1VERSION = 3 2PATCHLEVEL = 4 3SUBLEVEL = 0 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 := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS \ 404 -o -name .pc -o -name .hg -o -name .git \) -prune -o 405export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 406 --exclude CVS --exclude .pc --exclude .hg --exclude .git 407 408# =========================================================================== 409# Rules shared between *config targets and build targets 410 411# Basic helpers built in scripts/ 412PHONY += scripts_basic 413scripts_basic: 414 $(Q)$(MAKE) $(build)=scripts/basic 415 $(Q)rm -f .tmp_quiet_recordmcount 416 417# To avoid any implicit rule to kick in, define an empty command. 418scripts/basic/%: scripts_basic ; 419 420PHONY += outputmakefile 421# outputmakefile generates a Makefile in the output directory, if using a 422# separate output directory. This allows convenient use of make in the 423# output directory. 424outputmakefile: 425ifneq ($(KBUILD_SRC),) 426 $(Q)ln -fsn $(srctree) source 427 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \ 428 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL) 429endif 430 431# Support for using generic headers in asm-generic 432PHONY += asm-generic 433asm-generic: 434 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \ 435 obj=arch/$(SRCARCH)/include/generated/asm 436 437# To make sure we do not include .config for any of the *config targets 438# catch them early, and hand them over to scripts/kconfig/Makefile 439# It is allowed to specify more targets when calling make, including 440# mixing *config targets and build targets. 441# For example 'make oldconfig all'. 442# Detect when mixed targets is specified, and make a second invocation 443# of make so .config is not included in this case either (for *config). 444 445no-dot-config-targets := clean mrproper distclean \ 446 cscope gtags TAGS tags help %docs check% coccicheck \ 447 include/linux/version.h headers_% archheaders archscripts \ 448 kernelversion %src-pkg 449 450config-targets := 0 451mixed-targets := 0 452dot-config := 1 453 454ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 455 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 456 dot-config := 0 457 endif 458endif 459 460ifeq ($(KBUILD_EXTMOD),) 461 ifneq ($(filter config %config,$(MAKECMDGOALS)),) 462 config-targets := 1 463 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),) 464 mixed-targets := 1 465 endif 466 endif 467endif 468 469ifeq ($(mixed-targets),1) 470# =========================================================================== 471# We're called with mixed targets (*config and build targets). 472# Handle them one by one. 473 474%:: FORCE 475 $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@ 476 477else 478ifeq ($(config-targets),1) 479# =========================================================================== 480# *config targets only - make sure prerequisites are updated, and descend 481# in scripts/kconfig to make the *config target 482 483# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 484# KBUILD_DEFCONFIG may point out an alternative default configuration 485# used for 'make defconfig' 486include $(srctree)/arch/$(SRCARCH)/Makefile 487export KBUILD_DEFCONFIG KBUILD_KCONFIG 488 489config: scripts_basic outputmakefile FORCE 490 $(Q)mkdir -p include/linux include/config 491 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 492 493%config: scripts_basic outputmakefile FORCE 494 $(Q)mkdir -p include/linux include/config 495 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 496 497else 498# =========================================================================== 499# Build targets only - this includes vmlinux, arch specific targets, clean 500# targets and others. In general all targets except *config targets. 501 502ifeq ($(KBUILD_EXTMOD),) 503# Additional helpers built in scripts/ 504# Carefully list dependencies so we do not try to build scripts twice 505# in parallel 506PHONY += scripts 507scripts: scripts_basic include/config/auto.conf include/config/tristate.conf 508 $(Q)$(MAKE) $(build)=$(@) 509 510# Objects we will link into vmlinux / subdirs we need to visit 511init-y := init/ 512drivers-y := drivers/ sound/ firmware/ 513net-y := net/ 514libs-y := lib/ 515core-y := usr/ 516endif # KBUILD_EXTMOD 517 518ifeq ($(dot-config),1) 519# Read in config 520-include include/config/auto.conf 521 522ifeq ($(KBUILD_EXTMOD),) 523# Read in dependencies to all Kconfig* files, make sure to run 524# oldconfig if changes are detected. 525-include include/config/auto.conf.cmd 526 527# To avoid any implicit rule to kick in, define an empty command 528$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ; 529 530# If .config is newer than include/config/auto.conf, someone tinkered 531# with it and forgot to run make oldconfig. 