1VERSION = 3 2PATCHLEVEL = 14 3SUBLEVEL = 4 4EXTRAVERSION = 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 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_REGULAR: \ 609 -fstack-protector not supported by compiler) 610 endif 611else 612ifdef CONFIG_CC_STACKPROTECTOR_STRONG 613 stackp-flag := -fstack-protector-strong 614 ifeq ($(call cc-option, $(stackp-flag)),) 615 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: \ 616 -fstack-protector-strong not supported by compiler) 617 endif 618else 619 # Force off for distro compilers that enable stack protector by default. 620 stackp-flag := $(call cc-option, -fno-stack-protector) 621endif 622endif 623KBUILD_CFLAGS += $(stackp-flag) 624 625# This warning generated too much noise in a regular build. 626# Use make W=1 to enable this warning (see scripts/Makefile.build) 627KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable) 628 629ifdef CONFIG_FRAME_POINTER 630KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 631else 632# Some targets (ARM with Thumb2, for example), can't be built with frame 633# pointers. For those, we don't have FUNCTION_TRACER automatically 634# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 635# incompatible with -fomit-frame-pointer with current GCC, so we don't use 636# -fomit-frame-pointer with FUNCTION_TRACER. 637ifndef CONFIG_FUNCTION_TRACER 638KBUILD_CFLAGS += -fomit-frame-pointer 639endif 640endif 641 642ifdef CONFIG_DEBUG_INFO 643KBUILD_CFLAGS += -g 644KBUILD_AFLAGS += -Wa,--gdwarf-2 645endif 646 647ifdef CONFIG_DEBUG_INFO_REDUCED 648KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \ 649 $(call cc-option,-fno-var-tracking) 650endif 651 652ifdef CONFIG_FUNCTION_TRACER 653ifdef CONFIG_HAVE_FENTRY 654CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY) 655endif 656KBUILD_CFLAGS += -pg $(CC_USING_FENTRY) 657KBUILD_AFLAGS += $(CC_USING_FENTRY) 658ifdef CONFIG_DYNAMIC_FTRACE 659 ifdef CONFIG_HAVE_C_RECORDMCOUNT 660 BUILD_C_RECORDMCOUNT := y 661 export BUILD_C_RECORDMCOUNT 662 endif 663endif 664endif 665 666# We trigger additional mismatches with less inlining 667ifdef CONFIG_DEBUG_SECTION_MISMATCH 668KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) 669endif 670 671# arch Makefile may override CC so keep this after arch Makefile is included 672NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) 673CHECKFLAGS += $(NOSTDINC_FLAGS) 674 675# warn about C99 declaration after statement 676KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,) 677 678# disable pointer signed / unsigned warnings in gcc 4.0 679KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign) 680 681# disable invalid "can't wrap" optimizations for signed / pointers 682KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow) 683 684# conserve stack if available 685KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) 686 687# disallow errors like 'EXPORT_GPL(foo);' with missing header 688KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int) 689 690# require functions to have arguments in prototypes, not empty 'int foo()' 691KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes) 692 693# Prohibit date/time macros, which would make the build non-deterministic 694KBUILD_CFLAGS += $(call cc-option,-Werror=date-time) 695 696# use the deterministic mode of AR if available 697KBUILD_ARFLAGS := $(call ar-option,D) 698 699# check for 'asm goto' 700ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y) 701 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO 702endif 703 704# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments 705KBUILD_CPPFLAGS += $(KCPPFLAGS) 706KBUILD_AFLAGS += $(KAFLAGS) 707KBUILD_CFLAGS += $(KCFLAGS) 708 709# Use --build-id when available. 710LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\ 711 $(call cc-ldoption, -Wl$(comma)--build-id,)) 712KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID) 713LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID) 714 715ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 716LDFLAGS_vmlinux += $(call ld-option, -X,) 717endif 718 719# Default kernel image to build when no specific target is given. 720# KBUILD_IMAGE may be overruled on the command line or 721# set in the environment 722# Also any assignments in arch/$(ARCH)/Makefile take precedence over 723# this default value 724export KBUILD_IMAGE ?= vmlinux 725 726# 727# INSTALL_PATH specifies where to place the updated kernel and system map 728# images. Default is /boot, but you can set it to other values 729export INSTALL_PATH ?