1# SPDX-License-Identifier: GPL-2.0 2VERSION = 5 3PATCHLEVEL = 3 4SUBLEVEL = 0 5EXTRAVERSION = -rc6 6NAME = Bobtail Squid 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 34ifneq ($(sub_make_done),1) 35 36# Do not use make's built-in rules and variables 37# (this increases performance and avoids hard-to-debug behaviour) 38MAKEFLAGS += -rR 39 40# Avoid funny character set dependencies 41unexport LC_ALL 42LC_COLLATE=C 43LC_NUMERIC=C 44export LC_COLLATE LC_NUMERIC 45 46# Avoid interference with shell env settings 47unexport GREP_OPTIONS 48 49# Beautify output 50# --------------------------------------------------------------------------- 51# 52# Normally, we echo the whole command before executing it. By making 53# that echo $($(quiet)$(cmd)), we now have the possibility to set 54# $(quiet) to choose other forms of output instead, e.g. 55# 56# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@ 57# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< 58# 59# If $(quiet) is empty, the whole command will be printed. 60# If it is set to "quiet_", only the short version will be printed. 61# If it is set to "silent_", nothing will be printed at all, since 62# the variable $(silent_cmd_cc_o_c) doesn't exist. 63# 64# A simple variant is to prefix commands with $(Q) - that's useful 65# for commands that shall be hidden in non-verbose mode. 66# 67# $(Q)ln $@ :< 68# 69# If KBUILD_VERBOSE equals 0 then the above command will be hidden. 70# If KBUILD_VERBOSE equals 1 then the above command is displayed. 71# 72# To put more focus on warnings, be less verbose as default 73# Use 'make V=1' to see the full commands 74 75ifeq ("$(origin V)", "command line") 76 KBUILD_VERBOSE = $(V) 77endif 78ifndef KBUILD_VERBOSE 79 KBUILD_VERBOSE = 0 80endif 81 82ifeq ($(KBUILD_VERBOSE),1) 83 quiet = 84 Q = 85else 86 quiet=quiet_ 87 Q = @ 88endif 89 90# If the user is running make -s (silent mode), suppress echoing of 91# commands 92 93ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),) 94 quiet=silent_ 95endif 96 97export quiet Q KBUILD_VERBOSE 98 99# Kbuild will save output files in the current working directory. 100# This does not need to match to the root of the kernel source tree. 101# 102# For example, you can do this: 103# 104# cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile 105# 106# If you want to save output files in a different location, there are 107# two syntaxes to specify it. 108# 109# 1) O= 110# Use "make O=dir/to/store/output/files/" 111# 112# 2) Set KBUILD_OUTPUT 113# Set the environment variable KBUILD_OUTPUT to point to the output directory. 114# export KBUILD_OUTPUT=dir/to/store/output/files/; make 115# 116# The O= assignment takes precedence over the KBUILD_OUTPUT environment 117# variable. 118 119# Do we want to change the working directory? 120ifeq ("$(origin O)", "command line") 121 KBUILD_OUTPUT := $(O) 122endif 123 124ifneq ($(KBUILD_OUTPUT),) 125# Make's built-in functions such as $(abspath ...), $(realpath ...) cannot 126# expand a shell special character '~'. We use a somewhat tedious way here. 127abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd) 128$(if $(abs_objtree),, \ 129 $(error failed to create output directory "$(KBUILD_OUTPUT)")) 130 131# $(realpath ...) resolves symlinks 132abs_objtree := $(realpath $(abs_objtree)) 133else 134abs_objtree := $(CURDIR) 135endif # ifneq ($(KBUILD_OUTPUT),) 136 137ifeq ($(abs_objtree),$(CURDIR)) 138# Suppress "Entering directory ..." unless we are changing the work directory. 139MAKEFLAGS += --no-print-directory 140else 141need-sub-make := 1 142endif 143 144abs_srctree := $(realpath $(dir $(lastword $(MAKEFILE_LIST)))) 145 146ifneq ($(words $(subst :, ,$(abs_srctree))), 1) 147$(error source directory cannot contain spaces or colons) 148endif 149 150ifneq ($(abs_srctree),$(abs_objtree)) 151# Look for make include files relative to root of kernel src 152# 153# This does not become effective immediately because MAKEFLAGS is re-parsed 154# once after the Makefile is read. We need to invoke sub-make. 155MAKEFLAGS += --include-dir=$(abs_srctree) 156need-sub-make := 1 157endif 158 159ifneq ($(filter 3.%,$(MAKE_VERSION)),) 160# 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x 161# We need to invoke sub-make to avoid implicit rules in the top Makefile. 162need-sub-make := 1 163# Cancel implicit rules for this Makefile. 164$(lastword $(MAKEFILE_LIST)): ; 165endif 166 167export abs_srctree abs_objtree 168export sub_make_done := 1 169 170ifeq ($(need-sub-make),1) 171 172PHONY += $(MAKECMDGOALS) sub-make 173 174$(filter-out _all sub-make $(lastword $(MAKEFILE_LIST)), $(MAKECMDGOALS)) _all: sub-make 175 @: 176 177# Invoke a second make in the output directory, passing relevant variables 178sub-make: 179 $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS) 180 181endif # need-sub-make 182endif # sub_make_done 183 184# We process the rest of the Makefile if this is the final invocation of make 185ifeq ($(need-sub-make),) 186 187# Do not print "Entering directory ...", 188# but we want to display it when entering to the output directory 189# so that IDEs/editors are able to understand relative filenames. 190MAKEFLAGS += --no-print-directory 191 192# Call a source code checker (by default, "sparse") as part of the 193# C compilation. 194# 195# Use 'make C=1' to enable checking of only re-compiled files. 196# Use 'make C=2' to enable checking of *all* source files, regardless 197# of whether they are re-compiled or not. 198# 199# See the file "Documentation/dev-tools/sparse.rst" for more details, 200# including where to get the "sparse" utility. 201 202ifeq ("$(origin C)", "command line") 203 KBUILD_CHECKSRC = $(C) 204endif 205ifndef KBUILD_CHECKSRC 206 KBUILD_CHECKSRC = 0 207endif 208 209# Use make M=dir to specify directory of external module to build 210# Old syntax make ... SUBDIRS=$PWD is still supported 211# Setting the environment variable KBUILD_EXTMOD take precedence 212ifdef SUBDIRS 213 $(warning ================= WARNING ================) 214 $(warning 'SUBDIRS' will be removed after Linux 5.3) 215 $(warning ) 216 $(warning If you are building an individual subdirectory) 217 $(warning in the kernel tree, you can do like this:) 218 $(warning $$ make path/to/dir/you/want/to/build/) 219 $(warning (Do not forget the trailing slash)) 220 $(warning ) 221 $(warning If you are building an external module,) 222 $(warning Please use 'M=' or 'KBUILD_EXTMOD' instead) 223 $(warning ==========================================) 224 KBUILD_EXTMOD ?= $(SUBDIRS) 225endif 226 227ifeq ("$(origin M)", "command line") 228 KBUILD_EXTMOD := $(M) 229endif 230 231export KBUILD_CHECKSRC KBUILD_EXTMOD 232 233ifeq ($(abs_srctree),$(abs_objtree)) 234 # building in the source tree 235 srctree := . 