1VERSION = 3 2PATCHLEVEL = 16 3SUBLEVEL = 0 4EXTRAVERSION = -rc5 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# Beautify output 45# --------------------------------------------------------------------------- 46# 47# Normally, we echo the whole command before executing it. By making 48# that echo $($(quiet)$(cmd)), we now have the possibility to set 49# $(quiet) to choose other forms of output instead, e.g. 50# 51# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@ 52# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< 53# 54# If $(quiet) is empty, the whole command will be printed. 55# If it is set to "quiet_", only the short version will be printed. 56# If it is set to "silent_", nothing will be printed at all, since 57# the variable $(silent_cmd_cc_o_c) doesn't exist. 58# 59# A simple variant is to prefix commands with $(Q) - that's useful 60# for commands that shall be hidden in non-verbose mode. 61# 62# $(Q)ln $@ :< 63# 64# If KBUILD_VERBOSE equals 0 then the above command will be hidden. 65# If KBUILD_VERBOSE equals 1 then the above command is displayed. 66# 67# To put more focus on warnings, be less verbose as default 68# Use 'make V=1' to see the full commands 69 70ifeq ("$(origin V)", "command line") 71 KBUILD_VERBOSE = $(V) 72endif 73ifndef KBUILD_VERBOSE 74 KBUILD_VERBOSE = 0 75endif 76 77ifeq ($(KBUILD_VERBOSE),1) 78 quiet = 79 Q = 80else 81 quiet=quiet_ 82 Q = @ 83endif 84 85# If the user is running make -s (silent mode), suppress echoing of 86# commands 87 88ifneq ($(filter 4.%,$(MAKE_VERSION)),) # make-4 89ifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),) 90 quiet=silent_ 91endif 92else # make-3.8x 93ifneq ($(filter s% -s%,$(MAKEFLAGS)),) 94 quiet=silent_ 95endif 96endif 97 98export quiet Q KBUILD_VERBOSE 99 100# Call a source code checker (by default, "sparse") as part of the 101# C compilation. 102# 103# Use 'make C=1' to enable checking of only re-compiled files. 104# Use 'make C=2' to enable checking of *all* source files, regardless 105# of whether they are re-compiled or not. 106# 107# See the file "Documentation/sparse.txt" for more details, including 108# where to get the "sparse" utility. 109 110ifeq ("$(origin C)", "command line") 111 KBUILD_CHECKSRC = $(C) 112endif 113ifndef KBUILD_CHECKSRC 114 KBUILD_CHECKSRC = 0 115endif 116 117# Use make M=dir to specify directory of external module to build 118# Old syntax make ... SUBDIRS=$PWD is still supported 119# Setting the environment variable KBUILD_EXTMOD take precedence 120ifdef SUBDIRS 121 KBUILD_EXTMOD ?= $(SUBDIRS) 122endif 123 124ifeq ("$(origin M)", "command line") 125 KBUILD_EXTMOD := $(M) 126endif 127 128# kbuild supports saving output files in a separate directory. 129# To locate output files in a separate directory two syntaxes are supported. 130# In both cases the working directory must be the root of the kernel src. 131# 1) O= 132# Use "make O=dir/to/store/output/files/" 133# 134# 2) Set KBUILD_OUTPUT 135# Set the environment variable KBUILD_OUTPUT to point to the directory 136# where the output files shall be placed. 137# export KBUILD_OUTPUT=dir/to/store/output/files/ 138# make 139# 140# The O= assignment takes precedence over the KBUILD_OUTPUT environment 141# variable. 142 143 144# KBUILD_SRC is set on invocation of make in OBJ directory 145# KBUILD_SRC is not intended to be used by the regular user (for now) 146ifeq ($(KBUILD_SRC),) 147 148# OK, Make called in directory where kernel src resides 149# Do we want to locate output files in a separate directory? 150ifeq ("$(origin O)", "command line") 151 KBUILD_OUTPUT := $(O) 152endif 153 154# That's our default target when none is given on the command line 155PHONY := _all 156_all: 157 158# Cancel implicit rules on top Makefile 159$(CURDIR)/Makefile Makefile: ; 160 161ifneq ($(KBUILD_OUTPUT),) 162# Invoke a second make in the output directory, passing relevant variables 163# check that the output directory actually exists 164saved-output := $(KBUILD_OUTPUT) 165KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \ 166 && /bin/pwd) 167$(if $(KBUILD_OUTPUT),, \ 168 $(error failed to create output directory "$(saved-output)")) 169 170PHONY += $(MAKECMDGOALS) sub-make 171 172$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make 173 @: 174 175# Fake the "Entering directory" message once, so that IDEs/editors are 176# able to understand relative filenames. 177 echodir := @echo 178 quiet_echodir := @echo 179silent_echodir := @: 180sub-make: FORCE 181 $($(quiet)echodir) "make[1]: Entering directory \`$(KBUILD_OUTPUT)'" 182 $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \ 183 KBUILD_SRC=$(CURDIR) \ 184 KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \ 185 $(filter-out _all sub-make,$(MAKECMDGOALS)) 186 187# Leave processing to above invocation of make 188skip-makefile := 1 189endif # ifneq ($(KBUILD_OUTPUT),) 190endif # ifeq ($(KBUILD_SRC),) 191 192# We process the rest of the Makefile if this is the final invocation of make 193ifeq ($(skip-makefile),) 194 195# If building an external module we do not care about the all: rule 196# but instead _all depend on modules 197PHONY += all 198ifeq ($(KBUILD_EXTMOD),) 199_all: all 200else 201_all: modules 202endif 203 204ifeq ($(KBUILD_SRC),) 205 # building in the source tree 206 srctree := . 207else 208 ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR))) 209 # building in a subdirectory of the source tree 210 srctree := .. 211 else 212 srctree := $(KBUILD_SRC) 213 endif 214endif 215objtree := . 216src := $(srctree) 217obj := $(objtree) 218 219VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD)) 220 221export srctree objtree VPATH 222 223 224# SUBARCH tells the usermode build what the underlying arch is. That is set 225# first, and if a usermode build is happening, the "ARCH=um" on the command 226# line overrides the setting of ARCH below. If a native build is happening, 227# then ARCH is assigned, getting whatever value it gets normally, and 228# SUBARCH is subsequently ignored. 229 230SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \ 231 -e s/sun4u/sparc64/ \ 232 -e s/arm.*/arm/ -e s/sa110/arm/ \ 233 -e s/s390x/s390/ -e s/parisc64/parisc/ \ 234 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \ 235 -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ ) 236 237# Cross compiling and selecting different set of gcc/bin-utils 238# --------------------------------------------------------------------------- 239# 240# When performing cross compilation for other architectures ARCH shall be set 241# to the target architecture. (See arch/* for the possibilities). 