= /boot 730 731# 732# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 733# relocations required by build roots. This is not defined in the 734# makefile but the argument can be passed to make if needed. 735# 736 737MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 738export MODLIB 739 740# 741# INSTALL_MOD_STRIP, if defined, will cause modules to be 742# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then 743# the default option --strip-debug will be used. Otherwise, 744# INSTALL_MOD_STRIP value will be used as the options to the strip command. 745 746ifdef INSTALL_MOD_STRIP 747ifeq ($(INSTALL_MOD_STRIP),1) 748mod_strip_cmd = $(STRIP) --strip-debug 749else 750mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP) 751endif # INSTALL_MOD_STRIP=1 752else 753mod_strip_cmd = true 754endif # INSTALL_MOD_STRIP 755export mod_strip_cmd 756 757# Select initial ramdisk compression format, default is gzip(1). 758# This shall be used by the dracut(8) tool while creating an initramfs image. 759# 760INITRD_COMPRESS-y := gzip 761INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2 762INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma 763INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz 764INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo 765INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4 766# do not export INITRD_COMPRESS, since we didn't actually 767# choose a sane default compression above. 768# export INITRD_COMPRESS := $(INITRD_COMPRESS-y) 769 770ifdef CONFIG_MODULE_SIG_ALL 771MODSECKEY = ./signing_key.priv 772MODPUBKEY = ./signing_key.x509 773export MODPUBKEY 774mod_sign_cmd = perl $(srctree)/scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODSECKEY) $(MODPUBKEY) 775else 776mod_sign_cmd = true 777endif 778export mod_sign_cmd 779 780 781ifeq ($(KBUILD_EXTMOD),) 782core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/ 783 784vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \ 785 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 786 $(net-y) $(net-m) $(libs-y) $(libs-m))) 787 788vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \ 789 $(init-n) $(init-) \ 790 $(core-n) $(core-) $(drivers-n) $(drivers-) \ 791 $(net-n) $(net-) $(libs-n) $(libs-)))) 792 793init-y := $(patsubst %/, %/built-in.o, $(init-y)) 794core-y := $(patsubst %/, %/built-in.o, $(core-y)) 795drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y)) 796net-y := $(patsubst %/, %/built-in.o, $(net-y)) 797libs-y1 := $(patsubst %/, %/lib.a, $(libs-y)) 798libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y)) 799libs-y := $(libs-y1) $(libs-y2) 800 801# Externally visible symbols (used by link-vmlinux.sh) 802export KBUILD_VMLINUX_INIT := $(head-y) $(init-y) 803export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y) 804export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 805export LDFLAGS_vmlinux 806# used by scripts/pacmage/Makefile 807export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools virt) 808 809vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) 810 811# Final link of vmlinux 812 cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) 813quiet_cmd_link-vmlinux = LINK $@ 814 815# Include targets which we want to 816# execute if the rest of the kernel build went well. 817vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE 818ifdef CONFIG_HEADERS_CHECK 819 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check 820endif 821ifdef CONFIG_SAMPLES 822 $(Q)$(MAKE) $(build)=samples 823endif 824ifdef CONFIG_BUILD_DOCSRC 825 $(Q)$(MAKE) $(build)=Documentation 826endif 827 +$(call if_changed,link-vmlinux) 828 829# The actual objects are generated when descending, 830# make sure no implicit rule kicks in 831$(sort $(vmlinux-deps)): $(vmlinux-dirs) ; 832 833# Handle descending into subdirectories listed in $(vmlinux-dirs) 834# Preset locale variables to speed up the build process. Limit locale 835# tweaks to this spot to avoid wrong language settings when running 836# make menuconfig etc. 837# Error messages still appears in the original language 838 839PHONY += $(vmlinux-dirs) 840$(vmlinux-dirs): prepare scripts 841 $(Q)$(MAKE) $(build)=$@ 842 843define filechk_kernel.release 844 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 845endef 846 847# Store (new) KERNELRELEASE string in include/config/kernel.release 848include/config/kernel.release: include/config/auto.conf FORCE 849 $(call filechk,kernel.release) 850 851 852# Things we need to do before we recursively start building the kernel 853# or the modules are listed in "prepare". 854# A multi level approach is used. prepareN is processed before prepareN-1. 