1VERSION = 4 2PATCHLEVEL = 13 3SUBLEVEL = 0 4EXTRAVERSION = 5NAME = Fearless Coyote 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# o Do not use make's built-in rules and variables 14# (this increases performance and avoids hard-to-debug behaviour); 15# o Look for make include files relative to root of kernel src 16MAKEFLAGS += -rR --include-dir=$(CURDIR) 17 18# Avoid funny character set dependencies 19unexport LC_ALL 20LC_COLLATE=C 21LC_NUMERIC=C 22export LC_COLLATE LC_NUMERIC 23 24# Avoid interference with shell env settings 25unexport GREP_OPTIONS 26 27# We are using a recursive build, so we need to do a little thinking 28# to get the ordering right. 29# 30# Most importantly: sub-Makefiles should only ever modify files in 31# their own directory. If in some directory we have a dependency on 32# a file in another dir (which doesn't happen often, but it's often 33# unavoidable when linking the built-in.o targets which finally 34# turn into vmlinux), we will call a sub make in that other dir, and 35# after that we are sure that everything which is in that other dir 36# is now up to date. 37# 38# The only cases where we need to modify files which have global 39# effects are thus separated out and done before the recursive 40# descending is started. They are now explicitly listed as the 41# prepare rule. 42 43# Beautify output 44# --------------------------------------------------------------------------- 45# 46# Normally, we echo the whole command before executing it. By making 47# that echo $($(quiet)$(cmd)), we now have the possibility to set 48# $(quiet) to choose other forms of output instead, e.g. 49# 50# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@ 51# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< 52# 53# If $(quiet) is empty, the whole command will be printed. 54# If it is set to "quiet_", only the short version will be printed. 55# If it is set to "silent_", nothing will be printed at all, since 56# the variable $(silent_cmd_cc_o_c) doesn't exist. 57# 58# A simple variant is to prefix commands with $(Q) - that's useful 59# for commands that shall be hidden in non-verbose mode. 60# 61# $(Q)ln $@ :< 62# 63# If KBUILD_VERBOSE equals 0 then the above command will be hidden. 64# If KBUILD_VERBOSE equals 1 then the above command is displayed. 65# 66# To put more focus on warnings, be less verbose as default 67# Use 'make V=1' to see the full commands 68 69ifeq ("$(origin V)", "command line") 70 KBUILD_VERBOSE = $(V) 71endif 72ifndef KBUILD_VERBOSE 73 KBUILD_VERBOSE = 0 74endif 75 76ifeq ($(KBUILD_VERBOSE),1) 77 quiet = 78 Q = 79else 80 quiet=quiet_ 81 Q = @ 82endif 83 84# If the user is running make -s (silent mode), suppress echoing of 85# commands 86 87ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),) 88 quiet=silent_ 89 tools_silent=s 90endif 91 92export quiet Q KBUILD_VERBOSE 93 94# kbuild supports saving output files in a separate directory. 95# To locate output files in a separate directory two syntaxes are supported. 96# In both cases the working directory must be the root of the kernel src. 97# 1) O= 98# Use "make O=dir/to/store/output/files/" 99# 100# 2) Set KBUILD_OUTPUT 101# Set the environment variable KBUILD_OUTPUT to point to the directory 102# where the output files shall be placed. 103# export KBUILD_OUTPUT=dir/to/store/output/files/ 104# make 105# 106# The O= assignment takes precedence over the KBUILD_OUTPUT environment 107# variable. 108 109# KBUILD_SRC is not intended to be used by the regular user (for now), 110# it is set on invocation of make with KBUILD_OUTPUT or O= specified. 111ifeq ($(KBUILD_SRC),) 112 113# OK, Make called in directory where kernel src resides 114# Do we want to locate output files in a separate directory? 115ifeq ("$(origin O)", "command line") 116 KBUILD_OUTPUT := $(O) 117endif 118 119# That's our default target when none is given on the command line 120PHONY := _all 121_all: 122 123# Cancel implicit rules on top Makefile 124$(CURDIR)/Makefile Makefile: ; 125 126ifneq ($(words $(subst :, ,$(CURDIR))), 1) 127 $(error main directory cannot contain spaces nor colons) 128endif 129 130ifneq ($(KBUILD_OUTPUT),) 131# check that the output directory actually exists 132saved-output := $(KBUILD_OUTPUT) 133KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \ 134 && /bin/pwd) 135$(if $(KBUILD_OUTPUT),, \ 136 $(error failed to create output directory "$(saved-output)")) 137 138PHONY += $(MAKECMDGOALS) sub-make 139 140$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make 141 @: 142 143# Invoke a second make in the output directory, passing relevant variables 144sub-make: 145 $(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \ 146 -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS)) 147 148# Leave processing to above invocation of make 149skip-makefile := 1 150endif # ifneq ($(KBUILD_OUTPUT),) 151endif # ifeq ($(KBUILD_SRC),) 152 153# We process the rest of the Makefile if this is the final invocation of make 154ifeq ($(skip-makefile),) 155 156# Do not print "Entering directory ...", 157# but we want to display it when entering to the output directory 158# so that IDEs/editors are able to understand relative filenames. 159MAKEFLAGS += --no-print-directory 160 161# Call a source code checker (by default, "sparse") as part of the 162# C compilation. 163# 164# Use 'make C=1' to enable checking of only re-compiled files. 165# Use 'make C=2' to enable checking of *all* source files, regardless 166# of whether they are re-compiled or not. 167# 168# See the file "Documentation/dev-tools/sparse.rst" for more details, 169# including where to get the "sparse" utility. 170 171ifeq ("$(origin C)", "command line") 172 KBUILD_CHECKSRC = $(C) 173endif 174ifndef KBUILD_CHECKSRC 175 KBUILD_CHECKSRC = 0 176endif 177 178# Use make M=dir to specify directory of external module to build 179# Old syntax make ... SUBDIRS=$PWD is still supported 180# Setting the environment variable KBUILD_EXTMOD take precedence 181ifdef SUBDIRS 182 KBUILD_EXTMOD ?= $(SUBDIRS) 183endif 184 185ifeq ("$(origin M)", "command line") 186 KBUILD_EXTMOD := $(M) 187endif 188 189# If building an external module we do not care about the all: rule 190# but instead _all depend on modules 191PHONY += all 192ifeq ($(KBUILD_EXTMOD),) 193_all: all 194else 195_all: modules 196endif 197 198ifeq ($(KBUILD_SRC),) 199 # building in the source tree 200 srctree := . 201else 202 ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR))) 203 # building in a subdirectory of the source tree 204 srctree := .. 205 else 206 srctree := $(KBUILD_SRC) 207 endif 208endif 209objtree := . 210src := $(srctree) 211obj := $(objtree) 212 213VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD)) 214 215export srctree objtree VPATH 216 217# SUBARCH tells the usermode build what the underlying arch is. That is set 218# first, and if a usermode build is happening, the "ARCH=um" on the command 219# line overrides the setting of ARCH below. If a native build is happening, 220# then ARCH is assigned, getting whatever value it gets normally, and 221# SUBARCH is subsequently ignored. 222 223SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \ 224 -e s/sun4u/sparc64/ \ 225 -e s/arm.*/arm/ -e s/sa110/arm/ \ 226 -e s/s390x/s390/ -e s/parisc64/parisc/ \ 227 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \ 228 -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ ) 229 230# Cross compiling and selecting different set of gcc/bin-utils 231# --------------------------------------------------------------------------- 232# 233# When performing cross compilation for other architectures ARCH shall be set 234# to the target architecture. (See arch/* for the possibilities). 