1VERSION = 3 2PATCHLEVEL = 14 3SUBLEVEL = 0 4EXTRAVERSION = -rc1 5NAME = Shuffling Zombie Juror 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 ($(filter 4.%,$(MAKE_VERSION)),) # make-4 315ifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),) 316 quiet=silent_ 317endif 318else # make-3.8x 319ifneq ($(filter s% -s%,$(MAKEFLAGS)),) 320 quiet=silent_ 321endif 322endif 323 324export quiet Q KBUILD_VERBOSE 325 326 327# Look for make include files relative to root of kernel src 328MAKEFLAGS += --include-dir=$(srctree) 329 330# We need some generic definitions (do not try to remake the file). 331$(srctree)/scripts/Kbuild.include: ; 332include $(srctree)/scripts/Kbuild.include 333 334# Make variables (CC, etc...) 335 336AS = $(CROSS_COMPILE)as 337LD = $(CROSS_COMPILE)ld 338CC = $(CROSS_COMPILE)gcc 339CPP = $(CC) -E 340AR = $(CROSS_COMPILE)ar 341NM = $(CROSS_COMPILE)nm 342STRIP = $(CROSS_COMPILE)strip 343OBJCOPY = $(CROSS_COMPILE)objcopy 344OBJDUMP = $(CROSS_COMPILE)objdump 345AWK = awk 346GENKSYMS = scripts/genksyms/genksyms 347INSTALLKERNEL := installkernel 348DEPMOD = /sbin/depmod 349PERL = perl 350CHECK = sparse 351 352CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 353 -Wbitwise -Wno-return-void $(CF) 354CFLAGS_MODULE = 355AFLAGS_MODULE = 356LDFLAGS_MODULE = 357CFLAGS_KERNEL = 358AFLAGS_KERNEL = 359CFLAGS_GCOV = -fprofile-arcs -ftest-coverage 360 361 362# Use USERINCLUDE when you must reference the UAPI directories only. 363USERINCLUDE := \ 364 -I$(srctree)/arch/$(hdr-arch)/include/uapi \ 365 -Iarch/$(hdr-arch)/include/generated/uapi \ 366 -I$(srctree)/include/uapi \ 367 -Iinclude/generated/uapi \ 368 -include $(srctree)/include/linux/kconfig.h 369 370# Use LINUXINCLUDE when you must reference the include/ directory. 371# Needed to be compatible with the O= option 372LINUXINCLUDE := \ 373 -I$(srctree)/arch/$(hdr-arch)/include \ 374 -Iarch/$(hdr-arch)/include/generated \ 375 $(if $(KBUILD_SRC), -I$(srctree)/include) \ 376 -Iinclude \ 377 $(USERINCLUDE) 378 379KBUILD_CPPFLAGS := -D__KERNEL__ 380 381KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \ 382 -fno-strict-aliasing -fno-common \ 383 -Werror-implicit-function-declaration \ 384 -Wno-format-security \ 385 -fno-delete-null-pointer-checks 386KBUILD_AFLAGS_KERNEL := 387KBUILD_CFLAGS_KERNEL := 388KBUILD_AFLAGS := -D__ASSEMBLY__ 389KBUILD_AFLAGS_MODULE := -DMODULE 390KBUILD_CFLAGS_MODULE := -DMODULE 391KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds 392 393# Read KERNELRELEASE from include/config/kernel.release (if it exists) 394KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null) 395KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 396 397export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 398export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC 399export CPP AR NM STRIP OBJCOPY OBJDUMP 400export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE 401export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS 402 403export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS 404export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV 405export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 406export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 407export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 408export KBUILD_ARFLAGS 409 410# When compiling out-of-tree modules, put MODVERDIR in the module 411# tree rather than in the kernel tree. The kernel tree might 412# even be read-only. 413export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions 414 415# Files to ignore in find ... statements 416 417RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS \ 418 -o -name .pc -o -name .hg -o -name .git \) -prune -o 419export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 420 --exclude CVS --exclude .pc --exclude .hg --exclude .git 421 422# =========================================================================== 423# Rules shared between *config targets and build targets 424 425# Basic helpers built in scripts/ 426PHONY += scripts_basic 427scripts_basic: 428 $(Q)$(MAKE) $(build)=scripts/basic 429 $(Q)rm -f .tmp_quiet_recordmcount 430 431# To avoid any implicit rule to kick in, define an empty command. 432scripts/basic/%: scripts_basic ; 433 434PHONY += outputmakefile 435# outputmakefile generates a Makefile in the output directory, if using a 436# separate output directory. This allows convenient use of make in the 437# output directory. 438outputmakefile: 439ifneq ($(KBUILD_SRC),) 440 $(Q)ln -fsn $(srctree) source 441 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \ 442 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL) 443endif 444 445# Support for using generic headers in asm-generic 446PHONY += asm-generic 447asm-generic: 448 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \ 449 src=asm obj=arch/$(SRCARCH)/include/generated/asm 450 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \ 451 src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm 452 453# To make sure we do not include .config for any of the *config targets 454# catch them early, and hand them over to scripts/kconfig/Makefile 455# It is allowed to specify more targets when calling make, including 456# mixing *config targets and build targets. 457# For example 'make oldconfig all'. 