1# SPDX-License-Identifier: GPL-2.0 2VERSION = 4 3PATCHLEVEL = 15 4SUBLEVEL = 0 5EXTRAVERSION = 6NAME = Fearless Coyote 7 8# *DOCUMENTATION* 9# To see a list of typical targets execute "make help" 10# More info can be located in ./README 11# Comments in this file are targeted only to the developer, do not 12# expect to learn how to build the kernel reading this file. 13 14# That's our default target when none is given on the command line 15PHONY := _all 16_all: 17 18# o Do not use make's built-in rules and variables 19# (this increases performance and avoids hard-to-debug behaviour); 20# o Look for make include files relative to root of kernel src 21MAKEFLAGS += -rR --include-dir=$(CURDIR) 22 23# Avoid funny character set dependencies 24unexport LC_ALL 25LC_COLLATE=C 26LC_NUMERIC=C 27export LC_COLLATE LC_NUMERIC 28 29# Avoid interference with shell env settings 30unexport GREP_OPTIONS 31 32# We are using a recursive build, so we need to do a little thinking 33# to get the ordering right. 34# 35# Most importantly: sub-Makefiles should only ever modify files in 36# their own directory. If in some directory we have a dependency on 37# a file in another dir (which doesn't happen often, but it's often 38# unavoidable when linking the built-in.o targets which finally 39# turn into vmlinux), we will call a sub make in that other dir, and 40# after that we are sure that everything which is in that other dir 41# is now up to date. 42# 43# The only cases where we need to modify files which have global 44# effects are thus separated out and done before the recursive 45# descending is started. They are now explicitly listed as the 46# prepare rule. 47 48# Beautify output 49# --------------------------------------------------------------------------- 50# 51# Normally, we echo the whole command before executing it. By making 52# that echo $($(quiet)$(cmd)), we now have the possibility to set 53# $(quiet) to choose other forms of output instead, e.g. 54# 55# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@ 56# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< 57# 58# If $(quiet) is empty, the whole command will be printed. 59# If it is set to "quiet_", only the short version will be printed. 60# If it is set to "silent_", nothing will be printed at all, since 61# the variable $(silent_cmd_cc_o_c) doesn't exist. 62# 63# A simple variant is to prefix commands with $(Q) - that's useful 64# for commands that shall be hidden in non-verbose mode. 65# 66# $(Q)ln $@ :< 67# 68# If KBUILD_VERBOSE equals 0 then the above command will be hidden. 69# If KBUILD_VERBOSE equals 1 then the above command is displayed. 70# 71# To put more focus on warnings, be less verbose as default 72# Use 'make V=1' to see the full commands 73 74ifeq ("$(origin V)", "command line") 75 KBUILD_VERBOSE = $(V) 76endif 77ifndef KBUILD_VERBOSE 78 KBUILD_VERBOSE = 0 79endif 80 81ifeq ($(KBUILD_VERBOSE),1) 82 quiet = 83 Q = 84else 85 quiet=quiet_ 86 Q = @ 87endif 88 89# If the user is running make -s (silent mode), suppress echoing of 90# commands 91 92ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),) 93 quiet=silent_ 94 tools_silent=s 95endif 96 97export quiet Q KBUILD_VERBOSE 98 99# kbuild supports saving output files in a separate directory. 100# To locate output files in a separate directory two syntaxes are supported. 101# In both cases the working directory must be the root of the kernel src. 102# 1) O= 103# Use "make O=dir/to/store/output/files/" 104# 105# 2) Set KBUILD_OUTPUT 106# Set the environment variable KBUILD_OUTPUT to point to the directory 107# where the output files shall be placed. 108# export KBUILD_OUTPUT=dir/to/store/output/files/ 109# make 110# 111# The O= assignment takes precedence over the KBUILD_OUTPUT environment 112# variable. 113 114# KBUILD_SRC is not intended to be used by the regular user (for now), 115# it is set on invocation of make with KBUILD_OUTPUT or O= specified. 116ifeq ($(KBUILD_SRC),) 117 118# OK, Make called in directory where kernel src resides 119# Do we want to locate output files in a separate directory? 120ifeq ("$(origin O)", "command line") 121 KBUILD_OUTPUT := $(O) 122endif 123 124# Cancel implicit rules on top Makefile 125$(CURDIR)/Makefile Makefile: ; 126 127ifneq ($(words $(subst :, ,$(CURDIR))), 1) 128 $(error main directory cannot contain spaces nor colons) 129endif 130 131ifneq ($(KBUILD_OUTPUT),) 132# check that the output directory actually exists 133saved-output := $(KBUILD_OUTPUT) 134KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \ 135 && pwd) 136$(if $(KBUILD_OUTPUT),, \ 137 $(error failed to create output directory "$(saved-output)")) 138 139PHONY += $(MAKECMDGOALS) sub-make 140 141$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make 142 @: 143 144# Invoke a second make in the output directory, passing relevant variables 145sub-make: 146 $(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \ 147 -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS)) 148 149# Leave processing to above invocation of make 150skip-makefile := 1 151endif # ifneq ($(KBUILD_OUTPUT),) 152endif # ifeq ($(KBUILD_SRC),) 153 154# We process the rest of the Makefile if this is the final invocation of make 155ifeq ($(skip-makefile),) 156 157# Do not print "Entering directory ...", 158# but we want to display it when entering to the output directory 159# so that IDEs/editors are able to understand relative filenames. 160MAKEFLAGS += --no-print-directory 161 162# Call a source code checker (by default, "sparse") as part of the 163# C compilation. 164# 165# Use 'make C=1' to enable checking of only re-compiled files. 166# Use 'make C=2' to enable checking of *all* source files, regardless 167# of whether they are re-compiled or not. 168# 169# See the file "Documentation/dev-tools/sparse.rst" for more details, 170# including where to get the "sparse" utility. 171 172ifeq ("$(origin C)", "command line") 173 KBUILD_CHECKSRC = $(C) 174endif 175ifndef KBUILD_CHECKSRC 176 KBUILD_CHECKSRC = 0 177endif 178 179# Use make M=dir to specify directory of external module to build 180# Old syntax make ... SUBDIRS=$PWD is still supported 181# Setting the environment variable KBUILD_EXTMOD take precedence 182ifdef SUBDIRS 183 KBUILD_EXTMOD ?= $(SUBDIRS) 184endif 185 186ifeq ("$(origin M)", "command line") 187 KBUILD_EXTMOD := $(M) 188endif 189 190ifeq ($(KBUILD_SRC),) 191 # building in the source tree 192 srctree := . 193else 194 ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR))) 195 # building in a subdirectory of the source tree 196 srctree := .. 197 else 198 srctree := $(KBUILD_SRC) 199 endif 200endif 201 202export KBUILD_CHECKSRC KBUILD_EXTMOD KBUILD_SRC 203 204objtree := . 205src := $(srctree) 206obj := $(objtree) 207 208VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD)) 209 210export srctree objtree VPATH 211 212# To make sure we do not include .config for any of the *config targets 213# catch them early, and hand them over to scripts/kconfig/Makefile 214# It is allowed to specify more targets when calling make, including 215# mixing *config targets and build targets. 216# For example 'make oldconfig all'. 217# Detect when mixed targets is specified, and make a second invocation 218# of make so .config is not included in this case either (for *config). 