235# ARCH can be set during invocation of make: 236# make ARCH=ia64 237# Another way is to have ARCH set in the environment. 238# The default ARCH is the host where make is executed. 239 240# CROSS_COMPILE specify the prefix used for all executables used 241# during compilation. Only gcc and related bin-utils executables 242# are prefixed with $(CROSS_COMPILE). 243# CROSS_COMPILE can be set on the command line 244# make CROSS_COMPILE=ia64-linux- 245# Alternatively CROSS_COMPILE can be set in the environment. 246# A third alternative is to store a setting in .config so that plain 247# "make" in the configured kernel build directory always uses that. 248# Default value for CROSS_COMPILE is not to prefix executables 249# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 250ARCH ?= $(SUBARCH) 251CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%) 252 253# Architecture as present in compile.h 254UTS_MACHINE := $(ARCH) 255SRCARCH := $(ARCH) 256 257# Additional ARCH settings for x86 258ifeq ($(ARCH),i386) 259 SRCARCH := x86 260endif 261ifeq ($(ARCH),x86_64) 262 SRCARCH := x86 263endif 264 265# Additional ARCH settings for sparc 266ifeq ($(ARCH),sparc32) 267 SRCARCH := sparc 268endif 269ifeq ($(ARCH),sparc64) 270 SRCARCH := sparc 271endif 272 273# Additional ARCH settings for sh 274ifeq ($(ARCH),sh64) 275 SRCARCH := sh 276endif 277 278# Additional ARCH settings for tile 279ifeq ($(ARCH),tilepro) 280 SRCARCH := tile 281endif 282ifeq ($(ARCH),tilegx) 283 SRCARCH := tile 284endif 285 286# Where to locate arch specific headers 287hdr-arch := $(SRCARCH) 288 289KCONFIG_CONFIG ?= .config 290export KCONFIG_CONFIG 291 292# SHELL used by kbuild 293CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \ 294 else if [ -x /bin/bash ]; then echo /bin/bash; \ 295 else echo sh; fi ; fi) 296 297HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS) 298HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS) 299HOST_LFS_LIBS := $(shell getconf LFS_LIBS) 300 301HOSTCC = gcc 302HOSTCXX = g++ 303HOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \ 304 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) 305HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS) 306HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) 307HOST_LOADLIBES := $(HOST_LFS_LIBS) 308 309ifeq ($(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 343 344# We need some generic definitions (do not try to remake the file). 345scripts/Kbuild.include: ; 346include scripts/Kbuild.include 347 348# Make variables (CC, etc...) 349AS = $(CROSS_COMPILE)as 350LD = $(CROSS_COMPILE)ld 351CC = $(CROSS_COMPILE)gcc 352CPP = $(CC) -E 353AR = $(CROSS_COMPILE)ar 354NM = $(CROSS_COMPILE)nm 355STRIP = $(CROSS_COMPILE)strip 356OBJCOPY = $(CROSS_COMPILE)objcopy 357OBJDUMP = $(CROSS_COMPILE)objdump 358AWK = awk 359GENKSYMS = scripts/genksyms/genksyms 360INSTALLKERNEL := installkernel 361DEPMOD = /sbin/depmod 362PERL = perl 363PYTHON = python 364CHECK = sparse 365 366CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 367 -Wbitwise -Wno-return-void $(CF) 368NOSTDINC_FLAGS = 369CFLAGS_MODULE = 370AFLAGS_MODULE = 371LDFLAGS_MODULE = 372CFLAGS_KERNEL = 373AFLAGS_KERNEL = 374LDFLAGS_vmlinux = 375CFLAGS_GCOV := -fprofile-arcs -ftest-coverage -fno-tree-loop-im $(call cc-disable-warning,maybe-uninitialized,) 376CFLAGS_KCOV := $(call cc-option,-fsanitize-coverage=trace-pc,) 377 378 379# Use USERINCLUDE when you must reference the UAPI directories only. 380USERINCLUDE := \ 381 -I$(srctree)/arch/$(hdr-arch)/include/uapi \ 382 -I$(objtree)/arch/$(hdr-arch)/include/generated/uapi \ 383 -I$(srctree)/include/uapi \ 384 -I$(objtree)/include/generated/uapi \ 385 -include $(srctree)/include/linux/kconfig.h 386 387# Use LINUXINCLUDE when you must reference the include/ directory. 388# Needed to be compatible with the O= option 389LINUXINCLUDE := \ 390 -I$(srctree)/arch/$(hdr-arch)/include \ 391 -I$(objtree)/arch/$(hdr-arch)/include/generated \ 392 $(if $(KBUILD_SRC), -I$(srctree)/include) \ 393 -I$(objtree)/include \ 394 $(USERINCLUDE) 395 396KBUILD_CPPFLAGS := -D__KERNEL__ 397 398KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \ 399 -fno-strict-aliasing -fno-common -fshort-wchar \ 400 -Werror-implicit-function-declaration \ 401 -Wno-format-security \ 402 -std=gnu89 $(call cc-option,-fno-PIE) 403 404 405KBUILD_AFLAGS_KERNEL := 406KBUILD_CFLAGS_KERNEL := 407KBUILD_AFLAGS := -D__ASSEMBLY__ $(call cc-option,-fno-PIE) 408KBUILD_AFLAGS_MODULE := -DMODULE 409KBUILD_CFLAGS_MODULE := -DMODULE 410KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds 411 412# Read KERNELRELEASE from include/config/kernel.release (if it exists) 413KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null) 414KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 415 416export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 417export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC 418export CPP AR NM STRIP OBJCOPY OBJDUMP HOSTLDFLAGS HOST_LOADLIBES 419export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE 420export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS 421 422export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS 423export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV CFLAGS_KCOV CFLAGS_KASAN CFLAGS_UBSAN 424export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 425export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 426export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 427export KBUILD_ARFLAGS 428 429# When compiling out-of-tree modules, put MODVERDIR in the module 430# tree rather than in the kernel tree. The kernel tree might 431# even be read-only. 432export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions 433 434# Files to ignore in find ... statements 435 436export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 437 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 438 -prune -o 439export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 440 --exclude CVS --exclude .pc --exclude .hg --exclude .git 441 442# =========================================================================== 443# Rules shared between *config targets and build targets 444 445# Basic helpers built in scripts/basic/ 446PHONY += scripts_basic 447scripts_basic: 448 $(Q)$(MAKE) $(build)=scripts/basic 449 $(Q)rm -f .tmp_quiet_recordmcount 450 451# To avoid any implicit rule to kick in, define an empty command. 452scripts/basic/%: scripts_basic ; 453 454PHONY += outputmakefile 455# outputmakefile generates a Makefile in the output directory, if using a 456# separate output directory. This allows convenient use of make in the 457# output directory. 458outputmakefile: 459ifneq ($(KBUILD_SRC),) 460 $(Q)ln -fsn $(srctree) source 461 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \ 462 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL) 463endif 464 465# Support for using generic headers in asm-generic 466PHONY += asm-generic uapi-asm-generic 467asm-generic: uapi-asm-generic 468 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \ 469 src=asm obj=arch/$(SRCARCH)/include/generated/asm 470uapi-asm-generic: 471 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \ 472 src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm 473 474# To make sure we do not include .config for any of the *config targets 475# catch them early, and hand them over to scripts/kconfig/Makefile 476# It is allowed to specify more targets when calling make, including 477# mixing *config targets and build targets. 478# For example 'make oldconfig all'. 479# Detect when mixed targets is specified, and make a second invocation 480# of make so .config is not included in this case either (for *config). 