1# SPDX-License-Identifier: GPL-2.0 2VERSION = 5 3PATCHLEVEL = 1 4SUBLEVEL = 0 5EXTRAVERSION = -rc2 6NAME = Shy Crocodile 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# We are using a recursive build, so we need to do a little thinking 19# to get the ordering right. 20# 21# Most importantly: sub-Makefiles should only ever modify files in 22# their own directory. If in some directory we have a dependency on 23# a file in another dir (which doesn't happen often, but it's often 24# unavoidable when linking the built-in.a targets which finally 25# turn into vmlinux), we will call a sub make in that other dir, and 26# after that we are sure that everything which is in that other dir 27# is now up to date. 28# 29# The only cases where we need to modify files which have global 30# effects are thus separated out and done before the recursive 31# descending is started. They are now explicitly listed as the 32# prepare rule. 33 34# Ugly workaround for Debian make-kpkg: 35# make-kpkg directly includes the top Makefile of Linux kernel. In such a case, 36# skip sub-make to support debian_* targets in ruleset/kernel_version.mk, but 37# displays warning to discourage such abusage. 38ifneq ($(word 2, $(MAKEFILE_LIST)),) 39$(warning Do not include top Makefile of Linux Kernel) 40sub-make-done := 1 41MAKEFLAGS += -rR 42endif 43 44ifneq ($(sub-make-done),1) 45 46# Do not use make's built-in rules and variables 47# (this increases performance and avoids hard-to-debug behaviour) 48MAKEFLAGS += -rR 49 50# 'MAKEFLAGS += -rR' does not become immediately effective for old 51# GNU Make versions. Cancel implicit rules for this Makefile. 52$(lastword $(MAKEFILE_LIST)): ; 53 54# Avoid funny character set dependencies 55unexport LC_ALL 56LC_COLLATE=C 57LC_NUMERIC=C 58export LC_COLLATE LC_NUMERIC 59 60# Avoid interference with shell env settings 61unexport GREP_OPTIONS 62 63# Beautify output 64# --------------------------------------------------------------------------- 65# 66# Normally, we echo the whole command before executing it. By making 67# that echo $($(quiet)$(cmd)), we now have the possibility to set 68# $(quiet) to choose other forms of output instead, e.g. 69# 70# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@ 71# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< 72# 73# If $(quiet) is empty, the whole command will be printed. 74# If it is set to "quiet_", only the short version will be printed. 75# If it is set to "silent_", nothing will be printed at all, since 76# the variable $(silent_cmd_cc_o_c) doesn't exist. 77# 78# A simple variant is to prefix commands with $(Q) - that's useful 79# for commands that shall be hidden in non-verbose mode. 80# 81# $(Q)ln $@ :< 82# 83# If KBUILD_VERBOSE equals 0 then the above command will be hidden. 84# If KBUILD_VERBOSE equals 1 then the above command is displayed. 85# 86# To put more focus on warnings, be less verbose as default 87# Use 'make V=1' to see the full commands 88 89ifeq ("$(origin V)", "command line") 90 KBUILD_VERBOSE = $(V) 91endif 92ifndef KBUILD_VERBOSE 93 KBUILD_VERBOSE = 0 94endif 95 96ifeq ($(KBUILD_VERBOSE),1) 97 quiet = 98 Q = 99else 100 quiet=quiet_ 101 Q = @ 102endif 103 104# If the user is running make -s (silent mode), suppress echoing of 105# commands 106 107ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),) 108 quiet=silent_ 109endif 110 111export quiet Q KBUILD_VERBOSE 112 113# kbuild supports saving output files in a separate directory. 114# To locate output files in a separate directory two syntaxes are supported. 115# In both cases the working directory must be the root of the kernel src. 116# 1) O= 117# Use "make O=dir/to/store/output/files/" 118# 119# 2) Set KBUILD_OUTPUT 120# Set the environment variable KBUILD_OUTPUT to point to the directory 121# where the output files shall be placed. 122# export KBUILD_OUTPUT=dir/to/store/output/files/ 123# make 124# 125# The O= assignment takes precedence over the KBUILD_OUTPUT environment 126# variable. 127 128# KBUILD_SRC is not intended to be used by the regular user (for now), 129# it is set on invocation of make with KBUILD_OUTPUT or O= specified. 130 131# OK, Make called in directory where kernel src resides 132# Do we want to locate output files in a separate directory? 133ifeq ("$(origin O)", "command line") 134 KBUILD_OUTPUT := $(O) 135endif 136 137ifneq ($(words $(subst :, ,$(CURDIR))), 1) 138 $(error main directory cannot contain spaces nor colons) 139endif 140 141ifneq ($(KBUILD_OUTPUT),) 142# check that the output directory actually exists 143saved-output := $(KBUILD_OUTPUT) 144KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \ 145 && pwd) 146$(if $(KBUILD_OUTPUT),, \ 147 $(error failed to create output directory "$(saved-output)")) 148 149# Look for make include files relative to root of kernel src 150# 151# This does not become effective immediately because MAKEFLAGS is re-parsed 152# once after the Makefile is read. It is OK since we are going to invoke 153# 'sub-make' below. 154MAKEFLAGS += --include-dir=$(CURDIR) 155 156else 157 158# Do not print "Entering directory ..." at all for in-tree build. 159MAKEFLAGS += --no-print-directory 160 161endif # ifneq ($(KBUILD_OUTPUT),) 162 163PHONY += $(MAKECMDGOALS) sub-make 164 165$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make 166 @: 167 168# Invoke a second make in the output directory, passing relevant variables 169sub-make: 170 $(Q)$(MAKE) sub-make-done=1 \ 171 $(if $(KBUILD_OUTPUT),-C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR)) \ 172 -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS)) 173 174else # sub-make-done 175# We process the rest of the Makefile if this is the final invocation of make 176 177# Do not print "Entering directory ...", 178# but we want to display it when entering to the output directory 179# so that IDEs/editors are able to understand relative filenames. 180MAKEFLAGS += --no-print-directory 181 182# Call a source code checker (by default, "sparse") as part of the 183# C compilation. 184# 185# Use 'make C=1' to enable checking of only re-compiled files. 186# Use 'make C=2' to enable checking of *all* source files, regardless 187# of whether they are re-compiled or not. 188# 189# See the file "Documentation/dev-tools/sparse.rst" for more details, 190# including where to get the "sparse" utility. 191 192ifeq ("$(origin C)", "command line") 193 KBUILD_CHECKSRC = $(C) 194endif 195ifndef KBUILD_CHECKSRC 196 KBUILD_CHECKSRC = 0 197endif 198 199# Use make M=dir to specify directory of external module to build 200# Old syntax make ... SUBDIRS=$PWD is still supported 201# Setting the environment variable KBUILD_EXTMOD take precedence 202ifdef SUBDIRS 203 $(warning ================= WARNING ================) 204 $(warning 'SUBDIRS' will be removed after Linux 5.3) 205 $(warning Please use 'M=' or 'KBUILD_EXTMOD' instead) 206 $(warning ==========================================) 207 KBUILD_EXTMOD ?= $(SUBDIRS) 208endif 209 210ifeq ("$(origin M)", "command line") 211 KBUILD_EXTMOD := $(M) 212endif 213 214ifeq ($(KBUILD_SRC),) 215 # building in the source tree 216 srctree := . 217else 218 ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR))) 219 # building in a subdirectory of the source tree 220 srctree := .. 221 else 222 srctree := $(KBUILD_SRC) 223 endif 224endif 225 226export KBUILD_CHECKSRC KBUILD_EXTMOD KBUILD_SRC 227 228objtree := . 229src := $(srctree) 230obj := $(objtree) 231 232VPATH := $(srctree) 233 234export srctree objtree VPATH 235 236# To make sure we do not include .config for any of the *config targets 237# catch them early, and hand them over to scripts/kconfig/Makefile 238# It is allowed to specify more targets when calling make, including 239# mixing *config targets and build targets. 