242# ARCH can be set during invocation of make: 243# make ARCH=ia64 244# Another way is to have ARCH set in the environment. 245# The default ARCH is the host where make is executed. 246 247# CROSS_COMPILE specify the prefix used for all executables used 248# during compilation. Only gcc and related bin-utils executables 249# are prefixed with $(CROSS_COMPILE). 250# CROSS_COMPILE can be set on the command line 251# make CROSS_COMPILE=ia64-linux- 252# Alternatively CROSS_COMPILE can be set in the environment. 253# A third alternative is to store a setting in .config so that plain 254# "make" in the configured kernel build directory always uses that. 255# Default value for CROSS_COMPILE is not to prefix executables 256# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 257ARCH ?= $(SUBARCH) 258CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%) 259 260# Architecture as present in compile.h 261UTS_MACHINE := $(ARCH) 262SRCARCH := $(ARCH) 263 264# Additional ARCH settings for x86 265ifeq ($(ARCH),i386) 266 SRCARCH := x86 267endif 268ifeq ($(ARCH),x86_64) 269 SRCARCH := x86 270endif 271 272# Additional ARCH settings for sparc 273ifeq ($(ARCH),sparc32) 274 SRCARCH := sparc 275endif 276ifeq ($(ARCH),sparc64) 277 SRCARCH := sparc 278endif 279 280# Additional ARCH settings for sh 281ifeq ($(ARCH),sh64) 282 SRCARCH := sh 283endif 284 285# Additional ARCH settings for tile 286ifeq ($(ARCH),tilepro) 287 SRCARCH := tile 288endif 289ifeq ($(ARCH),tilegx) 290 SRCARCH := tile 291endif 292 293# Where to locate arch specific headers 294hdr-arch := $(SRCARCH) 295 296KCONFIG_CONFIG ?= .config 297export KCONFIG_CONFIG 298 299# SHELL used by kbuild 300CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \ 301 else if [ -x /bin/bash ]; then echo /bin/bash; \ 302 else echo sh; fi ; fi) 303 304HOSTCC = gcc 305HOSTCXX = g++ 306HOSTCFLAGS = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer 307HOSTCXXFLAGS = -O2 308 309ifeq ($(shell $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1) 310HOSTCFLAGS += -Wno-unused-value -Wno-unused-parameter \ 311 -Wno-missing-field-initializers -fno-delete-null-pointer-checks 312endif 313 314# Decide whether to build built-in, modular, or both. 315# Normally, just do built-in. 316 317KBUILD_MODULES := 318KBUILD_BUILTIN := 1 319 320# If we have only "make modules", don't compile built-in objects. 321# When we're building modules with modversions, we need to consider 322# the built-in objects during the descend as well, in order to 323# make sure the checksums are up to date before we record them. 324 325ifeq ($(MAKECMDGOALS),modules) 326 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1) 327endif 328 329# If we have "make <whatever> modules", compile modules 330# in addition to whatever we do anyway. 331# Just "make" or "make all" shall build modules as well 332 333ifneq ($(filter all _all modules,$(MAKECMDGOALS)),) 334 KBUILD_MODULES := 1 335endif 336 337ifeq ($(MAKECMDGOALS),) 338 KBUILD_MODULES := 1 339endif 340 341export KBUILD_MODULES KBUILD_BUILTIN 342export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD 343 344ifneq ($(CC),) 345ifeq ($(shell $(CC) -v 2>&1 | grep -c "clang version"), 1) 346COMPILER := clang 347else 348COMPILER := gcc 349endif 350export COMPILER 351endif 352 353# Look for make include files relative to root of kernel src 354MAKEFLAGS += --include-dir=$(srctree) 355 356# We need some generic definitions (do not try to remake the file). 357$(srctree)/scripts/Kbuild.include: ; 358include $(srctree)/scripts/Kbuild.include 359 360# Make variables (CC, etc...) 361AS = $(CROSS_COMPILE)as 362LD = $(CROSS_COMPILE)ld 363CC = $(CROSS_COMPILE)gcc 364CPP = $(CC) -E 365AR = $(CROSS_COMPILE)ar 366NM = $(CROSS_COMPILE)nm 367STRIP = $(CROSS_COMPILE)strip 368OBJCOPY = $(CROSS_COMPILE)objcopy 369OBJDUMP = $(CROSS_COMPILE)objdump 370AWK = awk 371GENKSYMS = scripts/genksyms/genksyms 372INSTALLKERNEL := installkernel 373DEPMOD = /sbin/depmod 374PERL = perl 375CHECK = sparse 376 377CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 378 -Wbitwise -Wno-return-void $(CF) 379CFLAGS_MODULE = 380AFLAGS_MODULE = 381LDFLAGS_MODULE = 382CFLAGS_KERNEL = 383AFLAGS_KERNEL = 384CFLAGS_GCOV = -fprofile-arcs -ftest-coverage 385 386 387# Use USERINCLUDE when you must reference the UAPI directories only. 388USERINCLUDE := \ 389 -I$(srctree)/arch/$(hdr-arch)/include/uapi \ 390 -Iarch/$(hdr-arch)/include/generated/uapi \ 391 -I$(srctree)/include/uapi \ 392 -Iinclude/generated/uapi \ 393 -include $(srctree)/include/linux/kconfig.h 394 395# Use LINUXINCLUDE when you must reference the include/ directory. 396# Needed to be compatible with the O= option 397LINUXINCLUDE := \ 398 -I$(srctree)/arch/$(hdr-arch)/include \ 399 -Iarch/$(hdr-arch)/include/generated \ 400 $(if $(KBUILD_SRC), -I$(srctree)/include) \ 401 -Iinclude \ 402 $(USERINCLUDE) 403 404KBUILD_CPPFLAGS := -D__KERNEL__ 405 406KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \ 407 -fno-strict-aliasing -fno-common \ 408 -Werror-implicit-function-declaration \ 409 -Wno-format-security 410 411KBUILD_AFLAGS_KERNEL := 412KBUILD_CFLAGS_KERNEL := 413KBUILD_AFLAGS := -D__ASSEMBLY__ 414KBUILD_AFLAGS_MODULE := -DMODULE 415KBUILD_CFLAGS_MODULE := -DMODULE 416KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds 417 418# Read KERNELRELEASE from include/config/kernel.release (if it exists) 419KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null) 420KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 421 422export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 423export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC 424export CPP AR NM STRIP OBJCOPY OBJDUMP 425export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE 426export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS 427 428export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS 429export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV 430export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 431export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 432export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 433export KBUILD_ARFLAGS 434 435# When compiling out-of-tree modules, put MODVERDIR in the module 436# tree rather than in the kernel tree. The kernel tree might 437# even be read-only. 438export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions 439 440# Files to ignore in find ... statements 441 442export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 443 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 444 -prune -o 445export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 446 --exclude CVS --exclude .pc --exclude .hg --exclude .git 447 448# =========================================================================== 449# Rules shared between *config targets and build targets 450 451# Basic helpers built in scripts/ 452PHONY += scripts_basic 453scripts_basic: 454 $(Q)$(MAKE) $(build)=scripts/basic 455 $(Q)rm -f .tmp_quiet_recordmcount 456 457# To avoid any implicit rule to kick in, define an empty command. 