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 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, unused-variable) 733KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier) 734KBUILD_CFLAGS += $(call cc-disable-warning, gnu) 735KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) 736# Quiet clang warning: comparison of unsigned expression < 0 is always false 737KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare) 738# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the 739# source of a reference will be _MergedGlobals and not on of the whitelisted names. 740# See modpost pattern 2 741KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,) 742KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior) 743KBUILD_CFLAGS += $(call cc-option, -no-integrated-as) 744KBUILD_AFLAGS += $(call cc-option, -no-integrated-as) 745else 746 747# These warnings generated too much noise in a regular build. 748# Use make W=1 to enable them (see scripts/Makefile.extrawarn) 749KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable) 750KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) 751endif 752 753ifdef CONFIG_FRAME_POINTER 754KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 755else 756# Some targets (ARM with Thumb2, for example), can't be built with frame 757# pointers. For those, we don't have FUNCTION_TRACER automatically 758# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 759# incompatible with -fomit-frame-pointer with current GCC, so we don't use 760# -fomit-frame-pointer with FUNCTION_TRACER. 761ifndef CONFIG_FUNCTION_TRACER 762KBUILD_CFLAGS += -fomit-frame-pointer 763endif 764endif 765 766KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments) 767 768ifdef CONFIG_DEBUG_INFO 769ifdef CONFIG_DEBUG_INFO_SPLIT 770KBUILD_CFLAGS += $(call cc-option, -gsplit-dwarf, -g) 771else 772KBUILD_CFLAGS += -g 773endif 774KBUILD_AFLAGS += -Wa,-gdwarf-2 775endif 776ifdef CONFIG_DEBUG_INFO_DWARF4 777KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,) 778endif 779 780ifdef CONFIG_DEBUG_INFO_REDUCED 781KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \ 782 $(call cc-option,-fno-var-tracking) 783endif 784 785ifdef CONFIG_FUNCTION_TRACER 786ifndef CC_FLAGS_FTRACE 787CC_FLAGS_FTRACE := -pg 788endif 789export CC_FLAGS_FTRACE 790ifdef CONFIG_HAVE_FENTRY 791CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY) 792endif 793KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY) 794KBUILD_AFLAGS += $(CC_USING_FENTRY) 795ifdef CONFIG_DYNAMIC_FTRACE 796 ifdef CONFIG_HAVE_C_RECORDMCOUNT 797 BUILD_C_RECORDMCOUNT := y 798 export BUILD_C_RECORDMCOUNT 799 endif 800endif 801endif 802 803# We trigger additional mismatches with less inlining 804ifdef CONFIG_DEBUG_SECTION_MISMATCH 805KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) 806endif 807 808ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 809KBUILD_CFLAGS += $(call cc-option,-ffunction-sections,) 810KBUILD_CFLAGS += $(call cc-option,-fdata-sections,) 811endif 812 813# arch Makefile may override CC so keep this after arch Makefile is included 814NOSTDINC_FLAGS += -nostdinc -isystem $(call shell-cached,$(CC) -print-file-name=include) 815CHECKFLAGS += $(NOSTDINC_FLAGS) 816 817# warn about C99 declaration after statement 818KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,) 819 820# disable pointer signed / unsigned warnings in gcc 4.0 821KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign) 822 823# disable invalid "can't wrap" optimizations for signed / pointers 824KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow) 825 826# Make sure -fstack-check isn't enabled (like gentoo apparently did) 827KBUILD_CFLAGS += $(call cc-option,-fno-stack-check,) 828 829# conserve stack if available 830KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) 831 832# disallow errors like 'EXPORT_GPL(foo);' with missing header 833KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int) 834 835# require functions to have arguments in prototypes, not empty 'int foo()' 836KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes) 837 838# Prohibit date/time macros, which would make the build non-deterministic 839KBUILD_CFLAGS += $(call cc-option,-Werror=date-time) 840 841# enforce correct pointer usage 842KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 843 844# Require designated initializers for all marked structures 845KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) 846 847# use the deterministic mode of AR if available 848KBUILD_ARFLAGS := $(call ar-option,D) 849 850include scripts/Makefile.kasan 851include scripts/Makefile.extrawarn 852include scripts/Makefile.ubsan 853 854# Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the 855# last assignments 856KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS) 857KBUILD_AFLAGS += $(ARCH_AFLAGS) $(KAFLAGS) 858KBUILD_CFLAGS += $(ARCH_CFLAGS) $(KCFLAGS) 859 860# Use --build-id when available. 