532# if auto.conf.cmd is missing then we are probably in a cleaned tree so 533# we execute the config step to be sure to catch updated Kconfig files 534include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd 535 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig 536else 537# external modules needs include/generated/autoconf.h and include/config/auto.conf 538# but do not care if they are up-to-date. Use auto.conf to trigger the test 539PHONY += include/config/auto.conf 540 541include/config/auto.conf: 542 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 543 echo; \ 544 echo " ERROR: Kernel configuration is invalid."; \ 545 echo " include/generated/autoconf.h or $@ are missing.";\ 546 echo " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 547 echo; \ 548 /bin/false) 549 550endif # KBUILD_EXTMOD 551 552else 553# Dummy target needed, because used as prerequisite 554include/config/auto.conf: ; 555endif # $(dot-config) 556 557# The all: target is the default when no target is given on the 558# command line. 559# This allow a user to issue only 'make' to build a kernel including modules 560# Defaults to vmlinux, but the arch makefile usually adds further targets 561all: vmlinux 562 563ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 564KBUILD_CFLAGS += -Os 565else 566KBUILD_CFLAGS += -O2 567endif 568 569ifdef CONFIG_READABLE_ASM 570# Disable optimizations that make assembler listings hard to read. 571# reorder blocks reorders the control in the function 572# ipa clone creates specialized cloned functions 573# partial inlining inlines only parts of functions 574KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \ 575 $(call cc-option,-fno-ipa-cp-clone,) \ 576 $(call cc-option,-fno-partial-inlining) 577endif 578 579include $(srctree)/arch/$(SRCARCH)/Makefile 580 581ifneq ($(CONFIG_FRAME_WARN),0) 582KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN}) 583endif 584 585# Force gcc to behave correct even for buggy distributions 586ifndef CONFIG_CC_STACKPROTECTOR 587KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector) 588endif 589 590# This warning generated too much noise in a regular build. 591# Use make W=1 to enable this warning (see scripts/Makefile.build) 592KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable) 593 594ifdef CONFIG_FRAME_POINTER 595KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 596else 597# Some targets (ARM with Thumb2, for example), can't be built with frame 598# pointers. For those, we don't have FUNCTION_TRACER automatically 599# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 600# incompatible with -fomit-frame-pointer with current GCC, so we don't use 601# -fomit-frame-pointer with FUNCTION_TRACER. 602ifndef CONFIG_FUNCTION_TRACER 603KBUILD_CFLAGS += -fomit-frame-pointer 604endif 605endif 606 607ifdef CONFIG_DEBUG_INFO 608KBUILD_CFLAGS += -g 609KBUILD_AFLAGS += -gdwarf-2 610endif 611 612ifdef CONFIG_DEBUG_INFO_REDUCED 613KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) 614endif 615 616ifdef CONFIG_FUNCTION_TRACER 617KBUILD_CFLAGS += -pg 618ifdef CONFIG_DYNAMIC_FTRACE 619 ifdef CONFIG_HAVE_C_RECORDMCOUNT 620 BUILD_C_RECORDMCOUNT := y 621 export BUILD_C_RECORDMCOUNT 622 endif 623endif 624endif 625 626# We trigger additional mismatches with less inlining 627ifdef CONFIG_DEBUG_SECTION_MISMATCH 628KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) 629endif 630 631# arch Makefile may override CC so keep this after arch Makefile is included 632NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) 633CHECKFLAGS += $(NOSTDINC_FLAGS) 634 635# warn about C99 declaration after statement 636KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,) 637 638# disable pointer signed / unsigned warnings in gcc 4.0 639KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign) 640 641# disable invalid "can't wrap" optimizations for signed / pointers 642KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow) 643 644# conserve stack if available 645KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) 646 647# use the deterministic mode of AR if available 648KBUILD_ARFLAGS := $(call ar-option,D) 649 650# check for 'asm goto' 651ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y) 652 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO 653endif 654 655# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments 656# But warn user when we do so 657warn-assign = \ 658$(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)") 659 660ifneq ($(KCPPFLAGS),) 661 $(call warn-assign,CPPFLAGS) 662 KBUILD_CPPFLAGS += $(KCPPFLAGS) 663endif 664ifneq ($(KAFLAGS),) 665 $(call warn-assign,AFLAGS) 666 KBUILD_AFLAGS += $(KAFLAGS) 667endif 668ifneq ($(KCFLAGS),) 669 $(call warn-assign,CFLAGS) 670 KBUILD_CFLAGS += $(KCFLAGS) 671endif 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) $(INSTALL_MOD_STRIP) 715endif # INSTALL_MOD_STRIP=1 716else 717mod_strip_cmd = true 718endif # INSTALL_MOD_STRIP 719export mod_strip_cmd 720 721 722ifeq ($(KBUILD_EXTMOD),) 723core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/ 724 725vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \ 726 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 727 $(net-y) $(net-m) $(libs-y) $(libs-m))) 728 729vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \ 730 $(init-n) $(init-) \ 731 $(core-n) $(core-) $(drivers-n) $(drivers-) \ 732 $(net-n) $(net-) $(libs-n) $(libs-)))) 733 734init-y := $(patsubst %/, %/built-in.o, $(init-y)) 735core-y := $(patsubst %/, %/built-in.o, $(core-y)) 736drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y)) 737net-y := $(patsubst %/, %/built-in.o, $(net-y)) 738libs-y1 := $(patsubst %/, %/lib.a, $(libs-y)) 739libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y)) 740libs-y := $(libs-y1) $(libs-y2) 741 742# Build vmlinux 743# --------------------------------------------------------------------------- 744# vmlinux is built from the objects selected by $(vmlinux-init) and 745# $(vmlinux-main). Most are built-in.o files from top-level directories 746# in the kernel tree, others are specified in arch/$(ARCH)/Makefile. 