1# SPDX-License-Identifier: GPL-2.0 2VERSION = 4 3PATCHLEVEL = 19 4SUBLEVEL = 0 5EXTRAVERSION = 6NAME = "People's Front" 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.a 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 223clean-targets := %clean mrproper cleandocs 224no-dot-config-targets := $(clean-targets) \ 225 cscope gtags TAGS tags help% %docs check% coccicheck \ 226 $(version_h) headers_% archheaders archscripts \ 227 %asm-generic kernelversion %src-pkg 228no-sync-config-targets := $(no-dot-config-targets) install %install \ 229 kernelrelease 230 231config-targets := 0 232mixed-targets := 0 233dot-config := 1 234may-sync-config := 1 235 236ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 237 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 238 dot-config := 0 239 endif 240endif 241 242ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),) 243 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),) 244 may-sync-config := 0 245 endif 246endif 247 248ifneq ($(KBUILD_EXTMOD),) 249 may-sync-config := 0 250endif 251 252ifeq ($(KBUILD_EXTMOD),) 253 ifneq ($(filter config %config,$(MAKECMDGOALS)),) 254 config-targets := 1 255 ifneq ($(words $(MAKECMDGOALS)),1) 256 mixed-targets := 1 257 endif 258 endif 259endif 260 261# For "make -j clean all", "make -j mrproper defconfig all", etc. 262ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),) 263 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) 264 mixed-targets := 1 265 endif 266endif 267 268# install and modules_install need also be processed one by one 269ifneq ($(filter install,$(MAKECMDGOALS)),) 270 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 271 mixed-targets := 1 272 endif 273endif 274 275ifeq ($(mixed-targets),1) 276# =========================================================================== 277# We're called with mixed targets (*config and build targets). 278# Handle them one by one. 279 280PHONY += $(MAKECMDGOALS) __build_one_by_one 281 282$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one 283 @: 284 285__build_one_by_one: 286 $(Q)set -e; \ 287 for i in $(MAKECMDGOALS); do \ 288 $(MAKE) -f $(srctree)/Makefile $$i; \ 289 done 290 291else 292 293# We need some generic definitions (do not try to remake the file). 294scripts/Kbuild.include: ; 295include scripts/Kbuild.include 296 297# Read KERNELRELEASE from include/config/kernel.release (if it exists) 298KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null) 299KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 300export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 301 302include scripts/subarch.include 303 304# Cross compiling and selecting different set of gcc/bin-utils 305# --------------------------------------------------------------------------- 306# 307# When performing cross compilation for other architectures ARCH shall be set 308# to the target architecture. (See arch/* for the possibilities). 309# ARCH can be set during invocation of make: 310# make ARCH=ia64 311# Another way is to have ARCH set in the environment. 312# The default ARCH is the host where make is executed. 313 314# CROSS_COMPILE specify the prefix used for all executables used 315# during compilation. Only gcc and related bin-utils executables 316# are prefixed with $(CROSS_COMPILE). 317# CROSS_COMPILE can be set on the command line 318# make CROSS_COMPILE=ia64-linux- 319# Alternatively CROSS_COMPILE can be set in the environment. 320# Default value for CROSS_COMPILE is not to prefix executables 321# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 322ARCH ?= $(SUBARCH) 323 324# Architecture as present in compile.h 325UTS_MACHINE := $(ARCH) 326SRCARCH := $(ARCH) 327 328# Additional ARCH settings for x86 329ifeq ($(ARCH),i386) 330 SRCARCH := x86 331endif 332ifeq ($(ARCH),x86_64) 333 SRCARCH := x86 334endif 335 336# Additional ARCH settings for sparc 337ifeq ($(ARCH),sparc32) 338 SRCARCH := sparc 339endif 340ifeq ($(ARCH),sparc64) 341 SRCARCH := sparc 342endif 343 344# Additional ARCH settings for sh 345ifeq ($(ARCH),sh64) 346 SRCARCH := sh 347endif 348 349KCONFIG_CONFIG ?= .config 350export KCONFIG_CONFIG 351 352# SHELL used by kbuild 353CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \ 354 else if [ -x /bin/bash ]; then echo /bin/bash; \ 355 else echo sh; fi ; fi) 356 357HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null) 358HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null) 359HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null) 360 361HOSTCC = gcc 362HOSTCXX = g++ 363KBUILD_HOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \ 364 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) \ 365 $(HOSTCFLAGS) 366KBUILD_HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) 367KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 368KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 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 388PYTHON2 = python2 389PYTHON3 = python3 390CHECK = sparse 391 392CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 393 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 394NOSTDINC_FLAGS = 395CFLAGS_MODULE = 396AFLAGS_MODULE = 397LDFLAGS_MODULE = 398CFLAGS_KERNEL = 399AFLAGS_KERNEL = 400LDFLAGS_vmlinux = 401 402# Use USERINCLUDE when you must reference the UAPI directories only. 403USERINCLUDE := \ 404 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 405 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 406 -I$(srctree)/include/uapi \ 407 -I$(objtree)/include/generated/uapi \ 408 -include $(srctree)/include/linux/kconfig.h 409 410# Use LINUXINCLUDE when you must reference the include/ directory. 411# Needed to be compatible with the O= option 412LINUXINCLUDE := \ 413 -I$(srctree)/arch/$(SRCARCH)/include \ 414 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 415 $(if $(KBUILD_SRC), -I$(srctree)/include) \ 416 -I$(objtree)/include \ 417 $(USERINCLUDE) 418 419KBUILD_AFLAGS := -D__ASSEMBLY__ 420KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \ 421 -fno-strict-aliasing -fno-common -fshort-wchar \ 422 -Werror-implicit-function-declaration \ 423 -Wno-format-security \ 424 -std=gnu89 425KBUILD_CPPFLAGS := -D__KERNEL__ 426KBUILD_AFLAGS_KERNEL := 427KBUILD_CFLAGS_KERNEL := 428KBUILD_AFLAGS_MODULE := -DMODULE 429KBUILD_CFLAGS_MODULE := -DMODULE 430KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds 431KBUILD_LDFLAGS := 432GCC_PLUGINS_CFLAGS := 433 434export ARCH SRCARCH CONFIG_SHELL HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE AS LD CC 435export CPP AR NM STRIP OBJCOPY OBJDUMP KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS 436export MAKE LEX YACC AWK GENKSYMS INSTALLKERNEL PERL PYTHON PYTHON2 PYTHON3 UTS_MACHINE 437export HOSTCXX KBUILD_HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS 438 439export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 