1VERSION = 3 2PATCHLEVEL = 13 3SUBLEVEL = 0 4EXTRAVERSION = 5NAME = One Giant Leap for Frogkind 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# Avoid interference with shell env settings 26unexport GREP_OPTIONS 27 28# We are using a recursive build, so we need to do a little thinking 29# to get the ordering right. 30# 31# Most importantly: sub-Makefiles should only ever modify files in 32# their own directory. If in some directory we have a dependency on 33# a file in another dir (which doesn't happen often, but it's often 34# unavoidable when linking the built-in.o targets which finally 35# turn into vmlinux), we will call a sub make in that other dir, and 36# after that we are sure that everything which is in that other dir 37# is now up to date. 38# 39# The only cases where we need to modify files which have global 40# effects are thus separated out and done before the recursive 41# descending is started. They are now explicitly listed as the 42# prepare rule. 43 44# To put more focus on warnings, be less verbose as default 45# Use 'make V=1' to see the full commands 46 47ifeq ("$(origin V)", "command line") 48 KBUILD_VERBOSE = $(V) 49endif 50ifndef KBUILD_VERBOSE 51 KBUILD_VERBOSE = 0 52endif 53 54# Call a source code checker (by default, "sparse") as part of the 55# C compilation. 56# 57# Use 'make C=1' to enable checking of only re-compiled files. 58# Use 'make C=2' to enable checking of *all* source files, regardless 59# of whether they are re-compiled or not. 60# 61# See the file "Documentation/sparse.txt" for more details, including 62# where to get the "sparse" utility. 63 64ifeq ("$(origin C)", "command line") 65 KBUILD_CHECKSRC = $(C) 66endif 67ifndef KBUILD_CHECKSRC 68 KBUILD_CHECKSRC = 0 69endif 70 71# Use make M=dir to specify directory of external module to build 72# Old syntax make ... SUBDIRS=$PWD is still supported 73# Setting the environment variable KBUILD_EXTMOD take precedence 74ifdef SUBDIRS 75 KBUILD_EXTMOD ?= $(SUBDIRS) 76endif 77 78ifeq ("$(origin M)", "command line") 79 KBUILD_EXTMOD := $(M) 80endif 81 82# kbuild supports saving output files in a separate directory. 83# To locate output files in a separate directory two syntaxes are supported. 84# In both cases the working directory must be the root of the kernel src. 85# 1) O= 86# Use "make O=dir/to/store/output/files/" 87# 88# 2) Set KBUILD_OUTPUT 89# Set the environment variable KBUILD_OUTPUT to point to the directory 90# where the output files shall be placed. 91# export KBUILD_OUTPUT=dir/to/store/output/files/ 92# make 93# 94# The O= assignment takes precedence over the KBUILD_OUTPUT environment 95# variable. 96 97 98# KBUILD_SRC is set on invocation of make in OBJ directory 99# KBUILD_SRC is not intended to be used by the regular user (for now) 100ifeq ($(KBUILD_SRC),) 101 102# OK, Make called in directory where kernel src resides 103# Do we want to locate output files in a separate directory? 104ifeq ("$(origin O)", "command line") 105 KBUILD_OUTPUT := $(O) 106endif 107 108ifeq ("$(origin W)", "command line") 109 export KBUILD_ENABLE_EXTRA_GCC_CHECKS := $(W) 110endif 111 112# That's our default target when none is given on the command line 113PHONY := _all 114_all: 115 116# Cancel implicit rules on top Makefile 117$(CURDIR)/Makefile Makefile: ; 118 119ifneq ($(KBUILD_OUTPUT),) 120# Invoke a second make in the output directory, passing relevant variables 121# check that the output directory actually exists 122saved-output := $(KBUILD_OUTPUT) 123KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd) 124$(if $(KBUILD_OUTPUT),, \ 125 $(error output directory "$(saved-output)" does not exist)) 126 127PHONY += $(MAKECMDGOALS) sub-make 128 129$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make 130 @: 131 132sub-make: FORCE 133 $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \ 134 KBUILD_SRC=$(CURDIR) \ 135 KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \ 136 $(filter-out _all sub-make,$(MAKECMDGOALS)) 137 138# Leave processing to above invocation of make 139skip-makefile := 1 140endif # ifneq ($(KBUILD_OUTPUT),) 141endif # ifeq ($(KBUILD_SRC),) 142 143# We process the rest of the Makefile if this is the final invocation of make 144ifeq ($(skip-makefile),) 145 146# If building an external module we do not care about the all: rule 147# but instead _all depend on modules 148PHONY += all 149ifeq ($(KBUILD_EXTMOD),) 150_all: all 151else 152_all: modules 153endif 154 155srctree := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR)) 156objtree := $(CURDIR) 157src := $(srctree) 158obj := $(objtree) 159 160VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD)) 161 162export srctree objtree VPATH 163 164 165# SUBARCH tells the usermode build what the underlying arch is. That is set 166# first, and if a usermode build is happening, the "ARCH=um" on the command 167# line overrides the setting of ARCH below. If a native build is happening, 168# then ARCH is assigned, getting whatever value it gets normally, and 169# SUBARCH is subsequently ignored. 170 171SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \ 172 -e s/sun4u/sparc64/ \ 173 -e s/arm.*/arm/ -e s/sa110/arm/ \ 174 -e s/s390x/s390/ -e s/parisc64/parisc/ \ 175 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \ 176 -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ ) 177 178# Cross compiling and selecting different set of gcc/bin-utils 179# --------------------------------------------------------------------------- 180# 181# When performing cross compilation for other architectures ARCH shall be set 182# to the target architecture. (See arch/* for the possibilities). 183# ARCH can be set during invocation of make: 184# make ARCH=ia64 185# Another way is to have ARCH set in the environment. 186# The default ARCH is the host where make is executed. 187 188# CROSS_COMPILE specify the prefix used for all executables used 189# during compilation. Only gcc and related bin-utils executables 190# are prefixed with $(CROSS_COMPILE). 191# CROSS_COMPILE can be set on the command line 192# make CROSS_COMPILE=ia64-linux- 193# Alternatively CROSS_COMPILE can be set in the environment. 194# A third alternative is to store a setting in .config so that plain 195# "make" in the configured kernel build directory always uses that. 196# Default value for CROSS_COMPILE is not to prefix executables 197# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 198ARCH ?