1# SPDX-License-Identifier: GPL-2.0 2VERSION = 4 3PATCHLEVEL = 16 4SUBLEVEL = 0 5EXTRAVERSION = -rc1 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 380LEX = flex 381YACC = bison 382AWK = awk 383GENKSYMS = scripts/genksyms/genksyms 384INSTALLKERNEL := installkernel 385DEPMOD = /sbin/depmod 386PERL = perl 387PYTHON = python 388CHECK = sparse 389 390CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 391 -Wbitwise -Wno-return-void $(CF) 392NOSTDINC_FLAGS = 393CFLAGS_MODULE = 394AFLAGS_MODULE = 395LDFLAGS_MODULE = 396CFLAGS_KERNEL = 397AFLAGS_KERNEL = 398LDFLAGS_vmlinux = 399 400# Use USERINCLUDE when you must reference the UAPI directories only. 401USERINCLUDE := \ 402 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 403 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 404 -I$(srctree)/include/uapi \ 405 -I$(objtree)/include/generated/uapi \ 406 -include $(srctree)/include/linux/kconfig.h 407 408# Use LINUXINCLUDE when you must reference the include/ directory. 409# Needed to be compatible with the O= option 410LINUXINCLUDE := \ 411 -I$(srctree)/arch/$(SRCARCH)/include \ 412 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 413 $(if $(KBUILD_SRC), -I$(srctree)/include) \ 414 -I$(objtree)/include \ 415 $(USERINCLUDE) 416 417KBUILD_AFLAGS := -D__ASSEMBLY__ 418KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \ 419 -fno-strict-aliasing -fno-common -fshort-wchar \ 420 -Werror-implicit-function-declaration \ 421 -Wno-format-security \ 422 -std=gnu89 423KBUILD_CPPFLAGS := -D__KERNEL__ 424KBUILD_AFLAGS_KERNEL := 425KBUILD_CFLAGS_KERNEL := 426KBUILD_AFLAGS_MODULE := -DMODULE 427KBUILD_CFLAGS_MODULE := -DMODULE 428KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds 429GCC_PLUGINS_CFLAGS := 430 431export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC 432export CPP AR NM STRIP OBJCOPY OBJDUMP HOSTLDFLAGS HOST_LOADLIBES 433export MAKE LEX YACC AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE 434export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS 435 436export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS 437export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 438export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN 439export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 440export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 441export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 442export KBUILD_ARFLAGS 443 444# When compiling out-of-tree modules, put MODVERDIR in the module 445# tree rather than in the kernel tree. The kernel tree might 446# even be read-only. 447export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions 448 449# Files to ignore in find ... statements 450 451export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 452 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 453 -prune -o 454export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 455 --exclude CVS --exclude .pc --exclude .hg --exclude .git 456 457# =========================================================================== 458# Rules shared between *config targets and build targets 459 460# Basic helpers built in scripts/basic/ 461PHONY += scripts_basic 462scripts_basic: 463 $(Q)$(MAKE) $(build)=scripts/basic 464 $(Q)rm -f .tmp_quiet_recordmcount 465 466# To avoid any implicit rule to kick in, define an empty command. 467scripts/basic/%: scripts_basic ; 468 469PHONY += outputmakefile 470# outputmakefile generates a Makefile in the output directory, if using a 471# separate output directory. This allows convenient use of make in the 472# output directory. 473outputmakefile: 474ifneq ($(KBUILD_SRC),) 475 $(Q)ln -fsn $(srctree) source 476 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \ 477 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL) 478endif 479 480ifeq ($(cc-name),clang) 481ifneq ($(CROSS_COMPILE),) 482CLANG_TARGET := --target=$(notdir $(CROSS_COMPILE:%-=%)) 483GCC_TOOLCHAIN := $(realpath $(dir $(shell which $(LD)))/..) 484endif 485ifneq ($(GCC_TOOLCHAIN),) 486CLANG_GCC_TC := --gcc-toolchain=$(GCC_TOOLCHAIN) 487endif 488KBUILD_CFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC) 489KBUILD_AFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC) 490endif 491 492ifeq ($(config-targets),1) 493# =========================================================================== 494# *config targets only - make sure prerequisites are updated, and descend 495# in scripts/kconfig to make the *config target 496 497# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 498# KBUILD_DEFCONFIG may point out an alternative default configuration 499# used for 'make defconfig' 500include arch/$(SRCARCH)/Makefile 501export KBUILD_DEFCONFIG KBUILD_KCONFIG 502 503config: scripts_basic outputmakefile FORCE 504 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 505 506%config: scripts_basic outputmakefile FORCE 507 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 508 509else 510# =========================================================================== 511# Build targets only - this includes vmlinux, arch specific targets, clean 512# targets and others. In general all targets except *config targets. 513 514# If building an external module we do not care about the all: rule 515# but instead _all depend on modules 516PHONY += all 517ifeq ($(KBUILD_EXTMOD),) 518_all: all 519else 520_all: modules 521endif 522 523# Decide whether to build built-in, modular, or both. 524# Normally, just do built-in. 525 526KBUILD_MODULES := 527KBUILD_BUILTIN := 1 528 529# If we have only "make modules", don't compile built-in objects. 530# When we're building modules with modversions, we need to consider 531# the built-in objects during the descend as well, in order to 532# make sure the checksums are up to date before we record them. 533 534ifeq ($(MAKECMDGOALS),modules) 535 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1) 536endif 537 538# If we have "make <whatever> modules", compile modules 539# in addition to whatever we do anyway. 