458# Detect when mixed targets is specified, and make a second invocation 459# of make so .config is not included in this case either (for *config). 460 461version_h := include/generated/uapi/linux/version.h 462 463no-dot-config-targets := clean mrproper distclean \ 464 cscope gtags TAGS tags help %docs check% coccicheck \ 465 $(version_h) headers_% archheaders archscripts \ 466 kernelversion %src-pkg 467 468config-targets := 0 469mixed-targets := 0 470dot-config := 1 471 472ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 473 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 474 dot-config := 0 475 endif 476endif 477 478ifeq ($(KBUILD_EXTMOD),) 479 ifneq ($(filter config %config,$(MAKECMDGOALS)),) 480 config-targets := 1 481 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),) 482 mixed-targets := 1 483 endif 484 endif 485endif 486 487ifeq ($(mixed-targets),1) 488# =========================================================================== 489# We're called with mixed targets (*config and build targets). 490# Handle them one by one. 491 492%:: FORCE 493 $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@ 494 495else 496ifeq ($(config-targets),1) 497# =========================================================================== 498# *config targets only - make sure prerequisites are updated, and descend 499# in scripts/kconfig to make the *config target 500 501# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 502# KBUILD_DEFCONFIG may point out an alternative default configuration 503# used for 'make defconfig' 504include $(srctree)/arch/$(SRCARCH)/Makefile 505export KBUILD_DEFCONFIG KBUILD_KCONFIG 506 507config: scripts_basic outputmakefile FORCE 508 $(Q)mkdir -p include/linux include/config 509 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 510 511%config: scripts_basic outputmakefile FORCE 512 $(Q)mkdir -p include/linux include/config 513 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 514 515else 516# =========================================================================== 517# Build targets only - this includes vmlinux, arch specific targets, clean 518# targets and others. In general all targets except *config targets. 519 520ifeq ($(KBUILD_EXTMOD),) 521# Additional helpers built in scripts/ 522# Carefully list dependencies so we do not try to build scripts twice 523# in parallel 524PHONY += scripts 525scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \ 526 asm-generic 527 $(Q)$(MAKE) $(build)=$(@) 528 529# Objects we will link into vmlinux / subdirs we need to visit 530init-y := init/ 531drivers-y := drivers/ sound/ firmware/ 532net-y := net/ 533libs-y := lib/ 534core-y := usr/ 535endif # KBUILD_EXTMOD 536 537ifeq ($(dot-config),1) 538# Read in config 539-include include/config/auto.conf 540 541ifeq ($(KBUILD_EXTMOD),) 542# Read in dependencies to all Kconfig* files, make sure to run 543# oldconfig if changes are detected. 544-include include/config/auto.conf.cmd 545 546# To avoid any implicit rule to kick in, define an empty command 547$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ; 548 549# If .config is newer than include/config/auto.conf, someone tinkered 550# with it and forgot to run make oldconfig. 551# if auto.conf.cmd is missing then we are probably in a cleaned tree so 552# we execute the config step to be sure to catch updated Kconfig files 553include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd 554 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig 555else 556# external modules needs include/generated/autoconf.h and include/config/auto.conf 557# but do not care if they are up-to-date. Use auto.conf to trigger the test 558PHONY += include/config/auto.conf 559 560include/config/auto.conf: 561 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 562 echo >&2; \ 563 echo >&2 " ERROR: Kernel configuration is invalid."; \ 564 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 565 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 566 echo >&2 ; \ 567 /bin/false) 568 569endif # KBUILD_EXTMOD 570 571else 572# Dummy target needed, because used as prerequisite 573include/config/auto.conf: ; 574endif # $(dot-config) 575 576# The all: target is the default when no target is given on the 577# command line. 578# This allow a user to issue only 'make' to build a kernel including modules 579# Defaults to vmlinux, but the arch makefile usually adds further targets 580all: vmlinux 581 582ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 583KBUILD_CFLAGS += -Os $(call cc-disable-warning,maybe-uninitialized,) 584else 585KBUILD_CFLAGS += -O2 586endif 587 588include $(srctree)/arch/$(SRCARCH)/Makefile 589 590ifdef CONFIG_READABLE_ASM 591# Disable optimizations that make assembler listings hard to read. 592# reorder blocks reorders the control in the function 593# ipa clone creates specialized cloned functions 594# partial inlining inlines only parts of functions 595KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \ 596 $(call cc-option,-fno-ipa-cp-clone,) \ 597 $(call cc-option,-fno-partial-inlining) 598endif 599 600ifneq ($(CONFIG_FRAME_WARN),0) 601KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN}) 602endif 603 604# Handle stack protector mode. 605ifdef CONFIG_CC_STACKPROTECTOR_REGULAR 606 stackp-flag := -fstack-protector 607 ifeq ($(call cc-option, $(stackp-flag)),) 608 $(warning Cannot use CONFIG_CC_STACKPROTECTOR: \ 609 -fstack-protector not supported by compiler)) 610 endif 611else ifdef CONFIG_CC_STACKPROTECTOR_STRONG 612 stackp-flag := -fstack-protector-strong 613 ifeq ($(call cc-option, $(stackp-flag)),) 614 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: \ 615 -fstack-protector-strong not supported by compiler) 616 endif 617else 618 # Force off for distro compilers that enable stack protector by default. 