861LDFLAGS_BUILD_ID := $(patsubst -Wl$(comma)%,%,\ 862 $(call cc-ldoption, -Wl$(comma)--build-id,)) 863KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID) 864LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID) 865 866ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 867LDFLAGS_vmlinux += $(call ld-option, --gc-sections,) 868endif 869 870ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 871LDFLAGS_vmlinux += $(call ld-option, -X,) 872endif 873 874# Default kernel image to build when no specific target is given. 875# KBUILD_IMAGE may be overruled on the command line or 876# set in the environment 877# Also any assignments in arch/$(ARCH)/Makefile take precedence over 878# this default value 879export KBUILD_IMAGE ?= vmlinux 880 881# 882# INSTALL_PATH specifies where to place the updated kernel and system map 883# images. Default is /boot, but you can set it to other values 884export INSTALL_PATH ?= /boot 885 886# 887# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 888# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 889# an argument if needed. Otherwise it defaults to the kernel install path 890# 891export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 892 893# 894# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 895# relocations required by build roots. This is not defined in the 896# makefile but the argument can be passed to make if needed. 897# 898 899MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 900export MODLIB 901 902# 903# INSTALL_MOD_STRIP, if defined, will cause modules to be 904# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then 905# the default option --strip-debug will be used. Otherwise, 906# INSTALL_MOD_STRIP value will be used as the options to the strip command. 907 908ifdef INSTALL_MOD_STRIP 909ifeq ($(INSTALL_MOD_STRIP),1) 910mod_strip_cmd = $(STRIP) --strip-debug 911else 912mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP) 913endif # INSTALL_MOD_STRIP=1 914else 915mod_strip_cmd = true 916endif # INSTALL_MOD_STRIP 917export mod_strip_cmd 918 919# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed 920# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP 921# or CONFIG_MODULE_COMPRESS_XZ. 922 923mod_compress_cmd = true 924ifdef CONFIG_MODULE_COMPRESS 925 ifdef CONFIG_MODULE_COMPRESS_GZIP 926 mod_compress_cmd = gzip -n -f 927 endif # CONFIG_MODULE_COMPRESS_GZIP 928 ifdef CONFIG_MODULE_COMPRESS_XZ 929 mod_compress_cmd = xz -f 930 endif # CONFIG_MODULE_COMPRESS_XZ 931endif # CONFIG_MODULE_COMPRESS 932export mod_compress_cmd 933 934# Select initial ramdisk compression format, default is gzip(1). 935# This shall be used by the dracut(8) tool while creating an initramfs image. 936# 937INITRD_COMPRESS-y := gzip 938INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2 939INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma 940INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz 941INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo 942INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4 943# do not export INITRD_COMPRESS, since we didn't actually 944# choose a sane default compression above. 945# export INITRD_COMPRESS := $(INITRD_COMPRESS-y) 946 947ifdef CONFIG_MODULE_SIG_ALL 948$(eval $(call config_filename,MODULE_SIG_KEY)) 949 950mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509 951else 952mod_sign_cmd = true 953endif 954export mod_sign_cmd 955 956ifdef CONFIG_STACK_VALIDATION 957 has_libelf := $(call try-run,\ 958 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0) 959 ifeq ($(has_libelf),1) 960 objtool_target := tools/objtool FORCE 961 else 962 ifdef CONFIG_UNWINDER_ORC 963 $(error "Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel") 964 else 965 $(warning "Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel") 966 endif 967 SKIP_STACK_VALIDATION := 1 968 export SKIP_STACK_VALIDATION 969 endif 970endif 971 972 973ifeq ($(KBUILD_EXTMOD),) 974core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/ 975 976vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \ 977 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 978 $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y))) 979 980vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \ 981 $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-)))) 982 983init-y := $(patsubst %/, %/built-in.o, $(init-y)) 984core-y := $(patsubst %/, %/built-in.o, $(core-y)) 985drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y)) 986net-y := $(patsubst %/, %/built-in.o, $(net-y)) 987libs-y1 := $(patsubst %/, %/lib.a, $(libs-y)) 988libs-y2 := $(filter-out %.a, $(patsubst %/, %/built-in.o, $(libs-y))) 989virt-y := $(patsubst %/, %/built-in.o, $(virt-y)) 990 991# Externally visible symbols (used by link-vmlinux.sh) 