1# SPDX-License-Identifier: GPL-2.0 2VERSION = 4 3PATCHLEVEL = 16 4SUBLEVEL = 0 5EXTRAVERSION = -rc4 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 -Wno-unknown-attribute $(CF) 392NOSTDINC_FLAGS = 393CFLAGS_MODULE = 394AFLAGS_MODULE = 395LDFLAGS_MODULE = 396CFLAGS_KERNEL = 397AFLAGS_KERNEL = 398LDFLAGS_vmlinux = 399 400# Use USERINCLUDE when you must reference the UAPI directories only. 401USERINCLUDE := \ 402 -I$(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 492RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register 493RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk 494RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG))) 495export RETPOLINE_CFLAGS 496 497ifeq ($(config-targets),1) 498# =========================================================================== 499# *config targets only - make sure prerequisites are updated, and descend 500# in scripts/kconfig to make the *config target 501 502# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 503# KBUILD_DEFCONFIG may point out an alternative default configuration 504# used for 'make defconfig' 505include arch/$(SRCARCH)/Makefile 506export KBUILD_DEFCONFIG KBUILD_KCONFIG 507 508config: scripts_basic outputmakefile FORCE 509 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 510 511%config: scripts_basic outputmakefile FORCE 512 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 513 514else 515# =========================================================================== 516# Build targets only - this includes vmlinux, arch specific targets, clean 517# targets and others. In general all targets except *config targets. 518 519# If building an external module we do not care about the all: rule 520# but instead _all depend on modules 521PHONY += all 522ifeq ($(KBUILD_EXTMOD),) 523_all: all 524else 525_all: modules 526endif 527 528# Decide whether to build built-in, modular, or both. 529# Normally, just do built-in. 530 531KBUILD_MODULES := 532KBUILD_BUILTIN := 1 533 534# If we have only "make modules", don't compile built-in objects. 535# When we're building modules with modversions, we need to consider 536# the built-in objects during the descend as well, in order to 537# make sure the checksums are up to date before we record them. 538 539ifeq ($(MAKECMDGOALS),modules) 540 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1) 541endif 542 543# If we have "make <whatever> modules", compile modules 544# in addition to whatever we do anyway. 545# Just "make" or "make all" shall build modules as well 546 547ifneq ($(filter all _all modules,$(MAKECMDGOALS)),) 548 KBUILD_MODULES := 1 549endif 550 551ifeq ($(MAKECMDGOALS),) 552 KBUILD_MODULES := 1 553endif 554 555export KBUILD_MODULES KBUILD_BUILTIN 556 557ifeq ($(KBUILD_EXTMOD),) 558# Additional helpers built in scripts/ 559# Carefully list dependencies so we do not try to build scripts twice 560# in parallel 561PHONY += scripts 562scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \ 563 asm-generic gcc-plugins 564 $(Q)$(MAKE) $(build)=$(@) 565 566# Objects we will link into vmlinux / subdirs we need to visit 567init-y := init/ 568drivers-y := drivers/ sound/ firmware/ 569net-y := net/ 570libs-y := lib/ 571core-y := usr/ 572virt-y := virt/ 573endif # KBUILD_EXTMOD 574 575ifeq ($(dot-config),1) 576# Read in config 577-include include/config/auto.conf 578 579ifeq ($(KBUILD_EXTMOD),) 580# Read in dependencies to all Kconfig* files, make sure to run 581# oldconfig if changes are detected. 582-include include/config/auto.conf.cmd 583 584# To avoid any implicit rule to kick in, define an empty command 585$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ; 586 587# The actual configuration files used during the build are stored in 588# include/generated/ and include/config/. Update them if .config is newer than 589# include/config/auto.conf (which mirrors .config). 590include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd 591 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig 592else 593# external modules needs include/generated/autoconf.h and include/config/auto.conf 594# but do not care if they are up-to-date. Use auto.conf to trigger the test 595PHONY += include/config/auto.conf 596 597include/config/auto.conf: 598 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 599 echo >&2; \ 600 echo >&2 " ERROR: Kernel configuration is invalid."; \ 601 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 602 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 603 echo >&2 ; \ 604 /bin/false) 605 606endif # KBUILD_EXTMOD 607 608else 609# Dummy target needed, because used as prerequisite 610include/config/auto.conf: ; 611endif # $(dot-config) 612 613# For the kernel to actually contain only the needed exported symbols, 614# we have to build modules as well to determine what those symbols are. 615# (this can be evaluated only once include/config/auto.conf has been included) 616ifdef CONFIG_TRIM_UNUSED_KSYMS 617 KBUILD_MODULES := 1 618endif 619 620# The all: target is the default when no target is given on the 621# command line. 622# This allow a user to issue only 'make' to build a kernel including modules 623# Defaults to vmlinux, but the arch makefile usually adds further targets 624all: vmlinux 625 626KBUILD_CFLAGS += $(call cc-option,-fno-PIE) 627KBUILD_AFLAGS += $(call cc-option,-fno-PIE) 628CFLAGS_GCOV := -fprofile-arcs -ftest-coverage -fno-tree-loop-im $(call cc-disable-warning,maybe-uninitialized,) 629export CFLAGS_GCOV CFLAGS_KCOV 630 631# The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default 632# values of the respective KBUILD_* variables 633ARCH_CPPFLAGS := 634ARCH_AFLAGS := 635ARCH_CFLAGS := 636include arch/$(SRCARCH)/Makefile 637 638KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,) 639KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) 640KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) 641KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) 642KBUILD_CFLAGS += $(call cc-disable-warning, int-in-bool-context) 643 644ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 645KBUILD_CFLAGS += $(call cc-option,-Oz,-Os) 646KBUILD_CFLAGS += $(call cc-disable-warning,maybe-uninitialized,) 647else 648ifdef CONFIG_PROFILE_ALL_BRANCHES 649KBUILD_CFLAGS += -O2 $(call cc-disable-warning,maybe-uninitialized,) 650else 651KBUILD_CFLAGS += -O2 652endif 653endif 654 655KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \ 656 $(call cc-disable-warning,maybe-uninitialized,)) 657 658# Tell gcc to never replace conditional load with a non-conditional one 659KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 660 661# check for 'asm goto' 662ifeq ($(call shell-cached,$(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y) 663 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO 664 KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO 665endif 666 667include scripts/Makefile.kcov 668include scripts/Makefile.gcc-plugins 669 670ifdef CONFIG_READABLE_ASM 671# Disable optimizations that make assembler listings hard to read. 672# reorder blocks reorders the control in the function 673# ipa clone creates specialized cloned functions 674# partial inlining inlines only parts of functions 675KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \ 676 $(call cc-option,-fno-ipa-cp-clone,) \ 677 $(call cc-option,-fno-partial-inlining) 678endif 679 680ifneq ($(CONFIG_FRAME_WARN),0) 681KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN}) 682endif 683 684# This selects the stack protector compiler flag. Testing it is delayed 685# until after .config has been reprocessed, in the prepare-compiler-check 686# target. 687ifdef CONFIG_CC_STACKPROTECTOR_AUTO 688 stackp-flag := $(call cc-option,-fstack-protector-strong,$(call cc-option,-fstack-protector)) 689 stackp-name := AUTO 690else 691ifdef CONFIG_CC_STACKPROTECTOR_REGULAR 692 stackp-flag := -fstack-protector 693 stackp-name := REGULAR 694else 695ifdef CONFIG_CC_STACKPROTECTOR_STRONG 696 stackp-flag := -fstack-protector-strong 697 stackp-name := STRONG 698else 699 # If either there is no stack protector for this architecture or 700 # CONFIG_CC_STACKPROTECTOR_NONE is selected, we're done, and $(stackp-name) 701 # is empty, skipping all remaining stack protector tests. 702 # 703 # Force off for distro compilers that enable stack protector by default. 704 KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector) 705endif 706endif 707endif 708# Find arch-specific stack protector compiler sanity-checking script. 709ifdef stackp-name 710ifneq ($(stackp-flag),) 711 stackp-path := $(srctree)/scripts/gcc-$(SRCARCH)_$(BITS)-has-stack-protector.sh 712 stackp-check := $(wildcard $(stackp-path)) 713 # If the wildcard test matches a test script, run it to check functionality. 714 ifdef stackp-check 715 ifneq ($(shell $(CONFIG_SHELL) $(stackp-check) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y) 716 stackp-broken := y 717 endif 718 endif 719 ifndef stackp-broken 720 # If the stack protector is functional, enable code that depends on it. 721 KBUILD_CPPFLAGS += -DCONFIG_CC_STACKPROTECTOR 722 # Either we've already detected the flag (for AUTO) or we'll fail the 723 # build in the prepare-compiler-check rule (for specific flag). 724 KBUILD_CFLAGS += $(stackp-flag) 725 else 726 # We have to make sure stack protector is unconditionally disabled if 727 # the compiler is broken (in case we're going to continue the build in 728 # AUTO mode). 729 KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector) 730 endif 731endif 732endif 733 734ifeq ($(cc-name),clang) 735KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,) 736KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier) 737KBUILD_CFLAGS += $(call cc-disable-warning, gnu) 738KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) 739# Quiet clang warning: comparison of unsigned expression < 0 is always false 740KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare) 741# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the 742# source of a reference will be _MergedGlobals and not on of the whitelisted names. 743# See modpost pattern 2 744KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,) 745KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior) 746KBUILD_CFLAGS += $(call cc-option, -no-integrated-as) 747KBUILD_AFLAGS += $(call cc-option, -no-integrated-as) 748else 749 750# These warnings generated too much noise in a regular build. 751# Use make W=1 to enable them (see scripts/Makefile.extrawarn) 752KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable) 753endif 754 755KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) 756ifdef CONFIG_FRAME_POINTER 757KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 758else 759# Some targets (ARM with Thumb2, for example), can't be built with frame 760# pointers. For those, we don't have FUNCTION_TRACER automatically 761# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 762# incompatible with -fomit-frame-pointer with current GCC, so we don't use 763# -fomit-frame-pointer with FUNCTION_TRACER. 764ifndef CONFIG_FUNCTION_TRACER 765KBUILD_CFLAGS += -fomit-frame-pointer 766endif 767endif 768 769KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments) 770 771ifdef CONFIG_DEBUG_INFO 772ifdef CONFIG_DEBUG_INFO_SPLIT 773KBUILD_CFLAGS += $(call cc-option, -gsplit-dwarf, -g) 774else 775KBUILD_CFLAGS += -g 776endif 777KBUILD_AFLAGS += -Wa,-gdwarf-2 778endif 779ifdef CONFIG_DEBUG_INFO_DWARF4 780KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,) 781endif 782 783ifdef CONFIG_DEBUG_INFO_REDUCED 784KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \ 785 $(call cc-option,-fno-var-tracking) 786endif 787 788ifdef CONFIG_FUNCTION_TRACER 789ifndef CC_FLAGS_FTRACE 790CC_FLAGS_FTRACE := -pg 791endif 792export CC_FLAGS_FTRACE 793ifdef CONFIG_HAVE_FENTRY 794CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY) 795endif 796KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY) 797KBUILD_AFLAGS += $(CC_USING_FENTRY) 798ifdef CONFIG_DYNAMIC_FTRACE 799 ifdef CONFIG_HAVE_C_RECORDMCOUNT 800 