481 482version_h := include/generated/uapi/linux/version.h 483old_version_h := include/linux/version.h 484 485no-dot-config-targets := clean mrproper distclean \ 486 cscope gtags TAGS tags help% %docs check% coccicheck \ 487 $(version_h) headers_% archheaders archscripts \ 488 kernelversion %src-pkg 489 490config-targets := 0 491mixed-targets := 0 492dot-config := 1 493 494ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 495 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 496 dot-config := 0 497 endif 498endif 499 500ifeq ($(KBUILD_EXTMOD),) 501 ifneq ($(filter config %config,$(MAKECMDGOALS)),) 502 config-targets := 1 503 ifneq ($(words $(MAKECMDGOALS)),1) 504 mixed-targets := 1 505 endif 506 endif 507endif 508# install and modules_install need also be processed one by one 509ifneq ($(filter install,$(MAKECMDGOALS)),) 510 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 511 mixed-targets := 1 512 endif 513endif 514 515ifeq ($(mixed-targets),1) 516# =========================================================================== 517# We're called with mixed targets (*config and build targets). 518# Handle them one by one. 519 520PHONY += $(MAKECMDGOALS) __build_one_by_one 521 522$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one 523 @: 524 525__build_one_by_one: 526 $(Q)set -e; \ 527 for i in $(MAKECMDGOALS); do \ 528 $(MAKE) -f $(srctree)/Makefile $$i; \ 529 done 530 531else 532ifeq ($(config-targets),1) 533# =========================================================================== 534# *config targets only - make sure prerequisites are updated, and descend 535# in scripts/kconfig to make the *config target 536 537# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 538# KBUILD_DEFCONFIG may point out an alternative default configuration 539# used for 'make defconfig' 540include arch/$(SRCARCH)/Makefile 541export KBUILD_DEFCONFIG KBUILD_KCONFIG 542 543config: scripts_basic outputmakefile FORCE 544 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 545 546%config: scripts_basic outputmakefile FORCE 547 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 548 549else 550# =========================================================================== 551# Build targets only - this includes vmlinux, arch specific targets, clean 552# targets and others. In general all targets except *config targets. 553 554ifeq ($(KBUILD_EXTMOD),) 555# Additional helpers built in scripts/ 556# Carefully list dependencies so we do not try to build scripts twice 557# in parallel 558PHONY += scripts 559scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \ 560 asm-generic gcc-plugins 561 $(Q)$(MAKE) $(build)=$(@) 562 563# Objects we will link into vmlinux / subdirs we need to visit 564init-y := init/ 565drivers-y := drivers/ sound/ firmware/ 566net-y := net/ 567libs-y := lib/ 568core-y := usr/ 569virt-y := virt/ 570endif # KBUILD_EXTMOD 571 572ifeq ($(dot-config),1) 573# Read in config 574-include include/config/auto.conf 575 576ifeq ($(KBUILD_EXTMOD),) 577# Read in dependencies to all Kconfig* files, make sure to run 578# oldconfig if changes are detected. 579-include include/config/auto.conf.cmd 580 581# To avoid any implicit rule to kick in, define an empty command 582$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ; 583 584# If .config is newer than include/config/auto.conf, someone tinkered 585# with it and forgot to run make oldconfig. 586# if auto.conf.cmd is missing then we are probably in a cleaned tree so 587# we execute the config step to be sure to catch updated Kconfig files 588include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd 589 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig 590else 591# external modules needs include/generated/autoconf.h and include/config/auto.conf 592# but do not care if they are up-to-date. Use auto.conf to trigger the test 593PHONY += include/config/auto.conf 594 595include/config/auto.conf: 596 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 597 echo >&2; \ 598 echo >&2 " ERROR: Kernel configuration is invalid."; \ 599 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 600 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 601 echo >&2 ; \ 602 /bin/false) 603 604endif # KBUILD_EXTMOD 605 606else 607# Dummy target needed, because used as prerequisite 608include/config/auto.conf: ; 609endif # $(dot-config) 610 611# For the kernel to actually contain only the needed exported symbols, 612# we have to build modules as well to determine what those symbols are. 613# (this can be evaluated only once include/config/auto.conf has been included) 614ifdef CONFIG_TRIM_UNUSED_KSYMS 615 KBUILD_MODULES := 1 616endif 617 618# The all: target is the default when no target is given on the 619# command line. 620# This allow a user to issue only 'make' to build a kernel including modules 621# Defaults to vmlinux, but the arch makefile usually adds further targets 622all: vmlinux 623 624# The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default 625# values of the respective KBUILD_* variables 626ARCH_CPPFLAGS := 627ARCH_AFLAGS := 628ARCH_CFLAGS := 629include arch/$(SRCARCH)/Makefile 630 631KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,) 632KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) 633KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) 634KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) 635KBUILD_CFLAGS += $(call cc-disable-warning, int-in-bool-context) 636 637ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 638KBUILD_CFLAGS += $(call cc-option,-Oz,-Os) 639KBUILD_CFLAGS += $(call cc-disable-warning,maybe-uninitialized,) 640else 641ifdef CONFIG_PROFILE_ALL_BRANCHES 642KBUILD_CFLAGS += -O2 $(call cc-disable-warning,maybe-uninitialized,) 643else 644KBUILD_CFLAGS += -O2 645endif 646endif 647 648KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \ 649 $(call cc-disable-warning,maybe-uninitialized,)) 650 651# Tell gcc to never replace conditional load with a non-conditional one 652KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 653 654# check for 'asm goto' 655ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y) 656 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO 657 KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO 658endif 659 660include scripts/Makefile.gcc-plugins 661 662ifdef CONFIG_READABLE_ASM 663# Disable optimizations that make assembler listings hard to read. 664# reorder blocks reorders the control in the function 665# ipa clone creates specialized cloned functions 666# partial inlining inlines only parts of functions 667KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \ 668 $(call cc-option,-fno-ipa-cp-clone,) \ 669 $(call cc-option,-fno-partial-inlining) 670endif 671 672ifneq ($(CONFIG_FRAME_WARN),0) 673KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN}) 674endif 675 676# This selects the stack protector compiler flag. Testing it is delayed 677# until after .config has been reprocessed, in the prepare-compiler-check 678# target. 679ifdef CONFIG_CC_STACKPROTECTOR_REGULAR 680 stackp-flag := -fstack-protector 681 stackp-name := REGULAR 682else 683ifdef CONFIG_CC_STACKPROTECTOR_STRONG 684 stackp-flag := -fstack-protector-strong 685 stackp-name := STRONG 686else 687 # Force off for distro compilers that enable stack protector by default. 688 stackp-flag := $(call cc-option, -fno-stack-protector) 689endif 690endif 691# Find arch-specific stack protector compiler sanity-checking script. 692ifdef CONFIG_CC_STACKPROTECTOR 693 stackp-path := $(srctree)/scripts/gcc-$(SRCARCH)_$(BITS)-has-stack-protector.sh 694 stackp-check := $(wildcard $(stackp-path)) 695endif 696KBUILD_CFLAGS += $(stackp-flag) 697 698ifeq ($(cc-name),clang) 699ifneq ($(CROSS_COMPILE),) 700CLANG_TARGET := -target $(notdir $(CROSS_COMPILE:%-=%)) 701GCC_TOOLCHAIN := $(realpath $(dir $(shell which $(LD)))/..) 