440export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 441export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN 442export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 443export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 444export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 445export KBUILD_ARFLAGS 446 447# When compiling out-of-tree modules, put MODVERDIR in the module 448# tree rather than in the kernel tree. The kernel tree might 449# even be read-only. 450export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions 451 452# Files to ignore in find ... statements 453 454export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 455 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 456 -prune -o 457export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 458 --exclude CVS --exclude .pc --exclude .hg --exclude .git 459 460# =========================================================================== 461# Rules shared between *config targets and build targets 462 463# Basic helpers built in scripts/basic/ 464PHONY += scripts_basic 465scripts_basic: 466 $(Q)$(MAKE) $(build)=scripts/basic 467 $(Q)rm -f .tmp_quiet_recordmcount 468 469# To avoid any implicit rule to kick in, define an empty command. 470scripts/basic/%: scripts_basic ; 471 472PHONY += outputmakefile 473# outputmakefile generates a Makefile in the output directory, if using a 474# separate output directory. This allows convenient use of make in the 475# output directory. 476outputmakefile: 477ifneq ($(KBUILD_SRC),) 478 $(Q)ln -fsn $(srctree) source 479 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \ 480 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL) 481endif 482 483ifeq ($(cc-name),clang) 484ifneq ($(CROSS_COMPILE),) 485CLANG_TARGET := --target=$(notdir $(CROSS_COMPILE:%-=%)) 486GCC_TOOLCHAIN_DIR := $(dir $(shell which $(LD))) 487CLANG_PREFIX := --prefix=$(GCC_TOOLCHAIN_DIR) 488GCC_TOOLCHAIN := $(realpath $(GCC_TOOLCHAIN_DIR)/..) 489endif 490ifneq ($(GCC_TOOLCHAIN),) 491CLANG_GCC_TC := --gcc-toolchain=$(GCC_TOOLCHAIN) 492endif 493KBUILD_CFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC) $(CLANG_PREFIX) 494KBUILD_AFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC) $(CLANG_PREFIX) 495KBUILD_CFLAGS += $(call cc-option, -no-integrated-as) 496KBUILD_AFLAGS += $(call cc-option, -no-integrated-as) 497endif 498 499RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register 500RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register 501RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk 502RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline 503RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG))) 504RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG))) 505export RETPOLINE_CFLAGS 506export RETPOLINE_VDSO_CFLAGS 507 508KBUILD_CFLAGS += $(call cc-option,-fno-PIE) 509KBUILD_AFLAGS += $(call cc-option,-fno-PIE) 510 511# check for 'asm goto' 512ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y) 513 CC_HAVE_ASM_GOTO := 1 514 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO 515 KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO 516endif 517 518# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 519# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 520# CC_VERSION_TEXT is referenced from Kconfig (so it needs export), 521# and from include/config/auto.conf.cmd to detect the compiler upgrade. 522CC_VERSION_TEXT = $(shell $(CC) --version | head -n 1) 523 524ifeq ($(config-targets),1) 525# =========================================================================== 526# *config targets only - make sure prerequisites are updated, and descend 527# in scripts/kconfig to make the *config target 528 529# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 530# KBUILD_DEFCONFIG may point out an alternative default configuration 531# used for 'make defconfig' 532include arch/$(SRCARCH)/Makefile 533export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT 534 535config: scripts_basic outputmakefile FORCE 536 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 537 538%config: scripts_basic outputmakefile FORCE 539 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 540 541else 542# =========================================================================== 543# Build targets only - this includes vmlinux, arch specific targets, clean 544# targets and others. In general all targets except *config targets. 545 546# If building an external module we do not care about the all: rule 547# but instead _all depend on modules 548PHONY += all 549ifeq ($(KBUILD_EXTMOD),) 550_all: all 551else 552_all: modules 553endif 554 555# Decide whether to build built-in, modular, or both. 556# Normally, just do built-in. 557 558KBUILD_MODULES := 559KBUILD_BUILTIN := 1 560 561# If we have only "make modules", don't compile built-in objects. 562# When we're building modules with modversions, we need to consider 563# the built-in objects during the descend as well, in order to 564# make sure the checksums are up to date before we record them. 565 566ifeq ($(MAKECMDGOALS),modules) 567 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1) 568endif 569 570# If we have "make <whatever> modules", compile modules 571# in addition to whatever we do anyway. 572# Just "make" or "make all" shall build modules as well 573 574ifneq ($(filter all _all modules,$(MAKECMDGOALS)),) 575 KBUILD_MODULES := 1 576endif 577 578ifeq ($(MAKECMDGOALS),) 579 KBUILD_MODULES := 1 580endif 581 582export KBUILD_MODULES KBUILD_BUILTIN 583 584ifeq ($(KBUILD_EXTMOD),) 585# Objects we will link into vmlinux / subdirs we need to visit 586init-y := init/ 587drivers-y := drivers/ sound/ firmware/ 588net-y := net/ 589libs-y := lib/ 590core-y := usr/ 591virt-y := virt/ 592endif # KBUILD_EXTMOD 593 594ifeq ($(dot-config),1) 595include include/config/auto.conf 596endif 597 598# The all: target is the default when no target is given on the 599# command line. 600# This allow a user to issue only 'make' to build a kernel including modules 601# Defaults to vmlinux, but the arch makefile usually adds further targets 602all: vmlinux 603 604CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \ 605 $(call cc-option,-fno-tree-loop-im) \ 606 $(call cc-disable-warning,maybe-uninitialized,) 607export CFLAGS_GCOV 608 609# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 610ifdef CONFIG_FUNCTION_TRACER 611 CC_FLAGS_FTRACE := -pg 612endif 613 614# The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default 615# values of the respective KBUILD_* variables 616ARCH_CPPFLAGS := 617ARCH_AFLAGS := 618ARCH_CFLAGS := 619include arch/$(SRCARCH)/Makefile 620 621ifeq ($(dot-config),1) 622ifeq ($(may-sync-config),1) 623# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 624# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 625# because some architectures define CROSS_COMPILE there. 