236 building_out_of_srctree := 237else 238 ifeq ($(abs_srctree)/,$(dir $(abs_objtree))) 239 # building in a subdirectory of the source tree 240 srctree := .. 241 else 242 srctree := $(abs_srctree) 243 endif 244 building_out_of_srctree := 1 245endif 246 247ifneq ($(KBUILD_ABS_SRCTREE),) 248srctree := $(abs_srctree) 249endif 250 251objtree := . 252VPATH := $(srctree) 253 254export building_out_of_srctree srctree objtree VPATH 255 256# To make sure we do not include .config for any of the *config targets 257# catch them early, and hand them over to scripts/kconfig/Makefile 258# It is allowed to specify more targets when calling make, including 259# mixing *config targets and build targets. 260# For example 'make oldconfig all'. 261# Detect when mixed targets is specified, and make a second invocation 262# of make so .config is not included in this case either (for *config). 263 264version_h := include/generated/uapi/linux/version.h 265old_version_h := include/linux/version.h 266 267clean-targets := %clean mrproper cleandocs 268no-dot-config-targets := $(clean-targets) \ 269 cscope gtags TAGS tags help% %docs check% coccicheck \ 270 $(version_h) headers headers_% archheaders archscripts \ 271 %asm-generic kernelversion %src-pkg 272no-sync-config-targets := $(no-dot-config-targets) install %install \ 273 kernelrelease 274 275config-targets := 0 276mixed-targets := 0 277dot-config := 1 278may-sync-config := 1 279 280ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 281 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 282 dot-config := 0 283 endif 284endif 285 286ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),) 287 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),) 288 may-sync-config := 0 289 endif 290endif 291 292ifneq ($(KBUILD_EXTMOD),) 293 may-sync-config := 0 294endif 295 296ifeq ($(KBUILD_EXTMOD),) 297 ifneq ($(filter config %config,$(MAKECMDGOALS)),) 298 config-targets := 1 299 ifneq ($(words $(MAKECMDGOALS)),1) 300 mixed-targets := 1 301 endif 302 endif 303endif 304 305# For "make -j clean all", "make -j mrproper defconfig all", etc. 306ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),) 307 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) 308 mixed-targets := 1 309 endif 310endif 311 312# install and modules_install need also be processed one by one 313ifneq ($(filter install,$(MAKECMDGOALS)),) 314 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 315 mixed-targets := 1 316 endif 317endif 318 319ifeq ($(mixed-targets),1) 320# =========================================================================== 321# We're called with mixed targets (*config and build targets). 322# Handle them one by one. 323 324PHONY += $(MAKECMDGOALS) __build_one_by_one 325 326$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one 327 @: 328 329__build_one_by_one: 330 $(Q)set -e; \ 331 for i in $(MAKECMDGOALS); do \ 332 $(MAKE) -f $(srctree)/Makefile $$i; \ 333 done 334 335else 336 337include scripts/Kbuild.include 338 339# Read KERNELRELEASE from include/config/kernel.release (if it exists) 340KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null) 341KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 342export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 343 344include scripts/subarch.include 345 346# Cross compiling and selecting different set of gcc/bin-utils 347# --------------------------------------------------------------------------- 348# 349# When performing cross compilation for other architectures ARCH shall be set 350# to the target architecture. (See arch/* for the possibilities). 351# ARCH can be set during invocation of make: 352# make ARCH=ia64 353# Another way is to have ARCH set in the environment. 354# The default ARCH is the host where make is executed. 355 356# CROSS_COMPILE specify the prefix used for all executables used 357# during compilation. Only gcc and related bin-utils executables 358# are prefixed with $(CROSS_COMPILE). 359# CROSS_COMPILE can be set on the command line 360# make CROSS_COMPILE=ia64-linux- 361# Alternatively CROSS_COMPILE can be set in the environment. 362# Default value for CROSS_COMPILE is not to prefix executables 363# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 364ARCH ?= $(SUBARCH) 365 366# Architecture as present in compile.h 367UTS_MACHINE := $(ARCH) 368SRCARCH := $(ARCH) 369 370# Additional ARCH settings for x86 371ifeq ($(ARCH),i386) 372 SRCARCH := x86 373endif 374ifeq ($(ARCH),x86_64) 375 SRCARCH := x86 376endif 377 378# Additional ARCH settings for sparc 379ifeq ($(ARCH),sparc32) 380 SRCARCH := sparc 381endif 382ifeq ($(ARCH),sparc64) 383 SRCARCH := sparc 384endif 385 386# Additional ARCH settings for sh 387ifeq ($(ARCH),sh64) 388 SRCARCH := sh 389endif 390 391KCONFIG_CONFIG ?= .config 392export KCONFIG_CONFIG 393 394# SHELL used by kbuild 395CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \ 396 else if [ -x /bin/bash ]; then echo /bin/bash; \ 397 else echo sh; fi ; fi) 398 399HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null) 400HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null) 401HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null) 402 403HOSTCC = gcc 404HOSTCXX = g++ 405KBUILD_HOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \ 406 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) \ 407 $(HOSTCFLAGS) 408KBUILD_HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) 409KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 410KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 411 412# Make variables (CC, etc...) 413AS = $(CROSS_COMPILE)as 414LD = $(CROSS_COMPILE)ld 415CC = $(CROSS_COMPILE)gcc 416CPP = $(CC) -E 417AR = $(CROSS_COMPILE)ar 418NM = $(CROSS_COMPILE)nm 419STRIP = $(CROSS_COMPILE)strip 420OBJCOPY = $(CROSS_COMPILE)objcopy 421OBJDUMP = $(CROSS_COMPILE)objdump 422OBJSIZE = $(CROSS_COMPILE)size 423PAHOLE = pahole 424LEX = flex 425YACC = bison 426AWK = awk 427INSTALLKERNEL := installkernel 428DEPMOD = /sbin/depmod 429PERL = perl 430PYTHON = python 431PYTHON2 = python2 432PYTHON3 = python3 433CHECK = sparse 434 435CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 436 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 437NOSTDINC_FLAGS := 438CFLAGS_MODULE = 439AFLAGS_MODULE = 440LDFLAGS_MODULE = 441CFLAGS_KERNEL = 442AFLAGS_KERNEL = 443LDFLAGS_vmlinux = 444 445# Use USERINCLUDE when you must reference the UAPI directories only. 446USERINCLUDE := \ 447 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 448 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 449 -I$(srctree)/include/uapi \ 450 -I$(objtree)/include/generated/uapi \ 451 -include $(srctree)/include/linux/kconfig.h 452 453# Use LINUXINCLUDE when you must reference the include/ directory. 