702endif 703ifneq ($(GCC_TOOLCHAIN),) 704CLANG_GCC_TC := -gcc-toolchain $(GCC_TOOLCHAIN) 705endif 706KBUILD_CFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC) 707KBUILD_AFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC) 708KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,) 709KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable) 710KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier) 711KBUILD_CFLAGS += $(call cc-disable-warning, gnu) 712KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) 713# Quiet clang warning: comparison of unsigned expression < 0 is always false 714KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare) 715# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the 716# source of a reference will be _MergedGlobals and not on of the whitelisted names. 717# See modpost pattern 2 718KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,) 719KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior) 720KBUILD_CFLAGS += $(call cc-option, -no-integrated-as) 721KBUILD_AFLAGS += $(call cc-option, -no-integrated-as) 722else 723 724# These warnings generated too much noise in a regular build. 725# Use make W=1 to enable them (see scripts/Makefile.extrawarn) 726KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable) 727KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) 728endif 729 730ifdef CONFIG_FRAME_POINTER 731KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 732else 733# Some targets (ARM with Thumb2, for example), can't be built with frame 734# pointers. For those, we don't have FUNCTION_TRACER automatically 735# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 736# incompatible with -fomit-frame-pointer with current GCC, so we don't use 737# -fomit-frame-pointer with FUNCTION_TRACER. 738ifndef CONFIG_FUNCTION_TRACER 739KBUILD_CFLAGS += -fomit-frame-pointer 740endif 741endif 742 743KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments) 744 745ifdef CONFIG_DEBUG_INFO 746ifdef CONFIG_DEBUG_INFO_SPLIT 747KBUILD_CFLAGS += $(call cc-option, -gsplit-dwarf, -g) 748else 749KBUILD_CFLAGS += -g 750endif 751KBUILD_AFLAGS += -Wa,-gdwarf-2 752endif 753ifdef CONFIG_DEBUG_INFO_DWARF4 754KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,) 755endif 756 757ifdef CONFIG_DEBUG_INFO_REDUCED 758KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \ 759 $(call cc-option,-fno-var-tracking) 760endif 761 762ifdef CONFIG_FUNCTION_TRACER 763ifndef CC_FLAGS_FTRACE 764CC_FLAGS_FTRACE := -pg 765endif 766export CC_FLAGS_FTRACE 767ifdef CONFIG_HAVE_FENTRY 768CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY) 769endif 770KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY) 771KBUILD_AFLAGS += $(CC_USING_FENTRY) 772ifdef CONFIG_DYNAMIC_FTRACE 773 ifdef CONFIG_HAVE_C_RECORDMCOUNT 774 BUILD_C_RECORDMCOUNT := y 775 export BUILD_C_RECORDMCOUNT 776 endif 777endif 778endif 779 780# We trigger additional mismatches with less inlining 781ifdef CONFIG_DEBUG_SECTION_MISMATCH 782KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) 783endif 784 785ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 786KBUILD_CFLAGS += $(call cc-option,-ffunction-sections,) 787KBUILD_CFLAGS += $(call cc-option,-fdata-sections,) 788endif 789 790# arch Makefile may override CC so keep this after arch Makefile is included 791NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) 792CHECKFLAGS += $(NOSTDINC_FLAGS) 793 794# warn about C99 declaration after statement 795KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,) 796 797# disable pointer signed / unsigned warnings in gcc 4.0 798KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign) 799 800# disable invalid "can't wrap" optimizations for signed / pointers 801KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow) 802 803# conserve stack if available 804KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) 805 806# disallow errors like 'EXPORT_GPL(foo);' with missing header 807KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int) 808 809# require functions to have arguments in prototypes, not empty 'int foo()' 810KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes) 811 812# Prohibit date/time macros, which would make the build non-deterministic 813KBUILD_CFLAGS += $(call cc-option,-Werror=date-time) 814 815# enforce correct pointer usage 816KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 817 818# Require designated initializers for all marked structures 819KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) 820 821# use the deterministic mode of AR if available 822KBUILD_ARFLAGS := $(call ar-option,D) 823 824include scripts/Makefile.kasan 825include scripts/Makefile.extrawarn 826include scripts/Makefile.ubsan 827 828# Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the 829# last assignments 830KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS) 831KBUILD_AFLAGS += $(ARCH_AFLAGS) $(KAFLAGS) 832KBUILD_CFLAGS += $(ARCH_CFLAGS) $(KCFLAGS) 833 834# Use --build-id when available. 835LDFLAGS_BUILD_ID := $(patsubst -Wl$(comma)%,%,\ 836 $(call cc-ldoption, -Wl$(comma)--build-id,)) 837KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID) 838LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID) 839 840ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 841LDFLAGS_vmlinux += $(call ld-option, --gc-sections,) 842endif 843 844ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 845LDFLAGS_vmlinux += $(call ld-option, -X,) 846endif 847 848# Default kernel image to build when no specific target is given. 849# KBUILD_IMAGE may be overruled on the command line or 850# set in the environment 851# Also any assignments in arch/$(ARCH)/Makefile take precedence over 852# this default value 853export KBUILD_IMAGE ?= vmlinux 854 855# 856# INSTALL_PATH specifies where to place the updated kernel and system map 857# images. Default is /boot, but you can set it to other values 858export INSTALL_PATH ?= /boot 859 860# 861# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 862# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 863# an argument if needed. Otherwise it defaults to the kernel install path 864# 865export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 866 867# 868# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 869# relocations required by build roots. This is not defined in the 870# makefile but the argument can be passed to make if needed. 871# 872 873MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 874export MODLIB 875 876# 877# INSTALL_MOD_STRIP, if defined, will cause modules to be 878# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then 879# the default option --strip-debug will be used. Otherwise, 880# INSTALL_MOD_STRIP value will be used as the options to the strip command. 881 882ifdef INSTALL_MOD_STRIP 883ifeq ($(INSTALL_MOD_STRIP),1) 884mod_strip_cmd = $(STRIP) --strip-debug 885else 886mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP) 887endif # INSTALL_MOD_STRIP=1 888else 889mod_strip_cmd = true 890endif # INSTALL_MOD_STRIP 891export mod_strip_cmd 892 893# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed 894# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP 895# or CONFIG_MODULE_COMPRESS_XZ. 896 897mod_compress_cmd = true 898ifdef CONFIG_MODULE_COMPRESS 899 ifdef CONFIG_MODULE_COMPRESS_GZIP 900 mod_compress_cmd = gzip -n -f 901 endif # CONFIG_MODULE_COMPRESS_GZIP 902 ifdef CONFIG_MODULE_COMPRESS_XZ 903 mod_compress_cmd = xz -f 904 endif # CONFIG_MODULE_COMPRESS_XZ 905endif # CONFIG_MODULE_COMPRESS 906export mod_compress_cmd 907 908# Select initial ramdisk compression format, default is gzip(1). 