540# Just "make" or "make all" shall build modules as well 541 542ifneq ($(filter all _all modules,$(MAKECMDGOALS)),) 543 KBUILD_MODULES := 1 544endif 545 546ifeq ($(MAKECMDGOALS),) 547 KBUILD_MODULES := 1 548endif 549 550export KBUILD_MODULES KBUILD_BUILTIN 551 552ifeq ($(KBUILD_EXTMOD),) 553# Additional helpers built in scripts/ 554# Carefully list dependencies so we do not try to build scripts twice 555# in parallel 556PHONY += scripts 557scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \ 558 asm-generic gcc-plugins 559 $(Q)$(MAKE) $(build)=$(@) 560 561# Objects we will link into vmlinux / subdirs we need to visit 562init-y := init/ 563drivers-y := drivers/ sound/ firmware/ 564net-y := net/ 565libs-y := lib/ 566core-y := usr/ 567virt-y := virt/ 568endif # KBUILD_EXTMOD 569 570ifeq ($(dot-config),1) 571# Read in config 572-include include/config/auto.conf 573 574ifeq ($(KBUILD_EXTMOD),) 575# Read in dependencies to all Kconfig* files, make sure to run 576# oldconfig if changes are detected. 577-include include/config/auto.conf.cmd 578 579# To avoid any implicit rule to kick in, define an empty command 580$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ; 581 582# If .config is newer than include/config/auto.conf, someone tinkered 583# with it and forgot to run make oldconfig. 584# if auto.conf.cmd is missing then we are probably in a cleaned tree so 585# we execute the config step to be sure to catch updated Kconfig files 586include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd 587 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig 588else 589# external modules needs include/generated/autoconf.h and include/config/auto.conf 590# but do not care if they are up-to-date. Use auto.conf to trigger the test 591PHONY += include/config/auto.conf 592 593include/config/auto.conf: 594 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 595 echo >&2; \ 596 echo >&2 " ERROR: Kernel configuration is invalid."; \ 597 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 598 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 599 echo >&2 ; \ 600 /bin/false) 601 602endif # KBUILD_EXTMOD 603 604else 605# Dummy target needed, because used as prerequisite 606include/config/auto.conf: ; 607endif # $(dot-config) 608 609# For the kernel to actually contain only the needed exported symbols, 610# we have to build modules as well to determine what those symbols are. 611# (this can be evaluated only once include/config/auto.conf has been included) 612ifdef CONFIG_TRIM_UNUSED_KSYMS 613 KBUILD_MODULES := 1 614endif 615 616# The all: target is the default when no target is given on the 617# command line. 618# This allow a user to issue only 'make' to build a kernel including modules 619# Defaults to vmlinux, but the arch makefile usually adds further targets 620all: vmlinux 621 622KBUILD_CFLAGS += $(call cc-option,-fno-PIE) 623KBUILD_AFLAGS += $(call cc-option,-fno-PIE) 624CFLAGS_GCOV := -fprofile-arcs -ftest-coverage -fno-tree-loop-im $(call cc-disable-warning,maybe-uninitialized,) 625export CFLAGS_GCOV CFLAGS_KCOV 626 627# The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default 628# values of the respective KBUILD_* variables 629ARCH_CPPFLAGS := 630ARCH_AFLAGS := 631ARCH_CFLAGS := 632include arch/$(SRCARCH)/Makefile 633 634KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,) 635KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) 636KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) 637KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) 638KBUILD_CFLAGS += $(call cc-disable-warning, int-in-bool-context) 639 640ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 641KBUILD_CFLAGS += $(call cc-option,-Oz,-Os) 642KBUILD_CFLAGS += $(call cc-disable-warning,maybe-uninitialized,) 643else 644ifdef CONFIG_PROFILE_ALL_BRANCHES 645KBUILD_CFLAGS += -O2 $(call cc-disable-warning,maybe-uninitialized,) 646else 647KBUILD_CFLAGS += -O2 648endif 649endif 650 651KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \ 652 $(call cc-disable-warning,maybe-uninitialized,)) 653 654# Tell gcc to never replace conditional load with a non-conditional one 655KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 656 657# check for 'asm goto' 658ifeq ($(call shell-cached,$(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y) 659 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO 660 KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO 661endif 662 663include scripts/Makefile.kcov 664include scripts/Makefile.gcc-plugins 665 666ifdef CONFIG_READABLE_ASM 667# Disable optimizations that make assembler listings hard to read. 668# reorder blocks reorders the control in the function 669# ipa clone creates specialized cloned functions 670# partial inlining inlines only parts of functions 671KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \ 672 $(call cc-option,-fno-ipa-cp-clone,) \ 673 $(call cc-option,-fno-partial-inlining) 674endif 675 676ifneq ($(CONFIG_FRAME_WARN),0) 677KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN}) 678endif 679 680# This selects the stack protector compiler flag. Testing it is delayed 681# until after .config has been reprocessed, in the prepare-compiler-check 682# target. 683ifdef CONFIG_CC_STACKPROTECTOR_AUTO 684 stackp-flag := $(call cc-option,-fstack-protector-strong,$(call cc-option,-fstack-protector)) 685 stackp-name := AUTO 686else 687ifdef CONFIG_CC_STACKPROTECTOR_REGULAR 688 stackp-flag := -fstack-protector 689 stackp-name := REGULAR 690else 691ifdef CONFIG_CC_STACKPROTECTOR_STRONG 692 stackp-flag := -fstack-protector-strong 693 stackp-name := STRONG 694else 695 # If either there is no stack protector for this architecture or 696 # CONFIG_CC_STACKPROTECTOR_NONE is selected, we're done, and $(stackp-name) 697 # is empty, skipping all remaining stack protector tests. 698 # 699 # Force off for distro compilers that enable stack protector by default. 700 KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector) 701endif 702endif 703endif 704# Find arch-specific stack protector compiler sanity-checking script. 705ifdef stackp-name 706ifneq ($(stackp-flag),) 707 stackp-path := $(srctree)/scripts/gcc-$(SRCARCH)_$(BITS)-has-stack-protector.sh 708 stackp-check := $(wildcard $(stackp-path)) 709 # If the wildcard test matches a test script, run it to check functionality. 710 ifdef stackp-check 711 ifneq ($(shell $(CONFIG_SHELL) $(stackp-check) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y) 712 stackp-broken := y 713 endif 714 endif 715 ifndef stackp-broken 716 # If the stack protector is functional, enable code that depends on it. 717 KBUILD_CPPFLAGS += -DCONFIG_CC_STACKPROTECTOR 718 # Either we've already detected the flag (for AUTO) or we'll fail the 719 # build in the prepare-compiler-check rule (for specific flag). 720 KBUILD_CFLAGS += $(stackp-flag) 721 else 722 # We have to make sure stack protector is unconditionally disabled if 723 # the compiler is broken (in case we're going to continue the build in 724 # AUTO mode). 