BUILD_C_RECORDMCOUNT := y 801 export BUILD_C_RECORDMCOUNT 802 endif 803endif 804endif 805 806# We trigger additional mismatches with less inlining 807ifdef CONFIG_DEBUG_SECTION_MISMATCH 808KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) 809endif 810 811ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 812KBUILD_CFLAGS += $(call cc-option,-ffunction-sections,) 813KBUILD_CFLAGS += $(call cc-option,-fdata-sections,) 814endif 815 816# arch Makefile may override CC so keep this after arch Makefile is included 817NOSTDINC_FLAGS += -nostdinc -isystem $(call shell-cached,$(CC) -print-file-name=include) 818CHECKFLAGS += $(NOSTDINC_FLAGS) 819 820# warn about C99 declaration after statement 821KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,) 822 823# disable pointer signed / unsigned warnings in gcc 4.0 824KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign) 825 826# disable invalid "can't wrap" optimizations for signed / pointers 827KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow) 828 829# Make sure -fstack-check isn't enabled (like gentoo apparently did) 830KBUILD_CFLAGS += $(call cc-option,-fno-stack-check,) 831 832# conserve stack if available 833KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) 834 835# disallow errors like 'EXPORT_GPL(foo);' with missing header 836KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int) 837 838# require functions to have arguments in prototypes, not empty 'int foo()' 839KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes) 840 841# Prohibit date/time macros, which would make the build non-deterministic 842KBUILD_CFLAGS += $(call cc-option,-Werror=date-time) 843 844# enforce correct pointer usage 845KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 846 847# Require designated initializers for all marked structures 848KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) 849 850# use the deterministic mode of AR if available 851KBUILD_ARFLAGS := $(call ar-option,D) 852 853include scripts/Makefile.kasan 854include scripts/Makefile.extrawarn 855include scripts/Makefile.ubsan 856 857# Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the 858# last assignments 859KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS) 860KBUILD_AFLAGS += $(ARCH_AFLAGS) $(KAFLAGS) 861KBUILD_CFLAGS += $(ARCH_CFLAGS) $(KCFLAGS) 862 863# Use --build-id when available. 864LDFLAGS_BUILD_ID := $(call ld-option, --build-id) 865KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID) 866LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID) 867 868ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 869LDFLAGS_vmlinux += $(call ld-option, --gc-sections,) 870endif 871 872ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 873LDFLAGS_vmlinux += $(call ld-option, -X,) 874endif 875 876# Default kernel image to build when no specific target is given. 877# KBUILD_IMAGE may be overruled on the command line or 878# set in the environment 879# Also any assignments in arch/$(ARCH)/Makefile take precedence over 880# this default value 881export KBUILD_IMAGE ?= vmlinux 882 883# 884# INSTALL_PATH specifies where to place the updated kernel and system map 885# images. Default is /boot, but you can set it to other values 886export INSTALL_PATH ?= /boot 887 888# 889# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 890# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 891# an argument if needed. Otherwise it defaults to the kernel install path 892# 893export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 894 895# 896# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 897# relocations required by build roots. This is not defined in the 898# makefile but the argument can be passed to make if needed. 899# 900 901MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 902export MODLIB 903 904# 905# INSTALL_MOD_STRIP, if defined, will cause modules to be 906# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then 907# the default option --strip-debug will be used. Otherwise, 908# INSTALL_MOD_STRIP value will be used as the options to the strip command. 909 910ifdef INSTALL_MOD_STRIP 911ifeq ($(INSTALL_MOD_STRIP),1) 912mod_strip_cmd = $(STRIP) --strip-debug 913else 914mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP) 915endif # INSTALL_MOD_STRIP=1 916else 917mod_strip_cmd = true 918endif # INSTALL_MOD_STRIP 919export mod_strip_cmd 920 921# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed 922# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP 923# or CONFIG_MODULE_COMPRESS_XZ. 924 925mod_compress_cmd = true 926ifdef CONFIG_MODULE_COMPRESS 927 ifdef CONFIG_MODULE_COMPRESS_GZIP 928 mod_compress_cmd = gzip -n -f 929 endif # CONFIG_MODULE_COMPRESS_GZIP 930 ifdef CONFIG_MODULE_COMPRESS_XZ 931 mod_compress_cmd = xz -f 932 endif # CONFIG_MODULE_COMPRESS_XZ 933endif # CONFIG_MODULE_COMPRESS 934export mod_compress_cmd 935 936# Select initial ramdisk compression format, default is gzip(1). 937# This shall be used by the dracut(8) tool while creating an initramfs image. 938# 939INITRD_COMPRESS-y := gzip 940INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2 941INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma 942INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz 943INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo 944INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4 945# do not export INITRD_COMPRESS, since we didn't actually 946# choose a sane default compression above. 