909# This shall be used by the dracut(8) tool while creating an initramfs image. 910# 911INITRD_COMPRESS-y := gzip 912INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2 913INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma 914INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz 915INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo 916INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4 917# do not export INITRD_COMPRESS, since we didn't actually 918# choose a sane default compression above. 919# export INITRD_COMPRESS := $(INITRD_COMPRESS-y) 920 921ifdef CONFIG_MODULE_SIG_ALL 922$(eval $(call config_filename,MODULE_SIG_KEY)) 923 924mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509 925else 926mod_sign_cmd = true 927endif 928export mod_sign_cmd 929 930ifdef CONFIG_STACK_VALIDATION 931 has_libelf := $(call try-run,\ 932 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0) 933 ifeq ($(has_libelf),1) 934 objtool_target := tools/objtool FORCE 935 else 936 $(warning "Cannot use CONFIG_STACK_VALIDATION, please install libelf-dev, libelf-devel or elfutils-libelf-devel") 937 SKIP_STACK_VALIDATION := 1 938 export SKIP_STACK_VALIDATION 939 endif 940endif 941 942 943ifeq ($(KBUILD_EXTMOD),) 944core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/ 945 946vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \ 947 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 948 $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y))) 949 950vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \ 951 $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-)))) 952 953init-y := $(patsubst %/, %/built-in.o, $(init-y)) 954core-y := $(patsubst %/, %/built-in.o, $(core-y)) 955drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y)) 956net-y := $(patsubst %/, %/built-in.o, $(net-y)) 957libs-y1 := $(patsubst %/, %/lib.a, $(libs-y)) 958libs-y2 := $(filter-out %.a, $(patsubst %/, %/built-in.o, $(libs-y))) 959virt-y := $(patsubst %/, %/built-in.o, $(virt-y)) 960 961# Externally visible symbols (used by link-vmlinux.sh) 962export KBUILD_VMLINUX_INIT := $(head-y) $(init-y) 963export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y2) $(drivers-y) $(net-y) $(virt-y) 964export KBUILD_VMLINUX_LIBS := $(libs-y1) 965export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 966export LDFLAGS_vmlinux 967# used by scripts/package/Makefile 968export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools) 969 970vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) $(KBUILD_VMLINUX_LIBS) 971 972# Include targets which we want to execute sequentially if the rest of the 973# kernel build went well. If CONFIG_TRIM_UNUSED_KSYMS is set, this might be 974# evaluated more than once. 975PHONY += vmlinux_prereq 976vmlinux_prereq: $(vmlinux-deps) FORCE 977ifdef CONFIG_HEADERS_CHECK 978 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check 979endif 980ifdef CONFIG_GDB_SCRIPTS 981 $(Q)ln -fsn `cd $(srctree) && /bin/pwd`/scripts/gdb/vmlinux-gdb.py 982endif 983ifdef CONFIG_TRIM_UNUSED_KSYMS 984 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ 985 "$(MAKE) -f $(srctree)/Makefile vmlinux" 986endif 987 988# standalone target for easier testing 989include/generated/autoksyms.h: FORCE 990 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh true 991 992ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink) 993 994# Final link of vmlinux with optional arch pass after final link 995cmd_link-vmlinux = \ 996 $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) ; \ 997 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) 998 999vmlinux: scripts/link-vmlinux.sh vmlinux_prereq $(vmlinux-deps) FORCE 1000 +$(call if_changed,link-vmlinux)
1001 1002# Build samples along the rest of the kernel 1003ifdef CONFIG_SAMPLES 1004vmlinux-dirs += samples 1005endif 1006 1007# The actual objects are generated when descending, 1008# make sure no implicit rule kicks in 1009$(sort $(vmlinux-deps)): $(vmlinux-dirs) ; 1010 1011# Handle descending into subdirectories listed in $(vmlinux-dirs) 1012# Preset locale variables to speed up the build process. Limit locale 1013# tweaks to this spot to avoid wrong language settings when running 1014# make menuconfig etc. 1015# Error messages still appears in the original language 1016 1017PHONY += $(vmlinux-dirs) 1018$(vmlinux-dirs): prepare scripts 1019 $(Q)$(MAKE) $(build)=$@ 1020 1021define filechk_kernel.release 1022 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1023endef 1024 1025# Store (new) KERNELRELEASE string in include/config/kernel.release 1026include/config/kernel.release: include/config/auto.conf FORCE 1027 $(call filechk,kernel.release) 1028 1029 1030# Things we need to do before we recursively start building the kernel 1031# or the modules are listed in "prepare". 1032# A multi level approach is used. prepareN is processed before prepareN-1. 1033# archprepare is used in arch Makefiles and when processed asm symlink, 1034# version.h and scripts_basic is processed / created. 1035 1036# Listed in dependency order 1037PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3 1038 1039# prepare3 is used to check if we are building in a separate output directory, 1040# and if so do: 1041# 1) Check that make has not been executed in the kernel src $(srctree) 1042prepare3: include/config/kernel.release 1043ifneq ($(KBUILD_SRC),) 1044 @$(kecho) ' Using $(srctree) as source for kernel' 1045 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \ 1046 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \ 1047 echo >&2 " in the '$(srctree)' directory.";\ 1048 /bin/false; \ 1049 fi; 1050endif 1051 1052# prepare2 creates a makefile if using a separate output directory. 1053# From this point forward, .config has been reprocessed, so any rules 1054# that need to depend on updated CONFIG_* values can be checked here. 1055prepare2: prepare3 prepare-compiler-check outputmakefile asm-generic 1056 1057prepare1: prepare2 $(version_h) include/generated/utsrelease.h \ 1058 include/config/auto.conf 1059 $(cmd_crmodverdir) 1060 1061archprepare: archheaders archscripts prepare1 scripts_basic 1062 1063prepare0: archprepare gcc-plugins 1064 $(Q)$(MAKE) $(build)=. 1065 1066# All the preparing.. 1067prepare: prepare0 prepare-objtool 1068 1069PHONY += prepare-objtool 1070prepare-objtool: $(objtool_target) 1071 1072# Check for CONFIG flags that require compiler support. Abort the build 1073# after .config has been processed, but before the kernel build starts. 1074# 1075# For security-sensitive CONFIG options, we don't want to fallback and/or 1076# silently change which compiler flags will be used, since that leads to 1077# producing kernels with different security feature characteristics 1078# depending on the compiler used. (For example, "But I selected 1079# CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!") 1080PHONY += prepare-compiler-check 1081prepare-compiler-check: FORCE 1082# Make sure compiler supports requested stack protector flag. 1083ifdef stackp-name 1084 ifeq ($(call cc-option, $(stackp-flag)),) 1085 @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \ 1086 $(stackp-flag) not supported by compiler >&2 && exit 1 1087 endif 1088endif 1089# Make sure compiler does not have buggy stack-protector support. 