725 KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector) 726 endif 727endif 728endif 729 730ifeq ($(cc-name),clang) 731KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,) 732KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier) 733KBUILD_CFLAGS += $(call cc-disable-warning, gnu) 734KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) 735# Quiet clang warning: comparison of unsigned expression < 0 is always false 736KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare) 737# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the 738# source of a reference will be _MergedGlobals and not on of the whitelisted names. 739# See modpost pattern 2 740KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,) 741KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior) 742KBUILD_CFLAGS += $(call cc-option, -no-integrated-as) 743KBUILD_AFLAGS += $(call cc-option, -no-integrated-as) 744else 745 746# These warnings generated too much noise in a regular build. 747# Use make W=1 to enable them (see scripts/Makefile.extrawarn) 748KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable) 749endif 750 751KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) 752ifdef CONFIG_FRAME_POINTER 753KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 754else 755# Some targets (ARM with Thumb2, for example), can't be built with frame 756# pointers. For those, we don't have FUNCTION_TRACER automatically 757# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 758# incompatible with -fomit-frame-pointer with current GCC, so we don't use 759# -fomit-frame-pointer with FUNCTION_TRACER. 760ifndef CONFIG_FUNCTION_TRACER 761KBUILD_CFLAGS += -fomit-frame-pointer 762endif 763endif 764 765KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments) 766 767ifdef CONFIG_DEBUG_INFO 768ifdef CONFIG_DEBUG_INFO_SPLIT 769KBUILD_CFLAGS += $(call cc-option, -gsplit-dwarf, -g) 770else 771KBUILD_CFLAGS += -g 772endif 773KBUILD_AFLAGS += -Wa,-gdwarf-2 774endif 775ifdef CONFIG_DEBUG_INFO_DWARF4 776KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,) 777endif 778 779ifdef CONFIG_DEBUG_INFO_REDUCED 780KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \ 781 $(call cc-option,-fno-var-tracking) 782endif 783 784ifdef CONFIG_FUNCTION_TRACER 785ifndef CC_FLAGS_FTRACE 786CC_FLAGS_FTRACE := -pg 787endif 788export CC_FLAGS_FTRACE 789ifdef CONFIG_HAVE_FENTRY 790CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY) 791endif 792KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY) 793KBUILD_AFLAGS += $(CC_USING_FENTRY) 794ifdef CONFIG_DYNAMIC_FTRACE 795 ifdef CONFIG_HAVE_C_RECORDMCOUNT 796 BUILD_C_RECORDMCOUNT := y 797 export BUILD_C_RECORDMCOUNT 798 endif 799endif 800endif 801 802# We trigger additional mismatches with less inlining 803ifdef CONFIG_DEBUG_SECTION_MISMATCH 804KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) 805endif 806 807ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 808KBUILD_CFLAGS += $(call cc-option,-ffunction-sections,) 809KBUILD_CFLAGS += $(call cc-option,-fdata-sections,) 810endif 811 812# arch Makefile may override CC so keep this after arch Makefile is included 813NOSTDINC_FLAGS += -nostdinc -isystem $(call shell-cached,$(CC) -print-file-name=include) 814CHECKFLAGS += $(NOSTDINC_FLAGS) 815 816# warn about C99 declaration after statement 817KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,) 818 819# disable pointer signed / unsigned warnings in gcc 4.0 820KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign) 821 822# disable invalid "can't wrap" optimizations for signed / pointers 823KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow) 824 825# Make sure -fstack-check isn't enabled (like gentoo apparently did) 826KBUILD_CFLAGS += $(call cc-option,-fno-stack-check,) 827 828# conserve stack if available 829KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) 830 831# disallow errors like 'EXPORT_GPL(foo);' with missing header 832KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int) 833 834# require functions to have arguments in prototypes, not empty 'int foo()' 835KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes) 836 837# Prohibit date/time macros, which would make the build non-deterministic 838KBUILD_CFLAGS += $(call cc-option,-Werror=date-time) 839 840# enforce correct pointer usage 841KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 842 843# Require designated initializers for all marked structures 844KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) 845 846# use the deterministic mode of AR if available 847KBUILD_ARFLAGS := $(call ar-option,D) 848 849include scripts/Makefile.kasan 850include scripts/Makefile.extrawarn 851include scripts/Makefile.ubsan 852 853# Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the 854# last assignments 855KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS) 856KBUILD_AFLAGS += $(ARCH_AFLAGS) $(KAFLAGS) 857KBUILD_CFLAGS += $(ARCH_CFLAGS) $(KCFLAGS) 858 859# Use --build-id when available. 860LDFLAGS_BUILD_ID := $(patsubst -Wl$(comma)%,%,\ 861 $(call cc-ldoption, -Wl$(comma)--build-id,)) 862KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID) 863LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID) 864 865ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 866LDFLAGS_vmlinux += $(call ld-option, --gc-sections,) 867endif 868 869ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 870LDFLAGS_vmlinux += $(call ld-option, -X,) 871endif 872 873# Default kernel image to build when no specific target is given. 874# KBUILD_IMAGE may be overruled on the command line or 875# set in the environment 876# Also any assignments in arch/$(ARCH)/Makefile take precedence over 877# this default value 878export KBUILD_IMAGE ?= vmlinux 879 880# 881# INSTALL_PATH specifies where to place the updated kernel and system map 882# images. Default is /boot, but you can set it to other values 883export INSTALL_PATH ?= /boot 884 885# 886# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 887# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 888# an argument if needed. Otherwise it defaults to the kernel install path 889# 890export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 891 892# 893# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 894# relocations required by build roots. This is not defined in the 895# makefile but the argument can be passed to make if needed. 