458scripts/basic/%: scripts_basic ; 459 460PHONY += outputmakefile 461# outputmakefile generates a Makefile in the output directory, if using a 462# separate output directory. This allows convenient use of make in the 463# output directory. 464outputmakefile: 465ifneq ($(KBUILD_SRC),) 466 $(Q)ln -fsn $(srctree) source 467 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \ 468 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL) 469endif 470 471# Support for using generic headers in asm-generic 472PHONY += asm-generic 473asm-generic: 474 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \ 475 src=asm obj=arch/$(SRCARCH)/include/generated/asm 476 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \ 477 src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm 478 479# To make sure we do not include .config for any of the *config targets 480# catch them early, and hand them over to scripts/kconfig/Makefile 481# It is allowed to specify more targets when calling make, including 482# mixing *config targets and build targets. 483# For example 'make oldconfig all'. 484# Detect when mixed targets is specified, and make a second invocation 485# of make so .config is not included in this case either (for *config). 486 487version_h := include/generated/uapi/linux/version.h 488 489no-dot-config-targets := clean mrproper distclean \ 490 cscope gtags TAGS tags help %docs check% coccicheck \ 491 $(version_h) headers_% archheaders archscripts \ 492 kernelversion %src-pkg 493 494config-targets := 0 495mixed-targets := 0 496dot-config := 1 497 498ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 499 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 500 dot-config := 0 501 endif 502endif 503 504ifeq ($(KBUILD_EXTMOD),) 505 ifneq ($(filter config %config,$(MAKECMDGOALS)),) 506 config-targets := 1 507 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),) 508 mixed-targets := 1 509 endif 510 endif 511endif 512 513ifeq ($(mixed-targets),1) 514# =========================================================================== 515# We're called with mixed targets (*config and build targets). 516# Handle them one by one. 517 518PHONY += $(MAKECMDGOALS) __build_one_by_one 519 520$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one 521 @: 522 523__build_one_by_one: 524 $(Q)set -e; \ 525 for i in $(MAKECMDGOALS); do \ 526 $(MAKE) -f $(srctree)/Makefile $$i; \ 527 done 528 529else 530ifeq ($(config-targets),1) 531# =========================================================================== 532# *config targets only - make sure prerequisites are updated, and descend 533# in scripts/kconfig to make the *config target 534 535# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 536# KBUILD_DEFCONFIG may point out an alternative default configuration 537# used for 'make defconfig' 538include $(srctree)/arch/$(SRCARCH)/Makefile 539export KBUILD_DEFCONFIG KBUILD_KCONFIG 540 541config: scripts_basic outputmakefile FORCE 542 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 543 544%config: scripts_basic outputmakefile FORCE 545 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 546 547else 548# =========================================================================== 549# Build targets only - this includes vmlinux, arch specific targets, clean 550# targets and others. In general all targets except *config targets. 551 552ifeq ($(KBUILD_EXTMOD),) 553# Additional helpers built in scripts/ 554# Carefully list dependencies so we do not try to build scripts twice 555# in parallel 556PHONY += scripts 557scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \ 558 asm-generic 559 $(Q)$(MAKE) $(build)=$(@) 560 561# Objects we will link into vmlinux / subdirs we need to visit 562init-y := init/ 563drivers-y := drivers/ sound/ firmware/ 564net-y := net/ 565libs-y := lib/ 566core-y := usr/ 567endif # KBUILD_EXTMOD 568 569ifeq ($(dot-config),1) 570# Read in config 571-include include/config/auto.conf 572 573ifeq ($(KBUILD_EXTMOD),) 574# Read in dependencies to all Kconfig* files, make sure to run 575# oldconfig if changes are detected. 576-include include/config/auto.conf.cmd 577 578# To avoid any implicit rule to kick in, define an empty command 579$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ; 580 581# If .config is newer than include/config/auto.conf, someone tinkered 582# with it and forgot to run make oldconfig. 583# if auto.conf.cmd is missing then we are probably in a cleaned tree so 584# we execute the config step to be sure to catch updated Kconfig files 585include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd 586 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig 587else 588# external modules needs include/generated/autoconf.h and include/config/auto.conf 589# but do not care if they are up-to-date. Use auto.conf to trigger the test 590PHONY += include/config/auto.conf 591 592include/config/auto.conf: 593 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 594 echo >&2; \ 595 echo >&2 " ERROR: Kernel configuration is invalid."; \ 596 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 597 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 598 echo >&2 ; \ 599 /bin/false) 600 601endif # KBUILD_EXTMOD 602 603else 604# Dummy target needed, because used as prerequisite 605include/config/auto.conf: ; 606endif # $(dot-config) 607 608# The all: target is the default when no target is given on the 609# command line. 610# This allow a user to issue only 'make' to build a kernel including modules 611# Defaults to vmlinux, but the arch makefile usually adds further targets 612all: vmlinux 613 614include $(srctree)/arch/$(SRCARCH)/Makefile 615 616KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,) 617 618ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 619KBUILD_CFLAGS += -Os $(call cc-disable-warning,maybe-uninitialized,) 620else 621KBUILD_CFLAGS += -O2 622endif 623 624ifdef CONFIG_READABLE_ASM 625# Disable optimizations that make assembler listings hard to read. 626# reorder blocks reorders the control in the function 627# ipa clone creates specialized cloned functions 628# partial inlining inlines only parts of functions 629KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \ 630 $(call cc-option,-fno-ipa-cp-clone,) \ 631 $(call cc-option,-fno-partial-inlining) 632endif 633 634ifneq ($(CONFIG_FRAME_WARN),0) 635KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN}) 636endif 637 638# Handle stack protector mode. 639ifdef CONFIG_CC_STACKPROTECTOR_REGULAR 640 stackp-flag := -fstack-protector 641 ifeq ($(call cc-option, $(stackp-flag)),) 642 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_REGULAR: \ 643 -fstack-protector not supported by compiler) 644 endif 645else 646ifdef CONFIG_CC_STACKPROTECTOR_STRONG 647 stackp-flag := -fstack-protector-strong 648 ifeq ($(call cc-option, $(stackp-flag)),) 649 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: \ 650 -fstack-protector-strong not supported by compiler) 651 endif 652else 653 # Force off for distro compilers that enable stack protector by default. 