619 stackp-flag := $(call cc-option, -fno-stack-protector) 620endif 621KBUILD_CFLAGS += $(stackp-flag) 622 623# This warning generated too much noise in a regular build. 624# Use make W=1 to enable this warning (see scripts/Makefile.build) 625KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable) 626 627ifdef CONFIG_FRAME_POINTER 628KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 629else 630# Some targets (ARM with Thumb2, for example), can't be built with frame 631# pointers. For those, we don't have FUNCTION_TRACER automatically 632# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 633# incompatible with -fomit-frame-pointer with current GCC, so we don't use 634# -fomit-frame-pointer with FUNCTION_TRACER. 635ifndef CONFIG_FUNCTION_TRACER 636KBUILD_CFLAGS += -fomit-frame-pointer 637endif 638endif 639 640ifdef CONFIG_DEBUG_INFO 641KBUILD_CFLAGS += -g 642KBUILD_AFLAGS += -Wa,--gdwarf-2 643endif 644 645ifdef CONFIG_DEBUG_INFO_REDUCED 646KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \ 647 $(call cc-option,-fno-var-tracking) 648endif 649 650ifdef CONFIG_FUNCTION_TRACER 651ifdef CONFIG_HAVE_FENTRY 652CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY) 653endif 654KBUILD_CFLAGS += -pg $(CC_USING_FENTRY) 655KBUILD_AFLAGS += $(CC_USING_FENTRY) 656ifdef CONFIG_DYNAMIC_FTRACE 657 ifdef CONFIG_HAVE_C_RECORDMCOUNT 658 BUILD_C_RECORDMCOUNT := y 659 export BUILD_C_RECORDMCOUNT 660 endif 661endif 662endif 663 664# We trigger additional mismatches with less inlining 665ifdef CONFIG_DEBUG_SECTION_MISMATCH 666KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) 667endif 668 669# arch Makefile may override CC so keep this after arch Makefile is included 670NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) 671CHECKFLAGS += $(NOSTDINC_FLAGS) 672 673# warn about C99 declaration after statement 674KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,) 675 676# disable pointer signed / unsigned warnings in gcc 4.0 677KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign) 678 679# disable invalid "can't wrap" optimizations for signed / pointers 680KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow) 681 682# conserve stack if available 683KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) 684 685# disallow errors like 'EXPORT_GPL(foo);' with missing header 686KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int) 687 688# require functions to have arguments in prototypes, not empty 'int foo()' 689KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes) 690 691# Prohibit date/time macros, which would make the build non-deterministic 692KBUILD_CFLAGS += $(call cc-option,-Werror=date-time) 693 694# use the deterministic mode of AR if available 695KBUILD_ARFLAGS := $(call ar-option,D) 696 697# check for 'asm goto' 698ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y) 699 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO 700endif 701 702# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments 703KBUILD_CPPFLAGS += $(KCPPFLAGS) 704KBUILD_AFLAGS += $(KAFLAGS) 705KBUILD_CFLAGS += $(KCFLAGS) 706 707# Use --build-id when available. 708LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\ 709 $(call cc-ldoption, -Wl$(comma)--build-id,)) 710KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID) 711LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID) 712 713ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 714LDFLAGS_vmlinux += $(call ld-option, -X,) 715endif 716 717# Default kernel image to build when no specific target is given. 718# KBUILD_IMAGE may be overruled on the command line or 719# set in the environment 720# Also any assignments in arch/$(ARCH)/Makefile take precedence over 721# this default value 722export KBUILD_IMAGE ?= vmlinux 723 724# 725# INSTALL_PATH specifies where to place the updated kernel and system map 726# images. Default is /boot, but you can set it to other values 727export INSTALL_PATH ?= /boot 728 729# 730# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 731# relocations required by build roots. This is not defined in the 732# makefile but the argument can be passed to make if needed. 733# 734 735MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 736export MODLIB 737 738# 739# INSTALL_MOD_STRIP, if defined, will cause modules to be 740# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then 741# the default option --strip-debug will be used. Otherwise, 742# INSTALL_MOD_STRIP value will be used as the options to the strip command. 743 744ifdef INSTALL_MOD_STRIP 745ifeq ($(INSTALL_MOD_STRIP),1) 746mod_strip_cmd = $(STRIP) --strip-debug 747else 748mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP) 749endif # INSTALL_MOD_STRIP=1 750else 751mod_strip_cmd = true 752endif # INSTALL_MOD_STRIP 753export mod_strip_cmd 754 755# Select initial ramdisk compression format, default is gzip(1). 