454# Needed to be compatible with the O= option 455LINUXINCLUDE := \ 456 -I$(srctree)/arch/$(SRCARCH)/include \ 457 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 458 $(if $(building_out_of_srctree),-I$(srctree)/include) \ 459 -I$(objtree)/include \ 460 $(USERINCLUDE) 461 462KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 463KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \ 464 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \ 465 -Werror=implicit-function-declaration -Werror=implicit-int \ 466 -Wno-format-security \ 467 -std=gnu89 468KBUILD_CPPFLAGS := -D__KERNEL__ 469KBUILD_AFLAGS_KERNEL := 470KBUILD_CFLAGS_KERNEL := 471KBUILD_AFLAGS_MODULE := -DMODULE 472KBUILD_CFLAGS_MODULE := -DMODULE 473KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds 474KBUILD_LDFLAGS := 475GCC_PLUGINS_CFLAGS := 476CLANG_FLAGS := 477 478export ARCH SRCARCH CONFIG_SHELL HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE AS LD CC 479export CPP AR NM STRIP OBJCOPY OBJDUMP OBJSIZE PAHOLE LEX YACC AWK INSTALLKERNEL 480export PERL PYTHON PYTHON2 PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 481export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE 482 483export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 484export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 485export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN 486export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 487export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 488export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 489export KBUILD_ARFLAGS 490 491# Files to ignore in find ... statements 492 493export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 494 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 495 -prune -o 496export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 497 --exclude CVS --exclude .pc --exclude .hg --exclude .git 498 499# =========================================================================== 500# Rules shared between *config targets and build targets 501 502# Basic helpers built in scripts/basic/ 503PHONY += scripts_basic 504scripts_basic: 505 $(Q)$(MAKE) $(build)=scripts/basic 506 $(Q)rm -f .tmp_quiet_recordmcount 507 508PHONY += outputmakefile 509# outputmakefile generates a Makefile in the output directory, if using a 510# separate output directory. This allows convenient use of make in the 511# output directory. 512# At the same time when output Makefile generated, generate .gitignore to 513# ignore whole output directory 514outputmakefile: 515ifdef building_out_of_srctree 516 $(Q)ln -fsn $(srctree) source 517 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree) 518 $(Q)test -e .gitignore || \ 519 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 520endif 521 522ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),) 523ifneq ($(CROSS_COMPILE),) 524CLANG_FLAGS += --target=$(notdir $(CROSS_COMPILE:%-=%)) 525GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit)) 526CLANG_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR) 527GCC_TOOLCHAIN := $(realpath $(GCC_TOOLCHAIN_DIR)/..) 528endif 529ifneq ($(GCC_TOOLCHAIN),) 530CLANG_FLAGS += --gcc-toolchain=$(GCC_TOOLCHAIN) 531endif 532ifeq ($(shell $(AS) --version 2>&1 | head -n 1 | grep clang),) 533CLANG_FLAGS += -no-integrated-as 534endif 535CLANG_FLAGS += -Werror=unknown-warning-option 536KBUILD_CFLAGS += $(CLANG_FLAGS) 537KBUILD_AFLAGS += $(CLANG_FLAGS) 538export CLANG_FLAGS 539endif 540 541# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 542# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 543# CC_VERSION_TEXT is referenced from Kconfig (so it needs export), 544# and from include/config/auto.conf.cmd to detect the compiler upgrade. 545CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1) 546 547ifeq ($(config-targets),1) 548# =========================================================================== 549# *config targets only - make sure prerequisites are updated, and descend 550# in scripts/kconfig to make the *config target 551 552# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 553# KBUILD_DEFCONFIG may point out an alternative default configuration 554# used for 'make defconfig' 555include arch/$(SRCARCH)/Makefile 556export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT 557 558config: scripts_basic outputmakefile FORCE 559 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 560 561%config: scripts_basic outputmakefile FORCE 562 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 563 564else 565# =========================================================================== 566# Build targets only - this includes vmlinux, arch specific targets, clean 567# targets and others. In general all targets except *config targets. 568 569# If building an external module we do not care about the all: rule 570# but instead _all depend on modules 571PHONY += all 572ifeq ($(KBUILD_EXTMOD),) 573_all: all 574else 575_all: modules 576endif 577 578# Decide whether to build built-in, modular, or both. 579# Normally, just do built-in. 580 581KBUILD_MODULES := 582KBUILD_BUILTIN := 1 583 584# If we have only "make modules", don't compile built-in objects. 585# When we're building modules with modversions, we need to consider 586# the built-in objects during the descend as well, in order to 587# make sure the checksums are up to date before we record them. 588 589ifeq ($(MAKECMDGOALS),modules) 590 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1) 591endif 592 593# If we have "make <whatever> modules", compile modules 594# in addition to whatever we do anyway. 