626-include include/config/auto.conf.cmd 627 628# To avoid any implicit rule to kick in, define an empty command 629$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ; 630 631# The actual configuration files used during the build are stored in 632# include/generated/ and include/config/. Update them if .config is newer than 633# include/config/auto.conf (which mirrors .config). 634include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd 635 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 636else 637# External modules and some install targets need include/generated/autoconf.h 638# and include/config/auto.conf but do not care if they are up-to-date. 639# Use auto.conf to trigger the test 640PHONY += include/config/auto.conf 641 642include/config/auto.conf: 643 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 644 echo >&2; \ 645 echo >&2 " ERROR: Kernel configuration is invalid."; \ 646 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 647 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 648 echo >&2 ; \ 649 /bin/false) 650 651endif # may-sync-config 652endif # $(dot-config) 653 654KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,) 655KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) 656KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) 657KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) 658KBUILD_CFLAGS += $(call cc-disable-warning, int-in-bool-context) 659 660ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 661KBUILD_CFLAGS += $(call cc-option,-Oz,-Os) 662KBUILD_CFLAGS += $(call cc-disable-warning,maybe-uninitialized,) 663else 664ifdef CONFIG_PROFILE_ALL_BRANCHES 665KBUILD_CFLAGS += -O2 $(call cc-disable-warning,maybe-uninitialized,) 666else 667KBUILD_CFLAGS += -O2 668endif 669endif 670 671KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \ 672 $(call cc-disable-warning,maybe-uninitialized,)) 673 674# Tell gcc to never replace conditional load with a non-conditional one 675KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 676 677include scripts/Makefile.kcov 678include scripts/Makefile.gcc-plugins 679 680ifdef CONFIG_READABLE_ASM 681# Disable optimizations that make assembler listings hard to read. 682# reorder blocks reorders the control in the function 683# ipa clone creates specialized cloned functions 684# partial inlining inlines only parts of functions 685KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \ 686 $(call cc-option,-fno-ipa-cp-clone,) \ 687 $(call cc-option,-fno-partial-inlining) 688endif 689 690ifneq ($(CONFIG_FRAME_WARN),0) 691KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN}) 692endif 693 694stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector 695stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 696stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 697 698KBUILD_CFLAGS += $(stackp-flags-y) 699 700ifeq ($(cc-name),clang) 701KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,) 702KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier) 703KBUILD_CFLAGS += $(call cc-disable-warning, gnu) 704KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) 705# Quiet clang warning: comparison of unsigned expression < 0 is always false 706KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare) 707# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the 708# source of a reference will be _MergedGlobals and not on of the whitelisted names. 709# See modpost pattern 2 710KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,) 711KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior) 712else 713 714# These warnings generated too much noise in a regular build. 715# Use make W=1 to enable them (see scripts/Makefile.extrawarn) 716KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable) 717endif 718 719KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) 720ifdef CONFIG_FRAME_POINTER 721KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 722else 723# Some targets (ARM with Thumb2, for example), can't be built with frame 724# pointers. For those, we don't have FUNCTION_TRACER automatically 725# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 726# incompatible with -fomit-frame-pointer with current GCC, so we don't use 727# -fomit-frame-pointer with FUNCTION_TRACER. 728ifndef CONFIG_FUNCTION_TRACER 729KBUILD_CFLAGS += -fomit-frame-pointer 730endif 731endif 732 733KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments) 734 735ifdef CONFIG_DEBUG_INFO 736ifdef CONFIG_DEBUG_INFO_SPLIT 737KBUILD_CFLAGS += $(call cc-option, -gsplit-dwarf, -g) 738else 739KBUILD_CFLAGS += -g 740endif 741KBUILD_AFLAGS += -Wa,-gdwarf-2 742endif 743ifdef CONFIG_DEBUG_INFO_DWARF4 744KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,) 745endif 746 747ifdef CONFIG_DEBUG_INFO_REDUCED 748KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \ 749 $(call cc-option,-fno-var-tracking) 750endif 751 752ifdef CONFIG_FUNCTION_TRACER 753ifdef CONFIG_FTRACE_MCOUNT_RECORD 754 # gcc 5 supports generating the mcount tables directly 755 ifeq ($(call cc-option-yn,-mrecord-mcount),y) 756 CC_FLAGS_FTRACE += -mrecord-mcount 757 export CC_USING_RECORD_MCOUNT := 1 758 endif 759 ifdef CONFIG_HAVE_NOP_MCOUNT 760 ifeq ($(call cc-option-yn, -mnop-mcount),y) 761 CC_FLAGS_FTRACE += -mnop-mcount 762 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 763 endif 764 endif 765endif 766ifdef CONFIG_HAVE_FENTRY 767 ifeq ($(call cc-option-yn, -mfentry),y) 768 CC_FLAGS_FTRACE += -mfentry 769 CC_FLAGS_USING += -DCC_USING_FENTRY 770 endif 771endif 772export CC_FLAGS_FTRACE 773KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 774KBUILD_AFLAGS += $(CC_FLAGS_USING) 775ifdef CONFIG_DYNAMIC_FTRACE 776 ifdef CONFIG_HAVE_C_RECORDMCOUNT 777 BUILD_C_RECORDMCOUNT := y 778 export BUILD_C_RECORDMCOUNT 779 endif 780endif 781endif 782 783# We trigger additional mismatches with less inlining 784ifdef CONFIG_DEBUG_SECTION_MISMATCH 785KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) 786endif 787 788ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 789KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 790LDFLAGS_vmlinux += --gc-sections 791endif 792 793# arch Makefile may override CC so keep this after arch Makefile is included 794NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) 795 796# warn about C99 declaration after statement 797KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,) 798 799# disable pointer signed / unsigned warnings in gcc 4.0 800KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign) 801 802# disable stringop warnings in gcc 8+ 803KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation) 804 805# disable invalid "can't wrap" optimizations for signed / pointers 806KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow) 807 808# clang sets -fmerge-all-constants by default as optimization, but this 809# is non-conforming behavior for C and in fact breaks the kernel, so we 810# need to disable it here generally. 