756# This shall be used by the dracut(8) tool while creating an initramfs image. 757# 758INITRD_COMPRESS-y := gzip 759INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2 760INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma 761INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz 762INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo 763INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4 764# do not export INITRD_COMPRESS, since we didn't actually 765# choose a sane default compression above. 766# export INITRD_COMPRESS := $(INITRD_COMPRESS-y) 767 768ifdef CONFIG_MODULE_SIG_ALL 769MODSECKEY = ./signing_key.priv 770MODPUBKEY = ./signing_key.x509 771export MODPUBKEY 772mod_sign_cmd = perl $(srctree)/scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODSECKEY) $(MODPUBKEY) 773else 774mod_sign_cmd = true 775endif 776export mod_sign_cmd 777 778 779ifeq ($(KBUILD_EXTMOD),) 780core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/ 781 782vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \ 783 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 784 $(net-y) $(net-m) $(libs-y) $(libs-m))) 785 786vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \ 787 $(init-n) $(init-) \ 788 $(core-n) $(core-) $(drivers-n) $(drivers-) \ 789 $(net-n) $(net-) $(libs-n) $(libs-)))) 790 791init-y := $(patsubst %/, %/built-in.o, $(init-y)) 792core-y := $(patsubst %/, %/built-in.o, $(core-y)) 793drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y)) 794net-y := $(patsubst %/, %/built-in.o, $(net-y)) 795libs-y1 := $(patsubst %/, %/lib.a, $(libs-y)) 796libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y)) 797libs-y := $(libs-y1) $(libs-y2) 798 799# Externally visible symbols (used by link-vmlinux.sh) 800export KBUILD_VMLINUX_INIT := $(head-y) $(init-y) 801export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y) 802export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 803export LDFLAGS_vmlinux 804# used by scripts/pacmage/Makefile 805export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools virt) 806 807vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) 808 809# Final link of vmlinux 810 cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) 811quiet_cmd_link-vmlinux = LINK $@ 812 813# Include targets which we want to 814# execute if the rest of the kernel build went well. 815vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE 816ifdef CONFIG_HEADERS_CHECK 817 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check 818endif 819ifdef CONFIG_SAMPLES 820 $(Q)$(MAKE) $(build)=samples 821endif 822ifdef CONFIG_BUILD_DOCSRC 823 $(Q)$(MAKE) $(build)=Documentation 824endif 825 +$(call if_changed,link-vmlinux) 826 827# The actual objects are generated when descending, 828# make sure no implicit rule kicks in 829$(sort $(vmlinux-deps)): $(vmlinux-dirs) ; 830 831# Handle descending into subdirectories listed in $(vmlinux-dirs) 832# Preset locale variables to speed up the build process. Limit locale 833# tweaks to this spot to avoid wrong language settings when running 834# make menuconfig etc. 835# Error messages still appears in the original language 836 837PHONY += $(vmlinux-dirs) 838$(vmlinux-dirs): prepare scripts 839 $(Q)$(MAKE) $(build)=$@ 840 841define filechk_kernel.release 842 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 843endef 844 845# Store (new) KERNELRELEASE string in include/config/kernel.release 846include/config/kernel.release: include/config/auto.conf FORCE 847 $(call filechk,kernel.release) 848 849 850# Things we need to do before we recursively start building the kernel 851# or the modules are listed in "prepare". 852# A multi level approach is used. prepareN is processed before prepareN-1. 853# archprepare is used in arch Makefiles and when processed asm symlink, 854# version.h and scripts_basic is processed / created. 855 856# Listed in dependency order 857PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3 858 859# prepare3 is used to check if we are building in a separate output directory, 860# and if so do: 861# 1) Check that make has not been executed in the kernel src $(srctree) 862prepare3: include/config/kernel.release 863ifneq ($(KBUILD_SRC),) 864 @$(kecho) ' Using $(srctree) as source for kernel' 865 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \ 866 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \ 867 echo >&2 " in the '$(srctree)' directory.";\ 868 /bin/false; \ 869 fi; 870endif 871 872# prepare2 creates a makefile if using a separate output directory 873prepare2: prepare3 outputmakefile asm-generic 874 875prepare1: prepare2 $(version_h) include/generated/utsrelease.h \ 876 include/config/auto.conf 877 $(cmd_crmodverdir) 878 879archprepare: archheaders archscripts prepare1 scripts_basic 880 881prepare0: archprepare FORCE 882 $(Q)$(MAKE) $(build)=. 883 884# All the preparing.. 