947# export INITRD_COMPRESS := $(INITRD_COMPRESS-y) 948 949ifdef CONFIG_MODULE_SIG_ALL 950$(eval $(call config_filename,MODULE_SIG_KEY)) 951 952mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509 953else 954mod_sign_cmd = true 955endif 956export mod_sign_cmd 957 958ifdef CONFIG_STACK_VALIDATION 959 has_libelf := $(call try-run,\ 960 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0) 961 ifeq ($(has_libelf),1) 962 objtool_target := tools/objtool FORCE 963 else 964 ifdef CONFIG_UNWINDER_ORC 965 $(error "Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel") 966 else 967 $(warning "Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel") 968 endif 969 SKIP_STACK_VALIDATION := 1 970 export SKIP_STACK_VALIDATION 971 endif 972endif 973 974 975ifeq ($(KBUILD_EXTMOD),) 976core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/ 977 978vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \ 979 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 980 $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y))) 981 982vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \ 983 $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-)))) 984 985init-y := $(patsubst %/, %/built-in.o, $(init-y)) 986core-y := $(patsubst %/, %/built-in.o, $(core-y)) 987drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y)) 988net-y := $(patsubst %/, %/built-in.o, $(net-y)) 989libs-y1 := $(patsubst %/, %/lib.a, $(libs-y)) 990libs-y2 := $(filter-out %.a, $(patsubst %/, %/built-in.o, $(libs-y))) 991virt-y := $(patsubst %/, %/built-in.o, $(virt-y)) 992 993# Externally visible symbols (used by link-vmlinux.sh) 994export KBUILD_VMLINUX_INIT := $(head-y) $(init-y) 995export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y2) $(drivers-y) $(net-y) $(virt-y) 996export KBUILD_VMLINUX_LIBS := $(libs-y1) 997export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 998export LDFLAGS_vmlinux 999# used by scripts/package/Makefile 1000export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools) 1001 1002vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) $(KBUILD_VMLINUX_LIBS) 1003 1004# Include targets which we want to execute sequentially if the rest of the 1005# kernel build went well. If CONFIG_TRIM_UNUSED_KSYMS is set, this might be 1006# evaluated more than once. 1007PHONY += vmlinux_prereq 1008vmlinux_prereq: $(vmlinux-deps) FORCE 1009ifdef CONFIG_HEADERS_CHECK 1010 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check 1011endif 1012ifdef CONFIG_GDB_SCRIPTS 1013 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1014endif 1015ifdef CONFIG_TRIM_UNUSED_KSYMS 1016 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ 1017 "$(MAKE) -f $(srctree)/Makefile vmlinux" 1018endif 1019 1020# standalone target for easier testing 1021include/generated/autoksyms.h: FORCE 1022 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh true 1023 1024ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink) 1025 1026# Final link of vmlinux with optional arch pass after final link 1027cmd_link-vmlinux = \ 1028 $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) ; \ 1029 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) 1030 1031vmlinux: scripts/link-vmlinux.sh vmlinux_prereq $(vmlinux-deps) FORCE 1032 +$(call if_changed,link-vmlinux) 1033 1034# Build samples along the rest of the kernel 1035ifdef CONFIG_SAMPLES 1036vmlinux-dirs += samples 1037endif 1038 1039# The actual objects are generated when descending, 1040# make sure no implicit rule kicks in 1041$(sort $(vmlinux-deps)): $(vmlinux-dirs) ; 1042 1043# Handle descending into subdirectories listed in $(vmlinux-dirs) 1044# Preset locale variables to speed up the build process. Limit locale 1045# tweaks to this spot to avoid wrong language settings when running 1046# make menuconfig etc. 1047# Error messages still appears in the original language 1048 1049PHONY += $(vmlinux-dirs) 1050$(vmlinux-dirs): prepare scripts 1051 $(Q)$(MAKE) $(build)=$@ need-builtin=1 1052 1053define filechk_kernel.release 1054 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1055endef 1056 1057# Store (new) KERNELRELEASE string in include/config/kernel.release 1058include/config/kernel.release: include/config/auto.conf FORCE 1059 $(call filechk,kernel.release) 1060 1061 1062# Things we need to do before we recursively start building the kernel 1063# or the modules are listed in "prepare". 1064# A multi level approach is used. prepareN is processed before prepareN-1. 1065# archprepare is used in arch Makefiles and when processed asm symlink, 1066# version.h and scripts_basic is processed / created. 1067 1068# Listed in dependency order 1069PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3 1070 1071# prepare3 is used to check if we are building in a separate output directory, 1072# and if so do: 1073# 1) Check that make has not been executed in the kernel src $(srctree) 1074prepare3: include/config/kernel.release 1075ifneq ($(KBUILD_SRC),) 1076 @$(kecho) ' Using $(srctree) as source for kernel' 1077 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \ 1078 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \ 1079 echo >&2 " in the '$(srctree)' directory.";\ 1080 /bin/false; \ 1081 fi; 1082endif 1083 1084# prepare2 creates a makefile if using a separate output directory. 1085# From this point forward, .config has been reprocessed, so any rules 1086# that need to depend on updated CONFIG_* values can be checked here. 1087prepare2: prepare3 prepare-compiler-check outputmakefile asm-generic 1088 1089prepare1: prepare2 $(version_h) include/generated/utsrelease.h \ 1090 include/config/auto.conf 1091 $(cmd_crmodverdir) 1092 1093archprepare: archheaders archscripts prepare1 scripts_basic 1094 1095prepare0: archprepare gcc-plugins 1096 $(Q)$(MAKE) $(build)=. 1097 1098# All the preparing.. 1099prepare: prepare0 prepare-objtool 1100 1101# Support for using generic headers in asm-generic 1102PHONY += asm-generic uapi-asm-generic 1103asm-generic: uapi-asm-generic 1104 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \ 1105 src=asm obj=arch/$(SRCARCH)/include/generated/asm 1106uapi-asm-generic: 1107 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \ 1108 src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm 1109 1110PHONY += prepare-objtool 1111prepare-objtool: $(objtool_target) 1112 1113# Check for CONFIG flags that require compiler support. Abort the build 1114# after .config has been processed, but before the kernel build starts. 