1090ifdef stackp-check 1091 ifneq ($(shell $(CONFIG_SHELL) $(stackp-check) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y) 1092 @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \ 1093 $(stackp-flag) available but compiler is broken >&2 && exit 1 1094 endif 1095endif 1096 @: 1097 1098# Generate some files 1099# --------------------------------------------------------------------------- 1100 1101# KERNELRELEASE can change from a few different places, meaning version.h 1102# needs to be updated, so this check is forced on all builds 1103 1104uts_len := 64 1105define filechk_utsrelease.h 1106 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1107 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1108 exit 1; \ 1109 fi; \ 1110 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";) 1111endef 1112 1113define filechk_version.h 1114 (echo \#define LINUX_VERSION_CODE $(shell \ 1115 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \ 1116 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';) 1117endef 1118 1119$(version_h): $(srctree)/Makefile FORCE 1120 $(call filechk,version.h) 1121 $(Q)rm -f $(old_version_h) 1122 1123include/generated/utsrelease.h: include/config/kernel.release FORCE 1124 $(call filechk,utsrelease.h) 1125 1126PHONY += headerdep 1127headerdep: 1128 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1129 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1130 1131# --------------------------------------------------------------------------- 1132# Firmware install 1133INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware 1134export INSTALL_FW_PATH 1135 1136PHONY += firmware_install 1137firmware_install: 1138 @mkdir -p $(objtree)/firmware 1139 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install 1140 1141# --------------------------------------------------------------------------- 1142# Kernel headers 1143 1144#Default location for installed headers 1145export INSTALL_HDR_PATH = $(objtree)/usr 1146 1147# If we do an all arch process set dst to include/arch-$(hdr-arch) 1148hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(hdr-arch), dst=include) 1149 1150PHONY += archheaders 1151archheaders: 1152 1153PHONY += archscripts 1154archscripts: 1155 1156PHONY += __headers 1157__headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts 1158 $(Q)$(MAKE) $(build)=scripts build_unifdef 1159 1160PHONY += headers_install_all 1161headers_install_all: 1162 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install 1163 1164PHONY += headers_install 1165headers_install: __headers 1166 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \ 1167 $(error Headers not exportable for the $(SRCARCH) architecture)) 1168 $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include 1169 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi $(hdr-dst) 1170 1171PHONY += headers_check_all 1172headers_check_all: headers_install_all 1173 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check 1174 1175PHONY += headers_check 1176headers_check: headers_install 1177 $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1 1178 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi $(hdr-dst) HDRCHECK=1 1179 1180# --------------------------------------------------------------------------- 1181# Kernel selftest 1182 1183PHONY += kselftest 1184kselftest: 1185 $(Q)$(MAKE) -C tools/testing/selftests run_tests 1186 1187PHONY += kselftest-clean 1188kselftest-clean: 1189 $(Q)$(MAKE) -C tools/testing/selftests clean 1190 1191PHONY += kselftest-merge 1192kselftest-merge: 1193 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1194 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \ 1195 -m $(objtree)/.config \ 1196 $(srctree)/tools/testing/selftests/*/config 1197 +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1198 1199# --------------------------------------------------------------------------- 1200# Modules 1201 1202ifdef CONFIG_MODULES 1203 1204# By default, build modules as well 1205 1206all: modules 1207 1208# Build modules 1209# 1210# A module can be listed more than once in obj-m resulting in 1211# duplicate lines in modules.order files. Those are removed 1212# using awk while concatenating to the final file. 1213 1214PHONY += modules 1215modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin 1216 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order 1217 @$(kecho) ' Building modules, stage 2.'; 1218 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1219 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild 1220 1221modules.builtin: $(vmlinux-dirs:%=%/modules.builtin) 1222 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin 1223 1224%/modules.builtin: include/config/auto.conf 1225 $(Q)$(MAKE) $(modbuiltin)=$* 1226 1227 1228# Target to prepare building external modules 1229PHONY += modules_prepare 1230modules_prepare: prepare scripts 1231 1232# Target to install modules 1233PHONY += modules_install 1234modules_install: _modinst_ _modinst_post 1235 1236PHONY += _modinst_ 1237_modinst_: 1238 @rm -rf $(MODLIB)/kernel 1239 @rm -f $(MODLIB)/source 1240 @mkdir -p $(MODLIB)/kernel 1241 @ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source 1242 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1243 rm -f $(MODLIB)/build ; \ 1244 ln -s $(CURDIR) $(MODLIB)/build ; \ 1245 fi 1246 @cp -f $(objtree)/modules.order $(MODLIB)/ 1247 @cp -f $(objtree)/modules.builtin $(MODLIB)/ 1248 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1249 1250# This depmod is only for convenience to give the initial 1251# boot a modules.dep even before / is mounted read-write. However the 1252# boot script depmod is the master version. 1253PHONY += _modinst_post 1254_modinst_post: _modinst_ 1255 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst 1256 $(call cmd,depmod) 1257 1258ifeq ($(CONFIG_MODULE_SIG), y) 1259PHONY += modules_sign 1260modules_sign: 1261 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign 1262endif 1263 1264else # CONFIG_MODULES 1265 1266# Modules not configured 1267# --------------------------------------------------------------------------- 1268 1269PHONY += modules modules_install 1270modules modules_install: 1271 @echo >&2 1272 @echo >&2 "The present kernel configuration has modules disabled." 1273 @echo >&2 "Type 'make config' and enable loadable module support." 1274 @echo >&2 "Then build a kernel with module support enabled." 1275 @echo >&2 1276 @exit 1 1277 1278endif # CONFIG_MODULES 1279 1280### 1281# Cleaning is done on three levels. 1282# make clean Delete most generated files 1283# Leave enough to build external modules 1284# make mrproper Delete the current configuration, and all generated files 1285# make distclean Remove editor backup files, patch leftover files and the like 1286 1287# Directories & files removed with 'make clean' 1288CLEAN_DIRS += $(MODVERDIR) 1289 1290# Directories & files removed with 'make mrproper' 1291MRPROPER_DIRS += include/config usr/include include/generated \ 1292 arch/*/include/generated .tmp_objdiff 1293MRPROPER_FILES += .config .config.old .version .old_version \ 1294 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \ 1295 signing_key.pem signing_key.priv signing_key.x509 \ 1296 x509.genkey extra_certificates signing_key.x509.keyid \ 1297 signing_key.x509.signer vmlinux-gdb.py 1298 1299# clean - Delete most, but leave enough to build external modules 1300# 1301clean: rm-dirs := $(CLEAN_DIRS) 1302clean: rm-files := $(CLEAN_FILES) 1303clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples) 1304 1305PHONY += $(clean-dirs) clean archclean vmlinuxclean 1306$(clean-dirs): 1307 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1308 1309vmlinuxclean: 1310 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1311 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1312 1313clean: archclean vmlinuxclean 1314 1315# mrproper - Delete all generated files, including .config 1316# 1317mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS)) 1318mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1319mrproper-dirs := $(addprefix _mrproper_,scripts) 1320 1321PHONY += $(mrproper-dirs) mrproper archmrproper 