595# Just "make" or "make all" shall build modules as well 596 597ifneq ($(filter all _all modules,$(MAKECMDGOALS)),) 598 KBUILD_MODULES := 1 599endif 600 601ifeq ($(MAKECMDGOALS),) 602 KBUILD_MODULES := 1 603endif 604 605export KBUILD_MODULES KBUILD_BUILTIN 606 607ifeq ($(dot-config),1) 608include include/config/auto.conf 609endif 610 611ifeq ($(KBUILD_EXTMOD),) 612# Objects we will link into vmlinux / subdirs we need to visit 613init-y := init/ 614drivers-y := drivers/ sound/ 615drivers-$(CONFIG_SAMPLES) += samples/ 616drivers-$(CONFIG_KERNEL_HEADER_TEST) += include/ 617net-y := net/ 618libs-y := lib/ 619core-y := usr/ 620virt-y := virt/ 621endif # KBUILD_EXTMOD 622 623# The all: target is the default when no target is given on the 624# command line. 625# This allow a user to issue only 'make' to build a kernel including modules 626# Defaults to vmlinux, but the arch makefile usually adds further targets 627all: vmlinux 628 629CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \ 630 $(call cc-option,-fno-tree-loop-im) \ 631 $(call cc-disable-warning,maybe-uninitialized,) 632export CFLAGS_GCOV 633 634# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 635ifdef CONFIG_FUNCTION_TRACER 636 CC_FLAGS_FTRACE := -pg 637endif 638 639RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register 640RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register 641RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk 642RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline 643RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG))) 644RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG))) 645export RETPOLINE_CFLAGS 646export RETPOLINE_VDSO_CFLAGS 647 648# The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default 649# values of the respective KBUILD_* variables 650ARCH_CPPFLAGS := 651ARCH_AFLAGS := 652ARCH_CFLAGS := 653include arch/$(SRCARCH)/Makefile 654 655ifeq ($(dot-config),1) 656ifeq ($(may-sync-config),1) 657# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 658# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 659# because some architectures define CROSS_COMPILE there. 660include include/config/auto.conf.cmd 661 662$(KCONFIG_CONFIG): 663 @echo >&2 '***' 664 @echo >&2 '*** Configuration file "$@" not found!' 665 @echo >&2 '***' 666 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 667 @echo >&2 '*** "make menuconfig" or "make xconfig").' 668 @echo >&2 '***' 669 @/bin/false 670 671# The actual configuration files used during the build are stored in 672# include/generated/ and include/config/. Update them if .config is newer than 673# include/config/auto.conf (which mirrors .config). 674# 675# This exploits the 'multi-target pattern rule' trick. 676# The syncconfig should be executed only once to make all the targets. 677%/auto.conf %/auto.conf.cmd %/tristate.conf: $(KCONFIG_CONFIG) 678 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 679else 680# External modules and some install targets need include/generated/autoconf.h 681# and include/config/auto.conf but do not care if they are up-to-date. 682# Use auto.conf to trigger the test 683PHONY += include/config/auto.conf 684 685include/config/auto.conf: 686 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 687 echo >&2; \ 688 echo >&2 " ERROR: Kernel configuration is invalid."; \ 689 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 690 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 691 echo >&2 ; \ 692 /bin/false) 693 694endif # may-sync-config 695endif # $(dot-config) 696 697KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,) 698KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) 699KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) 700KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) 701KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) 702 703ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 704KBUILD_CFLAGS += -Os 705else 706KBUILD_CFLAGS += -O2 707endif 708 709ifdef CONFIG_CC_DISABLE_WARN_MAYBE_UNINITIALIZED 710KBUILD_CFLAGS += -Wno-maybe-uninitialized 711endif 712 713# Tell gcc to never replace conditional load with a non-conditional one 714KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 715 716include scripts/Makefile.kcov 717include scripts/Makefile.gcc-plugins 718 719ifdef CONFIG_READABLE_ASM 720# Disable optimizations that make assembler listings hard to read. 721# reorder blocks reorders the control in the function 722# ipa clone creates specialized cloned functions 723# partial inlining inlines only parts of functions 724KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \ 725 $(call cc-option,-fno-ipa-cp-clone,) \ 726 $(call cc-option,-fno-partial-inlining) 727endif 728 729ifneq ($(CONFIG_FRAME_WARN),0) 730KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN}) 731endif 732 733stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector 734stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 735stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 736 737KBUILD_CFLAGS += $(stackp-flags-y) 738 739ifdef CONFIG_CC_IS_CLANG 740KBUILD_CPPFLAGS += -Qunused-arguments 741KBUILD_CFLAGS += -Wno-format-invalid-specifier 742KBUILD_CFLAGS += -Wno-gnu 743# Quiet clang warning: comparison of unsigned expression < 0 is always false 744KBUILD_CFLAGS += -Wno-tautological-compare 745# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the 746# source of a reference will be _MergedGlobals and not on of the whitelisted names. 747# See modpost pattern 2 748KBUILD_CFLAGS += -mno-global-merge 749else 750 751# These warnings generated too much noise in a regular build. 752# Use make W=1 to enable them (see scripts/Makefile.extrawarn) 753KBUILD_CFLAGS += -Wno-unused-but-set-variable 754endif 755 756KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) 757ifdef CONFIG_FRAME_POINTER 758KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 759else 760# Some targets (ARM with Thumb2, for example), can't be built with frame 761# pointers. For those, we don't have FUNCTION_TRACER automatically 762# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 763# incompatible with -fomit-frame-pointer with current GCC, so we don't use 764# -fomit-frame-pointer with FUNCTION_TRACER. 765ifndef CONFIG_FUNCTION_TRACER 766KBUILD_CFLAGS += -fomit-frame-pointer 767endif 768endif 769 770# Initialize all stack variables with a pattern, if desired. 771ifdef CONFIG_INIT_STACK_ALL 772KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 773endif 774 775DEBUG_CFLAGS := $(call cc-option, -fno-var-tracking-assignments) 776 777ifdef CONFIG_DEBUG_INFO 778ifdef CONFIG_DEBUG_INFO_SPLIT 779DEBUG_CFLAGS += -gsplit-dwarf 780else 781DEBUG_CFLAGS += -g 782endif 783KBUILD_AFLAGS += -Wa,-gdwarf-2 784endif 785ifdef CONFIG_DEBUG_INFO_DWARF4 786DEBUG_CFLAGS += -gdwarf-4 787endif 788 789ifdef CONFIG_DEBUG_INFO_REDUCED 790DEBUG_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \ 791 $(call cc-option,-fno-var-tracking) 792endif 793 794KBUILD_CFLAGS += $(DEBUG_CFLAGS) 795export DEBUG_CFLAGS 796 797ifdef CONFIG_FUNCTION_TRACER 798ifdef CONFIG_FTRACE_MCOUNT_RECORD 799 # gcc 5 supports generating the mcount tables directly 800 ifeq ($(call cc-option-yn,-mrecord-mcount),y) 801 CC_FLAGS_FTRACE += -mrecord-mcount 802 export CC_USING_RECORD_MCOUNT := 1 803 endif 804 ifdef CONFIG_HAVE_NOP_MCOUNT 805 ifeq ($(call cc-option-yn, -mnop-mcount),y) 806 CC_FLAGS_FTRACE += -mnop-mcount 807 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 808 endif 809 endif 810endif 811ifdef CONFIG_HAVE_FENTRY 812 