1115# 1116# For security-sensitive CONFIG options, we don't want to fallback and/or 1117# silently change which compiler flags will be used, since that leads to 1118# producing kernels with different security feature characteristics 1119# depending on the compiler used. (For example, "But I selected 1120# CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!") 1121PHONY += prepare-compiler-check 1122prepare-compiler-check: FORCE 1123# Make sure compiler supports requested stack protector flag. 1124ifdef stackp-name 1125 # Warn about CONFIG_CC_STACKPROTECTOR_AUTO having found no option. 1126 ifeq ($(stackp-flag),) 1127 @echo CONFIG_CC_STACKPROTECTOR_$(stackp-name): \ 1128 Compiler does not support any known stack-protector >&2 1129 else 1130 # Fail if specifically requested stack protector is missing. 1131 ifeq ($(call cc-option, $(stackp-flag)),) 1132 @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \ 1133 $(stackp-flag) not supported by compiler >&2 && exit 1 1134 endif 1135 endif 1136endif 1137# Make sure compiler does not have buggy stack-protector support. If a 1138# specific stack-protector was requested, fail the build, otherwise warn. 1139ifdef stackp-broken 1140 ifeq ($(stackp-name),AUTO) 1141 @echo CONFIG_CC_STACKPROTECTOR_$(stackp-name): \ 1142 $(stackp-flag) available but compiler is broken: disabling >&2 1143 else 1144 @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \ 1145 $(stackp-flag) available but compiler is broken >&2 && exit 1 1146 endif 1147endif 1148 @: 1149 1150# Generate some files 1151# --------------------------------------------------------------------------- 1152 1153# KERNELRELEASE can change from a few different places, meaning version.h 1154# needs to be updated, so this check is forced on all builds 1155 1156uts_len := 64 1157define filechk_utsrelease.h 1158 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1159 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1160 exit 1; \ 1161 fi; \ 1162 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";) 1163endef 1164 1165define filechk_version.h 1166 (echo \#define LINUX_VERSION_CODE $(shell \ 1167 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \ 1168 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';) 1169endef 1170 1171$(version_h): $(srctree)/Makefile FORCE 1172 $(call filechk,version.h) 1173 $(Q)rm -f $(old_version_h) 1174 1175include/generated/utsrelease.h: include/config/kernel.release FORCE 1176 $(call filechk,utsrelease.h) 1177 1178PHONY += headerdep 1179headerdep: 1180 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1181 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1182 1183# --------------------------------------------------------------------------- 1184# Kernel headers 1185 1186#Default location for installed headers 1187export INSTALL_HDR_PATH = $(objtree)/usr 1188 1189# If we do an all arch process set dst to include/arch-$(SRCARCH) 1190hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(SRCARCH), dst=include) 1191 1192PHONY += archheaders 1193archheaders: 1194 1195PHONY += archscripts 1196archscripts: 1197 1198PHONY += __headers 1199__headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts 1200 $(Q)$(MAKE) $(build)=scripts build_unifdef 1201 1202PHONY += headers_install_all 1203headers_install_all: 1204 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install 1205 1206PHONY += headers_install 1207headers_install: __headers 1208 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \ 1209 $(error Headers not exportable for the $(SRCARCH) architecture)) 1210 $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include 1211 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) 1212 1213PHONY += headers_check_all 1214headers_check_all: headers_install_all 1215 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check 1216 1217PHONY += headers_check 1218headers_check: headers_install 1219 $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1 1220 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) HDRCHECK=1 1221 1222# --------------------------------------------------------------------------- 1223# Kernel selftest 1224 1225PHONY += kselftest 1226kselftest: 1227 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1228 1229PHONY += kselftest-clean 1230kselftest-clean: 1231 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean 1232 1233PHONY += kselftest-merge 1234kselftest-merge: 1235 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1236 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \ 1237 -m $(objtree)/.config \ 1238 $(srctree)/tools/testing/selftests/*/config 1239 +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1240 1241# --------------------------------------------------------------------------- 1242# Modules 1243 1244ifdef CONFIG_MODULES 1245 1246# By default, build modules as well 1247 1248all: modules 1249 1250# Build modules 1251# 1252# A module can be listed more than once in obj-m resulting in 1253# duplicate lines in modules.order files. Those are removed 1254# using awk while concatenating to the final file. 1255 1256PHONY += modules 1257modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin 1258 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order 1259 @$(kecho) ' Building modules, stage 2.'; 1260 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1261 1262modules.builtin: $(vmlinux-dirs:%=%/modules.builtin) 1263 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin 1264 1265%/modules.builtin: include/config/auto.conf 1266 $(Q)$(MAKE) $(modbuiltin)=$* 1267 1268 1269# Target to prepare building external modules 1270PHONY += modules_prepare 1271modules_prepare: prepare scripts 1272 1273# Target to install modules 1274PHONY += modules_install 1275modules_install: _modinst_ _modinst_post 1276 1277PHONY += _modinst_ 1278_modinst_: 1279 @rm -rf $(MODLIB)/kernel 1280 @rm -f $(MODLIB)/source 1281 @mkdir -p $(MODLIB)/kernel 1282 @ln -s $(abspath $(srctree)) $(MODLIB)/source 1283 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1284 rm -f $(MODLIB)/build ; \ 1285 ln -s $(CURDIR) $(MODLIB)/build ; \ 1286 fi 1287 @cp -f $(objtree)/modules.order $(MODLIB)/ 1288 @cp -f $(objtree)/modules.builtin $(MODLIB)/ 1289 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1290 1291# This depmod is only for convenience to give the initial 1292# boot a modules.dep even before / is mounted read-write. However the 1293# boot script depmod is the master version. 