654 stackp-flag := $(call cc-option, -fno-stack-protector) 655endif 656endif 657KBUILD_CFLAGS += $(stackp-flag) 658 659ifeq ($(COMPILER),clang) 660KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,) 661KBUILD_CPPFLAGS += $(call cc-option,-Wno-unknown-warning-option,) 662KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable) 663KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier) 664KBUILD_CFLAGS += $(call cc-disable-warning, gnu) 665# Quiet clang warning: comparison of unsigned expression < 0 is always false 666KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare) 667# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the 668# source of a reference will be _MergedGlobals and not on of the whitelisted names. 669# See modpost pattern 2 670KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,) 671else 672 673# This warning generated too much noise in a regular build. 674# Use make W=1 to enable this warning (see scripts/Makefile.build) 675KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable) 676endif 677 678ifdef CONFIG_FRAME_POINTER 679KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 680else 681# Some targets (ARM with Thumb2, for example), can't be built with frame 682# pointers. For those, we don't have FUNCTION_TRACER automatically 683# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 684# incompatible with -fomit-frame-pointer with current GCC, so we don't use 685# -fomit-frame-pointer with FUNCTION_TRACER. 686ifndef CONFIG_FUNCTION_TRACER 687KBUILD_CFLAGS += -fomit-frame-pointer 688endif 689endif 690 691ifdef CONFIG_DEBUG_INFO 692KBUILD_CFLAGS += -g 693KBUILD_AFLAGS += -Wa,-gdwarf-2 694endif 695 696ifdef CONFIG_DEBUG_INFO_REDUCED 697KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \ 698 $(call cc-option,-fno-var-tracking) 699endif 700 701ifdef CONFIG_FUNCTION_TRACER 702ifdef CONFIG_HAVE_FENTRY 703CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY) 704endif 705KBUILD_CFLAGS += -pg $(CC_USING_FENTRY) 706KBUILD_AFLAGS += $(CC_USING_FENTRY) 707ifdef CONFIG_DYNAMIC_FTRACE 708 ifdef CONFIG_HAVE_C_RECORDMCOUNT 709 BUILD_C_RECORDMCOUNT := y 710 export BUILD_C_RECORDMCOUNT 711 endif 712endif 713endif 714 715# We trigger additional mismatches with less inlining 716ifdef CONFIG_DEBUG_SECTION_MISMATCH 717KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) 718endif 719 720# arch Makefile may override CC so keep this after arch Makefile is included 721NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) 722CHECKFLAGS += $(NOSTDINC_FLAGS) 723 724# warn about C99 declaration after statement 725KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,) 726 727# disable pointer signed / unsigned warnings in gcc 4.0 728KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign) 729 730# disable invalid "can't wrap" optimizations for signed / pointers 731KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow) 732 733# conserve stack if available 734KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) 735 736# disallow errors like 'EXPORT_GPL(foo);' with missing header 737KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int) 738 739# require functions to have arguments in prototypes, not empty 'int foo()' 740KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes) 741 742# Prohibit date/time macros, which would make the build non-deterministic 743KBUILD_CFLAGS += $(call cc-option,-Werror=date-time) 744 745# use the deterministic mode of AR if available 746KBUILD_ARFLAGS := $(call ar-option,D) 747 748# check for 'asm goto' 749ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y) 750 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO 751endif 752 753include $(srctree)/scripts/Makefile.extrawarn 754 755# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments 756KBUILD_CPPFLAGS += $(KCPPFLAGS) 757KBUILD_AFLAGS += $(KAFLAGS) 758KBUILD_CFLAGS += $(KCFLAGS) 759 760# Use --build-id when available. 761LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\ 762 $(call cc-ldoption, -Wl$(comma)--build-id,)) 763KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID) 764LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID) 765 766ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 767LDFLAGS_vmlinux += $(call ld-option, -X,) 768endif 769 770# Default kernel image to build when no specific target is given. 771# KBUILD_IMAGE may be overruled on the command line or 772# set in the environment 773# Also any assignments in arch/$(ARCH)/Makefile take precedence over 774# this default value 775export KBUILD_IMAGE ?= vmlinux 776 777# 778# INSTALL_PATH specifies where to place the updated kernel and system map 779# images. Default is /boot, but you can set it to other values 780export INSTALL_PATH ?= /boot 781 782# 783# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 784# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 785# an argument if needed. Otherwise it defaults to the kernel install path 786# 787export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 788 789# 790# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 791# relocations required by build roots. This is not defined in the 792# makefile but the argument can be passed to make if needed. 793# 794 795MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 796export MODLIB 797 798# 799# INSTALL_MOD_STRIP, if defined, will cause modules to be 800# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then 801# the default option --strip-debug will be used. Otherwise, 802# INSTALL_MOD_STRIP value will be used as the options to the strip command. 803 804ifdef INSTALL_MOD_STRIP 805ifeq ($(INSTALL_MOD_STRIP),1) 806mod_strip_cmd = $(STRIP) --strip-debug 807else 808mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP) 809endif # INSTALL_MOD_STRIP=1 810else 811mod_strip_cmd = true 812endif # INSTALL_MOD_STRIP 813export mod_strip_cmd 814 815# Select initial ramdisk compression format, default is gzip(1). 