= $(SUBARCH) 199CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%) 200 201# Architecture as present in compile.h 202UTS_MACHINE := $(ARCH) 203SRCARCH := $(ARCH) 204 205# Additional ARCH settings for x86 206ifeq ($(ARCH),i386) 207 SRCARCH := x86 208endif 209ifeq ($(ARCH),x86_64) 210 SRCARCH := x86 211endif 212 213# Additional ARCH settings for sparc 214ifeq ($(ARCH),sparc32) 215 SRCARCH := sparc 216endif 217ifeq ($(ARCH),sparc64) 218 SRCARCH := sparc 219endif 220 221# Additional ARCH settings for sh 222ifeq ($(ARCH),sh64) 223 SRCARCH := sh 224endif 225 226# Additional ARCH settings for tile 227ifeq ($(ARCH),tilepro) 228 SRCARCH := tile 229endif 230ifeq ($(ARCH),tilegx) 231 SRCARCH := tile 232endif 233 234# Where to locate arch specific headers 235hdr-arch := $(SRCARCH) 236 237KCONFIG_CONFIG ?= .config 238export KCONFIG_CONFIG 239 240# SHELL used by kbuild 241CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \ 242 else if [ -x /bin/bash ]; then echo /bin/bash; \ 243 else echo sh; fi ; fi) 244 245HOSTCC = gcc 246HOSTCXX = g++ 247HOSTCFLAGS = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer 248HOSTCXXFLAGS = -O2 249 250# Decide whether to build built-in, modular, or both. 251# Normally, just do built-in. 252 253KBUILD_MODULES := 254KBUILD_BUILTIN := 1 255 256# If we have only "make modules", don't compile built-in objects. 257# When we're building modules with modversions, we need to consider 258# the built-in objects during the descend as well, in order to 259# make sure the checksums are up to date before we record them. 260 261ifeq ($(MAKECMDGOALS),modules) 262 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1) 263endif 264 265# If we have "make <whatever> modules", compile modules 266# in addition to whatever we do anyway. 267# Just "make" or "make all" shall build modules as well 268 269ifneq ($(filter all _all modules,$(MAKECMDGOALS)),) 270 KBUILD_MODULES := 1 271endif 272 273ifeq ($(MAKECMDGOALS),) 274 KBUILD_MODULES := 1 275endif 276 277export KBUILD_MODULES KBUILD_BUILTIN 278export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD 279 280# Beautify output 281# --------------------------------------------------------------------------- 282# 283# Normally, we echo the whole command before executing it. By making 284# that echo $($(quiet)$(cmd)), we now have the possibility to set 285# $(quiet) to choose other forms of output instead, e.g. 286# 287# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@ 288# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< 289# 290# If $(quiet) is empty, the whole command will be printed. 291# If it is set to "quiet_", only the short version will be printed. 292# If it is set to "silent_", nothing will be printed at all, since 293# the variable $(silent_cmd_cc_o_c) doesn't exist. 294# 295# A simple variant is to prefix commands with $(Q) - that's useful 296# for commands that shall be hidden in non-verbose mode. 297# 298# $(Q)ln $@ :< 299# 300# If KBUILD_VERBOSE equals 0 then the above command will be hidden. 301# If KBUILD_VERBOSE equals 1 then the above command is displayed. 302 303ifeq ($(KBUILD_VERBOSE),1) 304 quiet = 305 Q = 306else 307 quiet=quiet_ 308 Q = @ 309endif 310 311# If the user is running make -s (silent mode), suppress echoing of 312# commands 313 314ifneq ($(filter s% -s%,$(MAKEFLAGS)),) 315 quiet=silent_ 316endif 317 318export quiet Q KBUILD_VERBOSE 319 320 321# Look for make include files relative to root of kernel src 322MAKEFLAGS += --include-dir=$(srctree) 323 324# We need some generic definitions (do not try to remake the file). 325$(srctree)/scripts/Kbuild.include: ; 326include $(srctree)/scripts/Kbuild.include 327 328# Make variables (CC, etc...) 329 330AS = $(CROSS_COMPILE)as 331LD = $(CROSS_COMPILE)ld 332CC = $(CROSS_COMPILE)gcc 333CPP = $(CC) -E 334AR = $(CROSS_COMPILE)ar 335NM = $(CROSS_COMPILE)nm 336STRIP = $(CROSS_COMPILE)strip 337OBJCOPY = $(CROSS_COMPILE)objcopy 338OBJDUMP = $(CROSS_COMPILE)objdump 339AWK = awk 340GENKSYMS = scripts/genksyms/genksyms 341INSTALLKERNEL := installkernel 342DEPMOD = /sbin/depmod 343PERL = perl 344CHECK = sparse 345 346CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 347 -Wbitwise -Wno-return-void $(CF) 348CFLAGS_MODULE = 349AFLAGS_MODULE = 350LDFLAGS_MODULE = 351CFLAGS_KERNEL = 352AFLAGS_KERNEL = 353CFLAGS_GCOV = -fprofile-arcs -ftest-coverage 354 355 356# Use USERINCLUDE when you must reference the UAPI directories only. 357USERINCLUDE := \ 358 -I$(srctree)/arch/$(hdr-arch)/include/uapi \ 359 -Iarch/$(hdr-arch)/include/generated/uapi \ 360 -I$(srctree)/include/uapi \ 361 -Iinclude/generated/uapi \ 362 -include $(srctree)/include/linux/kconfig.h 363 364# Use LINUXINCLUDE when you must reference the include/ directory. 365# Needed to be compatible with the O= option 366LINUXINCLUDE := \ 367 -I$(srctree)/arch/$(hdr-arch)/include \ 368 -Iarch/$(hdr-arch)/include/generated \ 369 $(if $(KBUILD_SRC), -I$(srctree)/include) \ 370 -Iinclude \ 371 $(USERINCLUDE) 372 373KBUILD_CPPFLAGS := -D__KERNEL__ 374 375KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \ 376 -fno-strict-aliasing -fno-common \ 377 -Werror-implicit-function-declaration \ 378 -Wno-format-security \ 379 -fno-delete-null-pointer-checks 380KBUILD_AFLAGS_KERNEL := 381KBUILD_CFLAGS_KERNEL := 382KBUILD_AFLAGS := -D__ASSEMBLY__ 383KBUILD_AFLAGS_MODULE := -DMODULE 384KBUILD_CFLAGS_MODULE := -DMODULE 385KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds 386 387# Read KERNELRELEASE from include/config/kernel.release (if it exists) 388KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null) 389KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 390 391export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 392export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC 393export CPP AR NM STRIP OBJCOPY OBJDUMP 394export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE 395export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS 396 397export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS 398export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV 399export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 400export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 401export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 402export KBUILD_ARFLAGS 403 404# When compiling out-of-tree modules, put MODVERDIR in the module 405# tree rather than in the kernel tree. The kernel tree might 406# even be read-only. 407export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions 408 409# Files to ignore in find ... statements 410 411RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS \ 412 -o -name .pc -o -name .hg -o -name .git \) -prune -o 413export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 414 --exclude CVS --exclude .pc --exclude .hg --exclude .git 415 416# =========================================================================== 417# Rules shared between *config targets and build targets 418 419# Basic helpers built in scripts/ 420PHONY += scripts_basic 421scripts_basic: 422 $(Q)$(MAKE) $(build)=scripts/basic 423 $(Q)rm -f .tmp_quiet_recordmcount 424 425# To avoid any implicit rule to kick in, define an empty command. 