992export KBUILD_VMLINUX_INIT := $(head-y) $(init-y) 993export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y2) $(drivers-y) $(net-y) $(virt-y) 994export KBUILD_VMLINUX_LIBS := $(libs-y1) 995export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 996export LDFLAGS_vmlinux 997# used by scripts/package/Makefile 998export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools) 999 1000vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) $(KBUILD_VMLINUX_LIBS) 1001 1002# Include targets which we want to execute sequentially if the rest of the 1003# kernel build went well. If CONFIG_TRIM_UNUSED_KSYMS is set, this might be 1004# evaluated more than once. 1005PHONY += vmlinux_prereq 1006vmlinux_prereq: $(vmlinux-deps) FORCE 1007ifdef CONFIG_HEADERS_CHECK 1008 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check 1009endif 1010ifdef CONFIG_GDB_SCRIPTS 1011 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1012endif 1013ifdef CONFIG_TRIM_UNUSED_KSYMS 1014 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ 1015 "$(MAKE) -f $(srctree)/Makefile vmlinux" 1016endif 1017 1018# standalone target for easier testing 1019include/generated/autoksyms.h: FORCE 1020 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh true 1021 1022ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink) 1023 1024# Final link of vmlinux with optional arch pass after final link 1025cmd_link-vmlinux = \ 1026 $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) ; \ 1027 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) 1028 1029vmlinux: scripts/link-vmlinux.sh vmlinux_prereq $(vmlinux-deps) FORCE 1030 +$(call if_changed,link-vmlinux) 1031 1032# Build samples along the rest of the kernel 1033ifdef CONFIG_SAMPLES 1034vmlinux-dirs += samples 1035endif 1036 1037# The actual objects are generated when descending, 1038# make sure no implicit rule kicks in 1039$(sort $(vmlinux-deps)): $(vmlinux-dirs) ; 1040 1041# Handle descending into subdirectories listed in $(vmlinux-dirs) 1042# Preset locale variables to speed up the build process. Limit locale 1043# tweaks to this spot to avoid wrong language settings when running 1044# make menuconfig etc. 1045# Error messages still appears in the original language 1046 1047PHONY += $(vmlinux-dirs) 1048$(vmlinux-dirs): prepare scripts 1049 $(Q)$(MAKE) $(build)=$@ need-builtin=1 1050 1051define filechk_kernel.release 1052 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1053endef 1054 1055# Store (new) KERNELRELEASE string in include/config/kernel.release 1056include/config/kernel.release: include/config/auto.conf FORCE 1057 $(call filechk,kernel.release) 1058 1059 1060# Things we need to do before we recursively start building the kernel 1061# or the modules are listed in "prepare". 1062# A multi level approach is used. prepareN is processed before prepareN-1. 1063# archprepare is used in arch Makefiles and when processed asm symlink, 1064# version.h and scripts_basic is processed / created. 1065 1066# Listed in dependency order 1067PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3 1068 1069# prepare3 is used to check if we are building in a separate output directory, 1070# and if so do: 1071# 1) Check that make has not been executed in the kernel src $(srctree) 1072prepare3: include/config/kernel.release 1073ifneq ($(KBUILD_SRC),) 1074 @$(kecho) ' Using $(srctree) as source for kernel' 1075 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \ 1076 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \ 1077 echo >&2 " in the '$(srctree)' directory.";\ 1078 /bin/false; \ 1079 fi; 1080endif 1081 1082# prepare2 creates a makefile if using a separate output directory. 1083# From this point forward, .config has been reprocessed, so any rules 1084# that need to depend on updated CONFIG_* values can be checked here. 1085prepare2: prepare3 prepare-compiler-check outputmakefile asm-generic 1086 1087prepare1: prepare2 $(version_h) include/generated/utsrelease.h \ 1088 include/config/auto.conf 1089 $(cmd_crmodverdir) 1090 1091archprepare: archheaders archscripts prepare1 scripts_basic 1092 1093prepare0: archprepare gcc-plugins 1094 $(Q)$(MAKE) $(build)=. 1095 1096# All the preparing.. 1097prepare: prepare0 prepare-objtool 1098 1099# Support for using generic headers in asm-generic 1100PHONY += asm-generic uapi-asm-generic 1101asm-generic: uapi-asm-generic 1102 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \ 1103 src=asm obj=arch/$(SRCARCH)/include/generated/asm 1104uapi-asm-generic: 1105 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \ 1106 src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm 1107 1108PHONY += prepare-objtool 1109prepare-objtool: $(objtool_target) 1110 1111# Check for CONFIG flags that require compiler support. Abort the build 1112# after .config has been processed, but before the kernel build starts. 