240# For example 'make oldconfig all'. 241# Detect when mixed targets is specified, and make a second invocation 242# of make so .config is not included in this case either (for *config). 243 244version_h := include/generated/uapi/linux/version.h 245old_version_h := include/linux/version.h 246 247clean-targets := %clean mrproper cleandocs 248no-dot-config-targets := $(clean-targets) \ 249 cscope gtags TAGS tags help% %docs check% coccicheck \ 250 $(version_h) headers_% archheaders archscripts \ 251 %asm-generic kernelversion %src-pkg 252no-sync-config-targets := $(no-dot-config-targets) install %install \ 253 kernelrelease 254 255config-targets := 0 256mixed-targets := 0 257dot-config := 1 258may-sync-config := 1 259 260ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 261 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 262 dot-config := 0 263 endif 264endif 265 266ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),) 267 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),) 268 may-sync-config := 0 269 endif 270endif 271 272ifneq ($(KBUILD_EXTMOD),) 273 may-sync-config := 0 274endif 275 276ifeq ($(KBUILD_EXTMOD),) 277 ifneq ($(filter config %config,$(MAKECMDGOALS)),) 278 config-targets := 1 279 ifneq ($(words $(MAKECMDGOALS)),1) 280 mixed-targets := 1 281 endif 282 endif 283endif 284 285# For "make -j clean all", "make -j mrproper defconfig all", etc. 286ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),) 287 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) 288 mixed-targets := 1 289 endif 290endif 291 292# install and modules_install need also be processed one by one 293ifneq ($(filter install,$(MAKECMDGOALS)),) 294 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 295 mixed-targets := 1 296 endif 297endif 298 299ifeq ($(mixed-targets),1) 300# =========================================================================== 301# We're called with mixed targets (*config and build targets). 302# Handle them one by one. 303 304PHONY += $(MAKECMDGOALS) __build_one_by_one 305 306$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one 307 @: 308 309__build_one_by_one: 310 $(Q)set -e; \ 311 for i in $(MAKECMDGOALS); do \ 312 $(MAKE) -f $(srctree)/Makefile $$i; \ 313 done 314 315else 316 317include scripts/Kbuild.include 318 319# Read KERNELRELEASE from include/config/kernel.release (if it exists) 320KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null) 321KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 322export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 323 324include scripts/subarch.include 325 326# Cross compiling and selecting different set of gcc/bin-utils 327# --------------------------------------------------------------------------- 328# 329# When performing cross compilation for other architectures ARCH shall be set 330# to the target architecture. (See arch/* for the possibilities). 331# ARCH can be set during invocation of make: 332# make ARCH=ia64 333# Another way is to have ARCH set in the environment. 334# The default ARCH is the host where make is executed. 335 336# CROSS_COMPILE specify the prefix used for all executables used 337# during compilation. Only gcc and related bin-utils executables 338# are prefixed with $(CROSS_COMPILE). 339# CROSS_COMPILE can be set on the command line 340# make CROSS_COMPILE=ia64-linux- 341# Alternatively CROSS_COMPILE can be set in the environment. 342# Default value for CROSS_COMPILE is not to prefix executables 343# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 344ARCH ?= $(SUBARCH) 345 346# Architecture as present in compile.h 347UTS_MACHINE := $(ARCH) 348SRCARCH := $(ARCH) 349 350# Additional ARCH settings for x86 351ifeq ($(ARCH),i386) 352 SRCARCH := x86 353endif 354ifeq ($(ARCH),x86_64) 355 SRCARCH := x86 356endif 357 358# Additional ARCH settings for sparc 359ifeq ($(ARCH),sparc32) 360 SRCARCH := sparc 361endif 362ifeq ($(ARCH),sparc64) 363 SRCARCH := sparc 364endif 365 366# Additional ARCH settings for sh 367ifeq ($(ARCH),sh64) 368 SRCARCH := sh 369endif 370 371KCONFIG_CONFIG ?= .config 372export KCONFIG_CONFIG 373 374# SHELL used by kbuild 375CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \ 376 else if [ -x /bin/bash ]; then echo /bin/bash; \ 377 else echo sh; fi ; fi) 378 379HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null) 380HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null) 381HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null) 382 383HOSTCC = gcc 384HOSTCXX = g++ 385KBUILD_HOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \ 386 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) \ 387 $(HOSTCFLAGS) 388KBUILD_HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) 389KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 390KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 391 392# Make variables (CC, etc...) 393AS = $(CROSS_COMPILE)as 394LD = $(CROSS_COMPILE)ld 395CC = $(CROSS_COMPILE)gcc 396CPP = $(CC) -E 397AR = $(CROSS_COMPILE)ar 398NM = $(CROSS_COMPILE)nm 399STRIP = $(CROSS_COMPILE)strip 400OBJCOPY = $(CROSS_COMPILE)objcopy 401OBJDUMP = $(CROSS_COMPILE)objdump 402LEX = flex 403YACC = bison 404AWK = awk 405INSTALLKERNEL := installkernel 406DEPMOD = /sbin/depmod 407PERL = perl 408PYTHON = python 409PYTHON2 = python2 410PYTHON3 = python3 411CHECK = sparse 412 413CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 414 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 415NOSTDINC_FLAGS := 416CFLAGS_MODULE = 417AFLAGS_MODULE = 418LDFLAGS_MODULE = 419CFLAGS_KERNEL = 420AFLAGS_KERNEL = 421LDFLAGS_vmlinux = 422 423# Use USERINCLUDE when you must reference the UAPI directories only. 424USERINCLUDE := \ 425 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 426 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 427 -I$(srctree)/include/uapi \ 428 -I$(objtree)/include/generated/uapi \ 429 -include $(srctree)/include/linux/kconfig.h 430 431# Use LINUXINCLUDE when you must reference the include/ directory. 432# Needed to be compatible with the O= option 433LINUXINCLUDE := \ 434 -I$(srctree)/arch/$(SRCARCH)/include \ 435 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 436 $(if $(KBUILD_SRC), -I$(srctree)/include) \ 437 -I$(objtree)/include \ 438 $(USERINCLUDE) 439 440KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 441KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \ 442 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \ 443 -Werror=implicit-function-declaration -Werror=implicit-int \ 444 -Wno-format-security \ 445 -std=gnu89 446KBUILD_CPPFLAGS := -D__KERNEL__ 447KBUILD_AFLAGS_KERNEL := 448KBUILD_CFLAGS_KERNEL := 449KBUILD_AFLAGS_MODULE := -DMODULE 450KBUILD_CFLAGS_MODULE := -DMODULE 451KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds 452KBUILD_LDFLAGS := 453GCC_PLUGINS_CFLAGS := 454 455export ARCH SRCARCH CONFIG_SHELL HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE AS LD CC 456export CPP AR NM STRIP OBJCOPY OBJDUMP KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS 457export MAKE LEX YACC AWK INSTALLKERNEL PERL PYTHON PYTHON2 PYTHON3 UTS_MACHINE 458export HOSTCXX KBUILD_HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS 459 460export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 461export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 462export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN 463export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 464export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 465export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 466export KBUILD_ARFLAGS 467 468# When compiling out-of-tree modules, put MODVERDIR in the module 469# tree rather than in the kernel tree. The kernel tree might 470# even be read-only. 471export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions 472 473# Files to ignore in find ... statements 474 475export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 476 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 477 -prune -o 478export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 479 --exclude CVS --exclude .pc --exclude .hg --exclude .git 480 481# =========================================================================== 482# Rules shared between *config targets and build targets 483 484# Basic helpers built in scripts/basic/ 485PHONY += scripts_basic 486scripts_basic: 487 $(Q)$(MAKE) $(build)=scripts/basic 488 $(Q)rm -f .tmp_quiet_recordmcount 489 490PHONY += outputmakefile 491# outputmakefile generates a Makefile in the output directory, if using a 492# separate output directory. This allows convenient use of make in the 493# output directory. 