1113PHONY += modules_install 1114modules_install: _modinst_ _modinst_post 1115 1116PHONY += _modinst_ 1117_modinst_: 1118 @rm -rf $(MODLIB)/kernel 1119 @rm -f $(MODLIB)/source 1120 @mkdir -p $(MODLIB)/kernel 1121 @ln -s $(srctree) $(MODLIB)/source 1122 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1123 rm -f $(MODLIB)/build ; \ 1124 ln -s $(objtree) $(MODLIB)/build ; \ 1125 fi 1126 @cp -f $(objtree)/modules.order $(MODLIB)/ 1127 @cp -f $(objtree)/modules.builtin $(MODLIB)/ 1128 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1129 1130# This depmod is only for convenience to give the initial 1131# boot a modules.dep even before / is mounted read-write. However the 1132# boot script depmod is the master version. 1133PHONY += _modinst_post 1134_modinst_post: _modinst_ 1135 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst 1136 $(call cmd,depmod) 1137 1138else # CONFIG_MODULES 1139 1140# Modules not configured 1141# --------------------------------------------------------------------------- 1142 1143modules modules_install: FORCE 1144 @echo 1145 @echo "The present kernel configuration has modules disabled." 1146 @echo "Type 'make config' and enable loadable module support." 1147 @echo "Then build a kernel with module support enabled." 1148 @echo 1149 @exit 1 1150 1151endif # CONFIG_MODULES 1152 1153### 1154# Cleaning is done on three levels. 1155# make clean Delete most generated files 1156# Leave enough to build external modules 1157# make mrproper Delete the current configuration, and all generated files 1158# make distclean Remove editor backup files, patch leftover files and the like 1159 1160# Directories & files removed with 'make clean' 1161CLEAN_DIRS += $(MODVERDIR) 1162CLEAN_FILES += vmlinux System.map \ 1163 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map 1164 1165# Directories & files removed with 'make mrproper' 1166MRPROPER_DIRS += include/config usr/include include/generated \ 1167 arch/*/include/generated 1168MRPROPER_FILES += .config .config.old .version .old_version \ 1169 include/linux/version.h \ 1170 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS 1171 1172# clean - Delete most, but leave enough to build external modules 1173# 1174clean: rm-dirs := $(CLEAN_DIRS) 1175clean: rm-files := $(CLEAN_FILES) 1176clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples) 1177 1178PHONY += $(clean-dirs) clean archclean 1179$(clean-dirs): 1180 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1181 1182clean: archclean 1183 1184# mrproper - Delete all generated files, including .config 1185# 1186mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS)) 1187mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1188mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts) 1189 1190PHONY += $(mrproper-dirs) mrproper archmrproper 1191$(mrproper-dirs): 1192 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1193 1194mrproper: clean archmrproper $(mrproper-dirs) 1195 $(call cmd,rmdirs) 1196 $(call cmd,rmfiles) 1197 1198# distclean 1199# 1200PHONY += distclean 1201 1202distclean: mrproper 1203 @find $(srctree) $(RCS_FIND_IGNORE) \ 1204 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1205 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \ 1206 -o -name '.*.rej' \ 1207 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \ 1208 -type f -print | xargs rm -f 1209 1210 1211# Packaging of the kernel to various formats 1212# --------------------------------------------------------------------------- 1213# rpm target kept for backward compatibility 1214package-dir := $(srctree)/scripts/package 1215 1216%src-pkg: FORCE 1217 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1218%pkg: include/config/kernel.release FORCE 1219 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1220rpm: include/config/kernel.release FORCE 1221 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1222 1223 1224# Brief documentation of the typical targets used 1225# --------------------------------------------------------------------------- 1226 1227boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1228boards := $(notdir $(boards)) 1229board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1230board-dirs := $(sort $(notdir $(board-dirs:/=))) 1231 1232help: 1233 @echo 'Cleaning targets:' 1234 @echo ' clean - Remove most generated files but keep the config and' 1235 @echo ' enough build support to build external modules' 1236 @echo ' mrproper - Remove all generated files + config + various backup files' 1237 @echo ' distclean - mrproper + remove editor backup and patch files' 1238 @echo '' 1239 @echo 'Configuration targets:' 1240 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1241 @echo '' 1242 @echo 'Other generic targets:' 1243 @echo ' all - Build all targets marked with [*]' 1244 @echo '* vmlinux - Build the bare kernel' 1245 @echo '* modules - Build all modules' 1246 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1247 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH' 1248 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)' 1249 @echo ' dir/ - Build all files in dir and below' 1250 @echo ' dir/file.