816# This shall be used by the dracut(8) tool while creating an initramfs image. 817# 818INITRD_COMPRESS-y := gzip 819INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2 820INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma 821INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz 822INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo 823INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4 824# do not export INITRD_COMPRESS, since we didn't actually 825# choose a sane default compression above. 826# export INITRD_COMPRESS := $(INITRD_COMPRESS-y) 827 828ifdef CONFIG_MODULE_SIG_ALL 829MODSECKEY = ./signing_key.priv 830MODPUBKEY = ./signing_key.x509 831export MODPUBKEY 832mod_sign_cmd = perl $(srctree)/scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODSECKEY) $(MODPUBKEY) 833else 834mod_sign_cmd = true 835endif 836export mod_sign_cmd 837 838 839ifeq ($(KBUILD_EXTMOD),) 840core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/ 841 842vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \ 843 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 844 $(net-y) $(net-m) $(libs-y) $(libs-m))) 845 846vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \ 847 $(init-n) $(init-) \ 848 $(core-n) $(core-) $(drivers-n) $(drivers-) \ 849 $(net-n) $(net-) $(libs-n) $(libs-)))) 850 851init-y := $(patsubst %/, %/built-in.o, $(init-y)) 852core-y := $(patsubst %/, %/built-in.o, $(core-y)) 853drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y)) 854net-y := $(patsubst %/, %/built-in.o, $(net-y)) 855libs-y1 := $(patsubst %/, %/lib.a, $(libs-y)) 856libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y)) 857libs-y := $(libs-y1) $(libs-y2) 858 859# Externally visible symbols (used by link-vmlinux.sh) 860export KBUILD_VMLINUX_INIT := $(head-y) $(init-y) 861export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y) 862export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 863export LDFLAGS_vmlinux 864# used by scripts/pacmage/Makefile 865export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools virt) 866 867vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) 868 869# Final link of vmlinux 870 cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) 871quiet_cmd_link-vmlinux = LINK $@ 872 873# Include targets which we want to 874# execute if the rest of the kernel build went well. 875vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE 876ifdef CONFIG_HEADERS_CHECK 877 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check 878endif 879ifdef CONFIG_SAMPLES 880 $(Q)$(MAKE) $(build)=samples 881endif 882ifdef CONFIG_BUILD_DOCSRC 883 $(Q)$(MAKE) $(build)=Documentation 884endif 885 +$(call if_changed,link-vmlinux) 886 887# The actual objects are generated when descending, 888# make sure no implicit rule kicks in 889$(sort $(vmlinux-deps)): $(vmlinux-dirs) ; 890 891# Handle descending into subdirectories listed in $(vmlinux-dirs) 892# Preset locale variables to speed up the build process. Limit locale 893# tweaks to this spot to avoid wrong language settings when running 894# make menuconfig etc. 895# Error messages still appears in the original language 896 897PHONY += $(vmlinux-dirs) 898$(vmlinux-dirs): prepare scripts 899 $(Q)$(MAKE) $(build)=$@ 900 901define filechk_kernel.release 902 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 903endef 904 905# Store (new) KERNELRELEASE string in include/config/kernel.release 906include/config/kernel.release: include/config/auto.conf FORCE 907 $(call filechk,kernel.release) 908 909 910# Things we need to do before we recursively start building the kernel 911# or the modules are listed in "prepare". 912# A multi level approach is used. prepareN is processed before prepareN-1. 913# archprepare is used in arch Makefiles and when processed asm symlink, 914# version.h and scripts_basic is processed / created. 915 916# Listed in dependency order 917PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3 918 919# prepare3 is used to check if we are building in a separate output directory, 920# and if so do: 921# 1) Check that make has not been executed in the kernel src $(srctree) 922prepare3: include/config/kernel.release 923ifneq ($(KBUILD_SRC),) 924 @$(kecho) ' Using $(srctree) as source for kernel' 925 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \ 926 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \ 927 echo >&2 " in the '$(srctree)' directory.";\ 928 /bin/false; \ 929 fi; 930endif 931 932# prepare2 creates a makefile if using a separate output directory 933prepare2: prepare3 outputmakefile asm-generic 934 935prepare1: prepare2 $(version_h) include/generated/utsrelease.h \ 936 include/config/auto.conf 937 $(cmd_crmodverdir) 938 939archprepare: archheaders archscripts prepare1 scripts_basic 940 941prepare0: archprepare FORCE 942 $(Q)$(MAKE) $(build)=. 943 944# All the preparing.. 945prepare: prepare0 946 947# Generate some files 948# --------------------------------------------------------------------------- 949 950# KERNELRELEASE can change from a few different places, meaning version.h 951# needs to be updated, so this check is forced on all builds 952 953uts_len := 64 954define filechk_utsrelease.h 955 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 956 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 957 exit 1; \ 958 fi; \ 959 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";) 960endef 961 962define filechk_version.h 963 (echo \#define LINUX_VERSION_CODE $(shell \ 964 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \ 965 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';) 966endef 967 968$(version_h): $(srctree)/Makefile FORCE 969 $(call filechk,version.h) 970 971include/generated/utsrelease.h: include/config/kernel.release FORCE 972 $(call filechk,utsrelease.h) 973 974PHONY += headerdep 975headerdep: 976 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 977 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 978 979# --------------------------------------------------------------------------- 980 981PHONY += depend dep 982depend dep: 983 @echo '*** Warning: make $@ is unnecessary now.' 984 985# --------------------------------------------------------------------------- 986# Firmware install 987INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware 988export INSTALL_FW_PATH 989 990PHONY += firmware_install 991firmware_install: FORCE 992 @mkdir -p $(objtree)/firmware 993 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install 994 995# --------------------------------------------------------------------------- 996# Kernel headers 997 998#Default location for installed headers 999export INSTALL_HDR_PATH = $(objtree)/usr 