494# At the same time when output Makefile generated, generate .gitignore to 495# ignore whole output directory 496outputmakefile: 497ifneq ($(KBUILD_SRC),) 498 $(Q)ln -fsn $(srctree) source 499 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree) 500 $(Q){ echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 501endif 502 503ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),) 504ifneq ($(CROSS_COMPILE),) 505CLANG_FLAGS := --target=$(notdir $(CROSS_COMPILE:%-=%)) 506GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit)) 507CLANG_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR) 508GCC_TOOLCHAIN := $(realpath $(GCC_TOOLCHAIN_DIR)/..) 509endif 510ifneq ($(GCC_TOOLCHAIN),) 511CLANG_FLAGS += --gcc-toolchain=$(GCC_TOOLCHAIN) 512endif 513CLANG_FLAGS += -no-integrated-as 514KBUILD_CFLAGS += $(CLANG_FLAGS) 515KBUILD_AFLAGS += $(CLANG_FLAGS) 516export CLANG_FLAGS 517endif 518 519RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register 520RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register 521RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk 522RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline 523RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG))) 524RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG))) 525export RETPOLINE_CFLAGS 526export RETPOLINE_VDSO_CFLAGS 527 528# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 529# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 530# CC_VERSION_TEXT is referenced from Kconfig (so it needs export), 531# and from include/config/auto.conf.cmd to detect the compiler upgrade. 532CC_VERSION_TEXT = $(shell $(CC) --version | head -n 1) 533 534ifeq ($(config-targets),1) 535# =========================================================================== 536# *config targets only - make sure prerequisites are updated, and descend 537# in scripts/kconfig to make the *config target 538 539# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 540# KBUILD_DEFCONFIG may point out an alternative default configuration 541# used for 'make defconfig' 542include arch/$(SRCARCH)/Makefile 543export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT 544 545config: scripts_basic outputmakefile FORCE 546 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 547 548%config: scripts_basic outputmakefile FORCE 549 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 550 551else 552# =========================================================================== 553# Build targets only - this includes vmlinux, arch specific targets, clean 554# targets and others. In general all targets except *config targets. 555 556# If building an external module we do not care about the all: rule 557# but instead _all depend on modules 558PHONY += all 559ifeq ($(KBUILD_EXTMOD),) 560_all: all 561else 562_all: modules 563endif 564 565# Decide whether to build built-in, modular, or both. 566# Normally, just do built-in. 567 568KBUILD_MODULES := 569KBUILD_BUILTIN := 1 570 571# If we have only "make modules", don't compile built-in objects. 572# When we're building modules with modversions, we need to consider 573# the built-in objects during the descend as well, in order to 574# make sure the checksums are up to date before we record them. 575 576ifeq ($(MAKECMDGOALS),modules) 577 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1) 578endif 579 580# If we have "make <whatever> modules", compile modules 581# in addition to whatever we do anyway. 582# Just "make" or "make all" shall build modules as well 583 584ifneq ($(filter all _all modules,$(MAKECMDGOALS)),) 585 KBUILD_MODULES := 1 586endif 587 588ifeq ($(MAKECMDGOALS),) 589 KBUILD_MODULES := 1 590endif 591 592export KBUILD_MODULES KBUILD_BUILTIN 593 594ifeq ($(KBUILD_EXTMOD),) 595# Objects we will link into vmlinux / subdirs we need to visit 596init-y := init/ 597drivers-y := drivers/ sound/ 598net-y := net/ 599libs-y := lib/ 600core-y := usr/ 601virt-y := virt/ 602endif # KBUILD_EXTMOD 603 604ifeq ($(dot-config),1) 605include include/config/auto.conf 606endif 607 608# The all: target is the default when no target is given on the 609# command line. 610# This allow a user to issue only 'make' to build a kernel including modules 611# Defaults to vmlinux, but the arch makefile usually adds further targets 612all: vmlinux 613 614CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \ 615 $(call cc-option,-fno-tree-loop-im) \ 616 $(call cc-disable-warning,maybe-uninitialized,) 617export CFLAGS_GCOV 618 619# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 620ifdef CONFIG_FUNCTION_TRACER 621 CC_FLAGS_FTRACE := -pg 622endif 623 624# The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default 625# values of the respective KBUILD_* variables 626ARCH_CPPFLAGS := 627ARCH_AFLAGS := 628ARCH_CFLAGS := 629include arch/$(SRCARCH)/Makefile 630 631ifeq ($(dot-config),1) 632ifeq ($(may-sync-config),1) 633# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 634# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 635# because some architectures define CROSS_COMPILE there. 636-include include/config/auto.conf.cmd 637 638$(KCONFIG_CONFIG): 639 @echo >&2 '***' 640 @echo >&2 '*** Configuration file "$@" not found!' 641 @echo >&2 '***' 642 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 643 @echo >&2 '*** "make menuconfig" or "make xconfig").' 644 @echo >&2 '***' 645 @/bin/false 646 647# The actual configuration files used during the build are stored in 648# include/generated/ and include/config/. Update them if .config is newer than 649# include/config/auto.conf (which mirrors .config). 650# 651# This exploits the 'multi-target pattern rule' trick. 652# The syncconfig should be executed only once to make all the targets. 