426scripts/basic/%: scripts_basic ; 427 428PHONY += outputmakefile 429# outputmakefile generates a Makefile in the output directory, if using a 430# separate output directory. This allows convenient use of make in the 431# output directory. 432outputmakefile: 433ifneq ($(KBUILD_SRC),) 434 $(Q)ln -fsn $(srctree) source 435 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \ 436 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL) 437endif 438 439# Support for using generic headers in asm-generic 440PHONY += asm-generic 441asm-generic: 442 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \ 443 src=asm obj=arch/$(SRCARCH)/include/generated/asm 444 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \ 445 src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm 446 447# To make sure we do not include .config for any of the *config targets 448# catch them early, and hand them over to scripts/kconfig/Makefile 449# It is allowed to specify more targets when calling make, including 450# mixing *config targets and build targets. 451# For example 'make oldconfig all'. 452# Detect when mixed targets is specified, and make a second invocation 453# of make so .config is not included in this case either (for *config). 454 455version_h := include/generated/uapi/linux/version.h 456 457no-dot-config-targets := clean mrproper distclean \ 458 cscope gtags TAGS tags help %docs check% coccicheck \ 459 $(version_h) headers_% archheaders archscripts \ 460 kernelversion %src-pkg 461 462config-targets := 0 463mixed-targets := 0 464dot-config := 1 465 466ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 467 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 468 dot-config := 0 469 endif 470endif 471 472ifeq ($(KBUILD_EXTMOD),) 473 ifneq ($(filter config %config,$(MAKECMDGOALS)),) 474 config-targets := 1 475 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),) 476 mixed-targets := 1 477 endif 478 endif 479endif 480 481ifeq ($(mixed-targets),1) 482# =========================================================================== 483# We're called with mixed targets (*config and build targets). 484# Handle them one by one. 485 486%:: FORCE 487 $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@ 488 489else 490ifeq ($(config-targets),1) 491# =========================================================================== 492# *config targets only - make sure prerequisites are updated, and descend 493# in scripts/kconfig to make the *config target 494 495# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 496# KBUILD_DEFCONFIG may point out an alternative default configuration 497# used for 'make defconfig' 498include $(srctree)/arch/$(SRCARCH)/Makefile 499export KBUILD_DEFCONFIG KBUILD_KCONFIG 500 501config: scripts_basic outputmakefile FORCE 502 $(Q)mkdir -p include/linux include/config 503 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 504 505%config: scripts_basic outputmakefile FORCE 506 $(Q)mkdir -p include/linux include/config 507 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 508 509else 510# =========================================================================== 511# Build targets only - this includes vmlinux, arch specific targets, clean 512# targets and others. In general all targets except *config targets. 513 514ifeq ($(KBUILD_EXTMOD),) 515# Additional helpers built in scripts/ 516# Carefully list dependencies so we do not try to build scripts twice 517# in parallel 518PHONY += scripts 519scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \ 520 asm-generic 521 $(Q)$(MAKE) $(build)=$(@) 522 523# Objects we will link into vmlinux / subdirs we need to visit 524init-y := init/ 525drivers-y := drivers/ sound/ firmware/ 526net-y := net/ 527libs-y := lib/ 528core-y := usr/ 529endif # KBUILD_EXTMOD 530 531ifeq ($(dot-config),1) 532# Read in config 533-include include/config/auto.conf 534 535ifeq ($(KBUILD_EXTMOD),) 536# Read in dependencies to all Kconfig* files, make sure to run 537# oldconfig if changes are detected. 538-include include/config/auto.conf.cmd 539 540# To avoid any implicit rule to kick in, define an empty command 541$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ; 542 543# If .config is newer than include/config/auto.conf, someone tinkered 544# with it and forgot to run make oldconfig. 545# if auto.conf.cmd is missing then we are probably in a cleaned tree so 546# we execute the config step to be sure to catch updated Kconfig files 547include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd 548 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig 549else 550# external modules needs include/generated/autoconf.h and include/config/auto.conf 551# but do not care if they are up-to-date. Use auto.conf to trigger the test 552PHONY += include/config/auto.conf 553 554include/config/auto.conf: 555 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 556 echo >&2; \ 557 echo >&2 " ERROR: Kernel configuration is invalid."; \ 558 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 559 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 560 echo >&2 ; \ 561 /bin/false) 562 563endif # KBUILD_EXTMOD 564 565else 566# Dummy target needed, because used as prerequisite 567include/config/auto.conf: ; 568endif # $(dot-config) 569 570# The all: target is the default when no target is given on the 571# command line. 572# This allow a user to issue only 'make' to build a kernel including modules 573# Defaults to vmlinux, but the arch makefile usually adds further targets 574all: vmlinux 575 576ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 577KBUILD_CFLAGS += -Os $(call cc-disable-warning,maybe-uninitialized,) 578else 579KBUILD_CFLAGS += -O2 580endif 581 582include $(srctree)/arch/$(SRCARCH)/Makefile 583 584ifdef CONFIG_READABLE_ASM 585# Disable optimizations