811KBUILD_CFLAGS += $(call cc-option,-fno-merge-all-constants) 812 813# for gcc -fno-merge-all-constants disables everything, but it is fine 814# to have actual conforming behavior enabled. 815KBUILD_CFLAGS += $(call cc-option,-fmerge-constants) 816 817# Make sure -fstack-check isn't enabled (like gentoo apparently did) 818KBUILD_CFLAGS += $(call cc-option,-fno-stack-check,) 819 820# conserve stack if available 821KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) 822 823# disallow errors like 'EXPORT_GPL(foo);' with missing header 824KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int) 825 826# require functions to have arguments in prototypes, not empty 'int foo()' 827KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes) 828 829# Prohibit date/time macros, which would make the build non-deterministic 830KBUILD_CFLAGS += $(call cc-option,-Werror=date-time) 831 832# enforce correct pointer usage 833KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 834 835# Require designated initializers for all marked structures 836KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) 837 838# change __FILE__ to the relative path from the srctree 839KBUILD_CFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 840 841# use the deterministic mode of AR if available 842KBUILD_ARFLAGS := $(call ar-option,D) 843 844include scripts/Makefile.kasan 845include scripts/Makefile.extrawarn 846include scripts/Makefile.ubsan 847 848# Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the 849# last assignments 850KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS) 851KBUILD_AFLAGS += $(ARCH_AFLAGS) $(KAFLAGS) 852KBUILD_CFLAGS += $(ARCH_CFLAGS) $(KCFLAGS) 853 854# Use --build-id when available. 855LDFLAGS_BUILD_ID := $(call ld-option, --build-id) 856KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID) 857LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID) 858 859ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 860LDFLAGS_vmlinux += $(call ld-option, -X,) 861endif 862 863# insure the checker run with the right endianness 864CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 865 866# the checker needs the correct machine size 867CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 868 869# Default kernel image to build when no specific target is given. 870# KBUILD_IMAGE may be overruled on the command line or 871# set in the environment 872# Also any assignments in arch/$(ARCH)/Makefile take precedence over 873# this default value 874export KBUILD_IMAGE ?= vmlinux 875 876# 877# INSTALL_PATH specifies where to place the updated kernel and system map 878# images. Default is /boot, but you can set it to other values 879export INSTALL_PATH ?= /boot 880 881# 882# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 883# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 884# an argument if needed. Otherwise it defaults to the kernel install path 885# 886export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 887 888# 889# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 890# relocations required by build roots. This is not defined in the 891# makefile but the argument can be passed to make if needed. 892# 893 894MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 895export MODLIB 896 897# 898# INSTALL_MOD_STRIP, if defined, will cause modules to be 899# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then 900# the default option --strip-debug will be used. Otherwise, 901# INSTALL_MOD_STRIP value will be used as the options to the strip command. 902 903ifdef INSTALL_MOD_STRIP 904ifeq ($(INSTALL_MOD_STRIP),1) 905mod_strip_cmd = $(STRIP) --strip-debug 906else 907mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP) 908endif # INSTALL_MOD_STRIP=1 909else 910mod_strip_cmd = true 911endif # INSTALL_MOD_STRIP 912export mod_strip_cmd 913 914# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed 915# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP 916# or CONFIG_MODULE_COMPRESS_XZ. 917 918mod_compress_cmd = true 919ifdef CONFIG_MODULE_COMPRESS 920 ifdef CONFIG_MODULE_COMPRESS_GZIP 921 mod_compress_cmd = gzip -n -f 922 endif # CONFIG_MODULE_COMPRESS_GZIP 923 ifdef CONFIG_MODULE_COMPRESS_XZ 924 mod_compress_cmd = xz -f 925 endif # CONFIG_MODULE_COMPRESS_XZ 926endif # CONFIG_MODULE_COMPRESS 927export mod_compress_cmd 928 929# Select initial ramdisk compression format, default is gzip(1). 930# This shall be used by the dracut(8) tool while creating an initramfs image. 931# 932INITRD_COMPRESS-y := gzip 933INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2 934INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma 935INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz 936INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo 937INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4 938# do not export INITRD_COMPRESS, since we didn't actually 939# choose a sane default compression above. 940# export INITRD_COMPRESS := $(INITRD_COMPRESS-y) 941 942ifdef CONFIG_MODULE_SIG_ALL 943$(eval $(call config_filename,MODULE_SIG_KEY)) 944 945mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509 946else 947mod_sign_cmd = true 948endif 949export mod_sign_cmd 950 951ifdef CONFIG_STACK_VALIDATION 952 has_libelf := $(call try-run,\ 953 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0) 954 ifeq ($(has_libelf),1) 955 objtool_target := tools/objtool FORCE 956 else 957 ifdef CONFIG_UNWINDER_ORC 958 $(error "Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel") 959 else 960 $(warning "Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel") 961 endif 962 SKIP_STACK_VALIDATION := 1 963 export SKIP_STACK_VALIDATION 964 endif 965endif 966 967 968ifeq ($(KBUILD_EXTMOD),) 969core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/ 970 971vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \ 972 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 973 $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y))) 974 975vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \ 976 $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-)))) 977 978init-y := $(patsubst %/, %/built-in.a, $(init-y)) 979core-y := $(patsubst %/, %/built-in.a, $(core-y)) 980drivers-y := $(patsubst %/, %/built-in.a, $(drivers-y)) 981net-y := $(patsubst %/, %/built-in.a, $(net-y)) 982libs-y1 := $(patsubst %/, %/lib.a, $(libs-y)) 983libs-y2 := $(patsubst %/, %/built-in.a, $(filter-out %.a, $(libs-y))) 984virt-y := $(patsubst %/, %/built-in.a, $(virt-y)) 985 986# Externally visible symbols (used by link-vmlinux.sh) 987export KBUILD_VMLINUX_INIT := $(head-y) $(init-y) 988export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y2) $(drivers-y) $(net-y) $(virt-y) 989export KBUILD_VMLINUX_LIBS := $(libs-y1) 