896# 897 898MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 899export MODLIB 900 901# 902# INSTALL_MOD_STRIP, if defined, will cause modules to be 903# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then 904# the default option --strip-debug will be used. Otherwise, 905# INSTALL_MOD_STRIP value will be used as the options to the strip command. 906 907ifdef INSTALL_MOD_STRIP 908ifeq ($(INSTALL_MOD_STRIP),1) 909mod_strip_cmd = $(STRIP) --strip-debug 910else 911mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP) 912endif # INSTALL_MOD_STRIP=1 913else 914mod_strip_cmd = true 915endif # INSTALL_MOD_STRIP 916export mod_strip_cmd 917 918# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed 919# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP 920# or CONFIG_MODULE_COMPRESS_XZ. 921 922mod_compress_cmd = true 923ifdef CONFIG_MODULE_COMPRESS 924 ifdef CONFIG_MODULE_COMPRESS_GZIP 925 mod_compress_cmd = gzip -n -f 926 endif # CONFIG_MODULE_COMPRESS_GZIP 927 ifdef CONFIG_MODULE_COMPRESS_XZ 928 mod_compress_cmd = xz -f 929 endif # CONFIG_MODULE_COMPRESS_XZ 930endif # CONFIG_MODULE_COMPRESS 931export mod_compress_cmd 932 933# Select initial ramdisk compression format, default is gzip(1). 934# This shall be used by the dracut(8) tool while creating an initramfs image. 935# 936INITRD_COMPRESS-y := gzip 937INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2 938INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma 939INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz 940INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo 941INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4 942# do not export INITRD_COMPRESS, since we didn't actually 943# choose a sane default compression above. 944# export INITRD_COMPRESS := $(INITRD_COMPRESS-y) 945 946ifdef CONFIG_MODULE_SIG_ALL 947$(eval $(call config_filename,MODULE_SIG_KEY)) 948 949mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509 950else 951mod_sign_cmd = true 952endif 953export mod_sign_cmd 954 955ifdef CONFIG_STACK_VALIDATION 956 has_libelf := $(call try-run,\ 957 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0) 958 ifeq ($(has_libelf),1) 959 objtool_target := tools/objtool FORCE 960 else 961 ifdef CONFIG_UNWINDER_ORC 962 $(error "Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel") 963 else 964 $(warning "Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel") 965 endif 966 SKIP_STACK_VALIDATION := 1 967 export SKIP_STACK_VALIDATION 968 endif 969endif 970 971 972ifeq ($(KBUILD_EXTMOD),) 973core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/ 974 975vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \ 976 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 977 $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y))) 978 979vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \ 980 $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-)))) 981 982init-y := $(patsubst %/, %/built-in.o, $(init-y)) 983core-y := $(patsubst %/, %/built-in.o, $(core-y)) 984drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y)) 985net-y := $(patsubst %/, %/built-in.o, $(net-y)) 986libs-y1 := $(patsubst %/, %/lib.a, $(libs-y)) 987libs-y2 := $(filter-out %.a, $(patsubst %/, %/built-in.o, $(libs-y))) 988virt-y := $(patsubst %/, %/built-in.o, $(virt-y)) 989 990# Externally visible symbols (used by link-vmlinux.sh) 991export KBUILD_VMLINUX_INIT := $(head-y) $(init-y) 992export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y2) $(drivers-y) $(net-y) $(virt-y) 993export KBUILD_VMLINUX_LIBS := $(libs-y1) 994export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 995export LDFLAGS_vmlinux 996# used by scripts/package/Makefile 997export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools) 998 999vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) $(KBUILD_VMLINUX_LIBS) 1000 1001# Include targets which we want to execute sequentially if the rest of the 1002# kernel build went well. If CONFIG_TRIM_UNUSED_KSYMS is set, this might be 1003# evaluated more than once. 1004PHONY += vmlinux_prereq 1005vmlinux_prereq: $(vmlinux-deps) FORCE 1006ifdef CONFIG_HEADERS_CHECK 1007 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check 1008endif 1009ifdef CONFIG_GDB_SCRIPTS 1010 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1011endif 1012ifdef CONFIG_TRIM_UNUSED_KSYMS 1013 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ 1014 "$(MAKE) -f $(srctree)/Makefile vmlinux" 1015endif 1016 1017# standalone target for easier testing 1018include/generated/autoksyms.h: FORCE 1019 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh true 1020 1021ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink) 1022 1023# Final link of vmlinux with optional arch pass after final link 1024cmd_link-vmlinux = \ 1025 $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) ; \ 1026 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) 1027 1028vmlinux: scripts/link-vmlinux.sh vmlinux_prereq $(vmlinux-deps) FORCE 1029 +$(call if_changed,link-vmlinux) 1030 1031# Build samples along the rest of the kernel 1032ifdef CONFIG_SAMPLES 1033vmlinux-dirs += samples 1034endif 1035 1036# The actual objects are generated when descending, 1037# make sure no implicit rule kicks in 1038$(sort $(vmlinux-deps)): $(vmlinux-dirs) ; 1039 1040# Handle descending into subdirectories listed in $(vmlinux-dirs) 1041# Preset locale variables to speed up the build process. Limit locale 1042# tweaks to this spot to avoid wrong language settings when running 1043# make menuconfig etc. 1044# Error messages still appears in the original language 1045 1046PHONY += $(vmlinux-dirs) 1047$(vmlinux-dirs): prepare scripts 1048 $(Q)$(MAKE) $(build)=$@ need-builtin=1 1049 1050define filechk_kernel.release 1051 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1052endef 1053 1054# Store (new) KERNELRELEASE string in include/config/kernel.release 1055include/config/kernel.release: include/config/auto.conf FORCE 1056 $(call filechk,kernel.release) 1057 1058 1059# Things we need to do before we recursively start building the kernel 1060# or the modules are listed in "prepare". 1061# A multi level approach is used. prepareN is processed before prepareN-1. 1062# archprepare is used in arch Makefiles and when processed asm symlink, 1063# version.h and scripts_basic is processed / created. 