855# archprepare is used in arch Makefiles and when processed asm symlink, 856# version.h and scripts_basic is processed / created. 857 858# Listed in dependency order 859PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3 860 861# prepare3 is used to check if we are building in a separate output directory, 862# and if so do: 863# 1) Check that make has not been executed in the kernel src $(srctree) 864prepare3: include/config/kernel.release 865ifneq ($(KBUILD_SRC),) 866 @$(kecho) ' Using $(srctree) as source for kernel' 867 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \ 868 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \ 869 echo >&2 " in the '$(srctree)' directory.";\ 870 /bin/false; \ 871 fi; 872endif 873 874# prepare2 creates a makefile if using a separate output directory 875prepare2: prepare3 outputmakefile asm-generic 876 877prepare1: prepare2 $(version_h) include/generated/utsrelease.h \ 878 include/config/auto.conf 879 $(cmd_crmodverdir) 880 881archprepare: archheaders archscripts prepare1 scripts_basic 882 883prepare0: archprepare FORCE 884 $(Q)$(MAKE) $(build)=. 885 886# All the preparing.. 887prepare: prepare0 888 889# Generate some files 890# --------------------------------------------------------------------------- 891 892# KERNELRELEASE can change from a few different places, meaning version.h 893# needs to be updated, so this check is forced on all builds 894 895uts_len := 64 896define filechk_utsrelease.h 897 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 898 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 899 exit 1; \ 900 fi; \ 901 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";) 902endef 903 904define filechk_version.h 905 (echo \#define LINUX_VERSION_CODE $(shell \ 906 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \ 907 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';) 908endef 909 910$(version_h): $(srctree)/Makefile FORCE 911 $(call filechk,version.h) 912 913include/generated/utsrelease.h: include/config/kernel.release FORCE 914 $(call filechk,utsrelease.h) 915 916PHONY += headerdep 917headerdep: 918 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 919 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 920 921# --------------------------------------------------------------------------- 922 923PHONY += depend dep 924depend dep: 925 @echo '*** Warning: make $@ is unnecessary now.' 926 927# --------------------------------------------------------------------------- 928# Firmware install 929INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware 930export INSTALL_FW_PATH 931 932PHONY += firmware_install 933firmware_install: FORCE 934 @mkdir -p $(objtree)/firmware 935 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install 936 937# --------------------------------------------------------------------------- 938# Kernel headers 939 940#Default location for installed headers 941export INSTALL_HDR_PATH = $(objtree)/usr 942 943hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj 944 945# If we do an all arch process set dst to asm-$(hdr-arch) 946hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm) 947 948PHONY += archheaders 949archheaders: 950 951PHONY += archscripts 952archscripts: 953 954PHONY += __headers 955__headers: $(version_h) scripts_basic asm-generic archheaders archscripts FORCE 956 $(Q)$(MAKE) $(build)=scripts build_unifdef 957 958PHONY += headers_install_all 959headers_install_all: 960 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install 961 962PHONY += headers_install 963headers_install: __headers 964 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \ 965 $(error Headers not exportable for the $(SRCARCH) architecture)) 966 $(Q)$(MAKE) $(hdr-inst)=include/uapi 967 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) 968 969PHONY += headers_check_all 970headers_check_all: headers_install_all 971 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check 972 973PHONY += headers_check 974headers_check: headers_install 975 $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1 976 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1 977 978# --------------------------------------------------------------------------- 979# Modules 980 981ifdef CONFIG_MODULES 982 983# By default, build modules as well 984 985all: modules 986 987# Build modules 988# 989# A module can be listed more than once in obj-m resulting in 990# duplicate lines in modules.order files. Those are removed 991# using awk while concatenating to the final file. 992 993PHONY += modules 994modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin 995 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order 996 @$(kecho) ' Building modules, stage 2.'; 997 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 998 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild 999 1000modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1001 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin 1002 1003%/modules.builtin: include/config/auto.conf 1004 $(Q)$(MAKE) $(modbuiltin)=$* 1005 1006 1007# Target to prepare building external modules 1008PHONY += modules_prepare 1009modules_prepare: prepare scripts 1010 1011# Target to install modules 1012PHONY += modules_install 1013modules_install: _modinst_ _modinst_post 1014 1015PHONY += _modinst_ 1016_modinst_: 1017 @rm -rf $(MODLIB)/kernel 1018 @rm -f $(MODLIB)/source 1019 @mkdir -p $(MODLIB)/kernel 1020 @ln -s $(srctree) $(MODLIB)/source 1021 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1022 rm -f $(MODLIB)/build ; \ 1023 ln -s $(objtree) $(MODLIB)/build ; \ 1024 fi 1025 @cp -f $(objtree)/modules.order $(MODLIB)/ 1026 @cp -f $(objtree)/modules.builtin $(MODLIB)/ 1027 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1028 1029# This depmod is only for convenience to give the initial 1030# boot a modules.dep even before / is mounted read-write. However the 1031# boot script depmod is the master version. 1032PHONY += _modinst_post 1033_modinst_post: _modinst_ 1034 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst 1035 $(call cmd,depmod) 1036 1037ifeq ($(CONFIG_MODULE_SIG), y) 1038PHONY += modules_sign 1039modules_sign: 1040 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign 1041endif 1042 1043else # CONFIG_MODULES 1044 1045# Modules not configured 1046# --------------------------------------------------------------------------- 1047 1048modules modules_install: FORCE 1049 @echo >&2 1050 @echo >&2 "The present kernel configuration has modules disabled." 1051 @echo >&2 "Type 'make config' and enable loadable module support." 1052 @echo >&2 "Then build a kernel with module support enabled." 1053 @echo >&2 1054 @exit 1 1055 1056endif # CONFIG_MODULES 1057 1058### 1059# Cleaning is done on three levels. 1060# make clean Delete most generated files 1061# Leave enough to build external modules 1062# make mrproper Delete the current configuration, and all generated files 1063# make distclean Remove editor backup files, patch leftover files and the like 1064 1065# Directories & files removed with 'make clean' 1066CLEAN_DIRS += $(MODVERDIR) 1067 1068# Directories & files removed with 'make mrproper' 1069MRPROPER_DIRS += include/config usr/include include/generated \ 1070 arch/*/include/generated 1071MRPROPER_FILES += .config .config.old .version .old_version $(version_h) \ 1072 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \ 1073 signing_key.priv signing_key.x509 x509.genkey \ 1074 extra_certificates signing_key.x509.keyid \ 1075 signing_key.x509.signer 1076 1077# clean - Delete most, but leave enough to build external modules 1078# 1079clean: rm-dirs := $(CLEAN_DIRS) 1080clean: rm-files := $(CLEAN_FILES) 1081clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples) 1082 1083PHONY += $(clean-dirs) clean archclean vmlinuxclean 1084$(clean-dirs): 1085 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1086 1087vmlinuxclean: 1088 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1089 1090clean: archclean vmlinuxclean 1091 1092# mrproper - Delete all generated files, including .config 1093# 1094mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS)) 1095mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1096mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts) 1097 1098PHONY += $(mrproper-dirs) mrproper archmrproper 1099$(mrproper-dirs): 1100 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1101 1102mrproper: clean archmrproper $(mrproper-dirs) 1103 $(call cmd,rmdirs) 1104 $(call cmd,rmfiles) 1105 1106# distclean 1107# 1108PHONY += distclean 1109 1110distclean: mrproper 1111 @find $(srctree) $(RCS_FIND_IGNORE) \ 1112 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1113 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \ 1114 -o -name '.