990export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 991export LDFLAGS_vmlinux 992# used by scripts/package/Makefile 993export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools) 994 995vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) $(KBUILD_VMLINUX_LIBS) 996 997# Recurse until adjust_autoksyms.sh is satisfied 998PHONY += autoksyms_recursive 999autoksyms_recursive: $(vmlinux-deps) 1000ifdef CONFIG_TRIM_UNUSED_KSYMS 1001 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ 1002 "$(MAKE) -f $(srctree)/Makefile vmlinux" 1003endif 1004 1005# For the kernel to actually contain only the needed exported symbols, 1006# we have to build modules as well to determine what those symbols are. 1007# (this can be evaluated only once include/config/auto.conf has been included) 1008ifdef CONFIG_TRIM_UNUSED_KSYMS 1009 KBUILD_MODULES := 1 1010endif 1011 1012autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h) 1013 1014$(autoksyms_h): 1015 $(Q)mkdir -p $(dir $@) 1016 $(Q)touch $@ 1017 1018ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink) 1019 1020# Final link of vmlinux with optional arch pass after final link 1021cmd_link-vmlinux = \ 1022 $(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ; \ 1023 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) 1024 1025vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE 1026ifdef CONFIG_HEADERS_CHECK 1027 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check 1028endif 1029ifdef CONFIG_GDB_SCRIPTS 1030 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1031endif 1032 +$(call if_changed,link-vmlinux) 1033 1034# Build samples along the rest of the kernel. This needs headers_install. 1035ifdef CONFIG_SAMPLES 1036vmlinux-dirs += samples 1037samples: headers_install 1038endif 1039 1040# The actual objects are generated when descending, 1041# make sure no implicit rule kicks in 1042$(sort $(vmlinux-deps)): $(vmlinux-dirs) ; 1043 1044# Handle descending into subdirectories listed in $(vmlinux-dirs) 1045# Preset locale variables to speed up the build process. Limit locale 1046# tweaks to this spot to avoid wrong language settings when running 1047# make menuconfig etc. 1048# Error messages still appears in the original language 1049 1050PHONY += $(vmlinux-dirs) 1051$(vmlinux-dirs): prepare scripts 1052 $(Q)$(MAKE) $(build)=$@ need-builtin=1 1053 1054define filechk_kernel.release 1055 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1056endef 1057 1058# Store (new) KERNELRELEASE string in include/config/kernel.release 1059include/config/kernel.release: $(srctree)/Makefile FORCE 1060 $(call filechk,kernel.release) 1061 1062# Additional helpers built in scripts/ 1063# Carefully list dependencies so we do not try to build scripts twice 1064# in parallel 1065PHONY += scripts 1066scripts: scripts_basic asm-generic gcc-plugins $(autoksyms_h) 1067 $(Q)$(MAKE) $(build)=$(@) 1068 1069# Things we need to do before we recursively start building the kernel 1070# or the modules are listed in "prepare". 1071# A multi level approach is used. prepareN is processed before prepareN-1. 1072# archprepare is used in arch Makefiles and when processed asm symlink, 1073# version.h and scripts_basic is processed / created. 1074 1075# Listed in dependency order 1076PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3 1077 1078# prepare3 is used to check if we are building in a separate output directory, 1079# and if so do: 1080# 1) Check that make has not been executed in the kernel src $(srctree) 1081prepare3: include/config/kernel.release 1082ifneq ($(KBUILD_SRC),) 1083 @$(kecho) ' Using $(srctree) as source for kernel' 1084 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \ 1085 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \ 1086 echo >&2 " in the '$(srctree)' directory.";\ 1087 /bin/false; \ 1088 fi; 1089endif 1090 1091# prepare2 creates a makefile if using a separate output directory. 1092# From this point forward, .config has been reprocessed, so any rules 1093# that need to depend on updated CONFIG_* values can be checked here. 1094prepare2: prepare3 outputmakefile asm-generic 1095 1096prepare1: prepare2 $(version_h) $(autoksyms_h) include/generated/utsrelease.h 1097 $(cmd_crmodverdir) 1098 1099archprepare: archheaders archscripts prepare1 scripts_basic 1100 1101prepare0: archprepare gcc-plugins 1102 $(Q)$(MAKE) $(build)=. 1103 1104# All the preparing.. 1105prepare: prepare0 prepare-objtool 1106 1107# Support for using generic headers in asm-generic 1108PHONY += asm-generic uapi-asm-generic 1109asm-generic: uapi-asm-generic 1110 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \ 1111 src=asm obj=arch/$(SRCARCH)/include/generated/asm 1112uapi-asm-generic: 1113 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \ 1114 src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm 1115 1116PHONY += prepare-objtool 1117prepare-objtool: $(objtool_target) 1118 1119# Generate some files 1120# --------------------------------------------------------------------------- 1121 1122# KERNELRELEASE can change from a few different places, meaning version.h 1123# needs to be updated, so this check is forced on all builds 1124 1125uts_len := 64 1126define filechk_utsrelease.h 1127 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1128 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1129 exit 1; \ 1130 fi; \ 1131 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";) 1132endef 1133 1134define filechk_version.h 1135 (echo \#define LINUX_VERSION_CODE $(shell \ 1136 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \ 1137 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';) 1138endef 1139 1140$(version_h): FORCE 1141 $(call filechk,version.h) 1142 $(Q)rm -f $(old_version_h) 1143 1144include/generated/utsrelease.h: include/config/kernel.release FORCE 1145 $(call filechk,utsrelease.h) 1146 1147PHONY += headerdep 1148headerdep: 1149 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1150 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1151 1152# --------------------------------------------------------------------------- 1153# Kernel headers 1154 1155#Default location for installed headers 1156export INSTALL_HDR_PATH = $(objtree)/usr 1157 1158# If we do an all arch process set dst to include/arch-$(SRCARCH) 1159hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(SRCARCH), dst=include) 1160 1161PHONY += archheaders 1162archheaders: 1163 1164PHONY += archscripts 1165archscripts: 1166 1167PHONY += __headers 1168__headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts 1169 $(Q)$(MAKE) $(build)=scripts build_unifdef 1170 1171PHONY += headers_install_all 1172headers_install_all: 1173 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install 1174 1175PHONY += headers_install 1176headers_install: __headers 1177 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \ 1178 $(error Headers not exportable