1113# 1114# For security-sensitive CONFIG options, we don't want to fallback and/or 1115# silently change which compiler flags will be used, since that leads to 1116# producing kernels with different security feature characteristics 1117# depending on the compiler used. (For example, "But I selected 1118# CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!") 1119PHONY += prepare-compiler-check 1120prepare-compiler-check: FORCE 1121# Make sure compiler supports requested stack protector flag. 1122ifdef stackp-name 1123 # Warn about CONFIG_CC_STACKPROTECTOR_AUTO having found no option. 1124 ifeq ($(stackp-flag),) 1125 @echo CONFIG_CC_STACKPROTECTOR_$(stackp-name): \ 1126 Compiler does not support any known stack-protector >&2 1127 else 1128 # Fail if specifically requested stack protector is missing. 1129 ifeq ($(call cc-option, $(stackp-flag)),) 1130 @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \ 1131 $(stackp-flag) not supported by compiler >&2 && exit 1 1132 endif 1133 endif 1134endif 1135# Make sure compiler does not have buggy stack-protector support. If a 1136# specific stack-protector was requested, fail the build, otherwise warn. 1137ifdef stackp-broken 1138 ifeq ($(stackp-name),AUTO) 1139 @echo CONFIG_CC_STACKPROTECTOR_$(stackp-name): \ 1140 $(stackp-flag) available but compiler is broken: disabling >&2 1141 else 1142 @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \ 1143 $(stackp-flag) available but compiler is broken >&2 && exit 1 1144 endif 1145endif 1146 @: 1147 1148# Generate some files 1149# --------------------------------------------------------------------------- 1150 1151# KERNELRELEASE can change from a few different places, meaning version.h 1152# needs to be updated, so this check is forced on all builds 1153 1154uts_len := 64 1155define filechk_utsrelease.h 1156 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1157 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1158 exit 1; \ 1159 fi; \ 1160 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";) 1161endef 1162 1163define filechk_version.h 1164 (echo \#define LINUX_VERSION_CODE $(shell \ 1165 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \ 1166 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';) 1167endef 1168 1169$(version_h): $(srctree)/Makefile FORCE 1170 $(call filechk,version.h) 1171 $(Q)rm -f $(old_version_h) 1172 1173include/generated/utsrelease.h: include/config/kernel.release FORCE 1174 $(call filechk,utsrelease.h) 1175 1176PHONY += headerdep 1177headerdep: 1178 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1179 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1180 1181# --------------------------------------------------------------------------- 1182# Kernel headers 1183 1184#Default location for installed headers 1185export INSTALL_HDR_PATH = $(objtree)/usr 1186 1187# If we do an all arch process set dst to include/arch-$(SRCARCH) 1188hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(SRCARCH), dst=include) 1189 1190PHONY += archheaders 1191archheaders: 1192 1193PHONY += archscripts 1194archscripts: 1195 1196PHONY += __headers 1197__headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts 1198 $(Q)$(MAKE) $(build)=scripts build_unifdef 1199 1200PHONY += headers_install_all 1201headers_install_all: 1202 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install 1203 1204PHONY += headers_install 1205headers_install: __headers 1206 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \ 1207 $(error Headers not exportable for the $(SRCARCH) architecture)) 1208 $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include 1209 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) 1210 1211PHONY += headers_check_all 1212headers_check_all: headers_install_all 1213 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check 1214 1215PHONY += headers_check 1216headers_check: headers_install 1217 $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1 1218 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) HDRCHECK=1 1219 1220# --------------------------------------------------------------------------- 1221# Kernel selftest 1222 1223PHONY += kselftest 1224kselftest: 1225 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1226 1227PHONY += kselftest-clean 1228kselftest-clean: 1229 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean 1230 1231PHONY += kselftest-merge 1232kselftest-merge: 1233 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1234 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \ 1235 -m $(objtree)/.config \ 1236 $(srctree)/tools/testing/selftests/*/config 1237 +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1238 1239# --------------------------------------------------------------------------- 1240# Modules 1241 1242ifdef CONFIG_MODULES 1243 1244# By default, build modules as well 