that make assembler listings hard to read. 586# reorder blocks reorders the control in the function 587# ipa clone creates specialized cloned functions 588# partial inlining inlines only parts of functions 589KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \ 590 $(call cc-option,-fno-ipa-cp-clone,) \ 591 $(call cc-option,-fno-partial-inlining) 592endif 593 594ifneq ($(CONFIG_FRAME_WARN),0) 595KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN}) 596endif 597 598# Handle stack protector mode. 599ifdef CONFIG_CC_STACKPROTECTOR_REGULAR 600 stackp-flag := -fstack-protector 601 ifeq ($(call cc-option, $(stackp-flag)),) 602 $(warning Cannot use CONFIG_CC_STACKPROTECTOR: \ 603 -fstack-protector not supported by compiler)) 604 endif 605else ifdef CONFIG_CC_STACKPROTECTOR_STRONG 606 stackp-flag := -fstack-protector-strong 607 ifeq ($(call cc-option, $(stackp-flag)),) 608 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: \ 609 -fstack-protector-strong not supported by compiler) 610 endif 611else 612 # Force off for distro compilers that enable stack protector by default. 613 stackp-flag := $(call cc-option, -fno-stack-protector) 614endif 615KBUILD_CFLAGS += $(stackp-flag) 616 617# This warning generated too much noise in a regular build. 618# Use make W=1 to enable this warning (see scripts/Makefile.build) 619KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable) 620 621ifdef CONFIG_FRAME_POINTER 622KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 623else 624# Some targets (ARM with Thumb2, for example), can't be built with frame 625# pointers. For those, we don't have FUNCTION_TRACER automatically 626# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 627# incompatible with -fomit-frame-pointer with current GCC, so we don't use 628# -fomit-frame-pointer with FUNCTION_TRACER. 629ifndef CONFIG_FUNCTION_TRACER 630KBUILD_CFLAGS += -fomit-frame-pointer 631endif 632endif 633 634ifdef CONFIG_DEBUG_INFO 635KBUILD_CFLAGS += -g 636KBUILD_AFLAGS += -gdwarf-2 637endif 638 639ifdef CONFIG_DEBUG_INFO_REDUCED 640KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \ 641 $(call cc-option,-fno-var-tracking) 642endif 643 644ifdef CONFIG_FUNCTION_TRACER 645ifdef CONFIG_HAVE_FENTRY 646CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY) 647endif 648KBUILD_CFLAGS += -pg $(CC_USING_FENTRY) 649KBUILD_AFLAGS += $(CC_USING_FENTRY) 650ifdef CONFIG_DYNAMIC_FTRACE 651 ifdef CONFIG_HAVE_C_RECORDMCOUNT 652 BUILD_C_RECORDMCOUNT := y 653 export BUILD_C_RECORDMCOUNT 654 endif 655endif 656endif 657 658# We trigger additional mismatches with less inlining 659ifdef CONFIG_DEBUG_SECTION_MISMATCH 660KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) 661endif 662 663# arch Makefile may override CC so keep this after arch Makefile is included 664NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) 665CHECKFLAGS += $(NOSTDINC_FLAGS) 666 667# warn about C99 declaration after statement 668KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,) 669 670# disable pointer signed / unsigned warnings in gcc 4.0 671KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign) 672 673# disable invalid "can't wrap" optimizations for signed / pointers 674KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow) 675 676# conserve stack if available 677KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) 678 679# disallow errors like 'EXPORT_GPL(foo);' with missing header 680KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int) 681 682# require functions to have arguments in prototypes, not empty 'int foo()' 683KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes) 684 685# use the deterministic mode of AR if available 686KBUILD_ARFLAGS := $(call ar-option,D) 687 688# check for 'asm goto' 689ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y) 690 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO 691endif 692 693# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments 694KBUILD_CPPFLAGS += $(KCPPFLAGS) 695KBUILD_AFLAGS += $(KAFLAGS) 696KBUILD_CFLAGS += $(KCFLAGS) 697 698# Use --build-id when available. 699LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\ 700 $(call cc-ldoption, -Wl$(comma)--build-id,)) 701KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID) 702LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID) 703 704ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 705LDFLAGS_vmlinux += $(call ld-option, -X,) 706endif 707 708# Default kernel image to build when no specific target is given. 709# KBUILD_IMAGE may be overruled on the command line or 710# set in the environment 711# Also any assignments in arch/$(ARCH)/Makefile take precedence over 712# this default value 713export KBUILD_IMAGE ?= vmlinux 714 715# 716# INSTALL_PATH specifies where to place the updated kernel and system map 717# images. Default is /boot, but you can set it to other values 718export INSTALL_PATH ?= /boot 719 720# 721# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 722# relocations required by build roots. This is not defined in the 723# makefile but the argument can be passed to make if needed. 724# 725 726MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 727export MODLIB 728 729# 730# INSTALL_MOD_STRIP, if defined, will cause modules to be 731# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then 732# the default option --strip-debug will be used. Otherwise, 733# INSTALL_MOD_STRIP value will be used as the options to the strip command. 734 735ifdef INSTALL_MOD_STRIP 736ifeq ($(INSTALL_MOD_STRIP),1) 737mod_strip_cmd = $(STRIP) --strip-debug 738else 739mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP) 740endif # INSTALL_MOD_STRIP=1 741else 742mod_strip_cmd = true 743endif # INSTALL_MOD_STRIP 744export mod_strip_cmd 745 746# Select initial ramdisk compression format, default is gzip(1). 747# This shall be used by the dracut(8) tool while creating an initramfs image. 748# 749INITRD_COMPRESS-y := gzip 750INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2 751INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma 752INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz 753INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo 754INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4 755# do not export INITRD_COMPRESS, since we didn't actually 756# choose a sane default compression above. 