747# Ordering when linking is important, and $(vmlinux-init) must be first. 748# 749# vmlinux 750# ^ 751# | 752# +-< $(vmlinux-init) 753# | +--< init/version.o + more 754# | 755# +--< $(vmlinux-main) 756# | +--< driver/built-in.o mm/built-in.o + more 757# | 758# +-< kallsyms.o (see description in CONFIG_KALLSYMS section) 759# 760# vmlinux version (uname -v) cannot be updated during normal 761# descending-into-subdirs phase since we do not yet know if we need to 762# update vmlinux. 763# Therefore this step is delayed until just before final link of vmlinux - 764# except in the kallsyms case where it is done just before adding the 765# symbols to the kernel. 766# 767# System.map is generated to document addresses of all kernel symbols 768 769vmlinux-init := $(head-y) $(init-y) 770vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y) 771vmlinux-all := $(vmlinux-init) $(vmlinux-main) 772vmlinux-lds := arch/$(SRCARCH)/kernel/vmlinux.lds 773export KBUILD_VMLINUX_OBJS := $(vmlinux-all) 774 775# Rule to link vmlinux - also used during CONFIG_KALLSYMS 776# May be overridden by arch/$(ARCH)/Makefile 777quiet_cmd_vmlinux__ ?= LD $@ 778 cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \ 779 -T $(vmlinux-lds) $(vmlinux-init) \ 780 --start-group $(vmlinux-main) --end-group \ 781 $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^) 782 783# Generate new vmlinux version 784quiet_cmd_vmlinux_version = GEN .version 785 cmd_vmlinux_version = set -e; \ 786 if [ ! -r .version ]; then \ 787 rm -f .version; \ 788 echo 1 >.version; \ 789 else \ 790 mv .version .old_version; \ 791 expr 0$$(cat .old_version) + 1 >.version; \ 792 fi; \ 793 $(MAKE) $(build)=init 794 795# Generate System.map 796quiet_cmd_sysmap = SYSMAP 797 cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap 798 799# Sort exception table at build time 800quiet_cmd_sortextable = SORTEX 801 cmd_sortextable = $(objtree)/scripts/sortextable 802 803# Link of vmlinux 804# If CONFIG_KALLSYMS is set .version is already updated 805# Generate System.map and verify that the content is consistent 806# Use + in front of the vmlinux_version rule to silent warning with make -j2 807# First command is ':' to allow us to use + in front of the rule 808define rule_vmlinux__ 809 : 810 $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version)) 811 812 $(call cmd,vmlinux__) 813 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd 814 815 $(if $(CONFIG_BUILDTIME_EXTABLE_SORT), \ 816 $(Q)$(if $($(quiet)cmd_sortextable), \ 817 echo ' $($(quiet)cmd_sortextable) vmlinux' &&) \ 818 $(cmd_sortextable) vmlinux) 819 820 821 $(Q)$(if $($(quiet)cmd_sysmap), \ 822 echo ' $($(quiet)cmd_sysmap) System.map' &&) \ 823 $(cmd_sysmap) $@ System.map; \ 824 if [ $$? -ne 0 ]; then \ 825 rm -f $@; \ 826 /bin/false; \ 827 fi; 828 $(verify_kallsyms) 829endef 830 831 832ifdef CONFIG_KALLSYMS 833# Generate section listing all symbols and add it into vmlinux $(kallsyms.o) 834# It's a three stage process: 835# o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is 836# empty 837# Running kallsyms on that gives us .tmp_kallsyms1.o with 838# the right size - vmlinux version (uname -v) is updated during this step 839# o .tmp_vmlinux2 now has a __kallsyms section of the right size, 840# but due to the added section, some addresses have shifted. 841# From here, we generate a correct .tmp_kallsyms2.o 842# o The correct .tmp_kallsyms2.o is linked into the final vmlinux. 843# o Verify that the System.map from vmlinux matches the map from 844# .tmp_vmlinux2, just in case we did not generate kallsyms correctly. 845# o If 'make KALLSYMS_EXTRA_PASS=1" was used, do an extra pass using 846# .tmp_vmlinux3 and .tmp_kallsyms3.o. This is only meant as a 847# temporary bypass to allow the kernel to be built while the 848# maintainers work out what went wrong with kallsyms. 849 850last_kallsyms := 2 851 852ifdef KALLSYMS_EXTRA_PASS 853ifneq ($(KALLSYMS_EXTRA_PASS),0) 854last_kallsyms := 3 855endif 856endif 857 858kallsyms.o := .tmp_kallsyms$(last_kallsyms).o 859 860define verify_kallsyms 861 $(Q)$(if $($(quiet)cmd_sysmap), \ 862 echo ' $($(quiet)cmd_sysmap) .tmp_System.map' &&) \ 863 $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map 864 $(Q)cmp -s System.map .tmp_System.map || \ 865 (echo Inconsistent kallsyms data; \ 866 echo This is a bug - please report about it; \ 867 echo Try "make KALLSYMS_EXTRA_PASS=1" as a workaround; \ 868 rm .tmp_kallsyms* ; /bin/false ) 869endef 870 871# Update vmlinux version before link 872# Use + in front of this rule to silent warning about make -j1 873# First command is ':' to allow us to use + in front of this rule 874cmd_ksym_ld = $(cmd_vmlinux__) 875define rule_ksym_ld 876 : 877 +$(call cmd,vmlinux_version) 878 $(call cmd,vmlinux__) 879 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd 880endef 881 882# Generate .S file with all kernel symbols 883quiet_cmd_kallsyms = KSYM $@ 884 cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \ 885 $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@ 886 887.tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE 888 $(call if_changed_dep,as_o_S) 889 890.tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS) 891 $(call cmd,kallsyms) 892 893# .