*.rej' \ 1115 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \ 1116 -type f -print | xargs rm -f 1117 1118 1119# Packaging of the kernel to various formats 1120# --------------------------------------------------------------------------- 1121# rpm target kept for backward compatibility 1122package-dir := $(srctree)/scripts/package 1123 1124%src-pkg: FORCE 1125 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1126%pkg: include/config/kernel.release FORCE 1127 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1128rpm: include/config/kernel.release FORCE 1129 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1130 1131 1132# Brief documentation of the typical targets used 1133# --------------------------------------------------------------------------- 1134 1135boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1136boards := $(notdir $(boards)) 1137board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1138board-dirs := $(sort $(notdir $(board-dirs:/=))) 1139 1140help: 1141 @echo 'Cleaning targets:' 1142 @echo ' clean - Remove most generated files but keep the config and' 1143 @echo ' enough build support to build external modules' 1144 @echo ' mrproper - Remove all generated files + config + various backup files' 1145 @echo ' distclean - mrproper + remove editor backup and patch files' 1146 @echo '' 1147 @echo 'Configuration targets:' 1148 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1149 @echo '' 1150 @echo 'Other generic targets:' 1151 @echo ' all - Build all targets marked with [*]' 1152 @echo '* vmlinux - Build the bare kernel' 1153 @echo '* modules - Build all modules' 1154 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1155 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH' 1156 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)' 1157 @echo ' dir/ - Build all files in dir and below' 1158 @echo ' dir/file.[oisS] - Build specified target only' 1159 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1160 @echo ' (requires a recent binutils and recent build (System.map))' 1161 @echo ' dir/file.ko - Build module including final link' 1162 @echo ' modules_prepare - Set up for building external modules' 1163 @echo ' tags/TAGS - Generate tags file for editors' 1164 @echo ' cscope - Generate cscope index' 1165 @echo ' gtags - Generate GNU GLOBAL index' 1166 @echo ' kernelrelease - Output the release version string' 1167 @echo ' kernelversion - Output the version stored in Makefile' 1168 @echo ' image_name - Output the image name' 1169 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1170 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1171 echo '' 1172 @echo 'Static analysers' 1173 @echo ' checkstack - Generate a list of stack hogs' 1174 @echo ' namespacecheck - Name space analysis on compiled kernel' 1175 @echo ' versioncheck - Sanity check on version.h usage' 1176 @echo ' includecheck - Check for duplicate included header files' 1177 @echo ' export_report - List the usages of all exported symbols' 1178 @echo ' headers_check - Sanity check on exported headers' 1179 @echo ' headerdep - Detect inclusion cycles in headers' 1180 @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help 1181 @echo '' 1182 @echo 'Kernel packaging:' 1183 @$(MAKE) $(build)=$(package-dir) help 1184 @echo '' 1185 @echo 'Documentation targets:' 1186 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp 1187 @echo '' 1188 @echo 'Architecture specific targets ($(SRCARCH)):' 1189 @$(if $(archhelp),$(archhelp),\ 1190 echo ' No architecture specific help defined for $(SRCARCH)') 1191 @echo '' 1192 @$(if $(boards), \ 1193 $(foreach b, $(boards), \ 1194 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1195 echo '') 1196 @$(if $(board-dirs), \ 1197 $(foreach b, $(board-dirs), \ 1198 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1199 printf " %-16s - Show all of the above\\n" help-boards; \ 1200 echo '') 1201 1202 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1203 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1204 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1205 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)' 1206 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1207 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1208 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where' 1209 @echo ' 1: warnings which may be relevant and do not occur too often' 1210 @echo ' 2: warnings which occur quite often but may still be relevant' 1211 @echo ' 3: more obscure warnings, can most likely be ignored' 1212 @echo ' Multiple levels can be combined with W=12 or W=123' 1213 @echo '' 1214 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1215 @echo 'For further info see the ./README file' 1216 1217 1218help-board-dirs := $(addprefix help-,$(board-dirs)) 1219 1220help-boards: $(help-board-dirs) 1221 1222boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)) 1223 1224$(help-board-dirs): help-%: 1225 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1226 @$(if $(boards-per-dir), \ 1227 $(foreach b, $(boards-per-dir), \ 1228 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1229 echo '') 1230 1231 1232# Documentation targets 1233# --------------------------------------------------------------------------- 1234%docs: scripts_basic FORCE 1235 $(Q)$(MAKE) $(build)=scripts build_docproc 1236 $(Q)$(MAKE) $(build)=Documentation/DocBook $@ 1237 1238else # KBUILD_EXTMOD 1239 1240### 1241# External module support. 