885prepare: prepare0 886 887# Generate some files 888# --------------------------------------------------------------------------- 889 890# KERNELRELEASE can change from a few different places, meaning version.h 891# needs to be updated, so this check is forced on all builds 892 893uts_len := 64 894define filechk_utsrelease.h 895 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 896 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 897 exit 1; \ 898 fi; \ 899 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";) 900endef 901 902define filechk_version.h 903 (echo \#define LINUX_VERSION_CODE $(shell \ 904 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \ 905 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';) 906endef 907 908$(version_h): $(srctree)/Makefile FORCE 909 $(call filechk,version.h) 910 911include/generated/utsrelease.h: include/config/kernel.release FORCE 912 $(call filechk,utsrelease.h) 913 914PHONY += headerdep 915headerdep: 916 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 917 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 918 919# --------------------------------------------------------------------------- 920 921PHONY += depend dep 922depend dep: 923 @echo '*** Warning: make $@ is unnecessary now.' 924 925# --------------------------------------------------------------------------- 926# Firmware install 927INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware 928export INSTALL_FW_PATH 929 930PHONY += firmware_install 931firmware_install: FORCE 932 @mkdir -p $(objtree)/firmware 933 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install 934 935# --------------------------------------------------------------------------- 936# Kernel headers 937 938#Default location for installed headers 939export INSTALL_HDR_PATH = $(objtree)/usr 940 941hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj 942 943# If we do an all arch process set dst to asm-$(hdr-arch) 944hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm) 945 946PHONY += archheaders 947archheaders: 948 949PHONY += archscripts 950archscripts: 951 952PHONY += __headers 953__headers: $(version_h) scripts_basic asm-generic archheaders archscripts FORCE 954 $(Q)$(MAKE) $(build)=scripts build_unifdef 955 956PHONY += headers_install_all 957headers_install_all: 958 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install 959 960PHONY += headers_install 961headers_install: __headers 962 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \ 963 $(error Headers not exportable for the $(SRCARCH) architecture)) 964 $(Q)$(MAKE) $(hdr-inst)=include/uapi 965 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) 966 967PHONY += headers_check_all 968headers_check_all: headers_install_all 969 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check 970 971PHONY += headers_check 972headers_check: headers_install 973 $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1 974 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1 975 976# --------------------------------------------------------------------------- 977# Modules 978 979ifdef CONFIG_MODULES 980 981# By default, build modules as well 982 983all: modules 984 985# Build modules 986# 987# A module can be listed more than once in obj-m resulting in 988# duplicate lines in modules.order files. Those are removed 989# using awk while concatenating to the final file. 990 991PHONY += modules 992modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin 993 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order 994 @$(kecho) ' Building modules, stage 2.'; 995 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 996 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild 997 998modules.builtin: $(vmlinux-dirs:%=%/modules.builtin) 999 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin 1000 1001%/modules.builtin: include/config/auto.conf 1002 $(Q)$(MAKE) $(modbuiltin)=$* 1003 1004 1005# Target to prepare building external modules 1006PHONY += modules_prepare 1007modules_prepare: prepare scripts 1008 1009# Target to install modules 1010PHONY += modules_install 1011modules_install: _modinst_ _modinst_post 1012 1013PHONY += _modinst_ 1014_modinst_: 1015 @rm -rf $(MODLIB)/kernel 1016 @rm -f $(MODLIB)/source 1017 @mkdir -p $(MODLIB)/kernel 1018 @ln -s $(srctree) $(MODLIB)/source 1019 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1020 rm -f $(MODLIB)/build ; \ 1021 ln -s $(objtree) $(MODLIB)/build ; \ 1022 fi 1023 @cp -f $(objtree)/modules.order $(MODLIB)/ 1024 @cp -f $(objtree)/modules.builtin $(MODLIB)/ 1025 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1026 1027# This depmod is only for convenience to give the initial 1028# boot a modules.dep even before / is mounted read-write. However the 1029# boot script depmod is the master version. 1030PHONY += _modinst_post 1031_modinst_post: _modinst_ 1032 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst 1033 $(call cmd,depmod) 1034 1035ifeq ($(CONFIG_MODULE_SIG), y) 1036PHONY += modules_sign 1037modules_sign: 1038 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign 1039endif 1040 1041else # CONFIG_MODULES 1042 1043# Modules not configured 1044# --------------------------------------------------------------------------- 1045 1046modules modules_install: FORCE 1047 @echo >&2 1048 @echo >&2 "The present kernel configuration has modules disabled." 1049 @echo >&2 "Type 'make config' and enable loadable module support." 1050 @echo >&2 "Then build a kernel with module support enabled." 1051 @echo >&2 1052 @exit 1 1053 1054endif # CONFIG_MODULES 1055 1056### 1057# Cleaning is done on three levels. 