653%/auto.conf %/auto.conf.cmd %/tristate.conf: $(KCONFIG_CONFIG) 654 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 655else 656# External modules and some install targets need include/generated/autoconf.h 657# and include/config/auto.conf but do not care if they are up-to-date. 658# Use auto.conf to trigger the test 659PHONY += include/config/auto.conf 660 661include/config/auto.conf: 662 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 663 echo >&2; \ 664 echo >&2 " ERROR: Kernel configuration is invalid."; \ 665 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 666 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 667 echo >&2 ; \ 668 /bin/false) 669 670endif # may-sync-config 671endif # $(dot-config) 672 673KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,) 674KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) 675KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) 676KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) 677KBUILD_CFLAGS += $(call cc-disable-warning, int-in-bool-context) 678 679ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 680KBUILD_CFLAGS += $(call cc-option,-Oz,-Os) 681else 682KBUILD_CFLAGS += -O2 683endif 684 685ifdef CONFIG_CC_DISABLE_WARN_MAYBE_UNINITIALIZED 686KBUILD_CFLAGS += -Wno-maybe-uninitialized 687endif 688 689# Tell gcc to never replace conditional load with a non-conditional one 690KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 691 692include scripts/Makefile.kcov 693include scripts/Makefile.gcc-plugins 694 695ifdef CONFIG_READABLE_ASM 696# Disable optimizations that make assembler listings hard to read. 697# reorder blocks reorders the control in the function 698# ipa clone creates specialized cloned functions 699# partial inlining inlines only parts of functions 700KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \ 701 $(call cc-option,-fno-ipa-cp-clone,) \ 702 $(call cc-option,-fno-partial-inlining) 703endif 704 705ifneq ($(CONFIG_FRAME_WARN),0) 706KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN}) 707endif 708 709stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector 710stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 711stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 712 713KBUILD_CFLAGS += $(stackp-flags-y) 714 715ifdef CONFIG_CC_IS_CLANG 716KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,) 717KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier) 718KBUILD_CFLAGS += $(call cc-disable-warning, gnu) 719KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) 720# Quiet clang warning: comparison of unsigned expression < 0 is always false 721KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare) 722# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the 723# source of a reference will be _MergedGlobals and not on of the whitelisted names. 724# See modpost pattern 2 725KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,) 726KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior) 727else 728 729# These warnings generated too much noise in a regular build. 730# Use make W=1 to enable them (see scripts/Makefile.extrawarn) 731KBUILD_CFLAGS += -Wno-unused-but-set-variable 732endif 733 734KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) 735ifdef CONFIG_FRAME_POINTER 736KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 737else 738# Some targets (ARM with Thumb2, for example), can't be built with frame 739# pointers. For those, we don't have FUNCTION_TRACER automatically 740# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 741# incompatible with -fomit-frame-pointer with current GCC, so we don't use 742# -fomit-frame-pointer with FUNCTION_TRACER. 743ifndef CONFIG_FUNCTION_TRACER 744KBUILD_CFLAGS += -fomit-frame-pointer 745endif 746endif 747 748DEBUG_CFLAGS := $(call cc-option, -fno-var-tracking-assignments) 749 750ifdef CONFIG_DEBUG_INFO 751ifdef CONFIG_DEBUG_INFO_SPLIT 752DEBUG_CFLAGS += -gsplit-dwarf 753else 754DEBUG_CFLAGS += -g 755endif 756KBUILD_AFLAGS += -Wa,-gdwarf-2 757endif 758ifdef CONFIG_DEBUG_INFO_DWARF4 759DEBUG_CFLAGS += -gdwarf-4 760endif 761 762ifdef CONFIG_DEBUG_INFO_REDUCED 763DEBUG_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \ 764 $(call cc-option,-fno-var-tracking) 765endif 766 767KBUILD_CFLAGS += $(DEBUG_CFLAGS) 768export DEBUG_CFLAGS 769 770ifdef CONFIG_FUNCTION_TRACER 771ifdef CONFIG_FTRACE_MCOUNT_RECORD 772 # gcc 5 supports generating the mcount tables directly 773 ifeq ($(call cc-option-yn,-mrecord-mcount),y) 774 CC_FLAGS_FTRACE += -mrecord-mcount 775 export CC_USING_RECORD_MCOUNT := 1 776 endif 777 ifdef CONFIG_HAVE_NOP_MCOUNT 778 ifeq ($(call cc-option-yn, -mnop-mcount),y) 779 CC_FLAGS_FTRACE += -mnop-mcount 780 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 781 endif 782 endif 783endif 784ifdef CONFIG_HAVE_FENTRY 785 ifeq ($(call cc-option-yn, -mfentry),y) 786 CC_FLAGS_FTRACE += -mfentry 787 CC_FLAGS_USING += -DCC_USING_FENTRY 788 endif 789endif 790export CC_FLAGS_FTRACE 791KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 792KBUILD_AFLAGS += $(CC_FLAGS_USING) 793ifdef CONFIG_DYNAMIC_FTRACE 794 ifdef CONFIG_HAVE_C_RECORDMCOUNT 795 BUILD_C_RECORDMCOUNT := y 796 export BUILD_C_RECORDMCOUNT 797 endif 798endif 799endif 800 801# We trigger additional mismatches with less inlining 802ifdef CONFIG_DEBUG_SECTION_MISMATCH 803KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) 804endif 805 806ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 807KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 808LDFLAGS_vmlinux += --gc-sections 809endif 810 811# arch Makefile may override CC so keep this after arch Makefile is included 812NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) 813 814# warn about C99 declaration after statement 815KBUILD_CFLAGS += -Wdeclaration-after-statement 816 817# Variable Length Arrays (VLAs) should not be used anywhere in the kernel 818KBUILD_CFLAGS += $(call cc-option,-Wvla) 819 820# disable pointer signed / unsigned warnings in gcc 4.0 821KBUILD_CFLAGS += -Wno-pointer-sign 822 823# disable stringop warnings in gcc 8+ 824KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation) 825 826# disable invalid "can't wrap" optimizations for signed / pointers 827KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow) 828 829# clang sets -fmerge-all-constants by default as optimization, but this 830# is non-conforming behavior for C and in fact breaks the kernel, so we 831# need to disable it here generally. 832KBUILD_CFLAGS += $(call cc-option,-fno-merge-all-constants) 833 834# for gcc -fno-merge-all-constants disables everything, but it is fine 835# to have actual conforming behavior enabled. 836KBUILD_CFLAGS += $(call cc-option,-fmerge-constants) 837 838# Make sure -fstack-check isn't enabled (like gentoo apparently did) 839KBUILD_CFLAGS += $(call cc-option,-fno-stack-check,) 840 841# conserve stack if available 842KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) 843 844# Prohibit date/time macros, which would make the build non-deterministic 845KBUILD_CFLAGS += $(call cc-option,-Werror=date-time) 846 847# enforce correct pointer usage 848KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 849 850# Require designated initializers for all marked structures 851KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) 852 853# change __FILE__ to the relative path from the srctree 854KBUILD_CFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 855 856# use the deterministic mode of AR if available 857KBUILD_ARFLAGS := $(call ar-option,D) 858 859include scripts/Makefile.kasan 860include scripts/Makefile.extrawarn 861include scripts/Makefile.ubsan 862 863# Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the 864# last assignments 865KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS) 866KBUILD_AFLAGS += $(ARCH_AFLAGS) $(KAFLAGS) 867KBUILD_CFLAGS += $(ARCH_CFLAGS) $(KCFLAGS) 868 869# Use --build-id when available. 870LDFLAGS_BUILD_ID := $(call ld-option, --build-id) 871KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID) 872LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID) 873 874ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 875LDFLAGS_vmlinux += $(call ld-option, -X,) 876endif 877 878# insure the checker run with the right endianness 879CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 880 881# the checker needs the correct machine size 882CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 883 884# Default kernel image to build when no specific target is given. 885# KBUILD_IMAGE may be overruled on the command line or 886# set in the environment 887# Also any assignments in arch/$(ARCH)/Makefile take precedence over 888# this default value 889export KBUILD_IMAGE ?