1000 1001hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj 1002 1003# If we do an all arch process set dst to asm-$(hdr-arch) 1004hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm) 1005 1006PHONY += archheaders 1007archheaders: 1008 1009PHONY += archscripts 1010archscripts: 1011 1012PHONY += __headers 1013__headers: $(version_h) scripts_basic asm-generic archheaders archscripts FORCE 1014 $(Q)$(MAKE) $(build)=scripts build_unifdef 1015 1016PHONY += headers_install_all 1017headers_install_all: 1018 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install 1019 1020PHONY += headers_install 1021headers_install: __headers 1022 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \ 1023 $(error Headers not exportable for the $(SRCARCH) architecture)) 1024 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1025 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) 1026 1027PHONY += headers_check_all 1028headers_check_all: headers_install_all 1029 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check 1030 1031PHONY += headers_check 1032headers_check: headers_install 1033 $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1 1034 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1 1035 1036# --------------------------------------------------------------------------- 1037# Modules 1038 1039ifdef CONFIG_MODULES 1040 1041# By default, build modules as well 1042 1043all: modules 1044 1045# Build modules 1046# 1047# A module can be listed more than once in obj-m resulting in 1048# duplicate lines in modules.order files. Those are removed 1049# using awk while concatenating to the final file. 1050 1051PHONY += modules 1052modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin 1053 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order 1054 @$(kecho) ' Building modules, stage 2.'; 1055 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1056 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild 1057 1058modules.builtin: $(vmlinux-dirs:%=%/modules.builtin) 1059 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin 1060 1061%/modules.builtin: include/config/auto.conf 1062 $(Q)$(MAKE) $(modbuiltin)=$* 1063 1064 1065# Target to prepare building external modules 1066PHONY += modules_prepare 1067modules_prepare: prepare scripts 1068 1069# Target to install modules 1070PHONY += modules_install 1071modules_install: _modinst_ _modinst_post 1072 1073PHONY += _modinst_ 1074_modinst_: 1075 @rm -rf $(MODLIB)/kernel 1076 @rm -f $(MODLIB)/source 1077 @mkdir -p $(MODLIB)/kernel 1078 @ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source 1079 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1080 rm -f $(MODLIB)/build ; \ 1081 ln -s $(CURDIR) $(MODLIB)/build ; \ 1082 fi 1083 @cp -f $(objtree)/modules.order $(MODLIB)/ 1084 @cp -f $(objtree)/modules.builtin $(MODLIB)/ 1085 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1086 1087# This depmod is only for convenience to give the initial 1088# boot a modules.dep even before / is mounted read-write. However the 1089# boot script depmod is the master version. 1090PHONY += _modinst_post 1091_modinst_post: _modinst_ 1092 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst 1093 $(call cmd,depmod) 1094 1095ifeq ($(CONFIG_MODULE_SIG), y) 1096PHONY += modules_sign 1097modules_sign: 1098 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign 1099endif 1100 1101else # CONFIG_MODULES 1102 1103# Modules not configured 1104# --------------------------------------------------------------------------- 1105 1106modules modules_install: FORCE 1107 @echo >&2 1108 @echo >&2 "The present kernel configuration has modules disabled." 1109 @echo >&2 "Type 'make config' and enable loadable module support." 1110 @echo >&2 "Then build a kernel with module support enabled." 1111 @echo >&2 1112 @exit 1 1113 1114endif # CONFIG_MODULES 1115 1116### 1117# Cleaning is done on three levels. 1118# make clean Delete most generated files 1119# Leave enough to build external modules 1120# make mrproper Delete the current configuration, and all generated files 1121# make distclean Remove editor backup files, patch leftover files and the like 1122 1123# Directories & files removed with 'make clean' 1124CLEAN_DIRS += $(MODVERDIR) 1125 1126# Directories & files removed with 'make mrproper' 1127MRPROPER_DIRS += include/config usr/include include/generated \ 1128 arch/*/include/generated .tmp_objdiff 1129MRPROPER_FILES += .config .config.old .version .old_version $(version_h) \ 1130 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \ 1131 signing_key.priv signing_key.x509 x509.genkey \ 1132 extra_certificates signing_key.x509.keyid \ 1133 signing_key.x509.signer include/linux/version.h 1134 1135# clean - Delete most, but leave enough to build external modules 1136# 1137clean: rm-dirs := $(CLEAN_DIRS) 1138clean: rm-files := $(CLEAN_FILES) 1139clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples) 1140 1141PHONY += $(clean-dirs) clean archclean vmlinuxclean 1142$(clean-dirs): 1143 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1144 1145vmlinuxclean: 1146 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1147 1148clean: archclean vmlinuxclean 1149 1150# mrproper - Delete all generated files, including .config 1151# 1152mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS)) 1153mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1154mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts) 1155 1156PHONY += $(mrproper-dirs) mrproper archmrproper 1157$(mrproper-dirs): 1158 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1159 1160mrproper: clean archmrproper $(mrproper-dirs) 1161 $(call cmd,rmdirs) 1162 $(call cmd,rmfiles) 1163 1164# distclean 1165# 1166PHONY += distclean 1167 1168distclean: mrproper 1169 @find $(srctree) $(RCS_FIND_IGNORE) \ 1170 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1171 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \ 1172 -o -name '.