1058# make clean Delete most generated files 1059# Leave enough to build external modules 1060# make mrproper Delete the current configuration, and all generated files 1061# make distclean Remove editor backup files, patch leftover files and the like 1062 1063# Directories & files removed with 'make clean' 1064CLEAN_DIRS += $(MODVERDIR) 1065 1066# Directories & files removed with 'make mrproper' 1067MRPROPER_DIRS += include/config usr/include include/generated \ 1068 arch/*/include/generated 1069MRPROPER_FILES += .config .config.old .version .old_version $(version_h) \ 1070 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \ 1071 signing_key.priv signing_key.x509 x509.genkey \ 1072 extra_certificates signing_key.x509.keyid \ 1073 signing_key.x509.signer 1074 1075# clean - Delete most, but leave enough to build external modules 1076# 1077clean: rm-dirs := $(CLEAN_DIRS) 1078clean: rm-files := $(CLEAN_FILES) 1079clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples) 1080 1081PHONY += $(clean-dirs) clean archclean vmlinuxclean 1082$(clean-dirs): 1083 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1084 1085vmlinuxclean: 1086 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1087 1088clean: archclean vmlinuxclean 1089 1090# mrproper - Delete all generated files, including .config 1091# 1092mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS)) 1093mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1094mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts) 1095 1096PHONY += $(mrproper-dirs) mrproper archmrproper 1097$(mrproper-dirs): 1098 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1099 1100mrproper: clean archmrproper $(mrproper-dirs) 1101 $(call cmd,rmdirs) 1102 $(call cmd,rmfiles) 1103 1104# distclean 1105# 1106PHONY += distclean 1107 1108distclean: mrproper 1109 @find $(srctree) $(RCS_FIND_IGNORE) \ 1110 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1111 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \ 1112 -o -name '.*.rej' \ 1113 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \ 1114 -type f -print | xargs rm -f 1115 1116 1117# Packaging of the kernel to various formats 1118# --------------------------------------------------------------------------- 1119# rpm target kept for backward compatibility 1120package-dir := $(srctree)/scripts/package 1121 1122%src-pkg: FORCE 1123 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1124%pkg: include/config/kernel.release FORCE 1125 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1126rpm: include/config/kernel.release FORCE 1127 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1128 1129 1130# Brief documentation of the typical targets used 1131# --------------------------------------------------------------------------- 1132 1133boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1134boards := $(notdir $(boards)) 1135board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1136board-dirs := $(sort $(notdir $(board-dirs:/=))) 1137 1138help: 1139 @echo 'Cleaning targets:' 1140 @echo ' clean - Remove most generated files but keep the config and' 1141 @echo ' enough build support to build external modules' 1142 @echo ' mrproper - Remove all generated files + config + various backup files' 1143 @echo ' distclean - mrproper + remove editor backup and patch files' 1144 @echo '' 1145 @echo 'Configuration targets:' 1146 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1147 @echo '' 1148 @echo 'Other generic targets:' 1149 @echo ' all - Build all targets marked with [*]' 1150 @echo '* vmlinux - Build the bare kernel' 1151 @echo '* modules - Build all modules' 1152 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1153 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH' 1154 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)' 1155 @echo ' dir/ - Build all files in dir and below' 1156 @echo ' dir/file.[oisS] - Build specified target only' 1157 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1158 @echo ' (requires a recent binutils and recent build (System.map))' 1159 @echo ' dir/file.ko - Build module including final link' 1160 @echo ' modules_prepare - Set up for building external modules' 1161 @echo ' tags/TAGS - Generate tags file for editors' 1162 @echo ' cscope - Generate cscope index' 1163 @echo ' gtags - Generate GNU GLOBAL index' 1164 @echo ' kernelrelease - Output the release version string' 1165 @echo ' kernelversion - Output the version stored in Makefile' 1166 @echo ' image_name - Output the image name' 1167 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1168 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1169 echo '' 1170 @echo 'Static analysers' 1171 @echo ' checkstack - Generate a list of stack hogs' 1172 @echo ' namespacecheck - Name space analysis on compiled kernel' 1173 @echo ' versioncheck - Sanity check on version.h usage' 1174 @echo ' includecheck - Check for duplicate included header files' 1175 @echo ' export_report - List the usages of all exported symbols' 1176 @echo ' headers_check - Sanity check on exported headers' 1177 @echo ' headerdep - Detect inclusion cycles in headers' 1178 @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help 1179 @echo '' 1180 @echo 'Kernel packaging:' 1181 @$(MAKE) $(build)=$(package-dir) help 1182 @echo '' 1183 @echo 'Documentation targets:' 1184 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp 1185 @echo '' 1186 @echo 'Architecture specific targets ($(SRCARCH)):' 