1064 1065# Listed in dependency order 1066PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3 1067 1068# prepare3 is used to check if we are building in a separate output directory, 1069# and if so do: 1070# 1) Check that make has not been executed in the kernel src $(srctree) 1071prepare3: include/config/kernel.release 1072ifneq ($(KBUILD_SRC),) 1073 @$(kecho) ' Using $(srctree) as source for kernel' 1074 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \ 1075 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \ 1076 echo >&2 " in the '$(srctree)' directory.";\ 1077 /bin/false; \ 1078 fi; 1079endif 1080 1081# prepare2 creates a makefile if using a separate output directory. 1082# From this point forward, .config has been reprocessed, so any rules 1083# that need to depend on updated CONFIG_* values can be checked here. 1084prepare2: prepare3 prepare-compiler-check outputmakefile asm-generic 1085 1086prepare1: prepare2 $(version_h) include/generated/utsrelease.h \ 1087 include/config/auto.conf 1088 $(cmd_crmodverdir) 1089 1090archprepare: archheaders archscripts prepare1 scripts_basic 1091 1092prepare0: archprepare gcc-plugins 1093 $(Q)$(MAKE) $(build)=. 1094 1095# All the preparing.. 1096prepare: prepare0 prepare-objtool 1097 1098# Support for using generic headers in asm-generic 1099PHONY += asm-generic uapi-asm-generic 1100asm-generic: uapi-asm-generic 1101 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \ 1102 src=asm obj=arch/$(SRCARCH)/include/generated/asm 1103uapi-asm-generic: 1104 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \ 1105 src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm 1106 1107PHONY += prepare-objtool 1108prepare-objtool: $(objtool_target) 1109 1110# Check for CONFIG flags that require compiler support. Abort the build 1111# after .config has been processed, but before the kernel build starts. 1112# 1113# For security-sensitive CONFIG options, we don't want to fallback and/or 1114# silently change which compiler flags will be used, since that leads to 1115# producing kernels with different security feature characteristics 1116# depending on the compiler used. (For example, "But I selected 1117# CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!") 1118PHONY += prepare-compiler-check 1119prepare-compiler-check: FORCE 1120# Make sure compiler supports requested stack protector flag. 1121ifdef stackp-name 1122 # Warn about CONFIG_CC_STACKPROTECTOR_AUTO having found no option. 1123 ifeq ($(stackp-flag),) 1124 @echo CONFIG_CC_STACKPROTECTOR_$(stackp-name): \ 1125 Compiler does not support any known stack-protector >&2 1126 else 1127 # Fail if specifically requested stack protector is missing. 1128 ifeq ($(call cc-option, $(stackp-flag)),) 1129 @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \ 1130 $(stackp-flag) not supported by compiler >&2 && exit 1 1131 endif 1132 endif 1133endif 1134# Make sure compiler does not have buggy stack-protector support. If a 1135# specific stack-protector was requested, fail the build, otherwise warn. 1136ifdef stackp-broken 1137 ifeq ($(stackp-name),AUTO) 1138 @echo CONFIG_CC_STACKPROTECTOR_$(stackp-name): \ 1139 $(stackp-flag) available but compiler is broken: disabling >&2 1140 else 1141 @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \ 1142 $(stackp-flag) available but compiler is broken >&2 && exit 1 1143 endif 1144endif 1145 @: 1146 1147# Generate some files 1148# --------------------------------------------------------------------------- 1149 1150# KERNELRELEASE can change from a few different places, meaning version.h 1151# needs to be updated, so this check is forced on all builds 1152 1153uts_len := 64 1154define filechk_utsrelease.h 1155 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1156 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1157 exit 1; \ 1158 fi; \ 1159 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";) 1160endef 1161 1162define filechk_version.h 1163 (echo \#define LINUX_VERSION_CODE $(shell \ 1164 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \ 1165 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';) 1166endef 1167 1168$(version_h): $(srctree)/Makefile FORCE 1169 $(call filechk,version.h) 1170 $(Q)rm -f $(old_version_h) 1171 1172include/generated/utsrelease.h: include/config/kernel.release FORCE 1173 $(call filechk,utsrelease.h) 1174 1175PHONY += headerdep 1176headerdep: 1177 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1178 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1179 1180# --------------------------------------------------------------------------- 1181# Kernel headers 1182 1183#Default location for installed headers 1184export INSTALL_HDR_PATH = $(objtree)/usr 1185 1186# If we do an all arch process set dst to include/arch-$(SRCARCH) 1187hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(SRCARCH), dst=include) 1188 1189PHONY += archheaders 1190archheaders: 1191 1192PHONY += archscripts 1193archscripts: 1194 1195PHONY += __headers 1196__headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts 1197 $(Q)$(MAKE) $(build)=scripts build_unifdef 1198 1199PHONY += headers_install_all 1200headers_install_all: 1201 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install 1202 1203PHONY += headers_install 1204headers_install: __headers 1205 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \ 1206 $(error Headers not exportable for the $(SRCARCH) architecture)) 1207 $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include 1208 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) 1209 1210PHONY += headers_check_all 1211headers_check_all: headers_install_all 1212 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check 1213 1214PHONY += headers_check 1215headers_check: headers_install 1216 $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1 1217 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) HDRCHECK=1 1218 1219# --------------------------------------------------------------------------- 1220# Kernel selftest 1221 1222PHONY += kselftest 1223kselftest: 1224 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1225 1226PHONY += kselftest-clean 1227kselftest-clean: 1228 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean 1229 1230PHONY += kselftest-merge 1231kselftest-merge: 1232 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1233 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \ 1234 -m $(objtree)/.config \ 1235 $(srctree)/tools/testing/selftests/*/config 1236 +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1237 1238# --------------------------------------------------------------------------- 1239# Modules 1240 1241ifdef