*.rej' -o -name '*%' -o -name 'core' \) \ 1173 -type f -print | xargs rm -f 1174 1175 1176# Packaging of the kernel to various formats 1177# --------------------------------------------------------------------------- 1178# rpm target kept for backward compatibility 1179package-dir := scripts/package 1180 1181%src-pkg: FORCE 1182 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1183%pkg: include/config/kernel.release FORCE 1184 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1185rpm: include/config/kernel.release FORCE 1186 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1187 1188 1189# Brief documentation of the typical targets used 1190# --------------------------------------------------------------------------- 1191 1192boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1193boards := $(notdir $(boards)) 1194board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1195board-dirs := $(sort $(notdir $(board-dirs:/=))) 1196 1197help: 1198 @echo 'Cleaning targets:' 1199 @echo ' clean - Remove most generated files but keep the config and' 1200 @echo ' enough build support to build external modules' 1201 @echo ' mrproper - Remove all generated files + config + various backup files' 1202 @echo ' distclean - mrproper + remove editor backup and patch files' 1203 @echo '' 1204 @echo 'Configuration targets:' 1205 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1206 @echo '' 1207 @echo 'Other generic targets:' 1208 @echo ' all - Build all targets marked with [*]' 1209 @echo '* vmlinux - Build the bare kernel' 1210 @echo '* modules - Build all modules' 1211 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1212 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH' 1213 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)' 1214 @echo ' dir/ - Build all files in dir and below' 1215 @echo ' dir/file.[oisS] - Build specified target only' 1216 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1217 @echo ' (requires a recent binutils and recent build (System.map))' 1218 @echo ' dir/file.ko - Build module including final link' 1219 @echo ' modules_prepare - Set up for building external modules' 1220 @echo ' tags/TAGS - Generate tags file for editors' 1221 @echo ' cscope - Generate cscope index' 1222 @echo ' gtags - Generate GNU GLOBAL index' 1223 @echo ' kernelrelease - Output the release version string' 1224 @echo ' kernelversion - Output the version stored in Makefile' 1225 @echo ' image_name - Output the image name' 1226 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1227 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1228 echo '' 1229 @echo 'Static analysers' 1230 @echo ' checkstack - Generate a list of stack hogs' 1231 @echo ' namespacecheck - Name space analysis on compiled kernel' 1232 @echo ' versioncheck - Sanity check on version.h usage' 1233 @echo ' includecheck - Check for duplicate included header files' 1234 @echo ' export_report - List the usages of all exported symbols' 1235 @echo ' headers_check - Sanity check on exported headers' 1236 @echo ' headerdep - Detect inclusion cycles in headers' 1237 @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help 1238 @echo '' 1239 @echo 'Kernel packaging:' 1240 @$(MAKE) $(build)=$(package-dir) help 1241 @echo '' 1242 @echo 'Documentation targets:' 1243 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp 1244 @echo '' 1245 @echo 'Architecture specific targets ($(SRCARCH)):' 1246 @$(if $(archhelp),$(archhelp),\ 1247 echo ' No architecture specific help defined for $(SRCARCH)') 1248 @echo '' 1249 @$(if $(boards), \ 1250 $(foreach b, $(boards), \ 1251 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1252 echo '') 1253 @$(if $(board-dirs), \ 1254 $(foreach b, $(board-dirs), \ 1255 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1256 printf " %-16s - Show all of the above\\n" help-boards; \ 1257 echo '') 1258 1259 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1260 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1261 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1262 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)' 1263 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1264 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1265 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where' 1266 @echo ' 1: warnings which may be relevant and do not occur too often' 1267 @echo ' 2: warnings which occur quite often but may still be relevant' 1268 @echo ' 3: more obscure warnings, can most likely be ignored' 1269 @echo ' Multiple levels can be combined with W=12 or W=123' 1270 @echo '' 1271 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1272 @echo 'For further info see the ./README file' 1273 1274 1275help-board-dirs := $(addprefix help-,$(board-dirs)) 1276 1277help-boards: $(help-board-dirs) 1278 1279boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)) 1280 1281$(help-board-dirs): help-%: 1282 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1283 @$(if $(boards-per-dir), \ 1284 $(foreach b, $(boards-per-dir), \ 1285 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1286 echo '') 1287 1288 1289# Documentation targets 1290# --------------------------------------------------------------------------- 1291%docs: scripts_basic FORCE 1292 $(Q)$(MAKE) $(build)=scripts build_docproc 1293 $(Q)$(MAKE) $(build)=Documentation/DocBook $@ 1294 1295else # KBUILD_EXTMOD 1296 1297### 1298# External module support. 1299# When building external modules the kernel used as basis is considered 1300# read-only, and no consistency checks are made and the make 1301# system is not used on the basis kernel. If updates are required 1302# in the basis kernel ordinary make commands (without M=...) must 1303# be used. 1304# 1305# The following are the only valid targets when building external 1306# modules. 1307# make M=dir clean Delete all automatically generated files 1308# make M=dir modules Make all modules in specified dir 1309# make M=dir Same as 'make M=dir modules' 1310# make M=dir modules_install 1311# Install the modules built in the module directory 1312# Assumes install directory is already created 1313 1314# We are always building modules 1315KBUILD_MODULES := 1 1316PHONY += crmodverdir 1317crmodverdir: 1318 $(cmd_crmodverdir) 1319 1320PHONY += $(objtree)/Module.symvers 1321$(objtree)/Module.symvers: 1322 @test -e $(objtree)/Module.symvers || ( \ 1323 echo; \ 1324 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \ 1325 echo " is missing; modules will have no dependencies and modversions."; \ 1326 echo ) 1327 1328module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD)) 1329PHONY += $(module-dirs) modules 1330$(module-dirs): crmodverdir $(objtree)/Module.symvers 1331 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@) 1332 1333modules: $(module-dirs) 1334 @$(kecho) ' Building modules, stage 2.'; 1335 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1336 1337PHONY += modules_install 1338modules_install: _emodinst_ _emodinst_post 1339 1340install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra) 1341PHONY += _emodinst_ 1342_emodinst_: 1343 $(Q)mkdir -p $(MODLIB)/$(install-dir) 1344 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1345 1346PHONY += _emodinst_post 1347_emodinst_post: _emodinst_ 1348 $(call cmd,depmod) 1349 1350clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD)) 1351 1352PHONY += $(clean-dirs) clean 1353$(clean-dirs): 1354 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1355 1356clean: rm-dirs := $(MODVERDIR) 1357clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers 1358 1359help: 1360 @echo ' Building external modules.' 