= vmlinux 890 891# 892# INSTALL_PATH specifies where to place the updated kernel and system map 893# images. Default is /boot, but you can set it to other values 894export INSTALL_PATH ?= /boot 895 896# 897# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 898# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 899# an argument if needed. Otherwise it defaults to the kernel install path 900# 901export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 902 903# 904# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 905# relocations required by build roots. This is not defined in the 906# makefile but the argument can be passed to make if needed. 907# 908 909MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 910export MODLIB 911 912# 913# INSTALL_MOD_STRIP, if defined, will cause modules to be 914# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then 915# the default option --strip-debug will be used. Otherwise, 916# INSTALL_MOD_STRIP value will be used as the options to the strip command. 917 918ifdef INSTALL_MOD_STRIP 919ifeq ($(INSTALL_MOD_STRIP),1) 920mod_strip_cmd = $(STRIP) --strip-debug 921else 922mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP) 923endif # INSTALL_MOD_STRIP=1 924else 925mod_strip_cmd = true 926endif # INSTALL_MOD_STRIP 927export mod_strip_cmd 928 929# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed 930# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP 931# or CONFIG_MODULE_COMPRESS_XZ. 932 933mod_compress_cmd = true 934ifdef CONFIG_MODULE_COMPRESS 935 ifdef CONFIG_MODULE_COMPRESS_GZIP 936 mod_compress_cmd = gzip -n -f 937 endif # CONFIG_MODULE_COMPRESS_GZIP 938 ifdef CONFIG_MODULE_COMPRESS_XZ 939 mod_compress_cmd = xz -f 940 endif # CONFIG_MODULE_COMPRESS_XZ 941endif # CONFIG_MODULE_COMPRESS 942export mod_compress_cmd 943 944ifdef CONFIG_MODULE_SIG_ALL 945$(eval $(call config_filename,MODULE_SIG_KEY)) 946 947mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509 948else 949mod_sign_cmd = true 950endif 951export mod_sign_cmd 952 953ifdef CONFIG_STACK_VALIDATION 954 has_libelf := $(call try-run,\ 955 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0) 956 ifeq ($(has_libelf),1) 957 objtool_target := tools/objtool FORCE 958 else 959 SKIP_STACK_VALIDATION := 1 960 export SKIP_STACK_VALIDATION 961 endif 962endif 963 964PHONY += prepare0 965 966ifeq ($(KBUILD_EXTMOD),) 967core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/ 968 969vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \ 970 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 971 $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y))) 972 973vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \ 974 $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-)))) 975 976init-y := $(patsubst %/, %/built-in.a, $(init-y)) 977core-y := $(patsubst %/, %/built-in.a, $(core-y)) 978drivers-y := $(patsubst %/, %/built-in.a, $(drivers-y)) 979net-y := $(patsubst %/, %/built-in.a, $(net-y)) 980libs-y1 := $(patsubst %/, %/lib.a, $(libs-y)) 981libs-y2 := $(patsubst %/, %/built-in.a, $(filter-out %.a, $(libs-y))) 982virt-y := $(patsubst %/, %/built-in.a, $(virt-y)) 983 984# Externally visible symbols (used by link-vmlinux.sh) 985export KBUILD_VMLINUX_OBJS := $(head-y) $(init-y) $(core-y) $(libs-y2) \ 986 $(drivers-y) $(net-y) $(virt-y) 987export KBUILD_VMLINUX_LIBS := $(libs-y1) 988export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 989export LDFLAGS_vmlinux 990# used by scripts/package/Makefile 991export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools) 992 993vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS) 994 995# Recurse until adjust_autoksyms.sh is satisfied 996PHONY += autoksyms_recursive 997autoksyms_recursive: $(vmlinux-deps) 998ifdef CONFIG_TRIM_UNUSED_KSYMS 999 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ 1000 "$(MAKE) -f $(srctree)/Makefile vmlinux" 1001endif 1002 1003# For the kernel to actually contain only the needed exported symbols, 1004# we have to build modules as well to determine what those symbols are. 1005# (this can be evaluated only once include/config/auto.conf has been included) 1006ifdef CONFIG_TRIM_UNUSED_KSYMS 1007 KBUILD_MODULES := 1 1008endif 1009 1010autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h) 1011 1012$(autoksyms_h): 1013 $(Q)mkdir -p $(dir $@) 1014 $(Q)touch $@ 1015 1016ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink) 1017 1018# Final link of vmlinux with optional arch pass after final link 1019cmd_link-vmlinux = \ 1020 $(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ; \ 1021 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) 1022 1023vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE 1024 +$(call if_changed,link-vmlinux) 1025 1026targets := vmlinux 1027 1028# Build samples along the rest of the kernel. This needs headers_install. 1029ifdef CONFIG_SAMPLES 1030vmlinux-dirs += samples 1031samples: headers_install 1032endif 1033 1034# The actual objects are generated when descending, 1035# make sure no implicit rule kicks in 1036$(sort $(vmlinux-deps)): $(vmlinux-dirs) ; 1037 1038# Handle descending into subdirectories listed in $(vmlinux-dirs) 1039# Preset locale variables to speed up the build process. Limit locale 1040# tweaks to this spot to avoid wrong language settings when running 1041# make menuconfig etc. 1042# Error messages still appears in the original language 1043 1044PHONY += $(vmlinux-dirs) 1045$(vmlinux-dirs): prepare 1046 $(Q)$(MAKE) $(build)=$@ need-builtin=1 1047 1048filechk_kernel.release = \ 1049 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1050 1051# Store (new) KERNELRELEASE string in include/config/kernel.release 1052include/config/kernel.release: $(srctree)/Makefile FORCE 1053 $(call filechk,kernel.release) 1054 1055# Additional helpers built in scripts/ 1056# Carefully list dependencies so we do not try to build scripts twice 1057# in parallel 1058PHONY += scripts 1059scripts: scripts_basic scripts_dtc 1060 $(Q)$(MAKE) $(build)=$(@) 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 1068PHONY += prepare archprepare prepare1 prepare3 1069 1070# prepare3 is used to check if we are building in a separate output directory, 1071# and if so do: 1072# 1) Check that make has not been executed in the kernel src $(srctree) 1073prepare3: include/config/kernel.release 1074ifneq ($(KBUILD_SRC),) 1075 @$(kecho) ' Using $(srctree) as source for kernel' 1076 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \ 1077 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \ 1078 echo >&2 " in the '$(srctree)' directory.";\ 1079 /bin/false; \ 1080 fi; 1081endif 1082 1083prepare1: prepare3 outputmakefile asm-generic $(version_h) $(autoksyms_h) \ 1084 include/generated/utsrelease.h 1085 $(cmd_crmodverdir) 1086 1087archprepare: archheaders archscripts prepare1 scripts 1088 1089prepare0: archprepare 1090 $(Q)$(MAKE) $(build)=scripts/mod 1091 $(Q)$(MAKE) $(build)=. 1092 1093# All the preparing.. 