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version 894.tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE 895 $(call if_changed_rule,ksym_ld) 896 897.tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE 898 $(call if_changed,vmlinux__) 899 900.tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE 901 $(call if_changed,vmlinux__) 902 903# Needs to visit scripts/ before $(KALLSYMS) can be used. 904$(KALLSYMS): scripts ; 905 906# Generate some data for debugging strange kallsyms problems 907debug_kallsyms: .tmp_map$(last_kallsyms) 908 909.tmp_map%: .tmp_vmlinux% FORCE 910 ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@ 911 912.tmp_map3: .tmp_map2 913 914.tmp_map2: .tmp_map1 915 916endif # ifdef CONFIG_KALLSYMS 917 918# Do modpost on a prelinked vmlinux. The finally linked vmlinux has 919# relevant sections renamed as per the linker script. 920quiet_cmd_vmlinux-modpost = LD $@ 921 cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@ \ 922 $(vmlinux-init) --start-group $(vmlinux-main) --end-group \ 923 $(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^) 924define rule_vmlinux-modpost 925 : 926 +$(call cmd,vmlinux-modpost) 927 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@ 928 $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd 929endef 930 931# vmlinux image - including updated kernel symbols 932vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) FORCE 933ifdef CONFIG_HEADERS_CHECK 934 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check 935endif 936ifdef CONFIG_SAMPLES 937 $(Q)$(MAKE) $(build)=samples 938endif 939ifdef CONFIG_BUILD_DOCSRC 940 $(Q)$(MAKE) $(build)=Documentation 941endif 942 $(call vmlinux-modpost) 943 $(call if_changed_rule,vmlinux__) 944 $(Q)rm -f .old_version 945 946# build vmlinux.o first to catch section mismatch errors early 947ifdef CONFIG_KALLSYMS 948.tmp_vmlinux1: vmlinux.o 949endif 950 951modpost-init := $(filter-out init/built-in.o, $(vmlinux-init)) 952vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE 953 $(call if_changed_rule,vmlinux-modpost) 954 955# The actual objects are generated when descending, 956# make sure no implicit rule kicks in 957$(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ; 958 959# Handle descending into subdirectories listed in $(vmlinux-dirs) 960# Preset locale variables to speed up the build process. Limit locale 961# tweaks to this spot to avoid wrong language settings when running 962# make menuconfig etc. 963# Error messages still appears in the original language 964 965PHONY += $(vmlinux-dirs) 966$(vmlinux-dirs): prepare scripts 967 $(Q)$(MAKE) $(build)=$@ 968 969# Store (new) KERNELRELASE string in include/config/kernel.release 970include/config/kernel.release: include/config/auto.conf FORCE 971 $(Q)rm -f $@ 972 $(Q)echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" > $@ 973 974 975# Things we need to do before we recursively start building the kernel 976# or the modules are listed in "prepare". 977# A multi level approach is used. prepareN is processed before prepareN-1. 978# archprepare is used in arch Makefiles and when processed asm symlink, 979# version.h and scripts_basic is processed / created. 980 981# Listed in dependency order 982PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3 983 984# prepare3 is used to check if we are building in a separate output directory, 985# and if so do: 986# 1) Check that make has not been executed in the kernel src $(srctree) 987prepare3: include/config/kernel.release 988ifneq ($(KBUILD_SRC),) 989 @$(kecho) ' Using $(srctree) as source for kernel' 990 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \ 991 echo " $(srctree) is not clean, please run 'make mrproper'"; \ 992 echo " in the '$(srctree)' directory.";\ 993 /bin/false; \ 994 fi; 995endif 996 997# prepare2 creates a makefile if using a separate output directory 998prepare2: prepare3 outputmakefile asm-generic 999 1000prepare1: prepare2 include/linux/version.h include/generated/utsrelease.h \ 1001 include/config/auto.conf 1002 $(cmd_crmodverdir) 1003 1004archprepare: archheaders archscripts prepare1 scripts_basic 1005 1006prepare0: archprepare FORCE 1007 $(Q)$(MAKE) $(build)=. 1008 1009# All the preparing.. 