CONFIG_MODULES 1242 1243# By default, build modules as well 1244 1245all: modules 1246 1247# Build modules 1248# 1249# A module can be listed more than once in obj-m resulting in 1250# duplicate lines in modules.order files. Those are removed 1251# using awk while concatenating to the final file. 1252 1253PHONY += modules 1254modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin 1255 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order 1256 @$(kecho) ' Building modules, stage 2.'; 1257 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1258 1259modules.builtin: $(vmlinux-dirs:%=%/modules.builtin) 1260 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin 1261 1262%/modules.builtin: include/config/auto.conf 1263 $(Q)$(MAKE) $(modbuiltin)=$* 1264 1265 1266# Target to prepare building external modules 1267PHONY += modules_prepare 1268modules_prepare: prepare scripts 1269 1270# Target to install modules 1271PHONY += modules_install 1272modules_install: _modinst_ _modinst_post 1273 1274PHONY += _modinst_ 1275_modinst_: 1276 @rm -rf $(MODLIB)/kernel 1277 @rm -f $(MODLIB)/source 1278 @mkdir -p $(MODLIB)/kernel 1279 @ln -s $(abspath $(srctree)) $(MODLIB)/source 1280 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1281 rm -f $(MODLIB)/build ; \ 1282 ln -s $(CURDIR) $(MODLIB)/build ; \ 1283 fi 1284 @cp -f $(objtree)/modules.order $(MODLIB)/ 1285 @cp -f $(objtree)/modules.builtin $(MODLIB)/ 1286 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1287 1288# This depmod is only for convenience to give the initial 1289# boot a modules.dep even before / is mounted read-write. However the 1290# boot script depmod is the master version. 1291PHONY += _modinst_post 1292_modinst_post: _modinst_ 1293 $(call cmd,depmod) 1294 1295ifeq ($(CONFIG_MODULE_SIG), y) 1296PHONY += modules_sign 1297modules_sign: 1298 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign 1299endif 1300 1301else # CONFIG_MODULES 1302 1303# Modules not configured 1304# --------------------------------------------------------------------------- 1305 1306PHONY += modules modules_install 1307modules modules_install: 1308 @echo >&2 1309 @echo >&2 "The present kernel configuration has modules disabled." 1310 @echo >&2 "Type 'make config' and enable loadable module support." 1311 @echo >&2 "Then build a kernel with module support enabled." 1312 @echo >&2 1313 @exit 1 1314 1315endif # CONFIG_MODULES 1316 1317### 1318# Cleaning is done on three levels. 1319# make clean Delete most generated files 1320# Leave enough to build external modules 1321# make mrproper Delete the current configuration, and all generated files 1322# make distclean Remove editor backup files, patch leftover files and the like 1323 1324# Directories & files removed with 'make clean' 1325CLEAN_DIRS += $(MODVERDIR) 1326 1327# Directories & files removed with 'make mrproper' 1328MRPROPER_DIRS += include/config usr/include include/generated \ 1329 arch/*/include/generated .tmp_objdiff 1330MRPROPER_FILES += .config .config.old .version \ 1331 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \ 1332 signing_key.pem signing_key.priv signing_key.x509 \ 1333 x509.genkey extra_certificates signing_key.x509.keyid \ 1334 signing_key.x509.signer vmlinux-gdb.py 1335 1336# clean - Delete most, but leave enough to build external modules 1337# 1338clean: rm-dirs := $(CLEAN_DIRS) 1339clean: rm-files := $(CLEAN_FILES) 1340clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples) 1341 1342PHONY += $(clean-dirs) clean archclean vmlinuxclean 1343$(clean-dirs): 1344 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1345 1346vmlinuxclean: 1347 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1348 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1349 1350clean: archclean vmlinuxclean 1351 1352# mrproper - Delete all generated files, including .config 1353# 1354mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS)) 1355mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1356mrproper-dirs := $(addprefix _mrproper_,scripts) 1357 1358PHONY += $(mrproper-dirs) mrproper archmrproper 1359$(mrproper-dirs): 1360 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1361 1362mrproper: clean archmrproper $(mrproper-dirs) 1363 $(call cmd,rmdirs) 1364 $(call cmd,rmfiles) 1365 1366# distclean 1367# 1368PHONY += distclean 1369 1370distclean: mrproper 1371 @find $(srctree) $(RCS_FIND_IGNORE) \ 1372 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1373 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1374 -o -name 'core' \) \ 1375 -type f -print | xargs rm -f 1376 1377 1378# Packaging of the kernel to various formats 1379# --------------------------------------------------------------------------- 1380# rpm target kept for backward compatibility 1381package-dir := scripts/package 1382 1383%src-pkg: FORCE 1384 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1385%pkg: include/config/kernel.release FORCE 1386 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1387rpm: rpm-pkg 1388 @echo " WARNING: \"rpm\" target will be removed after Linux 4.18" 1389 @echo " Please use \"rpm-pkg\" instead." 1390 1391 1392# Brief documentation of the typical targets used 1393# --------------------------------------------------------------------------- 1394 1395boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1396boards := $(sort $(notdir $(boards))) 1397board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1398board-dirs := $(sort $(notdir $(board-dirs:/=))) 1399 1400PHONY += help 1401help: 1402 @echo 'Cleaning targets:' 1403 @echo ' clean - Remove most generated files but keep the config and' 1404 @echo ' enough build support to build external modules' 1405 @echo ' mrproper - Remove all generated files + config + various backup files' 1406 @echo ' distclean - mrproper + remove editor backup and patch files' 1407 @echo '' 1408 @echo 'Configuration targets:' 1409 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1410 @echo '' 1411 @echo 'Other generic targets:' 1412 @echo ' all - Build all targets marked with [*]' 1413 @echo '* vmlinux - Build the bare kernel' 1414 @echo '* modules - Build all modules' 1415 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1416 @echo ' dir/ - Build all files in dir and below' 1417 @echo ' dir/file.