219 220version_h := include/generated/uapi/linux/version.h 221old_version_h := include/linux/version.h 222 223no-dot-config-targets := clean mrproper distclean \ 224 cscope gtags TAGS tags help% %docs check% coccicheck \ 225 $(version_h) headers_% archheaders archscripts \ 226 kernelversion %src-pkg 227 228config-targets := 0 229mixed-targets := 0 230dot-config := 1 231 232ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 233 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 234 dot-config := 0 235 endif 236endif 237 238ifeq ($(KBUILD_EXTMOD),) 239 ifneq ($(filter config %config,$(MAKECMDGOALS)),) 240 config-targets := 1 241 ifneq ($(words $(MAKECMDGOALS)),1) 242 mixed-targets := 1 243 endif 244 endif 245endif 246# install and modules_install need also be processed one by one 247ifneq ($(filter install,$(MAKECMDGOALS)),) 248 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 249 mixed-targets := 1 250 endif 251endif 252 253ifeq ($(mixed-targets),1) 254# =========================================================================== 255# We're called with mixed targets (*config and build targets). 256# Handle them one by one. 257 258PHONY += $(MAKECMDGOALS) __build_one_by_one 259 260$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one 261 @: 262 263__build_one_by_one: 264 $(Q)set -e; \ 265 for i in $(MAKECMDGOALS); do \ 266 $(MAKE) -f $(srctree)/Makefile $$i; \ 267 done 268 269else 270 271# We need some generic definitions (do not try to remake the file). 272scripts/Kbuild.include: ; 273include scripts/Kbuild.include 274 275# Read KERNELRELEASE from include/config/kernel.release (if it exists) 276KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null) 277KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 278export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 279 280# SUBARCH tells the usermode build what the underlying arch is. That is set 281# first, and if a usermode build is happening, the "ARCH=um" on the command 282# line overrides the setting of ARCH below. If a native build is happening, 283# then ARCH is assigned, getting whatever value it gets normally, and 284# SUBARCH is subsequently ignored. 285 286SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \ 287 -e s/sun4u/sparc64/ \ 288 -e s/arm.*/arm/ -e s/sa110/arm/ \ 289 -e s/s390x/s390/ -e s/parisc64/parisc/ \ 290 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \ 291 -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ \ 292 -e s/riscv.*/riscv/) 293 294# Cross compiling and selecting different set of gcc/bin-utils 295# --------------------------------------------------------------------------- 296# 297# When performing cross compilation for other architectures ARCH shall be set 298# to the target architecture. (See arch/* for the possibilities). 299# ARCH can be set during invocation of make: 300# make ARCH=ia64 301# Another way is to have ARCH set in the environment. 302# The default ARCH is the host where make is executed. 303 304# CROSS_COMPILE specify the prefix used for all executables used 305# during compilation. Only gcc and related bin-utils executables 306# are prefixed with $(CROSS_COMPILE). 307# CROSS_COMPILE can be set on the command line 308# make CROSS_COMPILE=ia64-linux- 309# Alternatively CROSS_COMPILE can be set in the environment. 310# A third alternative is to store a setting in .config so that plain 311# "make" in the configured kernel build directory always uses that. 312# Default value for CROSS_COMPILE is not to prefix executables 313# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 314ARCH ?= $(SUBARCH) 315CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%) 316 317# Architecture as present in compile.h 318UTS_MACHINE := $(ARCH) 319SRCARCH := $(ARCH) 320 321# Additional ARCH settings for x86 322ifeq ($(ARCH),i386) 323 SRCARCH := x86 324endif 325ifeq ($(ARCH),x86_64) 326 SRCARCH := x86 327endif 328 329# Additional ARCH settings for sparc 330ifeq ($(ARCH),sparc32) 331 SRCARCH := sparc 332endif 333ifeq ($(ARCH),sparc64) 334 SRCARCH := sparc 335endif 336 337# Additional ARCH settings for sh 338ifeq ($(ARCH),sh64) 339 SRCARCH := sh 340endif 341 342# Additional ARCH settings for tile 343ifeq ($(ARCH),tilepro) 344 SRCARCH := tile 345endif 346ifeq ($(ARCH),tilegx) 347 SRCARCH := tile 348endif 349 350KCONFIG_CONFIG ?= .config 351export KCONFIG_CONFIG 352 353# SHELL used by kbuild 354CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \ 355 else if [ -x /bin/bash ]; then echo /bin/bash; \ 356 else echo sh; fi ; fi) 357 358HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS) 359HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS) 360HOST_LFS_LIBS := $(shell getconf LFS_LIBS) 361 362HOSTCC = gcc 363HOSTCXX = g++ 364HOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \ 365 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) 366HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS) 367HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) 368HOST_LOADLIBES := $(HOST_LFS_LIBS) 369 370# Make variables (CC, etc...) 371AS = $(CROSS_COMPILE)as 372LD = $(CROSS_COMPILE)ld 373CC = $(CROSS_COMPILE)gcc 374CPP = $(CC) -E 375AR = $(CROSS_COMPILE)ar 376NM = $(CROSS_COMPILE)nm 377STRIP = $(CROSS_COMPILE)strip 378OBJCOPY = $(CROSS_COMPILE)objcopy 379OBJDUMP = $(CROSS_COMPILE)objdump 380AWK = awk 381GENKSYMS = scripts/genksyms/genksyms 382INSTALLKERNEL := installkernel 383DEPMOD = /sbin/depmod 384PERL = perl 385PYTHON = python 386CHECK = sparse 387 388CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 389 -Wbitwise -Wno-return-void $(CF) 390NOSTDINC_FLAGS = 391CFLAGS_MODULE = 392AFLAGS_MODULE = 393LDFLAGS_MODULE = 394CFLAGS_KERNEL = 395AFLAGS_KERNEL = 396LDFLAGS_vmlinux = 397 398# Use USERINCLUDE when you must reference the UAPI directories only. 399USERINCLUDE := \ 400 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 401 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 402 -I$(srctree)/include/uapi \ 403 -I$(objtree)/include/generated/uapi \ 404 -include $(srctree)/include/linux/kconfig.h 405 406# Use LINUXINCLUDE when you must reference the include/ directory. 407# Needed to be compatible with the O= option 408LINUXINCLUDE := \ 409 -I$(srctree)/arch/$(SRCARCH)/include \ 410 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 411 $(if $(KBUILD_SRC), -I$(srctree)/include) \ 412 -I$(objtree)/include \ 413 $(USERINCLUDE) 414 415KBUILD_AFLAGS := -D__ASSEMBLY__ 416KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \ 417 -fno-strict-aliasing -fno-common -fshort-wchar \ 418 -Werror-implicit-function-declaration \ 419 -Wno-format-security \ 420 -std=gnu89 421KBUILD_CPPFLAGS := -D__KERNEL__ 422KBUILD_AFLAGS_KERNEL := 423KBUILD_CFLAGS_KERNEL := 424KBUILD_AFLAGS_MODULE := -DMODULE 425KBUILD_CFLAGS_MODULE := -DMODULE 426KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds 427GCC_PLUGINS_CFLAGS := 428 429export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC 430export CPP AR NM STRIP OBJCOPY OBJDUMP HOSTLDFLAGS HOST_LOADLIBES 431export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE 432export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS 433 434export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS 435export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_KASAN CFLAGS_UBSAN 436export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 437export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 438export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 439export KBUILD_ARFLAGS 440 441# When compiling out-of-tree modules, put MODVERDIR in the module 442# tree rather than in the kernel tree. The kernel tree might 443# even be read-only. 444export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions 445 446# Files to ignore in find ... statements 447 448export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 449 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 450 -prune -o 451export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 452 --exclude CVS --exclude .pc --exclude .hg --exclude .git 453 454# =========================================================================== 455# Rules shared between *config targets and build targets 456 457# Basic helpers built in scripts/basic/ 458PHONY += scripts_basic 459scripts_basic: 460 $(Q)$(MAKE) $(build)=scripts/basic 461 $(Q)rm -f .tmp_quiet_recordmcount 462 463# To avoid any implicit rule to kick in, define an empty command. 