1010prepare: prepare0 1011 1012# Generate some files 1013# --------------------------------------------------------------------------- 1014 1015# KERNELRELEASE can change from a few different places, meaning version.h 1016# needs to be updated, so this check is forced on all builds 1017 1018uts_len := 64 1019define filechk_utsrelease.h 1020 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1021 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1022 exit 1; \ 1023 fi; \ 1024 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";) 1025endef 1026 1027define filechk_version.h 1028 (echo \#define LINUX_VERSION_CODE $(shell \ 1029 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \ 1030 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';) 1031endef 1032 1033include/linux/version.h: $(srctree)/Makefile FORCE 1034 $(call filechk,version.h) 1035 1036include/generated/utsrelease.h: include/config/kernel.release FORCE 1037 $(call filechk,utsrelease.h) 1038 1039PHONY += headerdep 1040headerdep: 1041 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1042 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1043 1044# --------------------------------------------------------------------------- 1045 1046PHONY += depend dep 1047depend dep: 1048 @echo '*** Warning: make $@ is unnecessary now.' 1049 1050# --------------------------------------------------------------------------- 1051# Firmware install 1052INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware 1053export INSTALL_FW_PATH 1054 1055PHONY += firmware_install 1056firmware_install: FORCE 1057 @mkdir -p $(objtree)/firmware 1058 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install 1059 1060# --------------------------------------------------------------------------- 1061# Kernel headers 1062 1063#Default location for installed headers 1064export INSTALL_HDR_PATH = $(objtree)/usr 1065 1066hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj 1067 1068# If we do an all arch process set dst to asm-$(hdr-arch) 1069hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm) 1070 1071PHONY += archheaders 1072archheaders: 1073 1074PHONY += archscripts 1075archscripts: 1076 1077PHONY += __headers 1078__headers: include/linux/version.h scripts_basic asm-generic archheaders archscripts FORCE 1079 $(Q)$(MAKE) $(build)=scripts build_unifdef 1080 1081PHONY += headers_install_all 1082headers_install_all: 1083 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install 1084 1085PHONY += headers_install 1086headers_install: __headers 1087 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/asm/Kbuild),, \ 1088 $(error Headers not exportable for the $(SRCARCH) architecture)) 1089 $(Q)$(MAKE) $(hdr-inst)=include 1090 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst) 1091 1092PHONY += headers_check_all 1093headers_check_all: headers_install_all 1094 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check 1095 1096PHONY += headers_check 1097headers_check: headers_install 1098 $(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1 1099 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst) HDRCHECK=1 1100 1101# --------------------------------------------------------------------------- 1102# Modules 1103 1104ifdef CONFIG_MODULES 1105 1106# By default, build modules as well 1107 1108all: modules 1109 1110# Build modules 1111# 1112# A module can be listed more than once in obj-m resulting in 1113# duplicate lines in modules.order files. Those are removed 1114# using awk while concatenating to the final file. 1115 1116PHONY += modules 1117modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin 1118 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order 1119 @$(kecho) ' Building modules, stage 2.'; 1120 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1121 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild 1122 1123modules.builtin: $(vmlinux-dirs:%=%/modules.builtin) 1124 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin 1125 1126%/modules.builtin: include/config/auto.conf 1127 $(Q)$(MAKE) $(modbuiltin)=$* 1128 1129 1130# Target to prepare building external modules 1131PHONY += modules_prepare 1132modules_prepare: prepare scripts 1133 1134# Target to install modules 1135PHONY += modules_install 1136modules_install: _modinst_ _modinst_post 1137 1138PHONY += _modinst_ 1139_modinst_: 1140 @rm -rf $(MODLIB)/kernel 1141 @rm -f $(MODLIB)/source 1142 @mkdir -p $(MODLIB)/kernel 1143 @ln -s $(srctree) $(MODLIB)/source 1144 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1145 rm -f $(MODLIB)/build ; \ 1146 ln -s $(objtree) $(MODLIB)/build ; \ 1147 fi 1148 @cp -f $(objtree)/modules.order $(MODLIB)/ 1149 @cp -f $(objtree)/modules.builtin $(MODLIB)/ 1150 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1151 1152# This depmod is only for convenience to give the initial 1153# boot a modules.dep even before / is mounted read-write. However the 1154# boot script depmod is the master version. 1155PHONY += _modinst_post 1156_modinst_post: _modinst_ 1157 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst 1158 $(call cmd,depmod) 1159 1160else # CONFIG_MODULES 1161 1162# Modules not configured 1163# --------------------------------------------------------------------------- 1164 1165modules modules_install: FORCE 1166 @echo 1167 @echo "The present kernel configuration has modules disabled." 1168 @echo "Type 'make config' and enable loadable module support." 1169 @echo "Then build a kernel with module support enabled." 1170 @echo 1171 @exit 1 1172 1173endif # CONFIG_MODULES 1174 1175### 1176# Cleaning is done on three levels. 