1094prepare: prepare0 prepare-objtool 1095 1096# Support for using generic headers in asm-generic 1097asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj 1098 1099PHONY += asm-generic uapi-asm-generic 1100asm-generic: uapi-asm-generic 1101 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1102 generic=include/asm-generic 1103uapi-asm-generic: 1104 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1105 generic=include/uapi/asm-generic 1106 1107PHONY += prepare-objtool 1108prepare-objtool: $(objtool_target) 1109ifeq ($(SKIP_STACK_VALIDATION),1) 1110ifdef CONFIG_UNWINDER_ORC 1111 @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1112 @false 1113else 1114 @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1115endif 1116endif 1117 1118# Generate some files 1119# --------------------------------------------------------------------------- 1120 1121# KERNELRELEASE can change from a few different places, meaning version.h 1122# needs to be updated, so this check is forced on all builds 1123 1124uts_len := 64 1125define filechk_utsrelease.h 1126 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1127 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1128 exit 1; \ 1129 fi; \ 1130 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1131endef 1132 1133define filechk_version.h 1134 echo \#define LINUX_VERSION_CODE $(shell \ 1135 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \ 1136 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))' 1137endef 1138 1139$(version_h): FORCE 1140 $(call filechk,version.h) 1141 $(Q)rm -f $(old_version_h) 1142 1143include/generated/utsrelease.h: include/config/kernel.release FORCE 1144 $(call filechk,utsrelease.h) 1145 1146PHONY += headerdep 1147headerdep: 1148 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1149 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1150 1151# --------------------------------------------------------------------------- 1152# Kernel headers 1153 1154#Default location for installed headers 1155export INSTALL_HDR_PATH = $(objtree)/usr 1156 1157# If we do an all arch process set dst to include/arch-$(SRCARCH) 1158hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(SRCARCH), dst=include) 1159 1160PHONY += archheaders archscripts 1161 1162PHONY += __headers 1163__headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts 1164 $(Q)$(MAKE) $(build)=scripts build_unifdef 1165 1166PHONY += headers_install_all 1167headers_install_all: 1168 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install 1169 1170PHONY += headers_install 1171headers_install: __headers 1172 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \ 1173 $(error Headers not exportable for the $(SRCARCH) architecture)) 1174 $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include 1175 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) 1176 1177PHONY += headers_check_all 1178headers_check_all: headers_install_all 1179 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check 1180 1181PHONY += headers_check 1182headers_check: headers_install 1183 $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1 1184 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) HDRCHECK=1 1185 1186ifdef CONFIG_HEADERS_CHECK 1187all: headers_check 1188endif 1189 1190# --------------------------------------------------------------------------- 1191# Kernel selftest 1192 1193PHONY += kselftest 1194kselftest: 1195 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1196 1197PHONY += kselftest-clean 1198kselftest-clean: 1199 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean 1200 1201PHONY += kselftest-merge 1202kselftest-merge: 1203 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1204 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \ 1205 -m $(objtree)/.config \ 1206 $(srctree)/tools/testing/selftests/*/config 1207 +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1208 1209# --------------------------------------------------------------------------- 1210# Devicetree files 1211 1212ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1213dtstree := arch/$(SRCARCH)/boot/dts 1214endif 1215 1216ifneq ($(dtstree),) 1217 1218%.dtb: prepare3 scripts_dtc 1219 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1220 1221PHONY += dtbs dtbs_install dt_binding_check 1222dtbs dtbs_check: prepare3 scripts_dtc 1223 $(Q)$(MAKE) $(build)=$(dtstree) 1224 1225dtbs_check: export CHECK_DTBS=1 1226dtbs_check: dt_binding_check 1227 1228dtbs_install: 1229 $(Q)$(MAKE) $(dtbinst)=$(dtstree) 1230 1231ifdef CONFIG_OF_EARLY_FLATTREE 1232all: dtbs 1233endif 1234 1235endif 1236 1237PHONY += scripts_dtc 1238scripts_dtc: scripts_basic 1239 $(Q)$(MAKE) $(build)=scripts/dtc 1240 1241dt_binding_check: scripts_dtc 1242 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings 1243 1244# --------------------------------------------------------------------------- 1245# Modules 1246 1247ifdef CONFIG_MODULES 1248 1249# By default, build modules as well 1250 1251all: modules 1252 1253# Build modules 1254# 1255# A module can be listed more than once in obj-m resulting in 1256# duplicate lines in modules.order files. Those are removed 1257# using awk while concatenating to the final file. 1258 1259PHONY += modules 1260modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin 1261 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order 1262 @$(kecho) ' Building modules, stage 2.'; 1263 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1264 1265modules.builtin: $(vmlinux-dirs:%=%/modules.builtin) 1266 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin 1267 1268%/modules.builtin: include/config/auto.conf include/config/tristate.conf 1269 $(Q)$(MAKE) $(modbuiltin)=$* 1270 1271 1272# Target to prepare building external modules 1273PHONY += modules_prepare 1274modules_prepare: prepare 1275 1276# Target to install modules 1277PHONY += modules_install 1278modules_install: _modinst_ _modinst_post 1279 1280PHONY += _modinst_ 1281_modinst_: 1282 @rm -rf $(MODLIB)/kernel 1283 @rm -f $(MODLIB)/source 1284 @mkdir -p $(MODLIB)/kernel 1285 @ln -s $(abspath $(srctree)) $(MODLIB)/source 1286 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1287 rm -f $(MODLIB)/build ; \ 1288 ln -s $(CURDIR) $(MODLIB)/build ; \ 1289 fi 1290 @cp -f $(objtree)/modules.order $(MODLIB)/ 1291 @cp -f $(objtree)/modules.builtin $(MODLIB)/ 1292 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1293 1294# This depmod is only for convenience to give the initial 1295# boot a modules.dep even before / is mounted read-write. However the 1296# boot script depmod is the master version. 1297PHONY += _modinst_post 1298_modinst_post: _modinst_ 1299 $(call cmd,depmod) 1300 1301ifeq ($(CONFIG_MODULE_SIG), y) 1302PHONY += modules_sign 1303modules_sign: 1304 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign 1305endif 1306 1307else # CONFIG_MODULES 1308 1309# Modules not configured 1310# --------------------------------------------------------------------------- 1311 1312PHONY += modules modules_install 1313modules modules_install: 1314 @echo >&2 1315 @echo >&2 "The present kernel configuration has modules disabled." 1316 @echo >&2 "Type 'make config' and enable loadable module support." 1317 @echo >&2 "Then build a kernel with module support enabled." 1318 @echo >&2 1319 @exit 1 1320 1321endif # CONFIG_MODULES 1322 1323### 1324# Cleaning is done on three levels. 