ifeq ($(call cc-option-yn, -mfentry),y) 813 CC_FLAGS_FTRACE += -mfentry 814 CC_FLAGS_USING += -DCC_USING_FENTRY 815 endif 816endif 817export CC_FLAGS_FTRACE 818KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 819KBUILD_AFLAGS += $(CC_FLAGS_USING) 820ifdef CONFIG_DYNAMIC_FTRACE 821 ifdef CONFIG_HAVE_C_RECORDMCOUNT 822 BUILD_C_RECORDMCOUNT := y 823 export BUILD_C_RECORDMCOUNT 824 endif 825endif 826endif 827 828# We trigger additional mismatches with less inlining 829ifdef CONFIG_DEBUG_SECTION_MISMATCH 830KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) 831endif 832 833ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 834KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 835LDFLAGS_vmlinux += --gc-sections 836endif 837 838ifdef CONFIG_LIVEPATCH 839KBUILD_CFLAGS += $(call cc-option, -flive-patching=inline-clone) 840endif 841 842# arch Makefile may override CC so keep this after arch Makefile is included 843NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) 844 845# warn about C99 declaration after statement 846KBUILD_CFLAGS += -Wdeclaration-after-statement 847 848# Warn about unmarked fall-throughs in switch statement. 849KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough,) 850 851# Variable Length Arrays (VLAs) should not be used anywhere in the kernel 852KBUILD_CFLAGS += -Wvla 853 854# disable pointer signed / unsigned warnings in gcc 4.0 855KBUILD_CFLAGS += -Wno-pointer-sign 856 857# disable stringop warnings in gcc 8+ 858KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation) 859 860# disable invalid "can't wrap" optimizations for signed / pointers 861KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow) 862 863# clang sets -fmerge-all-constants by default as optimization, but this 864# is non-conforming behavior for C and in fact breaks the kernel, so we 865# need to disable it here generally. 866KBUILD_CFLAGS += $(call cc-option,-fno-merge-all-constants) 867 868# for gcc -fno-merge-all-constants disables everything, but it is fine 869# to have actual conforming behavior enabled. 870KBUILD_CFLAGS += $(call cc-option,-fmerge-constants) 871 872# Make sure -fstack-check isn't enabled (like gentoo apparently did) 873KBUILD_CFLAGS += $(call cc-option,-fno-stack-check,) 874 875# conserve stack if available 876KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) 877 878# Prohibit date/time macros, which would make the build non-deterministic 879KBUILD_CFLAGS += $(call cc-option,-Werror=date-time) 880 881# enforce correct pointer usage 882KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 883 884# Require designated initializers for all marked structures 885KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) 886 887# change __FILE__ to the relative path from the srctree 888KBUILD_CFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 889 890# ensure -fcf-protection is disabled when using retpoline as it is 891# incompatible with -mindirect-branch=thunk-extern 892ifdef CONFIG_RETPOLINE 893KBUILD_CFLAGS += $(call cc-option,-fcf-protection=none) 894endif 895 896# use the deterministic mode of AR if available 897KBUILD_ARFLAGS := $(call ar-option,D) 898 899include scripts/Makefile.kasan 900include scripts/Makefile.extrawarn 901include scripts/Makefile.ubsan 902 903# Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the 904# last assignments 905KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS) 906KBUILD_AFLAGS += $(ARCH_AFLAGS) $(KAFLAGS) 907KBUILD_CFLAGS += $(ARCH_CFLAGS) $(KCFLAGS) 908 909KBUILD_LDFLAGS_MODULE += --build-id 910LDFLAGS_vmlinux += --build-id 911 912ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 913LDFLAGS_vmlinux += $(call ld-option, -X,) 914endif 915 916# insure the checker run with the right endianness 917CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 918 919# the checker needs the correct machine size 920CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 921 922# Default kernel image to build when no specific target is given. 923# KBUILD_IMAGE may be overruled on the command line or 924# set in the environment 925# Also any assignments in arch/$(ARCH)/Makefile take precedence over 926# this default value 927export KBUILD_IMAGE ?= vmlinux 928 929# 930# INSTALL_PATH specifies where to place the updated kernel and system map 931# images. Default is /boot, but you can set it to other values 932export INSTALL_PATH ?= /boot 933 934# 935# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 936# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 937# an argument if needed. Otherwise it defaults to the kernel install path 938# 939export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 940 941# 942# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 943# relocations required by build roots. This is not defined in the 944# makefile but the argument can be passed to make if needed. 945# 946 947MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 948export MODLIB 949 950# 951# INSTALL_MOD_STRIP, if defined, will cause modules to be 952# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then 953# the default option --strip-debug will be used. Otherwise, 954# INSTALL_MOD_STRIP value will be used as the options to the strip command. 955 956ifdef INSTALL_MOD_STRIP 957ifeq ($(INSTALL_MOD_STRIP),1) 958mod_strip_cmd = $(STRIP) --strip-debug 959else 960mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP) 961endif # INSTALL_MOD_STRIP=1 962else 963mod_strip_cmd = true 964endif # INSTALL_MOD_STRIP 965export mod_strip_cmd 966 967# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed 968# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP 969# or CONFIG_MODULE_COMPRESS_XZ. 970 971mod_compress_cmd = true 972ifdef CONFIG_MODULE_COMPRESS 973 ifdef CONFIG_MODULE_COMPRESS_GZIP 974 mod_compress_cmd = gzip -n -f 975 endif # CONFIG_MODULE_COMPRESS_GZIP 976 ifdef CONFIG_MODULE_COMPRESS_XZ 977 mod_compress_cmd = xz -f 978 endif # CONFIG_MODULE_COMPRESS_XZ 979endif # CONFIG_MODULE_COMPRESS 980export mod_compress_cmd 981 982ifdef CONFIG_MODULE_SIG_ALL 983$(eval $(call config_filename,MODULE_SIG_KEY)) 984 985mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509 986else 987mod_sign_cmd = true 988endif 989export mod_sign_cmd 990 991HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf) 992 993ifdef CONFIG_STACK_VALIDATION 994 has_libelf := $(call try-run,\ 995 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0) 996 ifeq ($(has_libelf),1) 997 objtool_target := tools/objtool FORCE 998 else 999 SKIP_STACK_VALIDATION := 1 1000 export SKIP_STACK_VALIDATION 1001 endif 1002endif 1003 1004PHONY += prepare0 1005 1006export MODORDER := $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)modules.order 1007 1008ifeq ($(KBUILD_EXTMOD),) 1009core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/ 1010 1011vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \ 1012 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 1013 $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y))) 1014 1015vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \ 1016 $(patsubst %/,%,$(filter %/, $(init-) $(core-) \ 1017 $(drivers-) $(net-) $(libs-) $(virt-)))) 1018 1019init-y := $(patsubst %/, %/built-in.a, $(init-y)) 1020core-y := $(patsubst %/, %/built-in.a, $(core-y)) 1021drivers-y := $(patsubst %/, %/built-in.a, $(drivers-y)) 1022net-y := $(patsubst %/, %/built-in.a, $(net-y)) 1023libs-y1 := $(patsubst %/, %/lib.a, $(libs-y)) 1024libs-y2 := $(patsubst %/, %/built-in.a, $(filter-out %.a, $(libs-y))) 1025virt-y := $(patsubst %/, %/built-in.a, $(virt-y)) 1026 1027# Externally visible symbols (used by link-vmlinux.sh) 1028export KBUILD_VMLINUX_OBJS := $(head-y) $(init-y) $(core-y) $(libs-y2) \ 1029 $(drivers-y) $(net-y) $(virt-y) 1030export KBUILD_VMLINUX_LIBS := $(libs-y1) 1031export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1032export LDFLAGS_vmlinux 1033# used by scripts/package/Makefile 1034export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools) 1035 1036vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS) 1037 1038# Recurse until adjust_autoksyms.sh is satisfied 1039PHONY += autoksyms_recursive 1040ifdef CONFIG_TRIM_UNUSED_KSYMS 1041autoksyms_recursive: $(vmlinux-deps) modules.order 1042 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ 1043 "$(MAKE) -f $(srctree)/Makefile vmlinux" 1044endif 1045 1046# For the kernel to actually contain only the needed exported symbols, 1047# we have to build modules as well to determine what those symbols are. 1048# (this can be evaluated only once include/config/auto.conf has been included) 1049ifdef CONFIG_TRIM_UNUSED_KSYMS 1050 KBUILD_MODULES := 1 1051endif 1052 1053autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h) 1054 1055$(autoksyms_h): 1056 $(Q)mkdir -p $(dir $@) 1057 $(Q)touch $@ 1058 1059ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink) 1060 1061# Final link of vmlinux with optional arch pass after final link 1062cmd_link-vmlinux = \ 1063 $(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ; \ 1064 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) 1065 1066vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE 1067 +$(call if_changed,link-vmlinux) 1068 1069targets := vmlinux 1070 1071# The actual objects are generated when descending, 1072# make sure no implicit rule kicks in 1073$(sort $(vmlinux-deps)): $(vmlinux-dirs) ; 1074 1075# Handle descending into subdirectories listed in $(vmlinux-dirs) 1076# Preset locale variables to speed up the build process. Limit locale 1077# tweaks to this spot to avoid wrong language settings when running 1078# make menuconfig etc. 1079# Error messages still appears in the original language 1080 1081PHONY += $(vmlinux-dirs) 1082$(vmlinux-dirs): prepare 1083 $(Q)$(MAKE) $(build)=$@ need-builtin=1 need-modorder=1 1084 1085filechk_kernel.release = \ 1086 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1087 1088# Store (new) KERNELRELEASE string in include/config/kernel.release 1089include/config/kernel.release: FORCE 1090 $(call filechk,kernel.release) 1091 1092# Additional helpers built in scripts/ 1093# Carefully list dependencies so we do not try to build scripts twice 1094# in parallel 1095PHONY += scripts 1096scripts: scripts_basic scripts_dtc 1097 $(Q)$(MAKE) $(build)=$(@) 1098 1099# Things we need to do before we recursively start building the kernel 1100# or the modules are listed in "prepare". 1101# A multi level approach is used. prepareN is processed before prepareN-1. 1102# archprepare is used in arch Makefiles and when processed asm symlink, 1103# version.h and scripts_basic is processed / created. 1104 1105PHONY += prepare archprepare prepare3 1106 1107# prepare3 is used to check if we are building in a separate output directory, 1108# and if so do: 1109# 1) Check that make has not been executed in the kernel src $(srctree) 1110prepare3: include/config/kernel.release 1111ifdef building_out_of_srctree 1112 @$(kecho) ' Using $(srctree) as source for kernel' 1113 $(Q)if [ -f $(srctree)/.config -o \ 1114 -d $(srctree)/include/config -o \ 1115 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 1116 echo >&2 " $(srctree) is not clean, please run 'make ARCH=$(ARCH) mrproper'"; \ 1117 echo >&2 " in the '$(srctree)' directory.";\ 1118 /bin/false; \ 1119 fi; 1120endif 1121 1122archprepare: archheaders archscripts scripts prepare3 outputmakefile \ 1123 asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h 1124 1125prepare0: archprepare 1126 $(Q)$(MAKE) $(build)=scripts/mod 1127 $(Q)$(MAKE) $(build)=. 1128 1129# All the preparing.. 1130prepare: prepare0 prepare-objtool 1131 1132# Support for using generic headers in asm-generic 1133asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj 1134 1135PHONY += asm-generic uapi-asm-generic 1136asm-generic: uapi-asm-generic 1137 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1138 generic=include/asm-generic 1139uapi-asm-generic: 1140 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1141 generic=include/uapi/asm-generic 1142 1143PHONY += prepare-objtool 1144prepare-objtool: $(objtool_target) 1145ifeq ($(SKIP_STACK_VALIDATION),1) 1146ifdef CONFIG_UNWINDER_ORC 1147 @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1148 @false 1149else 1150 @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1151endif 1152endif 1153 1154# Generate some files 1155# --------------------------------------------------------------------------- 1156 1157# KERNELRELEASE can change from a few different places, meaning version.h 1158# needs to be updated, so this check is forced on all builds 1159 1160uts_len := 64 1161define filechk_utsrelease.h 1162 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1163 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1164 exit 1; \ 1165 fi; \ 1166 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1167endef 1168 1169define filechk_version.h 1170 echo \#define LINUX_VERSION_CODE $(shell \ 1171 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \ 1172 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))' 1173endef 1174 1175$(version_h): FORCE 1176 $(call filechk,version.h) 1177 $(Q)rm -f $(old_version_h) 1178 1179include/generated/utsrelease.h: include/config/kernel.release FORCE 1180 $(call filechk,utsrelease.h) 1181 1182PHONY += headerdep 1183headerdep: 1184 