[ois] - Build specified target only' 1418 @echo ' dir/file.ll - Build the LLVM assembly file' 1419 @echo ' (requires compiler support for LLVM assembly generation)' 1420 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1421 @echo ' (requires a recent binutils and recent build (System.map))' 1422 @echo ' dir/file.ko - Build module including final link' 1423 @echo ' modules_prepare - Set up for building external modules' 1424 @echo ' tags/TAGS - Generate tags file for editors' 1425 @echo ' cscope - Generate cscope index' 1426 @echo ' gtags - Generate GNU GLOBAL index' 1427 @echo ' kernelrelease - Output the release version string (use with make -s)' 1428 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1429 @echo ' image_name - Output the image name (use with make -s)' 1430 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1431 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1432 echo '' 1433 @echo 'Static analysers:' 1434 @echo ' checkstack - Generate a list of stack hogs' 1435 @echo ' namespacecheck - Name space analysis on compiled kernel' 1436 @echo ' versioncheck - Sanity check on version.h usage' 1437 @echo ' includecheck - Check for duplicate included header files' 1438 @echo ' export_report - List the usages of all exported symbols' 1439 @echo ' headers_check - Sanity check on exported headers' 1440 @echo ' headerdep - Detect inclusion cycles in headers' 1441 @echo ' coccicheck - Check with Coccinelle' 1442 @echo '' 1443 @echo 'Kernel selftest:' 1444 @echo ' kselftest - Build and run kernel selftest (run as root)' 1445 @echo ' Build, install, and boot kernel before' 1446 @echo ' running kselftest on it' 1447 @echo ' kselftest-clean - Remove all generated kselftest files' 1448 @echo ' kselftest-merge - Merge all the config dependencies of kselftest to existing' 1449 @echo ' .config.' 1450 @echo '' 1451 @echo 'Userspace tools targets:' 1452 @echo ' use "make tools/help"' 1453 @echo ' or "cd tools; make help"' 1454 @echo '' 1455 @echo 'Kernel packaging:' 1456 @$(MAKE) $(build)=$(package-dir) help 1457 @echo '' 1458 @echo 'Documentation targets:' 1459 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1460 @echo '' 1461 @echo 'Architecture specific targets ($(SRCARCH)):' 1462 @$(if $(archhelp),$(archhelp),\ 1463 echo ' No architecture specific help defined for $(SRCARCH)') 1464 @echo '' 1465 @$(if $(boards), \ 1466 $(foreach b, $(boards), \ 1467 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1468 echo '') 1469 @$(if $(board-dirs), \ 1470 $(foreach b, $(board-dirs), \ 1471 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1472 printf " %-16s - Show all of the above\\n" help-boards; \ 1473 echo '') 1474 1475 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1476 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1477 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1478 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK (sparse by default)' 1479 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1480 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1481 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where' 1482 @echo ' 1: warnings which may be relevant and do not occur too often' 1483 @echo ' 2: warnings which occur quite often but may still be relevant' 1484 @echo ' 3: more obscure warnings, can most likely be ignored' 1485 @echo ' Multiple levels can be combined with W=12 or W=123' 1486 @echo '' 1487 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1488 @echo 'For further info see the ./README file' 1489 1490 1491help-board-dirs := $(addprefix help-,$(board-dirs)) 1492 1493help-boards: $(help-board-dirs) 1494 1495boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1496 1497$(help-board-dirs): help-%: 1498 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1499 @$(if $(boards-per-dir), \ 1500 $(foreach b, $(boards-per-dir), \ 1501 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1502 echo '') 1503 1504 1505# Documentation targets 1506# --------------------------------------------------------------------------- 1507DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1508 linkcheckdocs dochelp refcheckdocs 1509PHONY += $(DOC_TARGETS) 1510$(DOC_TARGETS): scripts_basic FORCE 1511 $(Q)$(MAKE) $(build)=Documentation $@ 1512 1513else # KBUILD_EXTMOD 1514 1515### 1516# External module support. 1517# When building external modules the kernel used as basis is considered 1518# read-only, and no consistency checks are made and the make 1519# system is not used on the basis kernel. If updates are required 1520# in the basis kernel ordinary make commands (without M=...) must 1521# be used. 1522# 1523# The following are the only valid targets when building external 1524# modules. 1525# make M=dir clean Delete all automatically generated files 1526# make M=dir modules Make all modules in specified dir 1527# make M=dir Same as 'make M=dir modules' 1528# make M=dir modules_install 1529# Install the modules built in the module directory 1530# Assumes install directory is already created 1531 1532# We are always building modules 1533KBUILD_MODULES := 1 1534PHONY += crmodverdir 1535crmodverdir: 1536 $(cmd_crmodverdir) 1537 1538PHONY += $(objtree)/Module.symvers 1539$(objtree)/Module.symvers: 1540 @test -e $(objtree)/Module.symvers || ( \ 1541 echo; \ 1542 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \ 1543 echo " is missing; modules will have no dependencies and modversions."; \ 1544 echo ) 1545 1546module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD)) 1547PHONY += $(module-dirs) modules 1548$(module-dirs): crmodverdir $(objtree)/Module.symvers 1549 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@) 1550 1551modules: $(module-dirs) 1552 @$(kecho) ' Building modules, stage 2.'; 1553 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1554 1555PHONY += modules_install 1556modules_install: _emodinst_ _emodinst_post 1557 1558install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra) 1559PHONY += _emodinst_ 1560_emodinst_: 1561 $(Q)mkdir -p $(MODLIB)/$(install-dir) 1562 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1563 1564PHONY += _emodinst_post 1565_emodinst_post: _emodinst_ 1566 $(call cmd,depmod) 1567 1568clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD)) 1569 1570PHONY += $(clean-dirs) clean 1571$(clean-dirs): 1572 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1573 1574clean: rm-dirs := $(MODVERDIR) 1575clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers 1576 1577PHONY += help 1578help: 1579 @echo ' Building external modules.' 