1325# make clean Delete most generated files 1326# Leave enough to build external modules 1327# make mrproper Delete the current configuration, and all generated files 1328# make distclean Remove editor backup files, patch leftover files and the like 1329 1330# Directories & files removed with 'make clean' 1331CLEAN_DIRS += $(MODVERDIR) include/ksym 1332 1333# Directories & files removed with 'make mrproper' 1334MRPROPER_DIRS += include/config usr/include include/generated \ 1335 arch/*/include/generated .tmp_objdiff 1336MRPROPER_FILES += .config .config.old .version \ 1337 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \ 1338 signing_key.pem signing_key.priv signing_key.x509 \ 1339 x509.genkey extra_certificates signing_key.x509.keyid \ 1340 signing_key.x509.signer vmlinux-gdb.py 1341 1342# clean - Delete most, but leave enough to build external modules 1343# 1344clean: rm-dirs := $(CLEAN_DIRS) 1345clean: rm-files := $(CLEAN_FILES) 1346clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples) 1347 1348PHONY += $(clean-dirs) clean archclean vmlinuxclean 1349$(clean-dirs): 1350 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1351 1352vmlinuxclean: 1353 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1354 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1355 1356clean: archclean vmlinuxclean 1357 1358# mrproper - Delete all generated files, including .config 1359# 1360mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS)) 1361mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1362mrproper-dirs := $(addprefix _mrproper_,scripts) 1363 1364PHONY += $(mrproper-dirs) mrproper 1365$(mrproper-dirs): 1366 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1367 1368mrproper: clean $(mrproper-dirs) 1369 $(call cmd,rmdirs) 1370 $(call cmd,rmfiles) 1371 1372# distclean 1373# 1374PHONY += distclean 1375 1376distclean: mrproper 1377 @find $(srctree) $(RCS_FIND_IGNORE) \ 1378 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1379 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1380 -o -name 'core' \) \ 1381 -type f -print | xargs rm -f 1382 1383 1384# Packaging of the kernel to various formats 1385# --------------------------------------------------------------------------- 1386package-dir := scripts/package 1387 1388%src-pkg: FORCE 1389 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1390%pkg: include/config/kernel.release FORCE 1391 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1392 1393 1394# Brief documentation of the typical targets used 1395# --------------------------------------------------------------------------- 1396 1397boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1398boards := $(sort $(notdir $(boards))) 1399board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1400board-dirs := $(sort $(notdir $(board-dirs:/=))) 1401 1402PHONY += help 1403help: 1404 @echo 'Cleaning targets:' 1405 @echo ' clean - Remove most generated files but keep the config and' 1406 @echo ' enough build support to build external modules' 1407 @echo ' mrproper - Remove all generated files + config + various backup files' 1408 @echo ' distclean - mrproper + remove editor backup and patch files' 1409 @echo '' 1410 @echo 'Configuration targets:' 1411 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1412 @echo '' 1413 @echo 'Other generic targets:' 1414 @echo ' all - Build all targets marked with [*]' 1415 @echo '* vmlinux - Build the bare kernel' 1416 @echo '* modules - Build all modules' 1417 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1418 @echo ' dir/ - Build all files in dir and below' 1419 @echo ' dir/file.[ois] - Build specified target only' 1420 @echo ' dir/file.ll - Build the LLVM assembly file' 1421 @echo ' (requires compiler support for LLVM assembly generation)' 1422 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1423 @echo ' (requires a recent binutils and recent build (System.map))' 1424 @echo ' dir/file.ko - Build module including final link' 1425 @echo ' modules_prepare - Set up for building external modules' 1426 @echo ' tags/TAGS - Generate tags file for editors' 1427 @echo ' cscope - Generate cscope index' 1428 @echo ' gtags - Generate GNU GLOBAL index' 1429 @echo ' kernelrelease - Output the release version string (use with make -s)' 1430 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1431 @echo ' image_name - Output the image name (use with make -s)' 1432 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1433 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1434 echo '' 1435 @echo 'Static analysers:' 1436 @echo ' checkstack - Generate a list of stack hogs' 1437 @echo ' namespacecheck - Name space analysis on compiled kernel' 1438 @echo ' versioncheck - Sanity check on version.h usage' 1439 @echo ' includecheck - Check for duplicate included header files' 1440 @echo ' export_report - List the usages of all exported symbols' 1441 @echo ' headers_check - Sanity check on exported headers' 1442 @echo ' headerdep - Detect inclusion cycles in headers' 1443 @echo ' coccicheck - Check with Coccinelle' 1444 @echo '' 1445 @echo 'Kernel selftest:' 1446 @echo ' kselftest - Build and run kernel selftest (run as root)' 1447 @echo ' Build, install, and boot kernel before' 1448 @echo ' running kselftest on it' 1449 @echo ' kselftest-clean - Remove all generated kselftest files' 1450 @echo ' kselftest-merge - Merge all the config dependencies of kselftest to existing' 1451 @echo ' .config.' 1452 @echo '' 1453 @$(if $(dtstree), \ 1454 echo 'Devicetree:'; \ 1455 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1456 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1457 echo '') 1458 1459 @echo 'Userspace tools targets:' 1460 @echo ' use "make tools/help"' 1461 @echo ' or "cd tools; make help"' 1462 @echo '' 1463 @echo 'Kernel packaging:' 1464 @$(MAKE) $(build)=$(package-dir) help 1465 @echo '' 1466 @echo 'Documentation targets:' 1467 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1468 @echo '' 1469 @echo 'Architecture specific targets ($(SRCARCH)):' 1470 @$(if $(archhelp),$(archhelp),\ 1471 echo ' No architecture specific help defined for $(SRCARCH)') 1472 @echo '' 1473 @$(if $(boards), \ 1474 $(foreach b, $(boards), \ 1475 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1476 echo '') 1477 @$(if $(board-dirs), \ 1478 $(foreach b, $(board-dirs), \ 1479 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1480 printf " %-16s - Show all of the above\\n" help-boards; \ 1481 echo '') 1482 1483 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1484 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1485 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1486 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK (sparse by default)' 1487 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1488 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1489 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where' 1490 @echo ' 1: warnings which may be relevant and do not occur too often' 1491 @echo ' 2: warnings which occur quite often but may still be relevant' 1492 @echo ' 3: more obscure warnings, can most likely be ignored' 1493 @echo ' Multiple levels can be combined with W=12 or W=123' 1494 @echo '' 1495 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1496 @echo 'For further info see the ./README file' 1497 1498 1499help-board-dirs := $(addprefix help-,$(board-dirs)) 1500 1501help-boards: $(help-board-dirs) 1502 1503boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1504 1505$(help-board-dirs): help-%: 1506 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1507 @$(if $(boards-per-dir), \ 1508 $(foreach b, $(boards-per-dir), \ 1509 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1510 echo '') 1511 1512 1513# Documentation targets 1514# --------------------------------------------------------------------------- 1515DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1516 linkcheckdocs dochelp refcheckdocs 1517PHONY += $(DOC_TARGETS) 1518$(DOC_TARGETS): scripts_basic FORCE 1519 $(Q)$(MAKE) $(build)=Documentation $@ 1520 1521# Misc 1522# --------------------------------------------------------------------------- 1523 1524PHONY += scripts_gdb 1525scripts_gdb: prepare 1526 $(Q)$(MAKE) $(build)=scripts/gdb 1527 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1528 1529ifdef CONFIG_GDB_SCRIPTS 1530all: scripts_gdb 1531endif 1532 1533else # KBUILD_EXTMOD 1534 1535### 1536# External module support. 1537# When building external modules the kernel used as basis is considered 1538# read-only, and no consistency checks are made and the make 1539# system is not used on the basis kernel. If updates are required 1540# in the basis kernel ordinary make commands (without M=...) must 1541# be used. 1542# 1543# The following are the only valid targets when building external 1544# modules. 