1242# When building external modules the kernel used as basis is considered 1243# read-only, and no consistency checks are made and the make 1244# system is not used on the basis kernel. If updates are required 1245# in the basis kernel ordinary make commands (without M=...) must 1246# be used. 1247# 1248# The following are the only valid targets when building external 1249# modules. 1250# make M=dir clean Delete all automatically generated files 1251# make M=dir modules Make all modules in specified dir 1252# make M=dir Same as 'make M=dir modules' 1253# make M=dir modules_install 1254# Install the modules built in the module directory 1255# Assumes install directory is already created 1256 1257# We are always building modules 1258KBUILD_MODULES := 1 1259PHONY += crmodverdir 1260crmodverdir: 1261 $(cmd_crmodverdir) 1262 1263PHONY += $(objtree)/Module.symvers 1264$(objtree)/Module.symvers: 1265 @test -e $(objtree)/Module.symvers || ( \ 1266 echo; \ 1267 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \ 1268 echo " is missing; modules will have no dependencies and modversions."; \ 1269 echo ) 1270 1271module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD)) 1272PHONY += $(module-dirs) modules 1273$(module-dirs): crmodverdir $(objtree)/Module.symvers 1274 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@) 1275 1276modules: $(module-dirs) 1277 @$(kecho) ' Building modules, stage 2.'; 1278 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1279 1280PHONY += modules_install 1281modules_install: _emodinst_ _emodinst_post 1282 1283install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra) 1284PHONY += _emodinst_ 1285_emodinst_: 1286 $(Q)mkdir -p $(MODLIB)/$(install-dir) 1287 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1288 1289PHONY += _emodinst_post 1290_emodinst_post: _emodinst_ 1291 $(call cmd,depmod) 1292 1293clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD)) 1294 1295PHONY += $(clean-dirs) clean 1296$(clean-dirs): 1297 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1298 1299clean: rm-dirs := $(MODVERDIR) 1300clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers 1301 1302help: 1303 @echo ' Building external modules.' 1304 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1305 @echo '' 1306 @echo ' modules - default target, build the module(s)' 1307 @echo ' modules_install - install the module' 1308 @echo ' clean - remove generated files in module directory only' 1309 @echo '' 1310 1311# Dummies... 1312PHONY += prepare scripts 1313prepare: ; 1314scripts: ; 1315endif # KBUILD_EXTMOD 1316 1317clean: $(clean-dirs) 1318 $(call cmd,rmdirs) 1319 $(call cmd,rmfiles) 1320 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1321 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \ 1322 -o -name '*.ko.*' \ 1323 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1324 -o -name '*.symtypes' -o -name 'modules.order' \ 1325 -o -name modules.builtin -o -name '.tmp_*.o.*' \ 1326 -o -name '*.gcno' \) -type f -print | xargs rm -f 1327 1328# Generate tags for editors 1329# --------------------------------------------------------------------------- 1330quiet_cmd_tags = GEN $@ 1331 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@ 1332 1333tags TAGS cscope gtags: FORCE 1334 $(call cmd,tags) 1335 1336# Scripts to check various things for consistency 1337# --------------------------------------------------------------------------- 1338 1339PHONY += includecheck versioncheck coccicheck namespacecheck export_report 1340 1341includecheck: 1342 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1343 -name '*.[hcS]' -type f -print | sort \ 1344 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1345 1346versioncheck: 1347 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1348 -name '*.