464scripts/basic/%: scripts_basic ; 465 466PHONY += outputmakefile 467# outputmakefile generates a Makefile in the output directory, if using a 468# separate output directory. This allows convenient use of make in the 469# output directory. 470outputmakefile: 471ifneq ($(KBUILD_SRC),) 472 $(Q)ln -fsn $(srctree) source 473 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \ 474 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL) 475endif 476 477ifeq ($(cc-name),clang) 478ifneq ($(CROSS_COMPILE),) 479CLANG_TARGET := --target=$(notdir $(CROSS_COMPILE:%-=%)) 480GCC_TOOLCHAIN := $(realpath $(dir $(shell which $(LD)))/..) 481endif 482ifneq ($(GCC_TOOLCHAIN),) 483CLANG_GCC_TC := --gcc-toolchain=$(GCC_TOOLCHAIN) 484endif 485KBUILD_CFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC) 486KBUILD_AFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC) 487endif 488 489ifeq ($(config-targets),1) 490# =========================================================================== 491# *config targets only - make sure prerequisites are updated, and descend 492# in scripts/kconfig to make the *config target 493 494# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 495# KBUILD_DEFCONFIG may point out an alternative default configuration 496# used for 'make defconfig' 497include arch/$(SRCARCH)/Makefile 498export KBUILD_DEFCONFIG KBUILD_KCONFIG 499 500config: scripts_basic outputmakefile FORCE 501 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 502 503%config: scripts_basic outputmakefile FORCE 504 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 505 506else 507# =========================================================================== 508# Build targets only - this includes vmlinux, arch specific targets, clean 509# targets and others. In general all targets except *config targets. 510 511# If building an external module we do not care about the all: rule 512# but instead _all depend on modules 513PHONY += all 514ifeq ($(KBUILD_EXTMOD),) 515_all: all 516else 517_all: modules 518endif 519 520# Decide whether to build built-in, modular, or both. 521# Normally, just do built-in. 522 523KBUILD_MODULES := 524KBUILD_BUILTIN := 1 525 526# If we have only "make modules", don't compile built-in objects. 527# When we're building modules with modversions, we need to consider 528# the built-in objects during the descend as well, in order to 529# make sure the checksums are up to date before we record them. 530 531ifeq ($(MAKECMDGOALS),modules) 532 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1) 533endif 534 535# If we have "make <whatever> modules", compile modules 536# in addition to whatever we do anyway. 537# Just "make" or "make all" shall build modules as well 538 539ifneq ($(filter all _all modules,$(MAKECMDGOALS)),) 540 KBUILD_MODULES := 1 541endif 542 543ifeq ($(MAKECMDGOALS),) 544 KBUILD_MODULES := 1 545endif 546 547export KBUILD_MODULES KBUILD_BUILTIN 548 549ifeq ($(KBUILD_EXTMOD),) 550# Additional helpers built in scripts/ 551# Carefully list dependencies so we do not try to build scripts twice 552# in parallel 553PHONY += scripts 554scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \ 555 asm-generic gcc-plugins 556 $(Q)$(MAKE) $(build)=$(@) 557 558# Objects we will link into vmlinux / subdirs we need to visit 559init-y := init/ 560drivers-y := drivers/ sound/ firmware/ 561net-y := net/ 562libs-y := lib/ 563core-y := usr/ 564virt-y := virt/ 565endif # KBUILD_EXTMOD 566 567ifeq ($(dot-config),1) 568# Read in config 569-include include/config/auto.conf 570 571ifeq ($(KBUILD_EXTMOD),) 572# Read in dependencies to all Kconfig* files, make sure to run 573# oldconfig if changes are detected. 574-include include/config/auto.conf.cmd 575 576# To avoid any implicit rule to kick in, define an empty command 577$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ; 578 579# If .config is newer than include/config/auto.conf, someone tinkered 580# with it and forgot to run make oldconfig. 581# if auto.conf.cmd is missing then we are probably in a cleaned tree so 582# we execute the config step to be sure to catch updated Kconfig files 583include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd 584 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig 585else 586# external modules needs include/generated/autoconf.h and include/config/auto.conf 587# but do not care if they are up-to-date. Use auto.conf to trigger the test 588PHONY += include/config/auto.conf 589 590include/config/auto.conf: 591 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 592 echo >&2; \ 593 echo >&2 " ERROR: Kernel configuration is invalid."; \ 594 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 595 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 596 echo >&2 ; \ 597 /bin/false) 598 599endif # KBUILD_EXTMOD 600 601else 602# Dummy target needed, because used as prerequisite 603include/config/auto.conf: ; 604endif # $(dot-config) 605 606# For the kernel to actually contain only the needed exported symbols, 607# we have to build modules as well to determine what those symbols are. 608# (this can be evaluated only once include/config/auto.conf has been included) 609ifdef CONFIG_TRIM_UNUSED_KSYMS 610 KBUILD_MODULES := 1 611endif 612 613# The all: target is the default when no target is given on the 614# command line. 615# This allow a user to issue only 'make' to build a kernel including modules 616# Defaults to vmlinux, but the arch makefile usually adds further targets 617all: vmlinux 618 619KBUILD_CFLAGS += $(call cc-option,-fno-PIE) 620KBUILD_AFLAGS += $(call cc-option,-fno-PIE) 621CFLAGS_GCOV := -fprofile-arcs -ftest-coverage -fno-tree-loop-im $(call cc-disable-warning,maybe-uninitialized,) 622export CFLAGS_GCOV CFLAGS_KCOV 623 624# The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default 625# values of the respective KBUILD_* variables 626ARCH_CPPFLAGS := 627ARCH_AFLAGS := 628ARCH_CFLAGS := 629include arch/$(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 += $(call cc-option,--param=allow-store-data-races=0) 653 654# check for 'asm goto' 655ifeq ($(call shell-cached,$(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.kcov 661include scripts/Makefile.gcc-plugins 662 663ifdef CONFIG_READABLE_ASM 664# Disable optimizations that make assembler listings hard to read. 665# reorder blocks reorders the control in the function 666# ipa clone creates specialized cloned functions 667# partial inlining inlines only parts of functions 668KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \ 669 $(call cc-option,-fno-ipa-cp-clone,) \ 670 $(call cc-option,-fno-partial-inlining) 671endif 672 673ifneq ($(CONFIG_FRAME_WARN),0) 674KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN}) 675endif 676 677# This selects the stack protector compiler flag. Testing it is delayed 678# until after .config has been reprocessed, in the prepare-compiler-check 679# target. 680ifdef CONFIG_CC_STACKPROTECTOR_REGULAR 681 stackp-flag := -fstack-protector 682 stackp-name := REGULAR 683else 684ifdef CONFIG_CC_STACKPROTECTOR_STRONG 685 stackp-flag := -fstack-protector-strong 686 stackp-name := STRONG 687else 688 # Force off for distro compilers that enable stack protector by default. 689 stackp-flag := $(call cc-option, -fno-stack-protector) 690endif 691endif 692# Find arch-specific stack protector compiler sanity-checking script. 