1245 1246all: modules 1247 1248# Build modules 1249# 1250# A module can be listed more than once in obj-m resulting in 1251# duplicate lines in modules.order files. Those are removed 1252# using awk while concatenating to the final file. 1253 1254PHONY += modules 1255modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin 1256 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order 1257 @$(kecho) ' Building modules, stage 2.'; 1258 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1259 1260modules.builtin: $(vmlinux-dirs:%=%/modules.builtin) 1261 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin 1262 1263%/modules.builtin: include/config/auto.conf 1264 $(Q)$(MAKE) $(modbuiltin)=$* 1265 1266 1267# Target to prepare building external modules 1268PHONY += modules_prepare 1269modules_prepare: prepare scripts 1270 1271# Target to install modules 1272PHONY += modules_install 1273modules_install: _modinst_ _modinst_post 1274 1275PHONY += _modinst_ 1276_modinst_: 1277 @rm -rf $(MODLIB)/kernel 1278 @rm -f $(MODLIB)/source 1279 @mkdir -p $(MODLIB)/kernel 1280 @ln -s $(abspath $(srctree)) $(MODLIB)/source 1281 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1282 rm -f $(MODLIB)/build ; \ 1283 ln -s $(CURDIR) $(MODLIB)/build ; \ 1284 fi 1285 @cp -f $(objtree)/modules.order $(MODLIB)/ 1286 @cp -f $(objtree)/modules.builtin $(MODLIB)/ 1287 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1288 1289# This depmod is only for convenience to give the initial 1290# boot a modules.dep even before / is mounted read-write. However the 1291# boot script depmod is the master version. 1292PHONY += _modinst_post 1293_modinst_post: _modinst_ 1294 $(call cmd,depmod) 1295 1296ifeq ($(CONFIG_MODULE_SIG), y) 1297PHONY += modules_sign 1298modules_sign: 1299 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign 1300endif 1301 1302else # CONFIG_MODULES 1303 1304# Modules not configured 1305# --------------------------------------------------------------------------- 1306 1307PHONY += modules modules_install 1308modules modules_install: 1309 @echo >&2 1310 @echo >&2 "The present kernel configuration has modules disabled." 1311 @echo >&2 "Type 'make config' and enable loadable module support." 1312 @echo >&2 "Then build a kernel with module support enabled." 1313 @echo >&2 1314 @exit 1 1315 1316endif # CONFIG_MODULES 1317 1318### 1319# Cleaning is done on three levels. 1320# make clean Delete most generated files 1321# Leave enough to build external modules 1322# make mrproper Delete the current configuration, and all generated files 1323# make distclean Remove editor backup files, patch leftover files and the like 1324 1325# Directories & files removed with 'make clean' 1326CLEAN_DIRS += $(MODVERDIR) 1327 1328# Directories & files removed with 'make mrproper' 1329MRPROPER_DIRS += include/config usr/include include/generated \ 1330 arch/*/include/generated .tmp_objdiff 1331MRPROPER_FILES += .config .config.old .version \ 1332 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \ 1333 signing_key.pem signing_key.priv signing_key.x509 \ 1334 x509.genkey extra_certificates signing_key.x509.keyid \ 1335 signing_key.x509.signer vmlinux-gdb.py 1336 1337# clean - Delete most, but leave enough to build external modules 1338# 1339clean: rm-dirs := $(CLEAN_DIRS) 1340clean: rm-files := $(CLEAN_FILES) 1341clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples) 1342 1343PHONY += $(clean-dirs) clean archclean vmlinuxclean 1344$(clean-dirs): 1345 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1346 1347vmlinuxclean: 1348 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1349 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1350 1351clean: archclean vmlinuxclean 1352 1353# mrproper - Delete all generated files, including .config 1354# 1355mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS)) 1356mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1357mrproper-dirs := $(addprefix _mrproper_,scripts) 1358 1359PHONY += $(mrproper-dirs) mrproper archmrproper 1360$(mrproper-dirs): 1361 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1362 1363mrproper: clean archmrproper $(mrproper-dirs) 1364 $(call cmd,rmdirs) 1365 $(call cmd,rmfiles) 1366 1367# distclean 1368# 1369PHONY += distclean 1370 1371distclean: mrproper 1372 @find $(srctree) $(RCS_FIND_IGNORE) \ 1373 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1374 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1375 -o -name 'core' \) \ 1376 -type f -print | xargs rm -f 1377 1378 1379# Packaging of the kernel to various formats 1380# --------------------------------------------------------------------------- 1381# rpm target kept for backward compatibility 1382package-dir := scripts/package 1383 1384%src-pkg: FORCE 1385 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1386%pkg: include/config/kernel.release FORCE 1387 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1388rpm: rpm-pkg 1389 @echo " WARNING: \"rpm\" target will be removed after Linux 4.18" 1390 @echo " Please use \"rpm-pkg\" instead." 