1177# make clean Delete most generated files 1178# Leave enough to build external modules 1179# make mrproper Delete the current configuration, and all generated files 1180# make distclean Remove editor backup files, patch leftover files and the like 1181 1182# Directories & files removed with 'make clean' 1183CLEAN_DIRS += $(MODVERDIR) 1184CLEAN_FILES += vmlinux System.map \ 1185 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map 1186 1187# Directories & files removed with 'make mrproper' 1188MRPROPER_DIRS += include/config usr/include include/generated \ 1189 arch/*/include/generated 1190MRPROPER_FILES += .config .config.old .version .old_version \ 1191 include/linux/version.h \ 1192 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS 1193 1194# clean - Delete most, but leave enough to build external modules 1195# 1196clean: rm-dirs := $(CLEAN_DIRS) 1197clean: rm-files := $(CLEAN_FILES) 1198clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples) 1199 1200PHONY += $(clean-dirs) clean archclean 1201$(clean-dirs): 1202 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1203 1204clean: archclean 1205 1206# mrproper - Delete all generated files, including .config 1207# 1208mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS)) 1209mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1210mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts) 1211 1212PHONY += $(mrproper-dirs) mrproper archmrproper 1213$(mrproper-dirs): 1214 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1215 1216mrproper: clean archmrproper $(mrproper-dirs) 1217 $(call cmd,rmdirs) 1218 $(call cmd,rmfiles) 1219 1220# distclean 1221# 1222PHONY += distclean 1223 1224distclean: mrproper 1225 @find $(srctree) $(RCS_FIND_IGNORE) \ 1226 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1227 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \ 1228 -o -name '.*.rej' \ 1229 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \ 1230 -type f -print | xargs rm -f 1231 1232 1233# Packaging of the kernel to various formats 1234# --------------------------------------------------------------------------- 1235# rpm target kept for backward compatibility 1236package-dir := $(srctree)/scripts/package 1237 1238%src-pkg: FORCE 1239 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1240%pkg: include/config/kernel.release FORCE 1241 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1242rpm: include/config/kernel.release FORCE 1243 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1244 1245 1246# Brief documentation of the typical targets used 1247# --------------------------------------------------------------------------- 1248 1249boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1250boards := $(notdir $(boards)) 1251board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1252board-dirs := $(sort $(notdir $(board-dirs:/=))) 1253 1254help: 1255 @echo 'Cleaning targets:' 1256 @echo ' clean - Remove most generated files but keep the config and' 1257 @echo ' enough build support to build external modules' 1258 @echo ' mrproper - Remove all generated files + config + various backup files' 1259 @echo ' distclean - mrproper + remove editor backup and patch files' 1260 @echo '' 1261 @echo 'Configuration targets:' 1262 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1263 @echo '' 1264 @echo 'Other generic targets:' 1265 @echo ' all - Build all targets marked with [*]' 1266 @echo '* vmlinux - Build the bare kernel' 1267 @echo '* modules - Build all modules' 1268 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1269 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH' 1270 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)' 1271 @echo ' dir/ - Build all files in dir and below' 1272 @echo ' dir/file.[oisS] - Build specified target only' 1273 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1274 @echo ' (requires a recent binutils and recent build (System.map))' 1275 @echo ' dir/file.ko - Build module including final link' 1276 @echo ' modules_prepare - Set up for building external modules' 1277 @echo ' tags/TAGS - Generate tags file for editors' 1278 @echo ' cscope - Generate cscope index' 1279 @echo ' gtags - Generate GNU GLOBAL index' 1280 @echo ' kernelrelease - Output the release version string' 1281 @echo ' kernelversion - Output the version stored in Makefile' 1282 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1283 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1284 echo '' 1285 @echo 'Static analysers' 1286 @echo ' checkstack - Generate a list of stack hogs' 1287 @echo ' namespacecheck - Name space analysis on compiled kernel' 1288 @echo ' versioncheck - Sanity check on version.h usage' 1289 @echo ' includecheck - Check for duplicate included header files' 1290 @echo ' export_report - List the usages of all exported symbols' 1291 @echo ' headers_check - Sanity check on exported headers' 1292 @echo ' headerdep - Detect inclusion cycles in headers' 1293 @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help 1294 @echo '' 1295 @echo 'Kernel packaging:' 1296 @$(MAKE) $(build)=$(package-dir) help 1297 @echo '' 1298 @echo 'Documentation targets:' 1299 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp 1300 @echo '' 1301 @echo 'Architecture specific targets ($(SRCARCH)):' 1302 @$(if $(archhelp),$(archhelp),\ 1303 echo ' No architecture specific help defined for $(SRCARCH)') 1304 @echo '' 1305 @$(if $(boards), \ 1306 $(foreach b, $(boards), \ 1307 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1308 echo '') 1309 @$(if $(board-dirs), \ 1310 $(foreach b, $(board-dirs), \ 1311 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1312 printf " %-16s - Show all of the above\\n" help-boards; \ 1313 echo '') 1314 1315 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1316 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1317 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1318 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)' 1319 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1320 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1321 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where' 1322 @echo ' 1: warnings which may be relevant and do not occur too often' 1323 @echo ' 2: warnings which occur quite often but may still be relevant' 1324 @echo ' 3: more obscure warnings, can most likely be ignored' 1325 @echo ' Multiple levels can be combined with W=12 or W=123' 1326 @echo '' 1327 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1328 @echo 'For further info see the ./README file' 1329 1330 1331help-board-dirs := $(addprefix help-,$(board-dirs)) 1332 1333help-boards: $(help-board-dirs) 1334 1335boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)) 1336 1337$(help-board-dirs): help-%: 1338 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1339 @$(if $(boards-per-dir), \ 1340 $(foreach b, $(boards-per-dir), \ 1341 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1342 echo '') 1343 1344 1345# Documentation targets 1346# --------------------------------------------------------------------------- 1347%docs: scripts_basic FORCE 1348 $(Q)$(MAKE) $(build)=scripts build_docproc 1349 $(Q)$(MAKE) $(build)=Documentation/DocBook $@ 1350 1351else # KBUILD_EXTMOD 1352 1353### 1354# External module support. 1355# When building external modules the kernel used as basis is considered 1356# read-only, and no consistency checks are made and the make 1357# system is not used on the basis kernel. If updates are required 1358# in the basis kernel ordinary make commands (without M=...) must 1359# be used. 1360# 1361# The following are the only valid targets when building external 1362# modules. 1363# make M=dir clean Delete all automatically generated files 1364# make M=dir modules Make all modules in specified dir 1365# make M=dir Same as 'make M=dir modules' 1366# make M=dir modules_install 1367# Install the modules built in the module directory 1368# Assumes install directory is already created 1369 1370# We are always building modules 1371KBUILD_MODULES := 1 1372PHONY += crmodverdir 1373crmodverdir: 1374 $(cmd_crmodverdir) 1375 1376PHONY += $(objtree)/Module.symvers 1377$(objtree)/Module.symvers: 1378 @test -e $(objtree)/Module.symvers || ( \ 1379 echo; \ 1380 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \ 1381 echo " is missing; modules will have no dependencies and modversions."; \ 1382 echo ) 1383 1384module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD)) 1385PHONY += $(module-dirs) modules 1386$(module-dirs): crmodverdir $(objtree)/Module.symvers 1387 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@) 1388 1389modules: $(module-dirs) 1390 @$(kecho) ' Building modules, stage 2.'; 1391 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1392 1393PHONY += modules_install 1394modules_install: _emodinst_ _emodinst_post 1395 1396install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra) 1397PHONY += _emodinst_ 1398_emodinst_: 1399 $(Q)mkdir -p $(MODLIB)/$(install-dir) 1400 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1401 1402PHONY += _emodinst_post 1403_emodinst_post: _emodinst_ 1404 $(call cmd,depmod) 1405 1406clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD)) 1407 1408PHONY += $(clean-dirs) clean 1409$(clean-dirs): 1410 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1411 1412clean: rm-dirs := $(MODVERDIR) 1413clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers 1414 1415help: 1416 @echo ' Building external modules.' 1417 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1418 @echo '' 1419 @echo ' modules - default target, build the module(s)' 1420 @echo ' modules_install - install the module' 1421 @echo ' clean - remove generated files in module directory only' 1422 @echo '' 1423 1424# Dummies... 1425PHONY += prepare scripts 1426prepare: ; 1427scripts: ; 1428endif # KBUILD_EXTMOD 1429 1430clean: $(clean-dirs) 1431 $(call cmd,rmdirs) 1432 $(call cmd,rmfiles) 1433 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1434 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \ 1435 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1436 -o -name '*.symtypes' -o -name 'modules.order' \ 1437 -o -name modules.builtin -o -name '.tmp_*.o.*' \ 1438 -o -name '*.gcno' \) -type f -print | xargs rm -f 1439 1440# Generate tags for editors 1441# --------------------------------------------------------------------------- 1442quiet_cmd_tags = GEN $@ 1443 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@ 1444 1445tags TAGS cscope gtags: FORCE 1446 $(call cmd,tags) 1447 1448# Scripts to check various things for consistency 1449# --------------------------------------------------------------------------- 1450 1451PHONY += includecheck versioncheck coccicheck namespacecheck export_report 1452 1453includecheck: 1454 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1455 -name '*.