1361 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1362 @echo '' 1363 @echo ' modules - default target, build the module(s)' 1364 @echo ' modules_install - install the module' 1365 @echo ' clean - remove generated files in module directory only' 1366 @echo '' 1367 1368# Dummies... 1369PHONY += prepare scripts 1370prepare: ; 1371scripts: ; 1372endif # KBUILD_EXTMOD 1373 1374clean: $(clean-dirs) 1375 $(call cmd,rmdirs) 1376 $(call cmd,rmfiles) 1377 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1378 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \ 1379 -o -name '*.ko.*' \ 1380 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1381 -o -name '*.symtypes' -o -name 'modules.order' \ 1382 -o -name modules.builtin -o -name '.tmp_*.o.*' \ 1383 -o -name '*.gcno' \) -type f -print | xargs rm -f 1384 1385# Generate tags for editors 1386# --------------------------------------------------------------------------- 1387quiet_cmd_tags = GEN $@ 1388 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@ 1389 1390tags TAGS cscope gtags: FORCE 1391 $(call cmd,tags) 1392 1393# Scripts to check various things for consistency 1394# --------------------------------------------------------------------------- 1395 1396PHONY += includecheck versioncheck coccicheck namespacecheck export_report 1397 1398includecheck: 1399 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1400 -name '*.[hcS]' -type f -print | sort \ 1401 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1402 1403versioncheck: 1404 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1405 -name '*.[hcS]' -type f -print | sort \ 1406 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1407 1408coccicheck: 1409 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@ 1410 1411namespacecheck: 1412 $(PERL) $(srctree)/scripts/namespace.pl 1413 1414export_report: 1415 $(PERL) $(srctree)/scripts/export_report.pl 1416 1417endif #ifeq ($(config-targets),1) 1418endif #ifeq ($(mixed-targets),1) 1419 1420PHONY += checkstack kernelrelease kernelversion image_name 1421 1422# UML needs a little special treatment here. It wants to use the host 1423# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1424# else wants $(ARCH), including people doing cross-builds, which means 1425# that $(SUBARCH) doesn't work here. 1426ifeq ($(ARCH), um) 1427CHECKSTACK_ARCH := $(SUBARCH) 1428else 1429CHECKSTACK_ARCH := $(ARCH) 1430endif 1431checkstack: 1432 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1433 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1434 1435kernelrelease: 1436 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1437 1438kernelversion: 1439 @echo $(KERNELVERSION) 1440 1441image_name: 1442 @echo $(KBUILD_IMAGE) 1443 1444# Clear a bunch of variables before executing the submake 1445tools/: FORCE 1446 $(Q)mkdir -p $(objtree)/tools 1447 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/ 1448 1449tools/%: FORCE 1450 $(Q)mkdir -p $(objtree)/tools 1451 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/ $* 1452 1453# Single targets 1454# --------------------------------------------------------------------------- 1455# Single targets are compatible with: 1456# - build with mixed source and output 1457# - build with separate output dir 'make O=...' 1458# - external modules 1459# 1460# target-dir => where to store outputfile 1461# build-dir => directory in kernel source tree to use 1462 1463ifeq ($(KBUILD_EXTMOD),) 1464 build-dir = $(patsubst %/,%,$(dir $@)) 1465 target-dir = $(dir $@) 1466else 1467 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@))) 1468 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash)) 1469 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@)) 1470endif 1471 1472%.s: %.c prepare scripts FORCE 1473 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1474%.i: %.c prepare scripts FORCE 1475 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1476%.o: %.c prepare scripts FORCE 1477 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1478%.lst: %.c prepare scripts FORCE 1479 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1480%.s: %.S prepare scripts FORCE 1481 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1482%.o: %.S prepare scripts FORCE 1483 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1484%.symtypes: %.c prepare scripts FORCE 1485 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1486 1487# Modules 1488/: prepare scripts FORCE 1489 $(cmd_crmodverdir) 1490 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1491 $(build)=$(build-dir) 1492%/: prepare scripts FORCE 1493 $(cmd_crmodverdir) 1494 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1495 $(build)=$(build-dir) 1496%.ko: prepare scripts FORCE 1497 $(cmd_crmodverdir) 1498 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1499 $(build)=$(build-dir) $(@:.ko=.o) 1500 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1501 1502# FIXME Should go into a make.lib or something 1503# =========================================================================== 1504 1505quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs))) 1506 cmd_rmdirs = rm -rf $(rm-dirs) 1507 1508quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1509 cmd_rmfiles = rm -f $(rm-files) 1510 1511# Run depmod only if we have System.map and depmod is executable 1512quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) 1513 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1514 $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))" 1515 1516# Create temporary dir for module support files 1517# clean it up only when building all modules 1518cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \ 1519 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*) 1520 1521# read all saved command lines 1522 1523targets := $(wildcard $(sort $(targets))) 1524cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd)) 1525 1526ifneq ($(cmd_files),) 1527 $(cmd_files): ; # Do not try to update included dependency files 1528 include $(cmd_files) 1529endif 1530 1531# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir 1532# Usage: 1533# $(Q)$(MAKE) $(clean)=dir 1534clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj 1535 1536endif # skip-makefile 1537 1538PHONY += FORCE 1539FORCE: 1540 1541# Declare the contents of the .PHONY variable as phony. We keep that 1542# information in a variable so we can use it in if_changed and friends. 1543.PHONY: $(PHONY) 1544