1391 1392 1393# Brief documentation of the typical targets used 1394# --------------------------------------------------------------------------- 1395 1396boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1397boards := $(sort $(notdir $(boards))) 1398board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1399board-dirs := $(sort $(notdir $(board-dirs:/=))) 1400 1401PHONY += help 1402help: 1403 @echo 'Cleaning targets:' 1404 @echo ' clean - Remove most generated files but keep the config and' 1405 @echo ' enough build support to build external modules' 1406 @echo ' mrproper - Remove all generated files + config + various backup files' 1407 @echo ' distclean - mrproper + remove editor backup and patch files' 1408 @echo '' 1409 @echo 'Configuration targets:' 1410 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1411 @echo '' 1412 @echo 'Other generic targets:' 1413 @echo ' all - Build all targets marked with [*]' 1414 @echo '* vmlinux - Build the bare kernel' 1415 @echo '* modules - Build all modules' 1416 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1417 @echo ' dir/ - Build all files in dir and below' 1418 @echo ' dir/file.[ois] - Build specified target only' 1419 @echo ' dir/file.ll - Build the LLVM assembly file' 1420 @echo ' (requires compiler support for LLVM assembly generation)' 1421 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1422 @echo ' (requires a recent binutils and recent build (System.map))' 1423 @echo ' dir/file.ko - Build module including final link' 1424 @echo ' modules_prepare - Set up for building external modules' 1425 @echo ' tags/TAGS - Generate tags file for editors' 1426 @echo ' cscope - Generate cscope index' 1427 @echo ' gtags - Generate GNU GLOBAL index' 1428 @echo ' kernelrelease - Output the release version string (use with make -s)' 1429 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1430 @echo ' image_name - Output the image name (use with make -s)' 1431 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1432 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1433 echo '' 1434 @echo 'Static analysers:' 1435 @echo ' checkstack - Generate a list of stack hogs' 1436 @echo ' namespacecheck - Name space analysis on compiled kernel' 1437 @echo ' versioncheck - Sanity check on version.h usage' 1438 @echo ' includecheck - Check for duplicate included header files' 1439 @echo ' export_report - List the usages of all exported symbols' 1440 @echo ' headers_check - Sanity check on exported headers' 1441 @echo ' headerdep - Detect inclusion cycles in headers' 1442 @echo ' coccicheck - Check with Coccinelle' 1443 @echo '' 1444 @echo 'Kernel selftest:' 1445 @echo ' kselftest - Build and run kernel selftest (run as root)' 1446 @echo ' Build, install, and boot kernel before' 1447 @echo ' running kselftest on it' 1448 @echo ' kselftest-clean - Remove all generated kselftest files' 1449 @echo ' kselftest-merge - Merge all the config dependencies of kselftest to existing' 1450 @echo ' .config.' 1451 @echo '' 1452 @echo 'Userspace tools targets:' 1453 @echo ' use "make tools/help"' 1454 @echo ' or "cd tools; make help"' 1455 @echo '' 1456 @echo 'Kernel packaging:' 1457 @$(MAKE) $(build)=$(package-dir) help 1458 @echo '' 1459 @echo 'Documentation targets:' 1460 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1461 @echo '' 1462 @echo 'Architecture specific targets ($(SRCARCH)):' 1463 @$(if $(archhelp),$(archhelp),\ 1464 echo ' No architecture specific help defined for $(SRCARCH)') 1465 @echo '' 1466 @$(if $(boards), \ 1467 $(foreach b, $(boards), \ 1468 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1469 echo '') 1470 @$(if $(board-dirs), \ 1471 $(foreach b, $(board-dirs), \ 1472 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1473 printf " %-16s - Show all of the above\\n" help-boards; \ 1474 echo '') 1475 1476 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1477 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1478 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1479 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK (sparse by default)' 1480 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1481 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1482 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where' 1483 @echo ' 1: warnings which may be relevant and do not occur too often' 1484 @echo ' 2: warnings which occur quite often but may still be relevant' 1485 @echo ' 3: more obscure warnings, can most likely be ignored' 1486 @echo ' Multiple levels can be combined with W=12 or W=123' 1487 @echo '' 1488 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1489 @echo 