[oisS] - Build specified target only' 1251 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1252 @echo ' (requires a recent binutils and recent build (System.map))' 1253 @echo ' dir/file.ko - Build module including final link' 1254 @echo ' modules_prepare - Set up for building external modules' 1255 @echo ' tags/TAGS - Generate tags file for editors' 1256 @echo ' cscope - Generate cscope index' 1257 @echo ' gtags - Generate GNU GLOBAL index' 1258 @echo ' kernelrelease - Output the release version string' 1259 @echo ' kernelversion - Output the version stored in Makefile' 1260 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1261 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1262 echo '' 1263 @echo 'Static analysers' 1264 @echo ' checkstack - Generate a list of stack hogs' 1265 @echo ' namespacecheck - Name space analysis on compiled kernel' 1266 @echo ' versioncheck - Sanity check on version.h usage' 1267 @echo ' includecheck - Check for duplicate included header files' 1268 @echo ' export_report - List the usages of all exported symbols' 1269 @echo ' headers_check - Sanity check on exported headers' 1270 @echo ' headerdep - Detect inclusion cycles in headers' 1271 @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help 1272 @echo '' 1273 @echo 'Kernel packaging:' 1274 @$(MAKE) $(build)=$(package-dir) help 1275 @echo '' 1276 @echo 'Documentation targets:' 1277 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp 1278 @echo '' 1279 @echo 'Architecture specific targets ($(SRCARCH)):' 1280 @$(if $(archhelp),$(archhelp),\ 1281 echo ' No architecture specific help defined for $(SRCARCH)') 1282 @echo '' 1283 @$(if $(boards), \ 1284 $(foreach b, $(boards), \ 1285 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1286 echo '') 1287 @$(if $(board-dirs), \ 1288 $(foreach b, $(board-dirs), \ 1289 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1290 printf " %-16s - Show all of the above\\n" help-boards; \ 1291 echo '') 1292 1293 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1294 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1295 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1296 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)' 1297 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1298 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1299 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where' 1300 @echo ' 1: warnings which may be relevant and do not occur too often' 1301 @echo ' 2: warnings which occur quite often but may still be relevant' 1302 @echo ' 3: more obscure warnings, can most likely be ignored' 1303 @echo ' Multiple levels can be combined with W=12 or W=123' 1304 @echo '' 1305 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1306 @echo 'For further info see the ./README file' 1307 1308 1309help-board-dirs := $(addprefix help-,$(board-dirs)) 1310 1311help-boards: $(help-board-dirs) 1312 1313boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)) 1314 1315$(help-board-dirs): help-%: 1316 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1317 @$(if $(boards-per-dir), \ 1318 $(foreach b, $(boards-per-dir), \ 1319 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1320 echo '') 1321 1322 1323# Documentation targets 1324# --------------------------------------------------------------------------- 1325%docs: scripts_basic FORCE 1326 $(Q)$(MAKE) $(build)=scripts build_docproc 1327 $(Q)$(MAKE) $(build)=Documentation/DocBook $@ 1328 1329else # KBUILD_EXTMOD 1330 1331### 1332# External module support. 1333# When building external modules the kernel used as basis is considered 1334# read-only, and no consistency checks are made and the make 1335# system is not used on the basis kernel. If updates are required 1336# in the basis kernel ordinary make commands (without M=...) must 1337# be used. 1338# 1339# The following are the only valid targets when building external 1340# modules. 1341# make M=dir clean Delete all automatically generated files 1342# make M=dir modules Make all modules in specified dir 1343# make M=dir Same as 'make M=dir modules' 1344# make M=dir modules_install 1345# Install the modules built in the module directory 1346# Assumes install directory is already created 1347 1348# We are always building modules 1349KBUILD_MODULES := 1 1350PHONY += crmodverdir 1351crmodverdir: 1352 $(cmd_crmodverdir) 1353 1354PHONY += $(objtree)/Module.symvers 1355$(objtree)/Module.symvers: 1356 @test -e $(objtree)/Module.symvers || ( \ 1357 echo; \ 1358 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \ 1359 echo " is missing; modules will have no dependencies and modversions."; \ 1360 echo ) 1361 1362module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD)) 1363PHONY += $(module-dirs) modules 1364$(module-dirs): crmodverdir $(objtree)/Module.symvers 1365 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@) 1366 1367modules: $(module-dirs) 1368 @$(kecho) ' Building modules, stage 2.'; 1369 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1370 1371PHONY += modules_install 1372modules_install: _emodinst_ _emodinst_post 1373 1374install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra) 1375PHONY += _emodinst_ 1376_emodinst_: 1377 $(Q)mkdir -p $(MODLIB)/$(install-dir) 1378 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1379 1380PHONY += _emodinst_post 1381_emodinst_post: _emodinst_ 1382 $(call cmd,depmod) 1383 1384clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD)) 1385 1386PHONY += $(clean-dirs) clean 1387$(clean-dirs): 1388 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1389 1390clean: rm-dirs := $(MODVERDIR) 1391clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers 1392 1393help: 1394 @echo ' Building external modules.' 1395 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1396 @echo '' 1397 @echo ' modules - default target, build the module(s)' 1398 @echo ' modules_install - install the module' 1399 @echo ' clean - remove generated files in module directory only' 1400 @echo '' 1401 1402# Dummies... 1403PHONY += prepare scripts 1404prepare: ; 1405scripts: ; 1406endif # KBUILD_EXTMOD 1407 1408clean: $(clean-dirs) 1409 $(call cmd,rmdirs) 1410 $(call cmd,rmfiles) 1411 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1412 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \ 1413 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1414 -o -name '*.symtypes' -o -name 'modules.order' \ 1415 -o -name modules.builtin -o -name '.tmp_*.o.