1294PHONY += _modinst_post 1295_modinst_post: _modinst_ 1296 $(call cmd,depmod) 1297 1298ifeq ($(CONFIG_MODULE_SIG), y) 1299PHONY += modules_sign 1300modules_sign: 1301 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign 1302endif 1303 1304else # CONFIG_MODULES 1305 1306# Modules not configured 1307# --------------------------------------------------------------------------- 1308 1309PHONY += modules modules_install 1310modules modules_install: 1311 @echo >&2 1312 @echo >&2 "The present kernel configuration has modules disabled." 1313 @echo >&2 "Type 'make config' and enable loadable module support." 1314 @echo >&2 "Then build a kernel with module support enabled." 1315 @echo >&2 1316 @exit 1 1317 1318endif # CONFIG_MODULES 1319 1320### 1321# Cleaning is done on three levels. 1322# make clean Delete most generated files 1323# Leave enough to build external modules 1324# make mrproper Delete the current configuration, and all generated files 1325# make distclean Remove editor backup files, patch leftover files and the like 1326 1327# Directories & files removed with 'make clean' 1328CLEAN_DIRS += $(MODVERDIR) 1329 1330# Directories & files removed with 'make mrproper' 1331MRPROPER_DIRS += include/config usr/include include/generated \ 1332 arch/*/include/generated .tmp_objdiff 1333MRPROPER_FILES += .config .config.old .version \ 1334 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \ 1335 signing_key.pem signing_key.priv signing_key.x509 \ 1336 x509.genkey extra_certificates signing_key.x509.keyid \ 1337 signing_key.x509.signer vmlinux-gdb.py 1338 1339# clean - Delete most, but leave enough to build external modules 1340# 1341clean: rm-dirs := $(CLEAN_DIRS) 1342clean: rm-files := $(CLEAN_FILES) 1343clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples) 1344 1345PHONY += $(clean-dirs) clean archclean vmlinuxclean 1346$(clean-dirs): 1347 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1348 1349vmlinuxclean: 1350 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1351 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1352 1353clean: archclean vmlinuxclean 1354 1355# mrproper - Delete all generated files, including .config 1356# 1357mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS)) 1358mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1359mrproper-dirs := $(addprefix _mrproper_,scripts) 1360 1361PHONY += $(mrproper-dirs) mrproper archmrproper 1362$(mrproper-dirs): 1363 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1364 1365mrproper: clean archmrproper $(mrproper-dirs) 1366 $(call cmd,rmdirs) 1367 $(call cmd,rmfiles) 1368 1369# distclean 1370# 1371PHONY += distclean 1372 1373distclean: mrproper 1374 @find $(srctree) $(RCS_FIND_IGNORE) \ 1375 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1376 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1377 -o -name 'core' \) \ 1378 -type f -print | xargs rm -f 1379 1380 1381# Packaging of the kernel to various formats 1382# --------------------------------------------------------------------------- 1383# rpm target kept for backward compatibility 1384package-dir := scripts/package 1385 1386%src-pkg: FORCE 1387 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1388%pkg: include/config/kernel.release FORCE 1389 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1390rpm: rpm-pkg 1391 @echo " WARNING: \"rpm\" target will be removed after Linux 4.18" 1392 @echo " Please use \"rpm-pkg\" instead." 1393 1394 1395# Brief documentation of the typical targets used 1396# --------------------------------------------------------------------------- 1397 1398boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1399boards := $(sort $(notdir $(boards))) 1400board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1401board-dirs := $(sort $(notdir $(board-dirs:/=))) 1402 1403PHONY += help 1404help: 1405 @echo 'Cleaning targets:' 1406 @echo ' clean - Remove most generated files but keep the config and' 1407 @echo ' enough build support to build external modules' 1408 @echo ' mrproper - Remove all generated files + config + various backup files' 1409 @echo ' distclean - mrproper + remove editor backup and patch files' 1410 @echo '' 1411 @echo 'Configuration targets:' 1412 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1413 @echo '' 1414 @echo 'Other generic targets:' 1415 @echo ' all - Build all targets marked with [*]' 1416 @echo '* vmlinux - Build the bare kernel' 1417 @echo '* modules - Build all modules' 1418 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1419 @echo ' dir/ - Build all files in dir and below' 1420 @echo ' dir/file.[ois] - Build specified target only' 1421 @echo ' dir/file.ll - Build the LLVM assembly file' 1422 @echo ' (requires compiler support for LLVM assembly generation)' 1423 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1424 @echo ' (requires a recent binutils and recent build (System.map))' 1425 @echo ' dir/file.ko - Build module including final link' 1426 @echo ' modules_prepare - Set up for building external modules' 1427 @echo ' tags/TAGS - Generate tags file for editors' 1428 @echo ' cscope - Generate cscope index' 1429 @echo ' gtags - Generate GNU GLOBAL index' 1430 @echo ' kernelrelease - Output the release version string (use with make -s)' 1431 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1432 @echo ' image_name - Output the image name (use with make -s)' 1433 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1434 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1435 echo '' 1436 @echo 'Static analysers:' 1437 @echo ' checkstack - Generate a list of stack hogs' 1438 @echo ' namespacecheck - Name space analysis on compiled kernel' 1439 @echo ' versioncheck - Sanity check on version.h usage' 1440 @echo ' includecheck - Check for duplicate included header files' 1441 @echo ' export_report - List the usages of all exported symbols' 1442 @echo ' headers_check - Sanity check on exported headers' 1443 @echo ' headerdep - Detect inclusion cycles in headers' 1444 @echo ' coccicheck - Check with Coccinelle' 1445 @echo '' 1446 @echo 'Kernel selftest:' 1447 @echo ' kselftest - Build and run kernel selftest (run as root)' 1448 @echo ' Build, install, and boot kernel before' 1449 @echo ' running kselftest on it' 1450 @echo ' kselftest-clean - Remove all generated kselftest files' 1451 @echo ' kselftest-merge - Merge all the config dependencies of kselftest to existing' 1452 @echo ' .config.' 