for the $(SRCARCH) architecture)) 1179 $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include 1180 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) 1181 1182PHONY += headers_check_all 1183headers_check_all: headers_install_all 1184 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check 1185 1186PHONY += headers_check 1187headers_check: headers_install 1188 $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1 1189 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) HDRCHECK=1 1190 1191# --------------------------------------------------------------------------- 1192# Kernel selftest 1193 1194PHONY += kselftest 1195kselftest: 1196 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1197 1198PHONY += kselftest-clean 1199kselftest-clean: 1200 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean 1201 1202PHONY += kselftest-merge 1203kselftest-merge: 1204 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1205 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \ 1206 -m $(objtree)/.config \ 1207 $(srctree)/tools/testing/selftests/*/config 1208 +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1209 1210# --------------------------------------------------------------------------- 1211# Modules 1212 1213ifdef CONFIG_MODULES 1214 1215# By default, build modules as well 1216 1217all: modules 1218 1219# Build modules 1220# 1221# A module can be listed more than once in obj-m resulting in 1222# duplicate lines in modules.order files. Those are removed 1223# using awk while concatenating to the final file. 1224 1225PHONY += modules 1226modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin 1227 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order 1228 @$(kecho) ' Building modules, stage 2.'; 1229 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1230 1231modules.builtin: $(vmlinux-dirs:%=%/modules.builtin) 1232 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin 1233 1234%/modules.builtin: include/config/auto.conf include/config/tristate.conf 1235 $(Q)$(MAKE) $(modbuiltin)=$* 1236 1237 1238# Target to prepare building external modules 1239PHONY += modules_prepare 1240modules_prepare: prepare scripts 1241 1242# Target to install modules 1243PHONY += modules_install 1244modules_install: _modinst_ _modinst_post 1245 1246PHONY += _modinst_ 1247_modinst_: 1248 @rm -rf $(MODLIB)/kernel 1249 @rm -f $(MODLIB)/source 1250 @mkdir -p $(MODLIB)/kernel 1251 @ln -s $(abspath $(srctree)) $(MODLIB)/source 1252 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1253 rm -f $(MODLIB)/build ; \ 1254 ln -s $(CURDIR) $(MODLIB)/build ; \ 1255 fi 1256 @cp -f $(objtree)/modules.order $(MODLIB)/ 1257 @cp -f $(objtree)/modules.builtin $(MODLIB)/ 1258 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1259 1260# This depmod is only for convenience to give the initial 1261# boot a modules.dep even before / is mounted read-write. However the 1262# boot script depmod is the master version. 1263PHONY += _modinst_post 1264_modinst_post: _modinst_ 1265 $(call cmd,depmod) 1266 1267ifeq ($(CONFIG_MODULE_SIG), y) 1268PHONY += modules_sign 1269modules_sign: 1270 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign 1271endif 1272 1273else # CONFIG_MODULES 1274 1275# Modules not configured 1276# --------------------------------------------------------------------------- 1277 1278PHONY += modules modules_install 1279modules modules_install: 1280 @echo >&2 1281 @echo >&2 "The present kernel configuration has modules disabled." 1282 @echo >&2 "Type 'make config' and enable loadable module support." 1283 @echo >&2 "Then build a kernel with module support enabled." 1284 @echo >&2 1285 @exit 1 1286 1287endif # CONFIG_MODULES 1288 1289### 1290# Cleaning is done on three levels. 1291# make clean Delete most generated files 1292# Leave enough to build external modules 1293# make mrproper Delete the current configuration, and all generated files 1294# make distclean Remove editor backup files, patch leftover files and the like 1295 1296# Directories & files removed with 'make clean' 1297CLEAN_DIRS += $(MODVERDIR) include/ksym 1298 1299# Directories & files removed with 'make mrproper' 1300MRPROPER_DIRS += include/config usr/include include/generated \ 1301 arch/*/include/generated .tmp_objdiff 1302MRPROPER_FILES += .config .config.old .version \ 1303 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \ 1304 signing_key.pem signing_key.priv signing_key.x509 \ 1305 x509.genkey extra_certificates signing_key.x509.keyid \ 1306 signing_key.x509.signer vmlinux-gdb.py 1307 1308# clean - Delete most, but leave enough to build external modules 1309# 1310clean: rm-dirs := $(CLEAN_DIRS) 1311clean: rm-files := $(CLEAN_FILES) 1312clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples) 1313 1314PHONY += $(clean-dirs) clean archclean vmlinuxclean 1315$(clean-dirs): 1316 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1317 1318vmlinuxclean: 1319 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1320 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1321 1322clean: archclean vmlinuxclean 1323 1324# mrproper - Delete all generated files, including .config 1325# 1326mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS)) 1327mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1328mrproper-dirs := $(addprefix _mrproper_,scripts) 1329 1330PHONY += $(mrproper-dirs) mrproper archmrproper 1331$(mrproper-dirs): 1332 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1333 1334mrproper: clean archmrproper $(mrproper-dirs) 1335 $(call cmd,rmdirs) 1336 $(call cmd,rmfiles) 1337 1338# distclean 1339# 1340PHONY += distclean 1341 1342distclean: mrproper 1343 @find $(srctree) $(RCS_FIND_IGNORE) \ 1344 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1345 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1346 -o -name 'core' \) \ 1347 -type f -print | xargs rm -f 1348 1349 1350# Packaging of the kernel to various formats 1351# --------------------------------------------------------------------------- 1352package-dir := scripts/package 1353 1354%src-pkg: FORCE 1355 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1356%pkg: include/config/kernel.release FORCE 1357 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1358 1359 1360# Brief documentation of the typical targets used 1361# --------------------------------------------------------------------------- 1362 1363boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1364boards := $(sort $(notdir $(boards))) 1365board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1366board-dirs := $(sort $(notdir $(board-dirs:/=))) 1367 1368PHONY += help 1369help: 1370 @echo 'Cleaning targets:' 1371 @echo ' clean - Remove most generated files but keep the config and' 1372 @echo ' enough build support to build external modules' 1373 @echo ' mrproper - Remove all generated files + config + various backup files' 1374 @echo ' distclean - mrproper + remove editor backup and patch files' 1375 @echo '' 1376 @echo 'Configuration targets:' 1377 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1378 @echo '' 1379 @echo 'Other generic targets:' 1380 @echo ' all - Build all targets marked with [*]' 1381 @echo '* vmlinux - Build the bare kernel' 1382 @echo '* modules - Build all modules' 1383 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1384 @echo ' dir/ - Build all files in dir and below' 1385 @echo ' dir/file.