757# export INITRD_COMPRESS := $(INITRD_COMPRESS-y) 758 759ifdef CONFIG_MODULE_SIG_ALL 760MODSECKEY = ./signing_key.priv 761MODPUBKEY = ./signing_key.x509 762export MODPUBKEY 763mod_sign_cmd = perl $(srctree)/scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODSECKEY) $(MODPUBKEY) 764else 765mod_sign_cmd = true 766endif 767export mod_sign_cmd 768 769 770ifeq ($(KBUILD_EXTMOD),) 771core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/ 772 773vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \ 774 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 775 $(net-y) $(net-m) $(libs-y) $(libs-m))) 776 777vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \ 778 $(init-n) $(init-) \ 779 $(core-n) $(core-) $(drivers-n) $(drivers-) \ 780 $(net-n) $(net-) $(libs-n) $(libs-)))) 781 782init-y := $(patsubst %/, %/built-in.o, $(init-y)) 783core-y := $(patsubst %/, %/built-in.o, $(core-y)) 784drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y)) 785net-y := $(patsubst %/, %/built-in.o, $(net-y)) 786libs-y1 := $(patsubst %/, %/lib.a, $(libs-y)) 787libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y)) 788libs-y := $(libs-y1) $(libs-y2) 789 790# Externally visible symbols (used by link-vmlinux.sh) 791export KBUILD_VMLINUX_INIT := $(head-y) $(init-y) 792export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y) 793export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 794export LDFLAGS_vmlinux 795# used by scripts/pacmage/Makefile 796export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools virt) 797 798vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) 799 800# Final link of vmlinux 801 cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) 802quiet_cmd_link-vmlinux = LINK $@ 803 804# Include targets which we want to 805# execute if the rest of the kernel build went well. 806vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE 807ifdef CONFIG_HEADERS_CHECK 808 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check 809endif 810ifdef CONFIG_SAMPLES 811 $(Q)$(MAKE) $(build)=samples 812endif 813ifdef CONFIG_BUILD_DOCSRC 814 $(Q)$(MAKE) $(build)=Documentation 815endif 816 +$(call if_changed,link-vmlinux) 817 818# The actual objects are generated when descending, 819# make sure no implicit rule kicks in 820$(sort $(vmlinux-deps)): $(vmlinux-dirs) ; 821 822# Handle descending into subdirectories listed in $(vmlinux-dirs) 823# Preset locale variables to speed up the build process. Limit locale 824# tweaks to this spot to avoid wrong language settings when running 825# make menuconfig etc. 826# Error messages still appears in the original language 827 828PHONY += $(vmlinux-dirs) 829$(vmlinux-dirs): prepare scripts 830 $(Q)$(MAKE) $(build)=$@ 831 832define filechk_kernel.release 833 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 834endef 835 836# Store (new) KERNELRELEASE string in include/config/kernel.release 837include/config/kernel.release: include/config/auto.conf FORCE 838 $(call filechk,kernel.release) 839 840 841# Things we need to do before we recursively start building the kernel 842# or the modules are listed in "prepare". 843# A multi level approach is used. prepareN is processed before prepareN-1. 844# archprepare is used in arch Makefiles and when processed asm symlink, 845# version.h and scripts_basic is processed / created. 846 847# Listed in dependency order 848PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3 849 850# prepare3 is used to check if we are building in a separate output directory, 851# and if so do: 852# 1) Check that make has not been executed in the kernel src $(srctree) 853prepare3: include/config/kernel.release 854ifneq ($(KBUILD_SRC),) 855 @$(kecho) ' Using $(srctree) as source for kernel' 856 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \ 857 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \ 858 echo >&2 " in the '$(srctree)' directory.";\ 859 /bin/false; \ 860 fi; 861endif 862 863# prepare2 creates a makefile if using a separate output directory 864prepare2: prepare3 outputmakefile asm-generic 865 866prepare1: prepare2 $(version_h) include/generated/utsrelease.h \ 867 include/config/auto.conf 868 $(cmd_crmodverdir) 869 870archprepare: archheaders archscripts prepare1 scripts_basic 871 872prepare0: archprepare FORCE 873 $(Q)$(MAKE) $(build)=. 874 875# All the preparing.. 876prepare: prepare0 877 878# Generate some files 879# --------------------------------------------------------------------------- 880 881# KERNELRELEASE can change from a few different places, meaning version.h 882# needs to be updated, so this check is forced on all builds 883 884uts_len := 64 885define filechk_utsrelease.h 886 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 887 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 888 exit 1; \ 889 fi; \ 890 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";) 891endef 892 893define filechk_version.h 894 (echo \#define LINUX_VERSION_CODE $(shell \ 895 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \ 896 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';) 897endef 898 899$(version_h): $(srctree)/Makefile FORCE 900 $(call filechk,version.h) 901 902include/generated/utsrelease.h: include/config/kernel.release FORCE 903 $(call filechk,utsrelease.h) 904 905PHONY += headerdep 906headerdep: 907 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 908 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 909 910# --------------------------------------------------------------------------- 911 912PHONY += depend dep 913depend dep: 914 @echo '*** Warning: make $@ is unnecessary now.' 915 916# --------------------------------------------------------------------------- 917# Firmware install 918INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware 919export INSTALL_FW_PATH 920 921PHONY += firmware_install 922firmware_install: FORCE 923 @mkdir -p $(objtree)/firmware 924 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install 925 926# --------------------------------------------------------------------------- 927# Kernel headers 928 929#Default location for installed headers 930export INSTALL_HDR_PATH = $(objtree)/usr 931 932hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj 933 934# If we do an all arch process set dst to asm-$(hdr-arch) 935hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm) 936 937PHONY += archheaders 938archheaders: 939 940PHONY += archscripts 941archscripts: 942 943PHONY += __headers 944__headers: $(version_h) scripts_basic asm-generic archheaders archscripts FORCE 945 $(Q)$(MAKE) $(build)=scripts build_unifdef 946 947PHONY += headers_install_all 