1322$(mrproper-dirs): 1323 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1324 1325mrproper: clean archmrproper $(mrproper-dirs) 1326 $(call cmd,rmdirs) 1327 $(call cmd,rmfiles) 1328 1329# distclean 1330# 1331PHONY += distclean 1332 1333distclean: mrproper 1334 @find $(srctree) $(RCS_FIND_IGNORE) \ 1335 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1336 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1337 -o -name 'core' \) \ 1338 -type f -print | xargs rm -f 1339 1340 1341# Packaging of the kernel to various formats 1342# --------------------------------------------------------------------------- 1343# rpm target kept for backward compatibility 1344package-dir := scripts/package 1345 1346%src-pkg: FORCE 1347 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1348%pkg: include/config/kernel.release FORCE 1349 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1350rpm: include/config/kernel.release FORCE 1351 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1352 1353 1354# Brief documentation of the typical targets used 1355# --------------------------------------------------------------------------- 1356 1357boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1358boards := $(sort $(notdir $(boards))) 1359board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1360board-dirs := $(sort $(notdir $(board-dirs:/=))) 1361 1362PHONY += help 1363help: 1364 @echo 'Cleaning targets:' 1365 @echo ' clean - Remove most generated files but keep the config and' 1366 @echo ' enough build support to build external modules' 1367 @echo ' mrproper - Remove all generated files + config + various backup files' 1368 @echo ' distclean - mrproper + remove editor backup and patch files' 1369 @echo '' 1370 @echo 'Configuration targets:' 1371 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1372 @echo '' 1373 @echo 'Other generic targets:' 1374 @echo ' all - Build all targets marked with [*]' 1375 @echo '* vmlinux - Build the bare kernel' 1376 @echo '* modules - Build all modules' 1377 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1378 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH' 1379 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)' 1380 @echo ' dir/ - Build all files in dir and below' 1381 @echo ' dir/file.[ois] - Build specified target only' 1382 @echo ' dir/file.ll - Build the LLVM assembly file' 1383 @echo ' (requires compiler support for LLVM assembly generation)' 1384 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1385 @echo ' (requires a recent binutils and recent build (System.map))' 1386 @echo ' dir/file.ko - Build module including final link' 1387 @echo ' modules_prepare - Set up for building external modules' 1388 @echo ' tags/TAGS - Generate tags file for editors' 1389 @echo ' cscope - Generate cscope index' 1390 @echo ' gtags - Generate GNU GLOBAL index' 1391 @echo ' kernelrelease - Output the release version string (use with make -s)' 1392 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1393 @echo ' image_name - Output the image name (use with make -s)' 1394 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1395 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1396 echo '' 1397 @echo 'Static analysers:' 1398 @echo ' checkstack - Generate a list of stack hogs' 1399 @echo ' namespacecheck - Name space analysis on compiled kernel' 1400 @echo ' versioncheck - Sanity check on version.h usage' 1401 @echo ' includecheck - Check for duplicate included header files' 1402 @echo ' export_report - List the usages of all exported symbols' 1403 @echo ' headers_check - Sanity check on exported headers' 1404 @echo ' headerdep - Detect inclusion cycles in headers' 1405 @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help 1406 @echo '' 1407 @echo 'Kernel selftest:' 1408 @echo ' kselftest - Build and run kernel selftest (run as root)' 1409 @echo ' Build, install, and boot kernel before' 1410 @echo ' running kselftest on it' 1411 @echo ' kselftest-clean - Remove all generated kselftest files' 1412 @echo ' kselftest-merge - Merge all the config dependencies of kselftest to existed' 1413 @echo ' .config.' 1414 @echo '' 1415 @echo 'Userspace tools targets:' 1416 @echo ' use "make tools/help"' 1417 @echo ' or "cd tools; make help"' 1418 @echo '' 1419 @echo 'Kernel packaging:' 1420 @$(MAKE) $(build)=$(package-dir) help 1421 @echo '' 1422 @echo 'Documentation targets:' 1423 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1424 @echo '' 1425 @echo 'Architecture specific targets ($(SRCARCH)):' 1426 @$(if $(archhelp),$(archhelp),\ 1427 echo ' No architecture specific help defined for $(SRCARCH)') 1428 @echo '' 1429 @$(if $(boards), \ 1430 $(foreach b, $(boards), \ 1431 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1432 echo '') 1433 @$(if $(board-dirs), \ 1434 $(foreach b, $(board-dirs), \ 1435 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1436 printf " %-16s - Show all of the above\\n" help-boards; \ 1437 echo '') 1438 1439 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1440 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1441 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1442 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK (sparse by default)' 1443 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1444 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1445 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where' 1446 @echo ' 1: warnings which may be relevant and do not occur too often' 1447 @echo ' 2: warnings which occur quite often but may still be relevant' 1448 @echo ' 3: more obscure warnings, can most likely be ignored' 1449 @echo ' Multiple levels can be combined with W=12 or W=123' 1450 @echo '' 1451 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1452 @echo 'For further info see the ./README file' 1453 1454 1455help-board-dirs := $(addprefix help-,$(board-dirs)) 1456 1457help-boards: $(help-board-dirs) 1458 1459boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1460 1461$(help-board-dirs): help-%: 1462 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1463 @$(if $(boards-per-dir), \ 1464 $(foreach b, $(boards-per-dir), \ 1465 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1466 echo '') 1467 1468 1469# Documentation targets 1470# --------------------------------------------------------------------------- 1471DOC_TARGETS := xmldocs sgmldocs psdocs latexdocs pdfdocs htmldocs mandocs installmandocs epubdocs cleandocs linkcheckdocs 1472PHONY += $(DOC_TARGETS) 1473$(DOC_TARGETS): scripts_basic FORCE 1474 $(Q)$(MAKE) $(build)=Documentation $@ 1475 1476else # KBUILD_EXTMOD 1477 1478### 1479# External module support. 1480# When building external modules the kernel used as basis is considered 1481# read-only, and no consistency checks are made and the make 1482# system is not used on the basis kernel. If updates are required 1483# in the basis kernel ordinary make commands (without M=...) must 1484# be used. 1485# 1486# The following are the only valid targets when building external 1487# modules. 