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1185 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1186 1187# --------------------------------------------------------------------------- 1188# Kernel headers 1189 1190#Default location for installed headers 1191export INSTALL_HDR_PATH = $(objtree)/usr 1192 1193quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1194 cmd_headers_install = \ 1195 mkdir -p $(INSTALL_HDR_PATH); \ 1196 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1197 usr/include $(INSTALL_HDR_PATH) 1198 1199PHONY += headers_install 1200headers_install: headers 1201 $(call cmd,headers_install) 1202 1203PHONY += archheaders archscripts 1204 1205hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1206 1207PHONY += headers 1208headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts 1209 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \ 1210 $(error Headers not exportable for the $(SRCARCH) architecture)) 1211 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1212 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1213 1214PHONY += headers_check 1215headers_check: headers 1216 $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1 1217 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi HDRCHECK=1 1218 1219ifdef CONFIG_HEADERS_INSTALL 1220prepare: headers 1221endif 1222 1223ifdef CONFIG_HEADERS_CHECK 1224all: headers_check 1225endif 1226 1227PHONY += scripts_unifdef 1228scripts_unifdef: scripts_basic 1229 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1230 1231# --------------------------------------------------------------------------- 1232# Kernel selftest 1233 1234PHONY += kselftest 1235kselftest: 1236 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1237 1238PHONY += kselftest-clean 1239kselftest-clean: 1240 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean 1241 1242PHONY += kselftest-merge 1243kselftest-merge: 1244 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1245 $(Q)find $(srctree)/tools/testing/selftests -name config | \ 1246 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config 1247 +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1248 1249# --------------------------------------------------------------------------- 1250# Devicetree files 1251 1252ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1253dtstree := arch/$(SRCARCH)/boot/dts 1254endif 1255 1256ifneq ($(dtstree),) 1257 1258%.dtb: prepare3 scripts_dtc 1259 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1260 1261PHONY += dtbs dtbs_install dt_binding_check 1262dtbs dtbs_check: prepare3 scripts_dtc 1263 $(Q)$(MAKE) $(build)=$(dtstree) 1264 1265dtbs_check: export CHECK_DTBS=1 1266dtbs_check: dt_binding_check 1267 1268dtbs_install: 1269 $(Q)$(MAKE) $(dtbinst)=$(dtstree) 1270 1271ifdef CONFIG_OF_EARLY_FLATTREE 1272all: dtbs 1273endif 1274 1275endif 1276 1277PHONY += scripts_dtc 1278scripts_dtc: scripts_basic 1279 $(Q)$(MAKE) $(build)=scripts/dtc 1280 1281dt_binding_check: scripts_dtc 1282 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings 1283 1284# --------------------------------------------------------------------------- 1285# Modules 1286 1287ifdef CONFIG_MODULES 1288 1289# By default, build modules as well 1290 1291all: modules 1292 1293# Build modules 1294# 1295# A module can be listed more than once in obj-m resulting in 1296# duplicate lines in modules.order files. Those are removed 1297# using awk while concatenating to the final file. 1298 1299PHONY += modules 1300modules: $(if $(KBUILD_BUILTIN),vmlinux) modules.order modules.builtin 1301 @$(kecho) ' Building modules, stage 2.'; 1302 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1303 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh 1304 1305modules.order: $(vmlinux-dirs) 1306 $(Q)$(AWK) '!x[$$0]++' $(addsuffix /$@, $(vmlinux-dirs)) > $@ 1307 1308modbuiltin-dirs := $(addprefix _modbuiltin_, $(vmlinux-dirs)) 1309 1310modules.builtin: $(modbuiltin-dirs) 1311 $(Q)$(AWK) '!x[$$0]++' $(addsuffix /$@, $(vmlinux-dirs)) > $@ 1312 1313PHONY += $(modbuiltin-dirs) 1314# tristate.conf is not included from this Makefile. Add it as a prerequisite 1315# here to make it self-healing in case somebody accidentally removes it. 1316$(modbuiltin-dirs): include/config/tristate.conf 1317 $(Q)$(MAKE) $(modbuiltin)=$(patsubst _modbuiltin_%,%,$@) 1318 1319# Target to prepare building external modules 1320PHONY += modules_prepare 1321modules_prepare: prepare 1322 1323# Target to install modules 1324PHONY += modules_install 1325modules_install: _modinst_ _modinst_post 1326 1327PHONY += _modinst_ 1328_modinst_: 1329 @rm -rf $(MODLIB)/kernel 1330 @rm -f $(MODLIB)/source 1331 @mkdir -p $(MODLIB)/kernel 1332 @ln -s $(abspath $(srctree)) $(MODLIB)/source 1333 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1334 rm -f $(MODLIB)/build ; \ 1335 ln -s $(CURDIR) $(MODLIB)/build ; \ 1336 fi 1337 @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order 1338 @sed 's:^:kernel/:' modules.builtin > $(MODLIB)/modules.builtin 1339 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/ 1340 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1341 1342# This depmod is only for convenience to give the initial 1343# boot a modules.dep even before / is mounted read-write. However the 1344# boot script depmod is the master version. 1345PHONY += _modinst_post 1346_modinst_post: _modinst_ 1347 $(call cmd,depmod) 1348 1349ifeq ($(CONFIG_MODULE_SIG), y) 1350PHONY += modules_sign 1351modules_sign: 1352 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign 1353endif 1354 1355else # CONFIG_MODULES 1356 1357# Modules not configured 1358# --------------------------------------------------------------------------- 1359 1360PHONY += modules modules_install 1361modules modules_install: 1362 @echo >&2 1363 @echo >&2 "The present kernel configuration has modules disabled." 1364 @echo >&2 "Type 'make config' and enable loadable module support." 1365 @echo >&2 "Then build a kernel with module support enabled." 1366 @echo >&2 1367 @exit 1 1368 1369endif # CONFIG_MODULES 1370 1371### 1372# Cleaning is done on three levels. 