948headers_install_all: 949 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install 950 951PHONY += headers_install 952headers_install: __headers 953 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \ 954 $(error Headers not exportable for the $(SRCARCH) architecture)) 955 $(Q)$(MAKE) $(hdr-inst)=include/uapi 956 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) 957 958PHONY += headers_check_all 959headers_check_all: headers_install_all 960 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check 961 962PHONY += headers_check 963headers_check: headers_install 964 $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1 965 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1 966 967# --------------------------------------------------------------------------- 968# Modules 969 970ifdef CONFIG_MODULES 971 972# By default, build modules as well 973 974all: modules 975 976# Build modules 977# 978# A module can be listed more than once in obj-m resulting in 979# duplicate lines in modules.order files. Those are removed 980# using awk while concatenating to the final file. 981 982PHONY += modules 983modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin 984 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order 985 @$(kecho) ' Building modules, stage 2.'; 986 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 987 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild 988 989modules.builtin: $(vmlinux-dirs:%=%/modules.builtin) 990 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin 991 992%/modules.builtin: include/config/auto.conf 993 $(Q)$(MAKE) $(modbuiltin)=$* 994 995 996# Target to prepare building external modules 997PHONY += modules_prepare 998modules_prepare: prepare scripts 999 1000# Target to install modules 1001PHONY += modules_install 1002modules_install: _modinst_ _modinst_post 1003 1004PHONY += _modinst_ 1005_modinst_: 1006 @rm -rf $(MODLIB)/kernel 1007 @rm -f $(MODLIB)/source 1008 @mkdir -p $(MODLIB)/kernel 1009 @ln -s $(srctree) $(MODLIB)/source 1010 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1011 rm -f $(MODLIB)/build ; \ 1012 ln -s $(objtree) $(MODLIB)/build ; \ 1013 fi 1014 @cp -f $(objtree)/modules.order $(MODLIB)/ 1015 @cp -f $(objtree)/modules.builtin $(MODLIB)/ 1016 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1017 1018# This depmod is only for convenience to give the initial 1019# boot a modules.dep even before / is mounted read-write. However the 1020# boot script depmod is the master version. 1021PHONY += _modinst_post 1022_modinst_post: _modinst_ 1023 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst 1024 $(call cmd,depmod) 1025 1026ifeq ($(CONFIG_MODULE_SIG), y) 1027PHONY += modules_sign 1028modules_sign: 1029 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign 1030endif 1031 1032else # CONFIG_MODULES 1033 1034# Modules not configured 1035# --------------------------------------------------------------------------- 1036 1037modules modules_install: FORCE 1038 @echo >&2 1039 @echo >&2 "The present kernel configuration has modules disabled." 1040 @echo >&2 "Type 'make config' and enable loadable module support." 1041 @echo >&2 "Then build a kernel with module support enabled." 1042 @echo >&2 1043 @exit 1 1044 1045endif # CONFIG_MODULES 1046 1047### 1048# Cleaning is done on three levels. 1049# make clean Delete most generated files 1050# Leave enough to build external modules 1051# make mrproper Delete the current configuration, and all generated files 1052# make distclean Remove editor backup files, patch leftover files and the like 1053 1054# Directories & files removed with 'make clean' 1055CLEAN_DIRS += $(MODVERDIR) 1056 1057# Directories & files removed with 'make mrproper' 1058MRPROPER_DIRS += include/config usr/include include/generated \ 1059 arch/*/include/generated 1060MRPROPER_FILES += .config .config.old .version .old_version $(version_h) \ 1061 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \ 1062 signing_key.priv signing_key.x509 x509.genkey \ 1063 extra_certificates signing_key.x509.keyid \ 1064 signing_key.x509.signer 1065 1066# clean - Delete most, but leave enough to build external modules 1067# 1068clean: rm-dirs := $(CLEAN_DIRS) 1069clean: rm-files := $(CLEAN_FILES) 1070clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples) 1071 1072PHONY += $(clean-dirs) clean archclean vmlinuxclean 1073$(clean-dirs): 1074 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1075 1076vmlinuxclean: 1077 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1078 1079clean: archclean vmlinuxclean 1080 1081# mrproper - Delete all generated files, including .config 1082# 1083mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS)) 1084mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1085mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts) 1086 1087PHONY += $(mrproper-dirs) mrproper archmrproper 1088$(mrproper-dirs): 1089 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1090 1091mrproper: clean archmrproper $(mrproper-dirs) 1092 $(call cmd,rmdirs) 1093 $(call cmd,rmfiles) 1094 1095# distclean 1096# 1097PHONY += distclean 1098 1099distclean: mrproper 1100 @find $(srctree) $(RCS_FIND_IGNORE) \ 1101 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1102 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \ 1103 -o -name '.*.rej' \ 1104 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \ 1105 -type f -print | xargs rm -f 1106 1107 1108# Packaging of the kernel to various formats 1109# --------------------------------------------------------------------------- 1110# rpm target kept for backward compatibility 1111package-dir := $(srctree)/scripts/package 1112 1113%src-pkg: FORCE 1114 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1115%pkg: include/config/kernel.release FORCE 1116 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1117rpm: include/config/kernel.release FORCE 1118 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1119 1120 1121# Brief documentation of the typical targets used 1122# --------------------------------------------------------------------------- 1123 1124boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1125boards := $(notdir $(boards)) 1126board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1127board-dirs := $(sort $(notdir $(board-dirs:/=))) 1128 1129help: 1130 @echo 'Cleaning targets:' 1131 @echo ' clean - Remove most generated files but keep the config and' 1132 @echo ' enough build support to build external modules' 1133 @echo ' mrproper - Remove all generated files + config + various backup files' 1134 @echo ' distclean - mrproper + remove editor backup and patch files' 1135 @echo '' 1136 @echo 'Configuration targets:' 1137 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1138 @echo '' 1139 @echo 'Other generic targets:' 1140 @echo ' all - Build all targets marked with [*]' 1141 @echo '* vmlinux - Build the bare kernel' 1142 @echo '* modules - Build all modules' 1143 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1144 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH' 1145 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)' 1146 @echo ' dir/ - Build all files in dir and below' 1147 @echo ' dir/file.