1453 @echo '' 1454 @echo 'Userspace tools targets:' 1455 @echo ' use "make tools/help"' 1456 @echo ' or "cd tools; make help"' 1457 @echo '' 1458 @echo 'Kernel packaging:' 1459 @$(MAKE) $(build)=$(package-dir) help 1460 @echo '' 1461 @echo 'Documentation targets:' 1462 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1463 @echo '' 1464 @echo 'Architecture specific targets ($(SRCARCH)):' 1465 @$(if $(archhelp),$(archhelp),\ 1466 echo ' No architecture specific help defined for $(SRCARCH)') 1467 @echo '' 1468 @$(if $(boards), \ 1469 $(foreach b, $(boards), \ 1470 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1471 echo '') 1472 @$(if $(board-dirs), \ 1473 $(foreach b, $(board-dirs), \ 1474 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1475 printf " %-16s - Show all of the above\\n" help-boards; \ 1476 echo '') 1477 1478 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1479 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1480 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1481 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK (sparse by default)' 1482 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1483 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1484 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where' 1485 @echo ' 1: warnings which may be relevant and do not occur too often' 1486 @echo ' 2: warnings which occur quite often but may still be relevant' 1487 @echo ' 3: more obscure warnings, can most likely be ignored' 1488 @echo ' Multiple levels can be combined with W=12 or W=123' 1489 @echo '' 1490 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1491 @echo 'For further info see the ./README file' 1492 1493 1494help-board-dirs := $(addprefix help-,$(board-dirs)) 1495 1496help-boards: $(help-board-dirs) 1497 1498boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1499 1500$(help-board-dirs): help-%: 1501 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1502 @$(if $(boards-per-dir), \ 1503 $(foreach b, $(boards-per-dir), \ 1504 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1505 echo '') 1506 1507 1508# Documentation targets 1509# --------------------------------------------------------------------------- 1510DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1511 linkcheckdocs dochelp refcheckdocs 1512PHONY += $(DOC_TARGETS) 1513$(DOC_TARGETS): scripts_basic FORCE 1514 $(Q)$(MAKE) $(build)=Documentation $@ 1515 1516else # KBUILD_EXTMOD 1517 1518### 1519# External module support. 1520# When building external modules the kernel used as basis is considered 1521# read-only, and no consistency checks are made and the make 1522# system is not used on the basis kernel. If updates are required 1523# in the basis kernel ordinary make commands (without M=...) must 1524# be used. 1525# 1526# The following are the only valid targets when building external 1527# modules. 1528# make M=dir clean Delete all automatically generated files 1529# make M=dir modules Make all modules in specified dir 1530# make M=dir Same as 'make M=dir modules' 1531# make M=dir modules_install 1532# Install the modules built in the module directory 1533# Assumes install directory is already created 1534 1535# We are always building modules 1536KBUILD_MODULES := 1 1537PHONY += crmodverdir 1538crmodverdir: 1539 $(cmd_crmodverdir) 1540 1541PHONY += $(objtree)/Module.symvers 1542$(objtree)/Module.symvers: 1543 @test -e $(objtree)/Module.symvers || ( \ 1544 echo; \ 1545 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \ 1546 echo " is missing; modules will have no dependencies and modversions."; \ 1547 echo ) 1548 1549module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD)) 1550PHONY += $(module-dirs) modules 1551$(module-dirs): crmodverdir $(objtree)/Module.symvers 1552 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@) 1553 1554modules: $(module-dirs) 1555 @$(kecho) ' Building modules, stage 2.'; 1556 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1557 1558PHONY += modules_install 1559modules_install: _emodinst_ _emodinst_post 1560 1561install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra) 1562PHONY += _emodinst_ 1563_emodinst_: 1564 $(Q)mkdir -p $(MODLIB)/$(install-dir) 1565 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1566 1567PHONY += _emodinst_post 1568_emodinst_post: _emodinst_ 1569 $(call cmd,depmod) 1570 1571clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD)) 1572 1573PHONY += $(clean-dirs) clean 1574$(clean-dirs): 1575 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1576 1577clean: rm-dirs := $(MODVERDIR) 1578clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers 1579 1580PHONY += help 1581help: 1582 @echo ' Building external modules.' 1583 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1584 @echo '' 1585 @echo ' modules - default target, build the module(s)' 1586 @echo ' modules_install - install the module' 1587 @echo ' clean - remove generated files in module directory only' 1588 @echo '' 1589 1590# Dummies... 1591PHONY += prepare scripts 1592prepare: ; 1593scripts: ; 1594endif # KBUILD_EXTMOD 1595 1596clean: $(clean-dirs) 1597 $(call cmd,rmdirs) 1598 $(call cmd,rmfiles) 1599 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1600 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \ 1601 -o -name '*.ko.