1187 @$(if $(archhelp),$(archhelp),\ 1188 echo ' No architecture specific help defined for $(SRCARCH)') 1189 @echo '' 1190 @$(if $(boards), \ 1191 $(foreach b, $(boards), \ 1192 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1193 echo '') 1194 @$(if $(board-dirs), \ 1195 $(foreach b, $(board-dirs), \ 1196 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1197 printf " %-16s - Show all of the above\\n" help-boards; \ 1198 echo '') 1199 1200 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1201 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1202 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1203 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)' 1204 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1205 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1206 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where' 1207 @echo ' 1: warnings which may be relevant and do not occur too often' 1208 @echo ' 2: warnings which occur quite often but may still be relevant' 1209 @echo ' 3: more obscure warnings, can most likely be ignored' 1210 @echo ' Multiple levels can be combined with W=12 or W=123' 1211 @echo '' 1212 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1213 @echo 'For further info see the ./README file' 1214 1215 1216help-board-dirs := $(addprefix help-,$(board-dirs)) 1217 1218help-boards: $(help-board-dirs) 1219 1220boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)) 1221 1222$(help-board-dirs): help-%: 1223 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1224 @$(if $(boards-per-dir), \ 1225 $(foreach b, $(boards-per-dir), \ 1226 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1227 echo '') 1228 1229 1230# Documentation targets 1231# --------------------------------------------------------------------------- 1232%docs: scripts_basic FORCE 1233 $(Q)$(MAKE) $(build)=scripts build_docproc 1234 $(Q)$(MAKE) $(build)=Documentation/DocBook $@ 1235 1236else # KBUILD_EXTMOD 1237 1238### 1239# External module support. 1240# When building external modules the kernel used as basis is considered 1241# read-only, and no consistency checks are made and the make 1242# system is not used on the basis kernel. If updates are required 1243# in the basis kernel ordinary make commands (without M=...) must 1244# be used. 1245# 1246# The following are the only valid targets when building external 1247# modules. 1248# make M=dir clean Delete all automatically generated files 1249# make M=dir modules Make all modules in specified dir 1250# make M=dir Same as 'make M=dir modules' 1251# make M=dir modules_install 1252# Install the modules built in the module directory 1253# Assumes install directory is already created 1254 1255# We are always building modules 1256KBUILD_MODULES := 1 1257PHONY += crmodverdir 1258crmodverdir: 1259 $(cmd_crmodverdir) 1260 1261PHONY += $(objtree)/Module.symvers 1262$(objtree)/Module.symvers: 1263 @test -e $(objtree)/Module.symvers || ( \ 1264 echo; \ 1265 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \ 1266 echo " is missing; modules will have no dependencies and modversions."; \ 1267 echo ) 1268 1269module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD)) 1270PHONY += $(module-dirs) modules 1271$(module-dirs): crmodverdir $(objtree)/Module.symvers 1272 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@) 1273 1274modules: $(module-dirs) 1275 @$(kecho) ' Building modules, stage 2.'; 1276 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1277 1278PHONY += modules_install 1279modules_install: _emodinst_ _emodinst_post 1280 1281install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra) 1282PHONY += _emodinst_ 1283_emodinst_: 1284 $(Q)mkdir -p $(MODLIB)/$(install-dir) 1285 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1286 1287PHONY += _emodinst_post 1288_emodinst_post: _emodinst_ 1289 $(call cmd,depmod) 1290 1291clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD)) 1292 1293PHONY += $(clean-dirs) clean 1294$(clean-dirs): 1295 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1296 1297clean: rm-dirs := $(MODVERDIR) 1298clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers 1299 1300help: 1301 @echo ' Building external modules.' 1302 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1303 @echo '' 1304 @echo ' modules - default target, build the module(s)' 1305 @echo ' modules_install - install the module' 1306 @echo ' clean - remove generated files in module directory only' 1307 @echo '' 1308 1309# Dummies... 1310PHONY += prepare scripts 1311prepare: ; 1312scripts: ; 1313endif # KBUILD_EXTMOD 1314 1315clean: $(clean-dirs) 1316 $(call cmd,rmdirs) 1317 $(call cmd,rmfiles) 1318 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1319 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \ 1320 -o -name '*.ko.*' \ 1321 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1322 -o -name '*.symtypes' -o -name 'modules.order' \ 1323 -o -name modules.builtin -o -name '.tmp_*.o.*' \ 1324 -o -name '*.gcno' \) -type f -print | xargs rm -f 1325 1326# Generate tags for editors 1327# --------------------------------------------------------------------------- 1328quiet_cmd_tags = GEN $@ 1329 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@ 1330 1331tags TAGS cscope gtags: FORCE 1332 $(call cmd,tags) 1333 1334# Scripts to check various things for consistency 1335# --------------------------------------------------------------------------- 1336 1337PHONY += includecheck versioncheck coccicheck namespacecheck export_report 1338 1339includecheck: 1340 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1341 -name '*.