'For further info see the ./README file' 1490 1491 1492help-board-dirs := $(addprefix help-,$(board-dirs)) 1493 1494help-boards: $(help-board-dirs) 1495 1496boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1497 1498$(help-board-dirs): help-%: 1499 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1500 @$(if $(boards-per-dir), \ 1501 $(foreach b, $(boards-per-dir), \ 1502 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1503 echo '') 1504 1505 1506# Documentation targets 1507# --------------------------------------------------------------------------- 1508DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1509 linkcheckdocs dochelp refcheckdocs 1510PHONY += $(DOC_TARGETS) 1511$(DOC_TARGETS): scripts_basic FORCE 1512 $(Q)$(MAKE) $(build)=Documentation $@ 1513 1514else # KBUILD_EXTMOD 1515 1516### 1517# External module support. 1518# When building external modules the kernel used as basis is considered 1519# read-only, and no consistency checks are made and the make 1520# system is not used on the basis kernel. If updates are required 1521# in the basis kernel ordinary make commands (without M=...) must 1522# be used. 1523# 1524# The following are the only valid targets when building external 1525# modules. 1526# make M=dir clean Delete all automatically generated files 1527# make M=dir modules Make all modules in specified dir 1528# make M=dir Same as 'make M=dir modules' 1529# make M=dir modules_install 1530# Install the modules built in the module directory 1531# Assumes install directory is already created 1532 1533# We are always building modules 1534KBUILD_MODULES := 1 1535PHONY += crmodverdir 1536crmodverdir: 1537 $(cmd_crmodverdir) 1538 1539PHONY += $(objtree)/Module.symvers 1540$(objtree)/Module.symvers: 1541 @test -e $(objtree)/Module.symvers || ( \ 1542 echo; \ 1543 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \ 1544 echo " is missing; modules will have no dependencies and modversions."; \ 1545 echo ) 1546 1547module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD)) 1548PHONY += $(module-dirs) modules 1549$(module-dirs): crmodverdir $(objtree)/Module.symvers 1550 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@) 1551 1552modules: $(module-dirs) 1553 @$(kecho) ' Building modules, stage 2.'; 1554 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1555 1556PHONY += modules_install 1557modules_install: _emodinst_ _emodinst_post 1558 1559install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra) 1560PHONY += _emodinst_ 1561_emodinst_: 1562 $(Q)mkdir -p $(MODLIB)/$(install-dir) 1563 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1564 1565PHONY += _emodinst_post 1566_emodinst_post: _emodinst_ 1567 $(call cmd,depmod) 1568 1569clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD)) 1570 1571PHONY += $(clean-dirs) clean 1572$(clean-dirs): 1573 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1574 1575clean: rm-dirs := $(MODVERDIR) 1576clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers 1577 1578PHONY += help 1579help: 1580 @echo ' Building external modules.' 1581 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1582 @echo '' 1583 @echo ' modules - default target, build the module(s)' 1584 @echo ' modules_install - install the module' 1585 @echo ' clean - remove generated files in module directory only' 1586 @echo '' 1587 1588# Dummies... 1589PHONY += prepare scripts 1590prepare: ; 1591scripts: ; 1592endif # KBUILD_EXTMOD 1593 1594clean: $(clean-dirs) 1595 $(call cmd,rmdirs) 1596 $(call cmd,rmfiles) 1597 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1598 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \ 1599 -o -name '*.ko.*' -o -name '*.dtb' -o -name '*.dtb.S' \ 1600 -o -name '*.dwo' -o -name '*.lst' \ 1601 -o -name '*.su' \ 1602 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1603 -o -name '*.symtypes' -o -name 'modules.order' \ 1604 -o -name modules.builtin -o -name '.tmp_*.o.*' \ 1605 -o -name .cache.mk \ 1606 -o -name '*.c.[012]*.*' \ 1607 -o -name '*.ll' \ 1608 -o -name '*.gcno' \) -type f -print | xargs rm -f 1609 1610# Generate tags for editors 1611# --------------------------------------------------------------------------- 1612quiet_cmd_tags = GEN $@ 1613 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@ 1614 1615tags TAGS cscope gtags: FORCE 1616 $(call cmd,tags) 1617 1618# Scripts to check various things for consistency 1619# --------------------------------------------------------------------------- 1620 1621PHONY += includecheck versioncheck coccicheck namespacecheck export_report 1622 1623includecheck: 1624 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1625 -name '*.[hcS]' -type f -print | sort \ 1626 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1627 1628versioncheck: 1629 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1630 -name '*.