693ifdef CONFIG_CC_STACKPROTECTOR 694 stackp-path := $(srctree)/scripts/gcc-$(SRCARCH)_$(BITS)-has-stack-protector.sh 695 stackp-check := $(wildcard $(stackp-path)) 696endif 697KBUILD_CFLAGS += $(stackp-flag) 698 699ifeq ($(cc-name),clang) 700KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,) 701KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable) 702KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier) 703KBUILD_CFLAGS += $(call cc-disable-warning, gnu) 704KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) 705# Quiet clang warning: comparison of unsigned expression < 0 is always false 706KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare) 707# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the 708# source of a reference will be _MergedGlobals and not on of the whitelisted names. 709# See modpost pattern 2 710KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,) 711KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior) 712KBUILD_CFLAGS += $(call cc-option, -no-integrated-as) 713KBUILD_AFLAGS += $(call cc-option, -no-integrated-as) 714else 715 716# These warnings generated too much noise in a regular build. 717# Use make W=1 to enable them (see scripts/Makefile.extrawarn) 718KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable) 719KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) 720endif 721 722ifdef CONFIG_FRAME_POINTER 723KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 724else 725# Some targets (ARM with Thumb2, for example), can't be built with frame 726# pointers. For those, we don't have FUNCTION_TRACER automatically 727# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 728# incompatible with -fomit-frame-pointer with current GCC, so we don't use 729# -fomit-frame-pointer with FUNCTION_TRACER. 730ifndef CONFIG_FUNCTION_TRACER 731KBUILD_CFLAGS += -fomit-frame-pointer 732endif 733endif 734 735KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments) 736 737ifdef CONFIG_DEBUG_INFO 738ifdef CONFIG_DEBUG_INFO_SPLIT 739KBUILD_CFLAGS += $(call cc-option, -gsplit-dwarf, -g) 740else 741KBUILD_CFLAGS += -g 742endif 743KBUILD_AFLAGS += -Wa,-gdwarf-2 744endif 745ifdef CONFIG_DEBUG_INFO_DWARF4 746KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,) 747endif 748 749ifdef CONFIG_DEBUG_INFO_REDUCED 750KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \ 751 $(call cc-option,-fno-var-tracking) 752endif 753 754ifdef CONFIG_FUNCTION_TRACER 755ifndef CC_FLAGS_FTRACE 756CC_FLAGS_FTRACE := -pg 757endif 758export CC_FLAGS_FTRACE 759ifdef CONFIG_HAVE_FENTRY 760CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY) 761endif 762KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY) 763KBUILD_AFLAGS += $(CC_USING_FENTRY) 764ifdef CONFIG_DYNAMIC_FTRACE 765 ifdef CONFIG_HAVE_C_RECORDMCOUNT 766 BUILD_C_RECORDMCOUNT := y 767 export BUILD_C_RECORDMCOUNT 768 endif 769endif 770endif 771 772# We trigger additional mismatches with less inlining 773ifdef CONFIG_DEBUG_SECTION_MISMATCH 774KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) 775endif 776 777ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 778KBUILD_CFLAGS += $(call cc-option,-ffunction-sections,) 779KBUILD_CFLAGS += $(call cc-option,-fdata-sections,) 780endif 781 782# arch Makefile may override CC so keep this after arch Makefile is included 783NOSTDINC_FLAGS += -nostdinc -isystem $(call shell-cached,$(CC) -print-file-name=include) 784CHECKFLAGS += $(NOSTDINC_FLAGS) 785 786# warn about C99 declaration after statement 787KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,) 788 789# disable pointer signed / unsigned warnings in gcc 4.0 790KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign) 791 792# disable invalid "can't wrap" optimizations for signed / pointers 793KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow) 794 795# Make sure -fstack-check isn't enabled (like gentoo apparently did) 796KBUILD_CFLAGS += $(call cc-option,-fno-stack-check,) 797 798# conserve stack if available 799KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) 800 801# disallow errors like 'EXPORT_GPL(foo);' with missing header 802KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int) 803 804# require functions to have arguments in prototypes, not empty 'int foo()' 805KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes) 806 807# Prohibit date/time macros, which would make the build non-deterministic 808KBUILD_CFLAGS += $(call cc-option,-Werror=date-time) 809 810# enforce correct pointer usage 811KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 812 813# Require designated initializers for all marked structures 814KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) 815 816# use the deterministic mode of AR if available 817KBUILD_ARFLAGS := $(call ar-option,D) 818 819include scripts/Makefile.kasan 820include scripts/Makefile.extrawarn 821include scripts/Makefile.ubsan 822 823# Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the 824# last assignments 825KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS) 826KBUILD_AFLAGS += $(ARCH_AFLAGS) $(KAFLAGS) 827KBUILD_CFLAGS += $(ARCH_CFLAGS) $(KCFLAGS) 828 829# Use --build-id when available. 830LDFLAGS_BUILD_ID := $(patsubst -Wl$(comma)%,%,\ 831 $(call cc-ldoption, -Wl$(comma)--build-id,)) 832KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID) 833LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID) 834 835ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 836LDFLAGS_vmlinux += $(call ld-option, --gc-sections,) 837endif 838 839ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 840LDFLAGS_vmlinux += $(call ld-option, -X,) 841endif 842 843# Default kernel image to build when no specific target is given. 844# KBUILD_IMAGE may be overruled on the command line or 845# set in the environment 846# Also any assignments in arch/$(ARCH)/Makefile take precedence over 847# this default value 848export KBUILD_IMAGE ?= vmlinux 849 850# 851# INSTALL_PATH specifies where to place the updated kernel and system map 852# images. Default is /boot, but you can set it to other values 853export INSTALL_PATH ?= /boot 854 855# 856# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 857# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 858# an argument if needed. Otherwise it defaults to the kernel install path 859# 860export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 861 862# 863# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 864# relocations required by build roots. This is not defined in the 865# makefile but the argument can be passed to make if needed. 866# 867 868MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 869export MODLIB 870 871# 872# INSTALL_MOD_STRIP, if defined, will cause modules to be 873# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then 874# the default option --strip-debug will be used. Otherwise, 875# INSTALL_MOD_STRIP value will be used as the options to the strip command. 876 877ifdef INSTALL_MOD_STRIP 878ifeq ($(INSTALL_MOD_STRIP),1) 879mod_strip_cmd = $(STRIP) --strip-debug 880else 881mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP) 882endif # INSTALL_MOD_STRIP=1 883else 884mod_strip_cmd = true 885endif # INSTALL_MOD_STRIP 886export mod_strip_cmd 887 888# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed 889# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP 890# or CONFIG_MODULE_COMPRESS_XZ. 891 892mod_compress_cmd = true 893ifdef CONFIG_MODULE_COMPRESS 894 ifdef CONFIG_MODULE_COMPRESS_GZIP 895 mod_compress_cmd = gzip -n -f 896 endif # CONFIG_MODULE_COMPRESS_GZIP 897 ifdef CONFIG_MODULE_COMPRESS_XZ 898 mod_compress_cmd = xz -f 899 endif # CONFIG_MODULE_COMPRESS_XZ 900endif # CONFIG_MODULE_COMPRESS 901export mod_compress_cmd 902 903# Select initial ramdisk compression format, default is gzip(1). 