[hcS]' -type f -print | sort \ 1349 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1350 1351coccicheck: 1352 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@ 1353 1354namespacecheck: 1355 $(PERL) $(srctree)/scripts/namespace.pl 1356 1357export_report: 1358 $(PERL) $(srctree)/scripts/export_report.pl 1359 1360endif #ifeq ($(config-targets),1) 1361endif #ifeq ($(mixed-targets),1) 1362 1363PHONY += checkstack kernelrelease kernelversion image_name 1364 1365# UML needs a little special treatment here. It wants to use the host 1366# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1367# else wants $(ARCH), including people doing cross-builds, which means 1368# that $(SUBARCH) doesn't work here. 1369ifeq ($(ARCH), um) 1370CHECKSTACK_ARCH := $(SUBARCH) 1371else 1372CHECKSTACK_ARCH := $(ARCH) 1373endif 1374checkstack: 1375 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1376 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1377 1378kernelrelease: 1379 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1380 1381kernelversion: 1382 @echo $(KERNELVERSION) 1383 1384image_name: 1385 @echo $(KBUILD_IMAGE) 1386 1387# Clear a bunch of variables before executing the submake 1388tools/: FORCE 1389 $(Q)mkdir -p $(objtree)/tools 1390 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/ 1391 1392tools/%: FORCE 1393 $(Q)mkdir -p $(objtree)/tools 1394 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/ $* 1395 1396# Single targets 1397# --------------------------------------------------------------------------- 1398# Single targets are compatible with: 1399# - build with mixed source and output 1400# - build with separate output dir 'make O=...' 1401# - external modules 1402# 1403# target-dir => where to store outputfile 1404# build-dir => directory in kernel source tree to use 1405 1406ifeq ($(KBUILD_EXTMOD),) 1407 build-dir = $(patsubst %/,%,$(dir $@)) 1408 target-dir = $(dir $@) 1409else 1410 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@))) 1411 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash)) 1412 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@)) 1413endif 1414 1415%.s: %.c prepare scripts FORCE 1416 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1417%.i: %.c prepare scripts FORCE 1418 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1419%.o: %.c prepare scripts FORCE 1420 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1421%.lst: %.c prepare scripts FORCE 1422 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1423%.s: %.S prepare scripts FORCE 1424 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1425%.o: %.S prepare scripts FORCE 1426 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1427%.symtypes: %.c prepare scripts FORCE 1428 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1429 1430# Modules 1431/: prepare scripts FORCE 1432 $(cmd_crmodverdir) 1433 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1434 $(build)=$(build-dir) 1435%/: prepare scripts FORCE 1436 $(cmd_crmodverdir) 1437 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1438 $(build)=$(build-dir) 1439%.ko: prepare scripts FORCE 1440 $(cmd_crmodverdir) 1441 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1442 $(build)=$(build-dir) $(@:.ko=.o) 1443 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1444 1445# FIXME Should go into a make.lib or something 1446# =========================================================================== 1447 1448quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs))) 1449 cmd_rmdirs = rm -rf $(rm-dirs) 1450 1451quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1452 cmd_rmfiles = rm -f $(rm-files) 1453 1454# Run depmod only if we have System.map and depmod is executable 1455quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) 1456 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1457 $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))" 1458 1459# Create temporary dir for module support files 1460# clean it up only when building all modules 1461cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \ 1462 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*) 1463 1464# read all saved command lines 1465 1466targets := $(wildcard $(sort $(targets))) 1467cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd)) 1468 1469ifneq ($(cmd_files),) 1470 $(cmd_files): ; # Do not try to update included dependency files 1471 include $(cmd_files) 1472endif 1473 1474# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir 1475# Usage: 1476# $(Q)$(MAKE) $(clean)=dir 1477clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj 1478 1479endif # skip-makefile 1480 1481PHONY += FORCE 1482FORCE: 1483 1484# Declare the contents of the .PHONY variable as phony. We keep that 1485# information in a variable so we can use it in if_changed and friends. 1486.PHONY: $(PHONY) 1487