1545# make M=dir clean Delete all automatically generated files 1546# make M=dir modules Make all modules in specified dir 1547# make M=dir Same as 'make M=dir modules' 1548# make M=dir modules_install 1549# Install the modules built in the module directory 1550# Assumes install directory is already created 1551 1552# We are always building modules 1553KBUILD_MODULES := 1 1554 1555PHONY += $(objtree)/Module.symvers 1556$(objtree)/Module.symvers: 1557 @test -e $(objtree)/Module.symvers || ( \ 1558 echo; \ 1559 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \ 1560 echo " is missing; modules will have no dependencies and modversions."; \ 1561 echo ) 1562 1563module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD)) 1564PHONY += $(module-dirs) modules 1565$(module-dirs): prepare $(objtree)/Module.symvers 1566 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@) 1567 1568modules: $(module-dirs) 1569 @$(kecho) ' Building modules, stage 2.'; 1570 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1571 1572PHONY += modules_install 1573modules_install: _emodinst_ _emodinst_post 1574 1575install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra) 1576PHONY += _emodinst_ 1577_emodinst_: 1578 $(Q)mkdir -p $(MODLIB)/$(install-dir) 1579 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1580 1581PHONY += _emodinst_post 1582_emodinst_post: _emodinst_ 1583 $(call cmd,depmod) 1584 1585clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD)) 1586 1587PHONY += $(clean-dirs) clean 1588$(clean-dirs): 1589 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1590 1591clean: rm-dirs := $(MODVERDIR) 1592clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers 1593 1594PHONY += help 1595help: 1596 @echo ' Building external modules.' 1597 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1598 @echo '' 1599 @echo ' modules - default target, build the module(s)' 1600 @echo ' modules_install - install the module' 1601 @echo ' clean - remove generated files in module directory only' 1602 @echo '' 1603 1604PHONY += prepare 1605prepare: 1606 $(cmd_crmodverdir) 1607endif # KBUILD_EXTMOD 1608 1609clean: $(clean-dirs) 1610 $(call cmd,rmdirs) 1611 $(call cmd,rmfiles) 1612 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1613 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \ 1614 -o -name '*.ko.*' \ 1615 -o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \ 1616 -o -name '*.dwo' -o -name '*.lst' \ 1617 -o -name '*.su' \ 1618 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1619 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 1620 -o -name '*.asn1.[ch]' \ 1621 -o -name '*.symtypes' -o -name 'modules.order' \ 1622 -o -name modules.builtin -o -name '.tmp_*.o.*' \ 1623 -o -name '*.c.[012]*.*' \ 1624 -o -name '*.ll' \ 1625 -o -name '*.gcno' \) -type f -print | xargs rm -f 1626 1627# Generate tags for editors 1628# --------------------------------------------------------------------------- 1629quiet_cmd_tags = GEN $@ 1630 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@ 1631 1632tags TAGS cscope gtags: FORCE 1633 $(call cmd,tags) 1634 1635# Scripts to check various things for consistency 1636# --------------------------------------------------------------------------- 1637 1638PHONY += includecheck versioncheck coccicheck namespacecheck export_report 1639 1640includecheck: 1641 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1642 -name '*.[hcS]' -type f -print | sort \ 1643 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1644 1645versioncheck: 1646 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1647 -name '*.[hcS]' -type f -print | sort \ 1648 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1649 1650coccicheck: 1651 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@ 1652 1653namespacecheck: 1654 $(PERL) $(srctree)/scripts/namespace.pl 1655 1656export_report: 1657 $(PERL) $(srctree)/scripts/export_report.pl 1658 1659PHONY += checkstack kernelrelease kernelversion image_name 1660 1661# UML needs a little special treatment here. It wants to use the host 1662# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1663# else wants $(ARCH), including people doing cross-builds, which means 1664# that $(SUBARCH) doesn't work here. 1665ifeq ($(ARCH), um) 1666CHECKSTACK_ARCH := $(SUBARCH) 1667else 1668CHECKSTACK_ARCH := $(ARCH) 1669endif 1670checkstack: 1671 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1672 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1673 1674kernelrelease: 1675 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1676 1677kernelversion: 1678 @echo $(KERNELVERSION) 1679 1680image_name: 1681 @echo $(KBUILD_IMAGE) 1682 1683# Clear a bunch of variables before executing the submake 1684 1685ifeq ($(quiet),silent_) 1686tools_silent=s 1687endif 1688 1689tools/: FORCE 1690 $(Q)mkdir -p $(objtree)/tools 1691 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ 1692 1693tools/%: FORCE 1694 $(Q)mkdir -p $(objtree)/tools 1695 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $* 1696 1697# Single targets 1698# --------------------------------------------------------------------------- 1699# Single targets are compatible with: 1700# - build with mixed source and output 1701# - build with separate output dir 'make O=...' 1702# - external modules 1703# 1704# target-dir => where to store outputfile 1705# build-dir => directory in kernel source tree to use 1706 1707build-target = $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD)/)$@ 1708build-dir = $(patsubst %/,%,$(dir $(build-target))) 1709 1710%.i: prepare FORCE 1711 $(Q)$(MAKE) $(build)=$(build-dir) $(build-target) 1712%.ll: prepare FORCE 1713 $(Q)$(MAKE) $(build)=$(build-dir) $(build-target) 1714%.lst: prepare FORCE 1715 $(Q)$(MAKE) $(build)=$(build-dir) $(build-target) 1716%.o: prepare FORCE 1717 $(Q)$(MAKE) $(build)=$(build-dir) $(build-target) 1718%.s: prepare FORCE 1719 $(Q)$(MAKE) $(build)=$(build-dir) $(build-target) 1720%.symtypes: prepare FORCE 1721 $(Q)$(MAKE) $(build)=$(build-dir) $(build-target) 1722%.ko: %.o 1723 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1724 1725# Modules 1726PHONY += / 1727/: ./ 1728 1729# Make sure the latest headers are built for Documentation 1730Documentation/ samples/: headers_install 1731%/: prepare FORCE 1732 $(Q)$(MAKE) KBUILD_MODULES=1 $(build)=$(build-dir) 1733 1734# FIXME Should go into a make.lib or something 1735# =========================================================================== 1736 1737quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs))) 1738 cmd_rmdirs = rm -rf $(rm-dirs) 1739 1740quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1741 cmd_rmfiles = rm -f $(rm-files) 1742 1743# Run depmod only if we have System.map and depmod is executable 1744quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) 1745 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1746 $(KERNELRELEASE) 1747 1748# Create temporary dir for module support files 1749# clean it up only when building all modules 1750cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \ 1751 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*) 1752 1753# read saved command lines for existing targets 1754existing-targets := $(wildcard $(sort $(targets))) 1755 1756-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 1757 1758endif # ifeq ($(config-targets),1) 1759endif # ifeq ($(mixed-targets),1) 1760endif # sub-make-done 1761 1762PHONY += FORCE 1763FORCE: 1764 1765# Declare the contents of the PHONY variable as phony. We keep that 1766# information in a variable so we can use it in if_changed and friends. 1767.PHONY: $(PHONY) 1768