904# This shall be used by the dracut(8) tool while creating an initramfs image. 905# 906INITRD_COMPRESS-y := gzip 907INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2 908INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma 909INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz 910INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo 911INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4 912# do not export INITRD_COMPRESS, since we didn't actually 913# choose a sane default compression above. 914# export INITRD_COMPRESS := $(INITRD_COMPRESS-y) 915 916ifdef CONFIG_MODULE_SIG_ALL 917$(eval $(call config_filename,MODULE_SIG_KEY)) 918 919mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509 920else 921mod_sign_cmd = true 922endif 923export mod_sign_cmd 924 925ifdef CONFIG_STACK_VALIDATION 926 has_libelf := $(call try-run,\ 927 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0) 928 ifeq ($(has_libelf),1) 929 objtool_target := tools/objtool FORCE 930 else 931 ifdef CONFIG_UNWINDER_ORC 932 $(error "Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel") 933 else 934 $(warning "Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel") 935 endif 936 SKIP_STACK_VALIDATION := 1 937 export SKIP_STACK_VALIDATION 938 endif 939endif 940 941 942ifeq ($(KBUILD_EXTMOD),) 943core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/ 944 945vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \ 946 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 947 $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y))) 948 949vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \ 950 $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-)))) 951 952init-y := $(patsubst %/, %/built-in.o, $(init-y)) 953core-y := $(patsubst %/, %/built-in.o, $(core-y)) 954drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y)) 955net-y := $(patsubst %/, %/built-in.o, $(net-y)) 956libs-y1 := $(patsubst %/, %/lib.a, $(libs-y)) 957libs-y2 := $(filter-out %.a, $(patsubst %/, %/built-in.o, $(libs-y))) 958virt-y := $(patsubst %/, %/built-in.o, $(virt-y)) 959 960# Externally visible symbols (used by link-vmlinux.sh) 961export KBUILD_VMLINUX_INIT := $(head-y) $(init-y) 962export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y2) $(drivers-y) $(net-y) $(virt-y) 963export KBUILD_VMLINUX_LIBS := $(libs-y1) 964export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 965export LDFLAGS_vmlinux 966# used by scripts/package/Makefile 967export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools) 968 969vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) $(KBUILD_VMLINUX_LIBS) 970 971# Include targets which we want to execute sequentially if the rest of the 972# kernel build went well. If CONFIG_TRIM_UNUSED_KSYMS is set, this might be 973# evaluated more than once. 974PHONY += vmlinux_prereq 975vmlinux_prereq: $(vmlinux-deps) FORCE 976ifdef CONFIG_HEADERS_CHECK 977 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check 978endif 979ifdef CONFIG_GDB_SCRIPTS 980 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 981endif 982ifdef CONFIG_TRIM_UNUSED_KSYMS 983 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ 984 "$(MAKE) -f $(srctree)/Makefile vmlinux" 985endif 986 987# standalone target for easier testing 988include/generated/autoksyms.h: FORCE 989 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh true 990 991ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink) 992 993# Final link of vmlinux with optional arch pass after final link 994cmd_link-vmlinux = \ 995 $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) ; \ 996 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) 997 998vmlinux: scripts/link-vmlinux.sh vmlinux_prereq $(vmlinux-deps) FORCE 999 +$(call if_changed,link-vmlinux) 1000
1001# Build samples along the rest of the kernel 1002ifdef CONFIG_SAMPLES 1003vmlinux-dirs += samples 1004endif 1005 1006# The actual objects are generated when descending, 1007# make sure no implicit rule kicks in 1008$(sort $(vmlinux-deps)): $(vmlinux-dirs) ; 1009 1010# Handle descending into subdirectories listed in $(vmlinux-dirs) 1011# Preset locale variables to speed up the build process. Limit locale 1012# tweaks to this spot to avoid wrong language settings when running 1013# make menuconfig etc. 1014# Error messages still appears in the original language 1015 1016PHONY += $(vmlinux-dirs) 1017$(vmlinux-dirs): prepare scripts 1018 $(Q)$(MAKE) $(build)=$@ need-builtin=1 1019 1020define filechk_kernel.release 1021 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1022endef 1023 1024# Store (new) KERNELRELEASE string in include/config/kernel.release 1025include/config/kernel.release: include/config/auto.conf FORCE 1026 $(call filechk,kernel.release) 1027 1028 1029# Things we need to do before we recursively start building the kernel 1030# or the modules are listed in "prepare". 1031# A multi level approach is used. prepareN is processed before prepareN-1. 1032# archprepare is used in arch Makefiles and when processed asm symlink, 1033# version.h and scripts_basic is processed / created. 1034 1035# Listed in dependency order 1036PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3 1037 1038# prepare3 is used to check if we are building in a separate output directory, 1039# and if so do: 1040# 1) Check that make has not been executed in the kernel src $(srctree) 1041prepare3: include/config/kernel.release 1042ifneq ($(KBUILD_SRC),) 1043 @$(kecho) ' Using $(srctree) as source for kernel' 1044 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \ 1045 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \ 1046 echo >&2 " in the '$(srctree)' directory.";\ 1047 /bin/false; \ 1048 fi; 1049endif 1050 1051# prepare2 creates a makefile if using a separate output directory. 1052# From this point forward, .config has been reprocessed, so any rules 1053# that need to depend on updated CONFIG_* values can be checked here. 1054prepare2: prepare3 prepare-compiler-check outputmakefile asm-generic 1055 1056prepare1: prepare2 $(version_h) include/generated/utsrelease.h \ 1057 include/config/auto.conf 1058 $(cmd_crmodverdir) 1059 1060archprepare: archheaders archscripts prepare1 scripts_basic 1061 1062prepare0: archprepare gcc-plugins 1063 $(Q)$(MAKE) $(build)=. 1064 1065# All the preparing.. 1066prepare: prepare0 prepare-objtool 1067 1068# Support for using generic headers in asm-generic 1069PHONY += asm-generic uapi-asm-generic 1070asm-generic: uapi-asm-generic 1071 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \ 1072 src=asm obj=arch/$(SRCARCH)/include/generated/asm 1073uapi-asm-generic: 1074 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \ 1075 src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm 1076 1077PHONY += prepare-objtool 1078prepare-objtool: $(objtool_target) 1079 1080# Check for CONFIG flags that require compiler support. Abort the build 1081# after .config has been processed, but before the kernel build starts. 1082# 1083# For security-sensitive CONFIG options, we don't want to fallback and/or 1084# silently change which compiler flags will be used, since that leads to 1085# producing kernels with different security feature characteristics 1086# depending on the compiler used. (For example, "But I selected 1087# CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!") 1088PHONY += prepare-compiler-check 1089prepare-compiler-check: FORCE 1090# Make sure compiler supports requested stack protector flag. 1091ifdef stackp-name 1092 ifeq ($(call cc-option, $(stackp-flag)),) 1093 @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \ 1094 $(stackp-flag) not supported by compiler >&2 && exit 1 1095 endif 1096endif 1097# Make sure compiler does not have buggy stack-protector support. 