[hcS]' -type f -print | sort \ 1456 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1457 1458versioncheck: 1459 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1460 -name '*.[hcS]' -type f -print | sort \ 1461 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1462 1463coccicheck: 1464 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@ 1465 1466namespacecheck: 1467 $(PERL) $(srctree)/scripts/namespace.pl 1468 1469export_report: 1470 $(PERL) $(srctree)/scripts/export_report.pl 1471 1472endif #ifeq ($(config-targets),1) 1473endif #ifeq ($(mixed-targets),1) 1474 1475PHONY += checkstack kernelrelease kernelversion 1476 1477# UML needs a little special treatment here. It wants to use the host 1478# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1479# else wants $(ARCH), including people doing cross-builds, which means 1480# that $(SUBARCH) doesn't work here. 1481ifeq ($(ARCH), um) 1482CHECKSTACK_ARCH := $(SUBARCH) 1483else 1484CHECKSTACK_ARCH := $(ARCH) 1485endif 1486checkstack: 1487 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1488 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1489 1490kernelrelease: 1491 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1492 1493kernelversion: 1494 @echo $(KERNELVERSION) 1495 1496# Clear a bunch of variables before executing the submake 1497tools/: FORCE 1498 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS= -C $(src)/tools/ 1499 1500tools/%: FORCE 1501 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS= -C $(src)/tools/ $* 1502 1503# Single targets 1504# --------------------------------------------------------------------------- 1505# Single targets are compatible with: 1506# - build with mixed source and output 1507# - build with separate output dir 'make O=...' 1508# - external modules 1509# 1510# target-dir => where to store outputfile 1511# build-dir => directory in kernel source tree to use 1512 1513ifeq ($(KBUILD_EXTMOD),) 1514 build-dir = $(patsubst %/,%,$(dir $@)) 1515 target-dir = $(dir $@) 1516else 1517 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@))) 1518 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash)) 1519 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@)) 1520endif 1521 1522%.s: %.c prepare scripts FORCE 1523 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1524%.i: %.c prepare scripts FORCE 1525 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1526%.o: %.c prepare scripts FORCE 1527 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1528%.lst: %.c prepare scripts FORCE 1529 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1530%.s: %.S prepare scripts FORCE 1531 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1532%.o: %.S prepare scripts FORCE 1533 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1534%.symtypes: %.c prepare scripts FORCE 1535 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1536 1537# Modules 1538/: prepare scripts FORCE 1539 $(cmd_crmodverdir) 1540 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1541 $(build)=$(build-dir) 1542%/: prepare scripts FORCE 1543 $(cmd_crmodverdir) 1544 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1545 $(build)=$(build-dir) 1546%.ko: prepare scripts FORCE 1547 $(cmd_crmodverdir) 1548 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1549 $(build)=$(build-dir) $(@:.ko=.o) 1550 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1551 1552# FIXME Should go into a make.lib or something 1553# =========================================================================== 1554 1555quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs))) 1556 cmd_rmdirs = rm -rf $(rm-dirs) 1557 1558quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1559 cmd_rmfiles = rm -f $(rm-files) 1560 1561# Run depmod only if we have System.map and depmod is executable 1562quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) 1563 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1564 $(KERNELRELEASE) 1565 1566# Create temporary dir for module support files 1567# clean it up only when building all modules 1568cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \ 1569 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*) 1570 1571a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \ 1572 $(KBUILD_AFLAGS_KERNEL) \ 1573 $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(KBUILD_CPPFLAGS) \ 1574 $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o) 1575 1576quiet_cmd_as_o_S = AS $@ 1577cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $< 1578 1579# read all saved command lines 1580 1581targets := $(wildcard $(sort $(targets))) 1582cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd)) 1583 1584ifneq ($(cmd_files),) 1585 $(cmd_files): ; # Do not try to update included dependency files 1586 include $(cmd_files) 1587endif 1588 1589# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir 1590# Usage: 1591# $(Q)$(MAKE) $(clean)=dir 1592clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj 1593 1594endif # skip-makefile 1595 1596PHONY += FORCE 1597FORCE: 1598 1599# Declare the contents of the .PHONY variable as phony. We keep that 1600# information in a variable so we can use it in if_changed and friends. 1601.PHONY: $(PHONY) 1602