[oisS] - Build specified target only' 1148 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1149 @echo ' (requires a recent binutils and recent build (System.map))' 1150 @echo ' dir/file.ko - Build module including final link' 1151 @echo ' modules_prepare - Set up for building external modules' 1152 @echo ' tags/TAGS - Generate tags file for editors' 1153 @echo ' cscope - Generate cscope index' 1154 @echo ' gtags - Generate GNU GLOBAL index' 1155 @echo ' kernelrelease - Output the release version string' 1156 @echo ' kernelversion - Output the version stored in Makefile' 1157 @echo ' image_name - Output the image name' 1158 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1159 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1160 echo '' 1161 @echo 'Static analysers' 1162 @echo ' checkstack - Generate a list of stack hogs' 1163 @echo ' namespacecheck - Name space analysis on compiled kernel' 1164 @echo ' versioncheck - Sanity check on version.h usage' 1165 @echo ' includecheck - Check for duplicate included header files' 1166 @echo ' export_report - List the usages of all exported symbols' 1167 @echo ' headers_check - Sanity check on exported headers' 1168 @echo ' headerdep - Detect inclusion cycles in headers' 1169 @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help 1170 @echo '' 1171 @echo 'Kernel packaging:' 1172 @$(MAKE) $(build)=$(package-dir) help 1173 @echo '' 1174 @echo 'Documentation targets:' 1175 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp 1176 @echo '' 1177 @echo 'Architecture specific targets ($(SRCARCH)):' 1178 @$(if $(archhelp),$(archhelp),\ 1179 echo ' No architecture specific help defined for $(SRCARCH)') 1180 @echo '' 1181 @$(if $(boards), \ 1182 $(foreach b, $(boards), \ 1183 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1184 echo '') 1185 @$(if $(board-dirs), \ 1186 $(foreach b, $(board-dirs), \ 1187 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1188 printf " %-16s - Show all of the above\\n" help-boards; \ 1189 echo '') 1190 1191 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1192 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1193 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1194 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)' 1195 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1196 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1197 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where' 1198 @echo ' 1: warnings which may be relevant and do not occur too often' 1199 @echo ' 2: warnings which occur quite often but may still be relevant' 1200 @echo ' 3: more obscure warnings, can most likely be ignored' 1201 @echo ' Multiple levels can be combined with W=12 or W=123' 1202 @echo '' 1203 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1204 @echo 'For further info see the ./README file' 1205 1206 1207help-board-dirs := $(addprefix help-,$(board-dirs)) 1208 1209help-boards: $(help-board-dirs) 1210 1211boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)) 1212 1213$(help-board-dirs): help-%: 1214 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1215 @$(if $(boards-per-dir), \ 1216 $(foreach b, $(boards-per-dir), \ 1217 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1218 echo '') 1219 1220 1221# Documentation targets 1222# --------------------------------------------------------------------------- 1223%docs: scripts_basic FORCE 1224 $(Q)$(MAKE) $(build)=scripts build_docproc 1225 $(Q)$(MAKE) $(build)=Documentation/DocBook $@ 1226 1227else # KBUILD_EXTMOD 1228 1229### 1230# External module support. 1231# When building external modules the kernel used as basis is considered 1232# read-only, and no consistency checks are made and the make 1233# system is not used on the basis kernel. If updates are required 1234# in the basis kernel ordinary make commands (without M=...) must 1235# be used. 1236# 1237# The following are the only valid targets when building external 1238# modules. 1239# make M=dir clean Delete all automatically generated files 1240# make M=dir modules Make all modules in specified dir 1241# make M=dir Same as 'make M=dir modules' 1242# make M=dir modules_install 1243# Install the modules built in the module directory 1244# Assumes install directory is already created 1245 1246# We are always building modules 1247KBUILD_MODULES := 1 1248PHONY += crmodverdir 1249crmodverdir: 1250 $(cmd_crmodverdir) 1251 1252PHONY += $(objtree)/Module.symvers 1253$(objtree)/Module.symvers: 1254 @test -e $(objtree)/Module.symvers || ( \ 1255 echo; \ 1256 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \ 1257 echo " is missing; modules will have no dependencies and modversions."; \ 1258 echo ) 1259 1260module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD)) 1261PHONY += $(module-dirs) modules 1262$(module-dirs): crmodverdir $(objtree)/Module.symvers 1263 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@) 1264 1265modules: $(module-dirs) 1266 @$(kecho) ' Building modules, stage 2.'; 1267 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1268 1269PHONY += modules_install 1270modules_install: _emodinst_ _emodinst_post 1271 1272install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra) 1273PHONY += _emodinst_ 1274_emodinst_: 1275 $(Q)mkdir -p $(MODLIB)/$(install-dir) 1276 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1277 1278PHONY += _emodinst_post 1279_emodinst_post: _emodinst_ 1280 $(call cmd,depmod) 1281 1282clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD)) 1283 1284PHONY += $(clean-dirs) clean 1285$(clean-dirs): 1286 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1287 1288clean: rm-dirs := $(MODVERDIR) 1289clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers 1290 1291help: 1292 @echo ' Building external modules.' 