1098ifdef stackp-check 1099 ifneq ($(shell $(CONFIG_SHELL) $(stackp-check) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y) 1100 @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \ 1101 $(stackp-flag) available but compiler is broken >&2 && exit 1 1102 endif 1103endif 1104 @: 1105 1106# Generate some files 1107# --------------------------------------------------------------------------- 1108 1109# KERNELRELEASE can change from a few different places, meaning version.h 1110# needs to be updated, so this check is forced on all builds 1111 1112uts_len := 64 1113define filechk_utsrelease.h 1114 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1115 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1116 exit 1; \ 1117 fi; \ 1118 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";) 1119endef 1120 1121define filechk_version.h 1122 (echo \#define LINUX_VERSION_CODE $(shell \ 1123 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \ 1124 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';) 1125endef 1126 1127$(version_h): $(srctree)/Makefile FORCE 1128 $(call filechk,version.h) 1129 $(Q)rm -f $(old_version_h) 1130 1131include/generated/utsrelease.h: include/config/kernel.release FORCE 1132 $(call filechk,utsrelease.h) 1133 1134PHONY += headerdep 1135headerdep: 1136 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1137 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1138 1139# --------------------------------------------------------------------------- 1140# Kernel headers 1141 1142#Default location for installed headers 1143export INSTALL_HDR_PATH = $(objtree)/usr 1144 1145# If we do an all arch process set dst to include/arch-$(SRCARCH) 1146hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(SRCARCH), dst=include) 1147 1148PHONY += archheaders 1149archheaders: 1150 1151PHONY += archscripts 1152archscripts: 1153 1154PHONY += __headers 1155__headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts 1156 $(Q)$(MAKE) $(build)=scripts build_unifdef 1157 1158PHONY += headers_install_all 1159headers_install_all: 1160 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install 1161 1162PHONY += headers_install 1163headers_install: __headers 1164 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \ 1165 $(error Headers not exportable for the $(SRCARCH) architecture)) 1166 $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include 1167 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) 1168 1169PHONY += headers_check_all 1170headers_check_all: headers_install_all 1171 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check 1172 1173PHONY += headers_check 1174headers_check: headers_install 1175 $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1 1176 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) HDRCHECK=1 1177 1178# --------------------------------------------------------------------------- 1179# Kernel selftest 1180 1181PHONY += kselftest 1182kselftest: 1183 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1184 1185PHONY += kselftest-clean 1186kselftest-clean: 1187 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean 1188 1189PHONY += kselftest-merge 1190kselftest-merge: 1191 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1192 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \ 1193 -m $(objtree)/.config \ 1194 $(srctree)/tools/testing/selftests/*/config 1195 +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1196 1197# --------------------------------------------------------------------------- 1198# Modules 1199 1200ifdef CONFIG_MODULES 1201 1202# By default, build modules as well 1203 1204all: modules 1205 1206# Build modules 1207# 1208# A module can be listed more than once in obj-m resulting in 1209# duplicate lines in modules.order files. Those are removed 1210# using awk while concatenating to the final file. 1211 1212PHONY += modules 1213modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin 1214 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order 1215 @$(kecho) ' Building modules, stage 2.'; 1216 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1217 1218modules.builtin: $(vmlinux-dirs:%=%/modules.builtin) 1219 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin 1220 1221%/modules.builtin: include/config/auto.conf 1222 $(Q)$(MAKE) $(modbuiltin)=$* 1223 1224 1225# Target to prepare building external modules 1226PHONY += modules_prepare 1227modules_prepare: prepare scripts 1228 1229# Target to install modules 1230PHONY += modules_install 1231modules_install: _modinst_ _modinst_post 1232 1233PHONY += _modinst_ 1234_modinst_: 1235 @rm -rf $(MODLIB)/kernel 1236 @rm -f $(MODLIB)/source 1237 @mkdir -p $(MODLIB)/kernel 1238 @ln -s $(abspath $(srctree)) $(MODLIB)/source 1239 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1240 rm -f $(MODLIB)/build ; \ 1241 ln -s $(CURDIR) $(MODLIB)/build ; \ 1242 fi 1243 @cp -f $(objtree)/modules.order $(MODLIB)/ 1244 @cp -f $(objtree)/modules.builtin $(MODLIB)/ 1245 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1246 1247# This depmod is only for convenience to give the initial 1248# boot a modules.dep even before / is mounted read-write. However the 1249# boot script depmod is the master version. 1250PHONY += _modinst_post 1251_modinst_post: _modinst_ 1252 $(call cmd,depmod) 1253 1254ifeq ($(CONFIG_MODULE_SIG), y) 1255PHONY += modules_sign 1256modules_sign: 1257 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign 1258endif 1259 1260else # CONFIG_MODULES 1261 1262# Modules not configured 1263# --------------------------------------------------------------------------- 1264 1265PHONY += modules modules_install 1266modules modules_install: 1267 @echo >&2 1268 @echo >&2 "The present kernel configuration has modules disabled." 1269 @echo >&2 "Type 'make config' and enable loadable module support." 1270 @echo >&2 "Then build a kernel with module support enabled." 1271 @echo >&2 1272 @exit 1 1273 1274endif # CONFIG_MODULES 1275 1276### 1277# Cleaning is done on three levels. 1278# make clean Delete most generated files 1279# Leave enough to build external modules 1280# make mrproper Delete the current configuration, and all generated files 1281# make distclean Remove editor backup files, patch leftover files and the like 1282 1283# Directories & files removed with 'make clean' 1284CLEAN_DIRS += $(MODVERDIR) 1285 1286# Directories & files removed with 'make mrproper' 1287MRPROPER_DIRS += include/config usr/include include/generated \ 1288 arch/*/include/generated .tmp_objdiff 1289MRPROPER_FILES += .config .config.old .version \ 1290 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \ 1291 signing_key.pem signing_key.priv signing_key.x509 \ 1292 x509.genkey extra_certificates signing_key.x509.keyid \ 1293 signing_key.x509.signer vmlinux-gdb.py 1294 1295# clean - Delete most, but leave enough to build external modules 1296# 1297clean: rm-dirs := $(CLEAN_DIRS) 1298clean: rm-files := $(CLEAN_FILES) 1299clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples) 1300 1301PHONY += $(clean-dirs) clean archclean vmlinuxclean 1302$(clean-dirs): 1303 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1304 1305vmlinuxclean: 1306 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1307 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1308 1309clean: archclean vmlinuxclean 1310 1311# mrproper - Delete all generated files, including .config 1312# 1313mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS)) 1314mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1315mrproper-dirs := $(addprefix _mrproper_,scripts) 1316 1317PHONY += $(mrproper-dirs) mrproper archmrproper 1318$(mrproper-dirs): 1319 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1320 1321mrproper: clean archmrproper $(mrproper-dirs) 1322 $(call cmd,rmdirs) 1323 $(call cmd,rmfiles) 1324 1325# distclean 1326# 1327PHONY += distclean 1328 1329distclean: mrproper 1330 @find $(srctree) $(RCS_FIND_IGNORE) \ 1331 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1332 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1333 -o -name 'core' \) \ 1334 -type f -print | xargs rm -f 1335 1336 1337# Packaging of the kernel to various formats 1338# --------------------------------------------------------------------------- 1339# rpm target kept for backward compatibility 1340package-dir := scripts/package 1341 1342%src-pkg: FORCE 1343 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1344%pkg: include/config/kernel.release FORCE 1345 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1346rpm: rpm-pkg 1347 @echo " WARNING: \"rpm\" target will be removed after Linux 4.18" 1348 @echo " Please use \"rpm-pkg\" instead." 