1580 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1581 @echo '' 1582 @echo ' modules - default target, build the module(s)' 1583 @echo ' modules_install - install the module' 1584 @echo ' clean - remove generated files in module directory only' 1585 @echo '' 1586 1587# Dummies... 1588PHONY += prepare scripts 1589prepare: ; 1590scripts: ; 1591endif # KBUILD_EXTMOD 1592 1593clean: $(clean-dirs) 1594 $(call cmd,rmdirs) 1595 $(call cmd,rmfiles) 1596 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1597 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \ 1598 -o -name '*.ko.*' -o -name '*.dtb' -o -name '*.dtb.S' \ 1599 -o -name '*.dwo' -o -name '*.lst' \ 1600 -o -name '*.su' \ 1601 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1602 -o -name '*.symtypes' -o -name 'modules.order' \ 1603 -o -name modules.builtin -o -name '.tmp_*.o.*' \ 1604 -o -name .cache.mk \ 1605 -o -name '*.c.[012]*.*' \ 1606 -o -name '*.ll' \ 1607 -o -name '*.gcno' \) -type f -print | xargs rm -f 1608 1609# Generate tags for editors 1610# --------------------------------------------------------------------------- 1611quiet_cmd_tags = GEN $@ 1612 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@ 1613 1614tags TAGS cscope gtags: FORCE 1615 $(call cmd,tags) 1616 1617# Scripts to check various things for consistency 1618# --------------------------------------------------------------------------- 1619 1620PHONY += includecheck versioncheck coccicheck namespacecheck export_report 1621 1622includecheck: 1623 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1624 -name '*.[hcS]' -type f -print | sort \ 1625 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1626 1627versioncheck: 1628 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1629 -name '*.[hcS]' -type f -print | sort \ 1630 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1631 1632coccicheck: 1633 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@ 1634 1635namespacecheck: 1636 $(PERL) $(srctree)/scripts/namespace.pl 1637 1638export_report: 1639 $(PERL) $(srctree)/scripts/export_report.pl 1640 1641endif #ifeq ($(config-targets),1) 1642endif #ifeq ($(mixed-targets),1) 1643 1644PHONY += checkstack kernelrelease kernelversion image_name 1645 1646# UML needs a little special treatment here. It wants to use the host 1647# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1648# else wants $(ARCH), including people doing cross-builds, which means 1649# that $(SUBARCH) doesn't work here. 1650ifeq ($(ARCH), um) 1651CHECKSTACK_ARCH := $(SUBARCH) 1652else 1653CHECKSTACK_ARCH := $(ARCH) 1654endif 1655checkstack: 1656 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1657 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1658 1659kernelrelease: 1660 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1661 1662kernelversion: 1663 @echo $(KERNELVERSION) 1664 1665image_name: 1666 @echo $(KBUILD_IMAGE) 1667 1668# Clear a bunch of variables before executing the submake 1669tools/: FORCE 1670 $(Q)mkdir -p $(objtree)/tools 1671 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ 1672 1673tools/%: FORCE 1674 $(Q)mkdir -p $(objtree)/tools 1675 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $* 1676 1677# Single targets 1678# --------------------------------------------------------------------------- 1679# Single targets are compatible with: 1680# - build with mixed source and output 1681# - build with separate output dir 'make O=...' 1682# - external modules 1683# 1684# target-dir => where to store outputfile 1685# build-dir => directory in kernel source tree to use 1686 1687ifeq ($(KBUILD_EXTMOD),) 1688 build-dir = $(patsubst %/,%,$(dir $@)) 1689 target-dir = $(dir $@) 1690else 1691 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@))) 1692 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash)) 1693 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@)) 1694endif 1695 1696%.s: %.c prepare scripts FORCE 1697 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1698%.i: %.c prepare scripts FORCE 1699 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1700%.o: %.c prepare scripts FORCE 1701 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1702%.lst: %.c prepare scripts FORCE 1703 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1704%.s: %.S prepare scripts FORCE 1705 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1706%.o: %.S prepare scripts FORCE 1707 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1708%.symtypes: %.c prepare scripts FORCE 1709 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1710%.ll: %.c prepare scripts FORCE 1711 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1712 1713# Modules 1714/: prepare scripts FORCE 1715 $(cmd_crmodverdir) 1716 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1717 $(build)=$(build-dir) 1718# Make sure the latest headers are built for Documentation 1719Documentation/ samples/: headers_install 1720%/: prepare scripts FORCE 1721 $(cmd_crmodverdir) 1722 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1723 $(build)=$(build-dir) 1724%.ko: prepare scripts FORCE 1725 $(cmd_crmodverdir) 1726 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1727 $(build)=$(build-dir) $(@:.ko=.o) 1728 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1729 1730# FIXME Should go into a make.lib or something 1731# =========================================================================== 1732 1733quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs))) 1734 cmd_rmdirs = rm -rf $(rm-dirs) 1735 1736quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1737 cmd_rmfiles = rm -f $(rm-files) 1738 1739# Run depmod only if we have System.map and depmod is executable 1740quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) 1741 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1742 $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))" 1743 1744# Create temporary dir for module support files 1745# clean it up only when building all modules 1746cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \ 1747 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*) 1748 1749# read all saved command lines 1750 1751cmd_files := $(wildcard .*.cmd $(foreach f,$(sort $(targets)),$(dir $(f)).$(notdir $(f)).cmd)) 1752 1753ifneq ($(cmd_files),) 1754 $(cmd_files): ; # Do not try to update included dependency files 1755 include $(cmd_files) 1756endif 1757 1758endif # skip-makefile 1759 1760PHONY += FORCE 1761FORCE: 1762 1763# Declare the contents of the .PHONY variable as phony. We keep that 1764# information in a variable so we can use it in if_changed and friends. 1765.PHONY: $(PHONY) 1766