*' -o -name '*.dtb' -o -name '*.dtb.S' \ 1602 -o -name '*.dwo' -o -name '*.lst' \ 1603 -o -name '*.su' \ 1604 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1605 -o -name '*.symtypes' -o -name 'modules.order' \ 1606 -o -name modules.builtin -o -name '.tmp_*.o.*' \ 1607 -o -name .cache.mk \ 1608 -o -name '*.c.[012]*.*' \ 1609 -o -name '*.ll' \ 1610 -o -name '*.gcno' \) -type f -print | xargs rm -f 1611 1612# Generate tags for editors 1613# --------------------------------------------------------------------------- 1614quiet_cmd_tags = GEN $@ 1615 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@ 1616 1617tags TAGS cscope gtags: FORCE 1618 $(call cmd,tags) 1619 1620# Scripts to check various things for consistency 1621# --------------------------------------------------------------------------- 1622 1623PHONY += includecheck versioncheck coccicheck namespacecheck export_report 1624 1625includecheck: 1626 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1627 -name '*.[hcS]' -type f -print | sort \ 1628 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1629 1630versioncheck: 1631 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1632 -name '*.[hcS]' -type f -print | sort \ 1633 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1634 1635coccicheck: 1636 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@ 1637 1638namespacecheck: 1639 $(PERL) $(srctree)/scripts/namespace.pl 1640 1641export_report: 1642 $(PERL) $(srctree)/scripts/export_report.pl 1643 1644endif #ifeq ($(config-targets),1) 1645endif #ifeq ($(mixed-targets),1) 1646 1647PHONY += checkstack kernelrelease kernelversion image_name 1648 1649# UML needs a little special treatment here. It wants to use the host 1650# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1651# else wants $(ARCH), including people doing cross-builds, which means 1652# that $(SUBARCH) doesn't work here. 1653ifeq ($(ARCH), um) 1654CHECKSTACK_ARCH := $(SUBARCH) 1655else 1656CHECKSTACK_ARCH := $(ARCH) 1657endif 1658checkstack: 1659 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1660 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1661 1662kernelrelease: 1663 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1664 1665kernelversion: 1666 @echo $(KERNELVERSION) 1667 1668image_name: 1669 @echo $(KBUILD_IMAGE) 1670 1671# Clear a bunch of variables before executing the submake 1672tools/: FORCE 1673 $(Q)mkdir -p $(objtree)/tools 1674 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ 1675 1676tools/%: FORCE 1677 $(Q)mkdir -p $(objtree)/tools 1678 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $* 1679 1680# Single targets 1681# --------------------------------------------------------------------------- 1682# Single targets are compatible with: 1683# - build with mixed source and output 1684# - build with separate output dir 'make O=...' 1685# - external modules 1686# 1687# target-dir => where to store outputfile 1688# build-dir => directory in kernel source tree to use 1689 1690ifeq ($(KBUILD_EXTMOD),) 1691 build-dir = $(patsubst %/,%,$(dir $@)) 1692 target-dir = $(dir $@) 1693else 1694 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@))) 1695 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash)) 1696 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@)) 1697endif 1698 1699%.s: %.c prepare scripts FORCE 1700 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1701%.i: %.c prepare scripts FORCE 1702 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1703%.o: %.c prepare scripts FORCE 1704 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1705%.lst: %.c prepare scripts FORCE 1706 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1707%.s: %.S prepare scripts FORCE 1708 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1709%.o: %.S prepare scripts FORCE 1710 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1711%.symtypes: %.c prepare scripts FORCE 1712 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1713%.ll: %.c prepare scripts FORCE 1714 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1715 1716# Modules 1717/: prepare scripts FORCE 1718 $(cmd_crmodverdir) 1719 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1720 $(build)=$(build-dir) 1721# Make sure the latest headers are built for Documentation 1722Documentation/ samples/: headers_install 1723%/: prepare scripts FORCE 1724 $(cmd_crmodverdir) 1725 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1726 $(build)=$(build-dir) 1727%.ko: prepare scripts FORCE 1728 $(cmd_crmodverdir) 1729 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1730 $(build)=$(build-dir) $(@:.ko=.o) 1731 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1732 1733# FIXME Should go into a make.lib or something 1734# =========================================================================== 1735 1736quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs))) 1737 cmd_rmdirs = rm -rf $(rm-dirs) 1738 1739quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1740 cmd_rmfiles = rm -f $(rm-files) 1741 1742# Run depmod only if we have System.map and depmod is executable 1743quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) 1744 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1745 $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))" 1746 1747# Create temporary dir for module support files 1748# clean it up only when building all modules 1749cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \ 1750 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*) 1751 1752# read all saved command lines 1753 1754cmd_files := $(wildcard .*.cmd $(foreach f,$(sort $(targets)),$(dir $(f)).$(notdir $(f)).cmd)) 1755 1756ifneq ($(cmd_files),) 1757 $(cmd_files): ; # Do not try to update included dependency files 1758 include $(cmd_files) 1759endif 1760 1761endif # skip-makefile 1762 1763PHONY += FORCE 1764FORCE: 1765 1766# Declare the contents of the .PHONY variable as phony. We keep that 1767# information in a variable so we can use it in if_changed and friends. 1768.PHONY: $(PHONY) 1769