1349 1350 1351# Brief documentation of the typical targets used 1352# --------------------------------------------------------------------------- 1353 1354boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1355boards := $(sort $(notdir $(boards))) 1356board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1357board-dirs := $(sort $(notdir $(board-dirs:/=))) 1358 1359PHONY += help 1360help: 1361 @echo 'Cleaning targets:' 1362 @echo ' clean - Remove most generated files but keep the config and' 1363 @echo ' enough build support to build external modules' 1364 @echo ' mrproper - Remove all generated files + config + various backup files' 1365 @echo ' distclean - mrproper + remove editor backup and patch files' 1366 @echo '' 1367 @echo 'Configuration targets:' 1368 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1369 @echo '' 1370 @echo 'Other generic targets:' 1371 @echo ' all - Build all targets marked with [*]' 1372 @echo '* vmlinux - Build the bare kernel' 1373 @echo '* modules - Build all modules' 1374 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1375 @echo ' dir/ - Build all files in dir and below' 1376 @echo ' dir/file.[ois] - Build specified target only' 1377 @echo ' dir/file.ll - Build the LLVM assembly file' 1378 @echo ' (requires compiler support for LLVM assembly generation)' 1379 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1380 @echo ' (requires a recent binutils and recent build (System.map))' 1381 @echo ' dir/file.ko - Build module including final link' 1382 @echo ' modules_prepare - Set up for building external modules' 1383 @echo ' tags/TAGS - Generate tags file for editors' 1384 @echo ' cscope - Generate cscope index' 1385 @echo ' gtags - Generate GNU GLOBAL index' 1386 @echo ' kernelrelease - Output the release version string (use with make -s)' 1387 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1388 @echo ' image_name - Output the image name (use with make -s)' 1389 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1390 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1391 echo '' 1392 @echo 'Static analysers:' 1393 @echo ' checkstack - Generate a list of stack hogs' 1394 @echo ' namespacecheck - Name space analysis on compiled kernel' 1395 @echo ' versioncheck - Sanity check on version.h usage' 1396 @echo ' includecheck - Check for duplicate included header files' 1397 @echo ' export_report - List the usages of all exported symbols' 1398 @echo ' headers_check - Sanity check on exported headers' 1399 @echo ' headerdep - Detect inclusion cycles in headers' 1400 @echo ' coccicheck - Check with Coccinelle' 1401 @echo '' 1402 @echo 'Kernel selftest:' 1403 @echo ' kselftest - Build and run kernel selftest (run as root)' 1404 @echo ' Build, install, and boot kernel before' 1405 @echo ' running kselftest on it' 1406 @echo ' kselftest-clean - Remove all generated kselftest files' 1407 @echo ' kselftest-merge - Merge all the config dependencies of kselftest to existing' 1408 @echo ' .config.' 1409 @echo '' 1410 @echo 'Userspace tools targets:' 1411 @echo ' use "make tools/help"' 1412 @echo ' or "cd tools; make help"' 1413 @echo '' 1414 @echo 'Kernel packaging:' 1415 @$(MAKE) $(build)=$(package-dir) help 1416 @echo '' 1417 @echo 'Documentation targets:' 1418 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1419 @echo '' 1420 @echo 'Architecture specific targets ($(SRCARCH)):' 1421 @$(if $(archhelp),$(archhelp),\ 1422 echo ' No architecture specific help defined for $(SRCARCH)') 1423 @echo '' 1424 @$(if $(boards), \ 1425 $(foreach b, $(boards), \ 1426 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1427 echo '') 1428 @$(if $(board-dirs), \ 1429 $(foreach b, $(board-dirs), \ 1430 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1431 printf " %-16s - Show all of the above\\n" help-boards; \ 1432 echo '') 1433 1434 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1435 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1436 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1437 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK (sparse by default)' 1438 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1439 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1440 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where' 1441 @echo ' 1: warnings which may be relevant and do not occur too often' 1442 @echo ' 2: warnings which occur quite often but may still be relevant' 1443 @echo ' 3: more obscure warnings, can most likely be ignored' 1444 @echo ' Multiple levels can be combined with W=12 or W=123' 1445 @echo '' 1446 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1447 @echo 'For further info see the ./README file' 1448 1449 1450help-board-dirs := $(addprefix help-,$(board-dirs)) 1451 1452help-boards: $(help-board-dirs) 1453 1454boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1455 1456$(help-board-dirs): help-%: 1457 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1458 @$(if $(boards-per-dir), \ 1459 $(foreach b, $(boards-per-dir), \ 1460 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1461 echo '') 1462 1463 1464# Documentation targets 1465# --------------------------------------------------------------------------- 1466DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1467 linkcheckdocs dochelp refcheckdocs 1468PHONY += $(DOC_TARGETS) 1469$(DOC_TARGETS): scripts_basic FORCE 1470 $(Q)$(MAKE) $(build)=Documentation $@ 1471 1472else # KBUILD_EXTMOD 1473 1474### 1475# External module support. 1476# When building external modules the kernel used as basis is considered 1477# read-only, and no consistency checks are made and the make 1478# system is not used on the basis kernel. If updates are required 1479# in the basis kernel ordinary make commands (without M=...) must 1480# be used. 1481# 1482# The following are the only valid targets when building external 1483# modules. 