[hcS]' -type f -print | sort \ 1342 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1343 1344versioncheck: 1345 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1346 -name '*.[hcS]' -type f -print | sort \ 1347 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1348 1349coccicheck: 1350 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@ 1351 1352namespacecheck: 1353 $(PERL) $(srctree)/scripts/namespace.pl 1354 1355export_report: 1356 $(PERL) $(srctree)/scripts/export_report.pl 1357 1358endif #ifeq ($(config-targets),1) 1359endif #ifeq ($(mixed-targets),1) 1360 1361PHONY += checkstack kernelrelease kernelversion image_name 1362 1363# UML needs a little special treatment here. It wants to use the host 1364# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1365# else wants $(ARCH), including people doing cross-builds, which means 1366# that $(SUBARCH) doesn't work here. 1367ifeq ($(ARCH), um) 1368CHECKSTACK_ARCH := $(SUBARCH) 1369else 1370CHECKSTACK_ARCH := $(ARCH) 1371endif 1372checkstack: 1373 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1374 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1375 1376kernelrelease: 1377 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1378 1379kernelversion: 1380 @echo $(KERNELVERSION) 1381 1382image_name: 1383 @echo $(KBUILD_IMAGE) 1384 1385# Clear a bunch of variables before executing the submake 1386tools/: FORCE 1387 $(Q)mkdir -p $(objtree)/tools 1388 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/ 1389 1390tools/%: FORCE 1391 $(Q)mkdir -p $(objtree)/tools 1392 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/ $* 1393 1394# Single targets 1395# --------------------------------------------------------------------------- 1396# Single targets are compatible with: 1397# - build with mixed source and output 1398# - build with separate output dir 'make O=...' 1399# - external modules 1400# 1401# target-dir => where to store outputfile 1402# build-dir => directory in kernel source tree to use 1403 1404ifeq ($(KBUILD_EXTMOD),) 1405 build-dir = $(patsubst %/,%,$(dir $@)) 1406 target-dir = $(dir $@) 1407else 1408 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@))) 1409 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash)) 1410 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@)) 1411endif 1412 1413%.s: %.c prepare scripts FORCE 1414 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1415%.i: %.c prepare scripts FORCE 1416 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1417%.o: %.c prepare scripts FORCE 1418 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1419%.lst: %.c prepare scripts FORCE 1420 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1421%.s: %.S prepare scripts FORCE 1422 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1423%.o: %.S prepare scripts FORCE 1424 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1425%.symtypes: %.c prepare scripts FORCE 1426 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1427 1428# Modules 1429/: prepare scripts FORCE 1430 $(cmd_crmodverdir) 1431 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1432 $(build)=$(build-dir) 1433%/: prepare scripts FORCE 1434 $(cmd_crmodverdir) 1435 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1436 $(build)=$(build-dir) 1437%.ko: prepare scripts FORCE 1438 $(cmd_crmodverdir) 1439 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1440 $(build)=$(build-dir) $(@:.ko=.o) 1441 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1442 1443# FIXME Should go into a make.lib or something 1444# =========================================================================== 1445 1446quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs))) 1447 cmd_rmdirs = rm -rf $(rm-dirs) 1448 1449quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1450 cmd_rmfiles = rm -f $(rm-files) 1451 1452# Run depmod only if we have System.map and depmod is executable 1453quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) 1454 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1455 $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))" 1456 1457# Create temporary dir for module support files 1458# clean it up only when building all modules 1459cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \ 1460 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*) 1461 1462# read all saved command lines 1463 1464targets := $(wildcard $(sort $(targets))) 1465cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd)) 1466 1467ifneq ($(cmd_files),) 1468 $(cmd_files): ; # Do not try to update included dependency files 1469 include $(cmd_files) 1470endif 1471 1472# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir 1473# Usage: 1474# $(Q)$(MAKE) $(clean)=dir 1475clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj 1476 1477endif # skip-makefile 1478 1479PHONY += FORCE 1480FORCE: 1481 1482# Declare the contents of the .PHONY variable as phony. We keep that 1483# information in a variable so we can use it in if_changed and friends. 1484.PHONY: $(PHONY) 1485