[ois] - Build specified target only' 1386 @echo ' dir/file.ll - Build the LLVM assembly file' 1387 @echo ' (requires compiler support for LLVM assembly generation)' 1388 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1389 @echo ' (requires a recent binutils and recent build (System.map))' 1390 @echo ' dir/file.ko - Build module including final link' 1391 @echo ' modules_prepare - Set up for building external modules' 1392 @echo ' tags/TAGS - Generate tags file for editors' 1393 @echo ' cscope - Generate cscope index' 1394 @echo ' gtags - Generate GNU GLOBAL index' 1395 @echo ' kernelrelease - Output the release version string (use with make -s)' 1396 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1397 @echo ' image_name - Output the image name (use with make -s)' 1398 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1399 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1400 echo '' 1401 @echo 'Static analysers:' 1402 @echo ' checkstack - Generate a list of stack hogs' 1403 @echo ' namespacecheck - Name space analysis on compiled kernel' 1404 @echo ' versioncheck - Sanity check on version.h usage' 1405 @echo ' includecheck - Check for duplicate included header files' 1406 @echo ' export_report - List the usages of all exported symbols' 1407 @echo ' headers_check - Sanity check on exported headers' 1408 @echo ' headerdep - Detect inclusion cycles in headers' 1409 @echo ' coccicheck - Check with Coccinelle' 1410 @echo '' 1411 @echo 'Kernel selftest:' 1412 @echo ' kselftest - Build and run kernel selftest (run as root)' 1413 @echo ' Build, install, and boot kernel before' 1414 @echo ' running kselftest on it' 1415 @echo ' kselftest-clean - Remove all generated kselftest files' 1416 @echo ' kselftest-merge - Merge all the config dependencies of kselftest to existing' 1417 @echo ' .config.' 1418 @echo '' 1419 @echo 'Userspace tools targets:' 1420 @echo ' use "make tools/help"' 1421 @echo ' or "cd tools; make help"' 1422 @echo '' 1423 @echo 'Kernel packaging:' 1424 @$(MAKE) $(build)=$(package-dir) help 1425 @echo '' 1426 @echo 'Documentation targets:' 1427 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1428 @echo '' 1429 @echo 'Architecture specific targets ($(SRCARCH)):' 1430 @$(if $(archhelp),$(archhelp),\ 1431 echo ' No architecture specific help defined for $(SRCARCH)') 1432 @echo '' 1433 @$(if $(boards), \ 1434 $(foreach b, $(boards), \ 1435 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1436 echo '') 1437 @$(if $(board-dirs), \ 1438 $(foreach b, $(board-dirs), \ 1439 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1440 printf " %-16s - Show all of the above\\n" help-boards; \ 1441 echo '') 1442 1443 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1444 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1445 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1446 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK (sparse by default)' 1447 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1448 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1449 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where' 1450 @echo ' 1: warnings which may be relevant and do not occur too often' 1451 @echo ' 2: warnings which occur quite often but may still be relevant' 1452 @echo ' 3: more obscure warnings, can most likely be ignored' 1453 @echo ' Multiple levels can be combined with W=12 or W=123' 1454 @echo '' 1455 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1456 @echo 'For further info see the ./README file' 1457 1458 1459help-board-dirs := $(addprefix help-,$(board-dirs)) 1460 1461help-boards: $(help-board-dirs) 1462 1463boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1464 1465$(help-board-dirs): help-%: 1466 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1467 @$(if $(boards-per-dir), \ 1468 $(foreach b, $(boards-per-dir), \ 1469 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1470 echo '') 1471 1472 1473# Documentation targets 1474# --------------------------------------------------------------------------- 1475DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1476 linkcheckdocs dochelp refcheckdocs 1477PHONY += $(DOC_TARGETS) 1478$(DOC_TARGETS): scripts_basic FORCE 1479 $(Q)$(MAKE) $(build)=Documentation $@ 1480 1481else # KBUILD_EXTMOD 1482 1483### 1484# External module support. 1485# When building external modules the kernel used as basis is considered 1486# read-only, and no consistency checks are made and the make 1487# system is not used on the basis kernel. If updates are required 1488# in the basis kernel ordinary make commands (without M=...) must 1489# be used. 1490# 1491# The following are the only valid targets when building external 1492# modules. 1493# make M=dir clean Delete all automatically generated files 1494# make M=dir modules Make all modules in specified dir 1495# make M=dir Same as 'make M=dir modules' 1496# make M=dir modules_install 1497# Install the modules built in the module directory 1498# Assumes install directory is already created 1499 1500# We are always building modules 1501KBUILD_MODULES := 1 1502PHONY += crmodverdir 1503crmodverdir: 1504 $(cmd_crmodverdir) 1505 1506PHONY += $(objtree)/Module.symvers 1507$(objtree)/Module.symvers: 1508 @test -e $(objtree)/Module.symvers || ( \ 1509 echo; \ 1510 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \ 1511 echo " is missing; modules will have no dependencies and modversions."; \ 1512 echo ) 1513 1514module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD)) 1515PHONY += $(module-dirs) modules 1516$(module-dirs): crmodverdir $(objtree)/Module.symvers 1517 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@) 1518 1519modules: $(module-dirs) 1520 @$(kecho) ' Building modules, stage 2.'; 1521 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1522 1523PHONY += modules_install 1524modules_install: _emodinst_ _emodinst_post 1525 1526install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra) 1527PHONY += _emodinst_ 1528_emodinst_: 1529 $(Q)mkdir -p $(MODLIB)/$(install-dir) 1530 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1531 1532PHONY += _emodinst_post 1533_emodinst_post: _emodinst_ 1534 $(call cmd,depmod) 1535 1536clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD)) 1537 1538PHONY += $(clean-dirs) clean 1539$(clean-dirs): 1540 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1541 1542clean: rm-dirs := $(MODVERDIR) 1543clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers 1544 1545PHONY += help 1546help: 1547 @echo ' Building external modules.' 