[hcS]' -type f -print | sort \ 1631 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1632 1633coccicheck: 1634 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@ 1635 1636namespacecheck: 1637 $(PERL) $(srctree)/scripts/namespace.pl 1638 1639export_report: 1640 $(PERL) $(srctree)/scripts/export_report.pl 1641 1642endif #ifeq ($(config-targets),1) 1643endif #ifeq ($(mixed-targets),1) 1644 1645PHONY += checkstack kernelrelease kernelversion image_name 1646 1647# UML needs a little special treatment here. It wants to use the host 1648# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1649# else wants $(ARCH), including people doing cross-builds, which means 1650# that $(SUBARCH) doesn't work here. 1651ifeq ($(ARCH), um) 1652CHECKSTACK_ARCH := $(SUBARCH) 1653else 1654CHECKSTACK_ARCH := $(ARCH) 1655endif 1656checkstack: 1657 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1658 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1659 1660kernelrelease: 1661 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1662 1663kernelversion: 1664 @echo $(KERNELVERSION) 1665 1666image_name: 1667 @echo $(KBUILD_IMAGE) 1668 1669# Clear a bunch of variables before executing the submake 1670tools/: FORCE 1671 $(Q)mkdir -p $(objtree)/tools 1672 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ 1673 1674tools/%: FORCE 1675 $(Q)mkdir -p $(objtree)/tools 1676 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $* 1677 1678# Single targets 1679# --------------------------------------------------------------------------- 1680# Single targets are compatible with: 1681# - build with mixed source and output 1682# - build with separate output dir 'make O=...' 1683# - external modules 1684# 1685# target-dir => where to store outputfile 1686# build-dir => directory in kernel source tree to use 1687 1688ifeq ($(KBUILD_EXTMOD),) 1689 build-dir = $(patsubst %/,%,$(dir $@)) 1690 target-dir = $(dir $@) 1691else 1692 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@))) 1693 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash)) 1694 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@)) 1695endif 1696 1697%.s: %.c prepare scripts FORCE 1698 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1699%.i: %.c prepare scripts FORCE 1700 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1701%.o: %.c prepare scripts FORCE 1702 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1703%.lst: %.c prepare scripts FORCE 1704 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1705%.s: %.S prepare scripts FORCE 1706 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1707%.o: %.S prepare scripts FORCE 1708 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1709%.symtypes: %.c prepare scripts FORCE 1710 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1711%.ll: %.c prepare scripts FORCE 1712 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1713 1714# Modules 1715/: prepare scripts FORCE 1716 $(cmd_crmodverdir) 1717 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1718 $(build)=$(build-dir) 1719# Make sure the latest headers are built for Documentation 1720Documentation/ samples/: headers_install 1721%/: prepare scripts FORCE 1722 $(cmd_crmodverdir) 1723 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1724 $(build)=$(build-dir) 1725%.ko: prepare scripts FORCE 1726 $(cmd_crmodverdir) 1727 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1728 $(build)=$(build-dir) $(@:.ko=.o) 1729 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1730 1731# FIXME Should go into a make.lib or something 1732# =========================================================================== 1733 1734quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs))) 1735 cmd_rmdirs = rm -rf $(rm-dirs) 1736 1737quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1738 cmd_rmfiles = rm -f $(rm-files) 1739 1740# Run depmod only if we have System.map and depmod is executable 1741quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) 1742 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1743 $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))" 1744 1745# Create temporary dir for module support files 1746# clean it up only when building all modules 1747cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \ 1748 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*) 1749 1750# read all saved command lines 1751 1752cmd_files := $(wildcard .*.cmd $(foreach f,$(sort $(targets)),$(dir $(f)).$(notdir $(f)).cmd)) 1753 1754ifneq ($(cmd_files),) 1755 $(cmd_files): ; # Do not try to update included dependency files 1756 include $(cmd_files) 1757endif 1758 1759endif # skip-makefile 1760 1761PHONY += FORCE 1762FORCE: 1763 1764# Declare the contents of the .PHONY variable as phony. We keep that 1765# information in a variable so we can use it in if_changed and friends. 1766.PHONY: $(PHONY) 1767