1488# make M=dir clean Delete all automatically generated files 1489# make M=dir modules Make all modules in specified dir 1490# make M=dir Same as 'make M=dir modules' 1491# make M=dir modules_install 1492# Install the modules built in the module directory 1493# Assumes install directory is already created 1494 1495# We are always building modules 1496KBUILD_MODULES := 1 1497PHONY += crmodverdir 1498crmodverdir: 1499 $(cmd_crmodverdir) 1500 1501PHONY += $(objtree)/Module.symvers 1502$(objtree)/Module.symvers: 1503 @test -e $(objtree)/Module.symvers || ( \ 1504 echo; \ 1505 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \ 1506 echo " is missing; modules will have no dependencies and modversions."; \ 1507 echo ) 1508 1509module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD)) 1510PHONY += $(module-dirs) modules 1511$(module-dirs): crmodverdir $(objtree)/Module.symvers 1512 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@) 1513 1514modules: $(module-dirs) 1515 @$(kecho) ' Building modules, stage 2.'; 1516 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1517 1518PHONY += modules_install 1519modules_install: _emodinst_ _emodinst_post 1520 1521install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra) 1522PHONY += _emodinst_ 1523_emodinst_: 1524 $(Q)mkdir -p $(MODLIB)/$(install-dir) 1525 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1526 1527PHONY += _emodinst_post 1528_emodinst_post: _emodinst_ 1529 $(call cmd,depmod) 1530 1531clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD)) 1532 1533PHONY += $(clean-dirs) clean 1534$(clean-dirs): 1535 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1536 1537clean: rm-dirs := $(MODVERDIR) 1538clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers 1539 1540PHONY += help 1541help: 1542 @echo ' Building external modules.' 1543 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1544 @echo '' 1545 @echo ' modules - default target, build the module(s)' 1546 @echo ' modules_install - install the module' 1547 @echo ' clean - remove generated files in module directory only' 1548 @echo '' 1549 1550# Dummies... 1551PHONY += prepare scripts 1552prepare: ; 1553scripts: ; 1554endif # KBUILD_EXTMOD 1555 1556clean: $(clean-dirs) 1557 $(call cmd,rmdirs) 1558 $(call cmd,rmfiles) 1559 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1560 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \ 1561 -o -name '*.ko.*' \ 1562 -o -name '*.dwo' \ 1563 -o -name '*.su' \ 1564 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1565 -o -name '*.symtypes' -o -name 'modules.order' \ 1566 -o -name modules.builtin -o -name '.tmp_*.o.*' \ 1567 -o -name '*.c.[012]*.*' \ 1568 -o -name '*.ll' \ 1569 -o -name '*.gcno' \) -type f -print | xargs rm -f 1570 1571# Generate tags for editors 1572# --------------------------------------------------------------------------- 1573quiet_cmd_tags = GEN $@ 1574 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@ 1575 1576tags TAGS cscope gtags: FORCE 1577 $(call cmd,tags) 1578 1579# Scripts to check various things for consistency 1580# --------------------------------------------------------------------------- 1581 1582PHONY += includecheck versioncheck coccicheck namespacecheck export_report 1583 1584includecheck: 1585 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1586 -name '*.[hcS]' -type f -print | sort \ 1587 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1588 1589versioncheck: 1590 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1591 -name '*.[hcS]' -type f -print | sort \ 1592 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1593 1594coccicheck: 1595 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@ 1596 1597namespacecheck: 1598 $(PERL) $(srctree)/scripts/namespace.pl 1599 1600export_report: 1601 $(PERL) $(srctree)/scripts/export_report.pl 1602 1603endif #ifeq ($(config-targets),1) 1604endif #ifeq ($(mixed-targets),1) 1605 1606PHONY += checkstack kernelrelease kernelversion image_name 1607 1608# UML needs a little special treatment here. It wants to use the host 1609# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1610# else wants $(ARCH), including people doing cross-builds, which means 1611# that $(SUBARCH) doesn't work here. 1612ifeq ($(ARCH), um) 1613CHECKSTACK_ARCH := $(SUBARCH) 1614else 1615CHECKSTACK_ARCH := $(ARCH) 1616endif 1617checkstack: 1618 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1619 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1620 1621kernelrelease: 1622 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1623 1624kernelversion: 1625 @echo $(KERNELVERSION) 1626 1627image_name: 1628 @echo $(KBUILD_IMAGE) 1629 1630# Clear a bunch of variables before executing the submake 1631tools/: FORCE 1632 $(Q)mkdir -p $(objtree)/tools 1633 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/ 1634 1635tools/%: FORCE 1636 $(Q)mkdir -p $(objtree)/tools 1637 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/ $* 1638 1639# Single targets 1640# --------------------------------------------------------------------------- 1641# Single targets are compatible with: 1642# - build with mixed source and output 1643# - build with separate output dir 'make O=...' 1644# - external modules 1645# 1646# target-dir => where to store outputfile 1647# build-dir => directory in kernel source tree to use 1648 1649ifeq ($(KBUILD_EXTMOD),) 1650 build-dir = $(patsubst %/,%,$(dir $@)) 1651 target-dir = $(dir $@) 1652else 1653 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@))) 1654 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash)) 1655 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@)) 1656endif 1657 1658%.s: %.c prepare scripts FORCE 1659 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1660%.i: %.c prepare scripts FORCE 1661 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1662%.o: %.c prepare scripts FORCE 1663 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1664%.lst: %.c prepare scripts FORCE 1665 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1666%.s: %.S prepare scripts FORCE 1667 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1668%.o: %.S prepare scripts FORCE 1669 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1670%.symtypes: %.c prepare scripts FORCE 1671 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1672%.ll: %.c prepare scripts FORCE 1673 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1674 1675# Modules 1676/: prepare scripts FORCE 1677 $(cmd_crmodverdir) 1678 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1679 $(build)=$(build-dir) 1680# Make sure the latest headers are built for Documentation 1681Documentation/ samples/: headers_install 1682%/: prepare scripts FORCE 1683 $(cmd_crmodverdir) 1684 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1685 $(build)=$(build-dir) 1686%.ko: prepare scripts FORCE 1687 $(cmd_crmodverdir) 1688 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1689 $(build)=$(build-dir) $(@:.ko=.o) 1690 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1691 1692# FIXME Should go into a make.lib or something 1693# =========================================================================== 1694 1695quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs))) 1696 cmd_rmdirs = rm -rf $(rm-dirs) 1697 1698quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1699 cmd_rmfiles = rm -f $(rm-files) 1700 1701# Run depmod only if we have System.map and depmod is executable 1702quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) 1703 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1704 $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))" 1705 1706# Create temporary dir for module support files 1707# clean it up only when building all modules 1708cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \ 1709 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*) 1710 1711# read all saved command lines 1712 1713targets := $(wildcard $(sort $(targets))) 1714cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd)) 1715 1716ifneq ($(cmd_files),) 1717 $(cmd_files): ; # Do not try to update included dependency files 1718 include $(cmd_files) 1719endif 1720 1721endif # skip-makefile 1722 1723PHONY += FORCE 1724FORCE: 1725 1726# Declare the contents of the .PHONY variable as phony. We keep that 1727# information in a variable so we can use it in if_changed and friends. 1728.PHONY: $(PHONY) 1729