1548 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1549 @echo '' 1550 @echo ' modules - default target, build the module(s)' 1551 @echo ' modules_install - install the module' 1552 @echo ' clean - remove generated files in module directory only' 1553 @echo '' 1554 1555# Dummies... 1556PHONY += prepare scripts 1557prepare: ; 1558scripts: ; 1559endif # KBUILD_EXTMOD 1560 1561clean: $(clean-dirs) 1562 $(call cmd,rmdirs) 1563 $(call cmd,rmfiles) 1564 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1565 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \ 1566 -o -name '*.ko.*' -o -name '*.dtb' -o -name '*.dtb.S' \ 1567 -o -name '*.dwo' -o -name '*.lst' \ 1568 -o -name '*.su' \ 1569 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1570 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 1571 -o -name '*.asn1.[ch]' \ 1572 -o -name '*.symtypes' -o -name 'modules.order' \ 1573 -o -name modules.builtin -o -name '.tmp_*.o.*' \ 1574 -o -name '*.c.[012]*.*' \ 1575 -o -name '*.ll' \ 1576 -o -name '*.gcno' \) -type f -print | xargs rm -f 1577 1578# Generate tags for editors 1579# --------------------------------------------------------------------------- 1580quiet_cmd_tags = GEN $@ 1581 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@ 1582 1583tags TAGS cscope gtags: FORCE 1584 $(call cmd,tags) 1585 1586# Scripts to check various things for consistency 1587# --------------------------------------------------------------------------- 1588 1589PHONY += includecheck versioncheck coccicheck namespacecheck export_report 1590 1591includecheck: 1592 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1593 -name '*.[hcS]' -type f -print | sort \ 1594 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1595 1596versioncheck: 1597 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1598 -name '*.[hcS]' -type f -print | sort \ 1599 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1600 1601coccicheck: 1602 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@ 1603 1604namespacecheck: 1605 $(PERL) $(srctree)/scripts/namespace.pl 1606 1607export_report: 1608 $(PERL) $(srctree)/scripts/export_report.pl 1609 1610endif #ifeq ($(config-targets),1) 1611endif #ifeq ($(mixed-targets),1) 1612 1613PHONY += checkstack kernelrelease kernelversion image_name 1614 1615# UML needs a little special treatment here. It wants to use the host 1616# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1617# else wants $(ARCH), including people doing cross-builds, which means 1618# that $(SUBARCH) doesn't work here. 1619ifeq ($(ARCH), um) 1620CHECKSTACK_ARCH := $(SUBARCH) 1621else 1622CHECKSTACK_ARCH := $(ARCH) 1623endif 1624checkstack: 1625 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1626 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1627 1628kernelrelease: 1629 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1630 1631kernelversion: 1632 @echo $(KERNELVERSION) 1633 1634image_name: 1635 @echo $(KBUILD_IMAGE) 1636 1637# Clear a bunch of variables before executing the submake 1638tools/: FORCE 1639 $(Q)mkdir -p $(objtree)/tools 1640 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ 1641 1642tools/%: FORCE 1643 $(Q)mkdir -p $(objtree)/tools 1644 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $* 1645 1646# Single targets 1647# --------------------------------------------------------------------------- 1648# Single targets are compatible with: 1649# - build with mixed source and output 1650# - build with separate output dir 'make O=...' 1651# - external modules 1652# 1653# target-dir => where to store outputfile 1654# build-dir => directory in kernel source tree to use 1655 1656ifeq ($(KBUILD_EXTMOD),) 1657 build-dir = $(patsubst %/,%,$(dir $@)) 1658 target-dir = $(dir $@) 1659else 1660 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@))) 1661 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash)) 1662 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@)) 1663endif 1664 1665%.s: %.c prepare scripts FORCE 1666 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1667%.i: %.c prepare scripts FORCE 1668 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1669%.o: %.c prepare scripts FORCE 1670 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1671%.lst: %.c prepare scripts FORCE 1672 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1673%.s: %.S prepare scripts FORCE 1674 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1675%.o: %.S prepare scripts FORCE 1676 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1677%.symtypes: %.c prepare scripts FORCE 1678 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1679%.ll: %.c prepare scripts FORCE 1680 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1681 1682# Modules 1683/: prepare scripts FORCE 1684 $(cmd_crmodverdir) 1685 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1686 $(build)=$(build-dir) 1687# Make sure the latest headers are built for Documentation 1688Documentation/ samples/: headers_install 1689%/: prepare scripts FORCE 1690 $(cmd_crmodverdir) 1691 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1692 $(build)=$(build-dir) 1693%.ko: prepare scripts FORCE 1694 $(cmd_crmodverdir) 1695 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1696 $(build)=$(build-dir) $(@:.ko=.o) 1697 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1698 1699# FIXME Should go into a make.lib or something 1700# =========================================================================== 1701 1702quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs))) 1703 cmd_rmdirs = rm -rf $(rm-dirs) 1704 1705quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1706 cmd_rmfiles = rm -f $(rm-files) 1707 1708# Run depmod only if we have System.map and depmod is executable 1709quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) 1710 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1711 $(KERNELRELEASE) 1712 1713# Create temporary dir for module support files 1714# clean it up only when building all modules 1715cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \ 1716 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*) 1717 1718# read all saved command lines 1719 1720cmd_files := $(wildcard .*.cmd $(foreach f,$(sort $(targets)),$(dir $(f)).$(notdir $(f)).cmd)) 1721 1722ifneq ($(cmd_files),) 1723 $(cmd_files): ; # Do not try to update included dependency files 1724 include $(cmd_files) 1725endif 1726 1727endif # skip-makefile 1728 1729PHONY += FORCE 1730FORCE: 1731 1732# Declare the contents of the PHONY variable as phony. We keep that 1733# information in a variable so we can use it in if_changed and friends. 1734.PHONY: $(PHONY) 1735