1293 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1294 @echo '' 1295 @echo ' modules - default target, build the module(s)' 1296 @echo ' modules_install - install the module' 1297 @echo ' clean - remove generated files in module directory only' 1298 @echo '' 1299 1300# Dummies... 1301PHONY += prepare scripts 1302prepare: ; 1303scripts: ; 1304endif # KBUILD_EXTMOD 1305 1306clean: $(clean-dirs) 1307 $(call cmd,rmdirs) 1308 $(call cmd,rmfiles) 1309 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1310 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \ 1311 -o -name '*.ko.*' \ 1312 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1313 -o -name '*.symtypes' -o -name 'modules.order' \ 1314 -o -name modules.builtin -o -name '.tmp_*.o.*' \ 1315 -o -name '*.gcno' \) -type f -print | xargs rm -f 1316 1317# Generate tags for editors 1318# --------------------------------------------------------------------------- 1319quiet_cmd_tags = GEN $@ 1320 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@ 1321 1322tags TAGS cscope gtags: FORCE 1323 $(call cmd,tags) 1324 1325# Scripts to check various things for consistency 1326# --------------------------------------------------------------------------- 1327 1328PHONY += includecheck versioncheck coccicheck namespacecheck export_report 1329 1330includecheck: 1331 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1332 -name '*.[hcS]' -type f -print | sort \ 1333 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1334 1335versioncheck: 1336 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1337 -name '*.[hcS]' -type f -print | sort \ 1338 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1339 1340coccicheck: 1341 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@ 1342 1343namespacecheck: 1344 $(PERL) $(srctree)/scripts/namespace.pl 1345 1346export_report: 1347 $(PERL) $(srctree)/scripts/export_report.pl 1348 1349endif #ifeq ($(config-targets),1) 1350endif #ifeq ($(mixed-targets),1) 1351 1352PHONY += checkstack kernelrelease kernelversion image_name 1353 1354# UML needs a little special treatment here. It wants to use the host 1355# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1356# else wants $(ARCH), including people doing cross-builds, which means 1357# that $(SUBARCH) doesn't work here. 1358ifeq ($(ARCH), um) 1359CHECKSTACK_ARCH := $(SUBARCH) 1360else 1361CHECKSTACK_ARCH := $(ARCH) 1362endif 1363checkstack: 1364 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1365 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1366 1367kernelrelease: 1368 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1369 1370kernelversion: 1371 @echo $(KERNELVERSION) 1372 1373image_name: 1374 @echo $(KBUILD_IMAGE) 1375 1376# Clear a bunch of variables before executing the submake 1377tools/: FORCE 1378 $(Q)mkdir -p $(objtree)/tools 1379 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/ 1380 1381tools/%: FORCE 1382 $(Q)mkdir -p $(objtree)/tools 1383 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/ $* 1384 1385# Single targets 1386# --------------------------------------------------------------------------- 1387# Single targets are compatible with: 1388# - build with mixed source and output 1389# - build with separate output dir 'make O=...' 1390# - external modules 1391# 1392# target-dir => where to store outputfile 1393# build-dir => directory in kernel source tree to use 1394 1395ifeq ($(KBUILD_EXTMOD),) 1396 build-dir = $(patsubst %/,%,$(dir $@)) 1397 target-dir = $(dir $@) 1398else 1399 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@))) 1400 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash)) 1401 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@)) 1402endif 1403 1404%.s: %.c prepare scripts FORCE 1405 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1406%.i: %.c prepare scripts FORCE 1407 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1408%.o: %.c prepare scripts FORCE 1409 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1410%.lst: %.c prepare scripts FORCE 1411 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1412%.s: %.S prepare scripts FORCE 1413 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1414%.o: %.S prepare scripts FORCE 1415 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1416%.symtypes: %.c prepare scripts FORCE 1417 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1418 1419# Modules 1420/: prepare scripts FORCE 1421 $(cmd_crmodverdir) 1422 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1423 $(build)=$(build-dir) 1424%/: prepare scripts FORCE 1425 $(cmd_crmodverdir) 1426 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1427 $(build)=$(build-dir) 1428%.ko: prepare scripts FORCE 1429 $(cmd_crmodverdir) 1430 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1431 $(build)=$(build-dir) $(@:.ko=.o) 1432 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1433 1434# FIXME Should go into a make.lib or something 1435# =========================================================================== 1436 1437quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs))) 1438 cmd_rmdirs = rm -rf $(rm-dirs) 1439 1440quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1441 cmd_rmfiles = rm -f $(rm-files) 1442 1443# Run depmod only if we have System.map and depmod is executable 1444quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) 1445 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1446 $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))" 1447 1448# Create temporary dir for module support files 1449# clean it up only when building all modules 1450cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \ 1451 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*) 1452 1453# read all saved command lines 1454 1455targets := $(wildcard $(sort $(targets))) 1456cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd)) 1457 1458ifneq ($(cmd_files),) 1459 $(cmd_files): ; # Do not try to update included dependency files 1460 include $(cmd_files) 1461endif 1462 1463# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir 1464# Usage: 1465# $(Q)$(MAKE) $(clean)=dir 1466clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj 1467 1468endif # skip-makefile 1469 1470PHONY += FORCE 1471FORCE: 1472 1473# Declare the contents of the .PHONY variable as phony. We keep that 1474# information in a variable so we can use it in if_changed and friends. 1475.PHONY: $(PHONY) 1476