*' \ 1416 -o -name '*.gcno' \) -type f -print | xargs rm -f 1417 1418# Generate tags for editors 1419# --------------------------------------------------------------------------- 1420quiet_cmd_tags = GEN $@ 1421 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@ 1422 1423tags TAGS cscope gtags: FORCE 1424 $(call cmd,tags) 1425 1426# Scripts to check various things for consistency 1427# --------------------------------------------------------------------------- 1428 1429PHONY += includecheck versioncheck coccicheck namespacecheck export_report 1430 1431includecheck: 1432 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1433 -name '*.[hcS]' -type f -print | sort \ 1434 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1435 1436versioncheck: 1437 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1438 -name '*.[hcS]' -type f -print | sort \ 1439 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1440 1441coccicheck: 1442 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@ 1443 1444namespacecheck: 1445 $(PERL) $(srctree)/scripts/namespace.pl 1446 1447export_report: 1448 $(PERL) $(srctree)/scripts/export_report.pl 1449 1450endif #ifeq ($(config-targets),1) 1451endif #ifeq ($(mixed-targets),1) 1452 1453PHONY += checkstack kernelrelease kernelversion 1454 1455# UML needs a little special treatment here. It wants to use the host 1456# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1457# else wants $(ARCH), including people doing cross-builds, which means 1458# that $(SUBARCH) doesn't work here. 1459ifeq ($(ARCH), um) 1460CHECKSTACK_ARCH := $(SUBARCH) 1461else 1462CHECKSTACK_ARCH := $(ARCH) 1463endif 1464checkstack: 1465 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1466 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1467 1468kernelrelease: 1469 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1470 1471kernelversion: 1472 @echo $(KERNELVERSION) 1473 1474# Single targets 1475# --------------------------------------------------------------------------- 1476# Single targets are compatible with: 1477# - build with mixed source and output 1478# - build with separate output dir 'make O=...' 1479# - external modules 1480# 1481# target-dir => where to store outputfile 1482# build-dir => directory in kernel source tree to use 1483 1484ifeq ($(KBUILD_EXTMOD),) 1485 build-dir = $(patsubst %/,%,$(dir $@)) 1486 target-dir = $(dir $@) 1487else 1488 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@))) 1489 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash)) 1490 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@)) 1491endif 1492 1493%.s: %.c prepare scripts FORCE 1494 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1495%.i: %.c prepare scripts FORCE 1496 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1497%.o: %.c prepare scripts FORCE 1498 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1499%.lst: %.c prepare scripts FORCE 1500 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1501%.s: %.S prepare scripts FORCE 1502 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1503%.o: %.S prepare scripts FORCE 1504 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1505%.symtypes: %.c prepare scripts FORCE 1506 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1507 1508# Modules 1509/: prepare scripts FORCE 1510 $(cmd_crmodverdir) 1511 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1512 $(build)=$(build-dir) 1513%/: prepare scripts FORCE 1514 $(cmd_crmodverdir) 1515 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1516 $(build)=$(build-dir) 1517%.ko: prepare scripts FORCE 1518 $(cmd_crmodverdir) 1519 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1520 $(build)=$(build-dir) $(@:.ko=.o) 1521 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1522 1523# FIXME Should go into a make.lib or something 1524# =========================================================================== 1525 1526quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs))) 1527 cmd_rmdirs = rm -rf $(rm-dirs) 1528 1529quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1530 cmd_rmfiles = rm -f $(rm-files) 1531 1532# Run depmod only if we have System.map and depmod is executable 1533quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) 1534 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1535 $(KERNELRELEASE) 1536 1537# Create temporary dir for module support files 1538# clean it up only when building all modules 1539cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \ 1540 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*) 1541 1542a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \ 1543 $(KBUILD_AFLAGS_KERNEL) \ 1544 $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(KBUILD_CPPFLAGS) \ 1545 $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o) 1546 1547quiet_cmd_as_o_S = AS $@ 1548cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $< 1549 1550# read all saved command lines 1551 1552targets := $(wildcard $(sort $(targets))) 1553cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd)) 1554 1555ifneq ($(cmd_files),) 1556 $(cmd_files): ; # Do not try to update included dependency files 1557 include $(cmd_files) 1558endif 1559 1560# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir 1561# Usage: 1562# $(Q)$(MAKE) $(clean)=dir 1563clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj 1564 1565endif # skip-makefile 1566 1567PHONY += FORCE 1568FORCE: 1569 1570# Declare the contents of the .PHONY variable as phony. We keep that 1571# information in a variable so we can use it in if_changed and friends. 1572.PHONY: $(PHONY) 1573