1484# make M=dir clean Delete all automatically generated files 1485# make M=dir modules Make all modules in specified dir 1486# make M=dir Same as 'make M=dir modules' 1487# make M=dir modules_install 1488# Install the modules built in the module directory 1489# Assumes install directory is already created 1490 1491# We are always building modules 1492KBUILD_MODULES := 1 1493PHONY += crmodverdir 1494crmodverdir: 1495 $(cmd_crmodverdir) 1496 1497PHONY += $(objtree)/Module.symvers 1498$(objtree)/Module.symvers: 1499 @test -e $(objtree)/Module.symvers || ( \ 1500 echo; \ 1501 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \ 1502 echo " is missing; modules will have no dependencies and modversions."; \ 1503 echo ) 1504 1505module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD)) 1506PHONY += $(module-dirs) modules 1507$(module-dirs): crmodverdir $(objtree)/Module.symvers 1508 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@) 1509 1510modules: $(module-dirs) 1511 @$(kecho) ' Building modules, stage 2.'; 1512 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1513 1514PHONY += modules_install 1515modules_install: _emodinst_ _emodinst_post 1516 1517install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra) 1518PHONY += _emodinst_ 1519_emodinst_: 1520 $(Q)mkdir -p $(MODLIB)/$(install-dir) 1521 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1522 1523PHONY += _emodinst_post 1524_emodinst_post: _emodinst_ 1525 $(call cmd,depmod) 1526 1527clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD)) 1528 1529PHONY += $(clean-dirs) clean 1530$(clean-dirs): 1531 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1532 1533clean: rm-dirs := $(MODVERDIR) 1534clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers 1535 1536PHONY += help 1537help: 1538 @echo ' Building external modules.' 1539 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1540 @echo '' 1541 @echo ' modules - default target, build the module(s)' 1542 @echo ' modules_install - install the module' 1543 @echo ' clean - remove generated files in module directory only' 1544 @echo '' 1545 1546# Dummies... 1547PHONY += prepare scripts 1548prepare: ; 1549scripts: ; 1550endif # KBUILD_EXTMOD 1551 1552clean: $(clean-dirs) 1553 $(call cmd,rmdirs) 1554 $(call cmd,rmfiles) 1555 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1556 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \ 1557 -o -name '*.ko.*' -o -name '*.dtb' -o -name '*.dtb.S' \ 1558 -o -name '*.dwo' -o -name '*.lst' \ 1559 -o -name '*.su' \ 1560 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1561 -o -name '*.symtypes' -o -name 'modules.order' \ 1562 -o -name modules.builtin -o -name '.tmp_*.o.*' \ 1563 -o -name .cache.mk \ 1564 -o -name '*.c.[012]*.*' \ 1565 -o -name '*.ll' \ 1566 -o -name '*.gcno' \) -type f -print | xargs rm -f 1567 1568# Generate tags for editors 1569# --------------------------------------------------------------------------- 1570quiet_cmd_tags = GEN $@ 1571 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@ 1572 1573tags TAGS cscope gtags: FORCE 1574 $(call cmd,tags) 1575 1576# Scripts to check various things for consistency 1577# --------------------------------------------------------------------------- 1578 1579PHONY += includecheck versioncheck coccicheck namespacecheck export_report 1580 1581includecheck: 1582 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1583 -name '*.[hcS]' -type f -print | sort \ 1584 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1585 1586versioncheck: 1587 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1588 -name '*.[hcS]' -type f -print | sort \ 1589 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1590 1591coccicheck: 1592 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@ 1593 1594namespacecheck: 1595 $(PERL) $(srctree)/scripts/namespace.pl 1596 1597export_report: 1598 $(PERL) $(srctree)/scripts/export_report.pl 1599 1600endif #ifeq ($(config-targets),1) 1601endif #ifeq ($(mixed-targets),1) 1602 1603PHONY += checkstack kernelrelease kernelversion image_name 1604 1605# UML needs a little special treatment here. It wants to use the host 1606# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1607# else wants $(ARCH), including people doing cross-builds, which means 1608# that $(SUBARCH) doesn't work here. 1609ifeq ($(ARCH), um) 1610CHECKSTACK_ARCH := $(SUBARCH) 1611else 1612CHECKSTACK_ARCH := $(ARCH) 1613endif 1614checkstack: 1615 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1616 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1617 1618kernelrelease: 1619 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1620 1621kernelversion: 1622 @echo $(KERNELVERSION) 1623 1624image_name: 1625 @echo $(KBUILD_IMAGE) 1626 1627# Clear a bunch of variables before executing the submake 1628tools/: FORCE 1629 $(Q)mkdir -p $(objtree)/tools 1630 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ 1631 1632tools/%: FORCE 1633 $(Q)mkdir -p $(objtree)/tools 1634 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $* 1635 1636# Single targets 1637# --------------------------------------------------------------------------- 1638# Single targets are compatible with: 1639# - build with mixed source and output 1640# - build with separate output dir 'make O=...' 1641# - external modules 1642# 1643# target-dir => where to store outputfile 1644# build-dir => directory in kernel source tree to use 1645 1646ifeq ($(KBUILD_EXTMOD),) 1647 build-dir = $(patsubst %/,%,$(dir $@)) 1648 target-dir = $(dir $@) 1649else 1650 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@))) 1651 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash)) 1652 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@)) 1653endif 1654 1655%.s: %.c prepare scripts FORCE 1656 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1657%.i: %.c prepare scripts FORCE 1658 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1659%.o: %.c prepare scripts FORCE 1660 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1661%.lst: %.c prepare scripts FORCE 1662 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1663%.s: %.S prepare scripts FORCE 1664 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1665%.o: %.S prepare scripts FORCE 1666 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1667%.symtypes: %.c prepare scripts FORCE 1668 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1669%.ll: %.c prepare scripts FORCE 1670 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1671 1672# Modules 1673/: prepare scripts FORCE 1674 $(cmd_crmodverdir) 1675 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1676 $(build)=$(build-dir) 1677# Make sure the latest headers are built for Documentation 1678Documentation/ samples/: headers_install 1679%/: prepare scripts FORCE 1680 $(cmd_crmodverdir) 1681 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1682 $(build)=$(build-dir) 1683%.ko: prepare scripts FORCE 1684 $(cmd_crmodverdir) 1685 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1686 $(build)=$(build-dir) $(@:.ko=.o) 1687 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1688 1689# FIXME Should go into a make.lib or something 1690# =========================================================================== 1691 1692quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs))) 1693 cmd_rmdirs = rm -rf $(rm-dirs) 1694 1695quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1696 cmd_rmfiles = rm -f $(rm-files) 1697 1698# Run depmod only if we have System.map and depmod is executable 1699quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) 1700 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1701 $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))" 1702 1703# Create temporary dir for module support files 1704# clean it up only when building all modules 1705cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \ 1706 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*) 1707 1708# read all saved command lines 1709 1710cmd_files := $(wildcard .*.cmd $(foreach f,$(sort $(targets)),$(dir $(f)).$(notdir $(f)).cmd)) 1711 1712ifneq ($(cmd_files),) 1713 $(cmd_files): ; # Do not try to update included dependency files 1714 include $(cmd_files) 1715endif 1716 1717endif # skip-makefile 1718 1719PHONY += FORCE 1720FORCE: 1721 1722# Declare the contents of the .PHONY variable as phony. We keep that 1723# information in a variable so we can use it in if_changed and friends. 1724.PHONY: $(PHONY) 1725