1373# make clean Delete most generated files 1374# Leave enough to build external modules 1375# make mrproper Delete the current configuration, and all generated files 1376# make distclean Remove editor backup files, patch leftover files and the like 1377 1378# Directories & files removed with 'make clean' 1379CLEAN_DIRS += include/ksym 1380CLEAN_FILES += modules.builtin.modinfo 1381 1382# Directories & files removed with 'make mrproper' 1383MRPROPER_DIRS += include/config include/generated \ 1384 arch/$(SRCARCH)/include/generated .tmp_objdiff 1385MRPROPER_FILES += .config .config.old .version \ 1386 Module.symvers \ 1387 signing_key.pem signing_key.priv signing_key.x509 \ 1388 x509.genkey extra_certificates signing_key.x509.keyid \ 1389 signing_key.x509.signer vmlinux-gdb.py 1390 1391# Directories & files removed with 'make distclean' 1392DISTCLEAN_DIRS += 1393DISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS 1394 1395# clean - Delete most, but leave enough to build external modules 1396# 1397clean: rm-dirs := $(CLEAN_DIRS) 1398clean: rm-files := $(CLEAN_FILES) 1399clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs)) 1400 1401PHONY += $(clean-dirs) clean archclean vmlinuxclean 1402$(clean-dirs): 1403 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1404 1405vmlinuxclean: 1406 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1407 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1408 1409clean: archclean vmlinuxclean 1410 1411# mrproper - Delete all generated files, including .config 1412# 1413mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS)) 1414mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1415mrproper-dirs := $(addprefix _mrproper_,scripts) 1416 1417PHONY += $(mrproper-dirs) mrproper 1418$(mrproper-dirs): 1419 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1420 1421mrproper: clean $(mrproper-dirs) 1422 $(call cmd,rmdirs) 1423 $(call cmd,rmfiles) 1424 1425# distclean 1426# 1427distclean: rm-dirs := $(wildcard $(DISTCLEAN_DIRS)) 1428distclean: rm-files := $(wildcard $(DISTCLEAN_FILES)) 1429 1430PHONY += distclean 1431 1432distclean: mrproper 1433 $(call cmd,rmdirs) 1434 $(call cmd,rmfiles) 1435 @find $(srctree) $(RCS_FIND_IGNORE) \ 1436 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1437 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1438 -o -name 'core' \) \ 1439 -type f -print | xargs rm -f 1440 1441 1442# Packaging of the kernel to various formats 1443# --------------------------------------------------------------------------- 1444package-dir := scripts/package 1445 1446%src-pkg: FORCE 1447 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1448%pkg: include/config/kernel.release FORCE 1449 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1450 1451 1452# Brief documentation of the typical targets used 1453# --------------------------------------------------------------------------- 1454 1455boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1456boards := $(sort $(notdir $(boards))) 1457board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1458board-dirs := $(sort $(notdir $(board-dirs:/=))) 1459 1460PHONY += help 1461help: 1462 @echo 'Cleaning targets:' 1463 @echo ' clean - Remove most generated files but keep the config and' 1464 @echo ' enough build support to build external modules' 1465 @echo ' mrproper - Remove all generated files + config + various backup files' 1466 @echo ' distclean - mrproper + remove editor backup and patch files' 1467 @echo '' 1468 @echo 'Configuration targets:' 1469 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1470 @echo '' 1471 @echo 'Other generic targets:' 1472 @echo ' all - Build all targets marked with [*]' 1473 @echo '* vmlinux - Build the bare kernel' 1474 @echo '* modules - Build all modules' 1475 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1476 @echo ' dir/ - Build all files in dir and below' 1477 @echo ' dir/file.[ois] - Build specified target only' 1478 @echo ' dir/file.ll - Build the LLVM assembly file' 1479 @echo ' (requires compiler support for LLVM assembly generation)' 1480 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1481 @echo ' (requires a recent binutils and recent build (System.map))' 1482 @echo ' dir/file.ko - Build module including final link' 1483 @echo ' modules_prepare - Set up for building external modules' 1484 @echo ' tags/TAGS - Generate tags file for editors' 1485 @echo ' cscope - Generate cscope index' 1486 @echo ' gtags - Generate GNU GLOBAL index' 1487 @echo ' kernelrelease - Output the release version string (use with make -s)' 1488 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1489 @echo ' image_name - Output the image name (use with make -s)' 1490 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1491 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1492 echo '' 1493 @echo 'Static analysers:' 1494 @echo ' checkstack - Generate a list of stack hogs' 1495 @echo ' namespacecheck - Name space analysis on compiled kernel' 1496 @echo ' versioncheck - Sanity check on version.h usage' 1497 @echo ' includecheck - Check for duplicate included header files' 1498 @echo ' export_report - List the usages of all exported symbols' 1499 @echo ' headers_check - Sanity check on exported headers' 1500 @echo ' headerdep - Detect inclusion cycles in headers' 1501 @echo ' coccicheck - Check with Coccinelle' 1502 @echo '' 1503 @echo 'Kernel selftest:' 1504 @echo ' kselftest - Build and run kernel selftest (run as root)' 1505 @echo ' Build, install, and boot kernel before' 1506 @echo ' running kselftest on it' 1507 @echo ' kselftest-clean - Remove all generated kselftest files' 1508 @echo ' kselftest-merge - Merge all the config dependencies of kselftest to existing' 1509 @echo ' .config.' 1510 @echo '' 1511 @$(if $(dtstree), \ 1512 echo 'Devicetree:'; \ 1513 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1514 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1515 echo '') 1516 1517 @echo 'Userspace tools targets:' 1518 @echo ' use "make tools/help"' 1519 @echo ' or "cd tools; make help"' 1520 @echo '' 1521 @echo 'Kernel packaging:' 1522 @$(MAKE) $(build)=$(package-dir) help 1523 @echo '' 1524 @echo 'Documentation targets:' 1525 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1526 @echo '' 1527 @echo 'Architecture specific targets ($(SRCARCH)):' 1528 @$(if $(archhelp),$(archhelp),\ 1529 echo ' No architecture specific help defined for $(SRCARCH)') 1530 @echo '' 1531 @$(if $(boards), \ 1532 $(foreach b, $(boards), \ 1533 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1534 echo '') 1535 @$(if $(board-dirs), \ 1536 $(foreach b, $(board-dirs), \ 1537 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1538 printf " %-16s - Show all of the above\\n" help-boards; \ 1539 echo '') 1540 1541 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1542 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1543 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1544 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK (sparse by default)' 1545 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1546 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1547 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where' 1548 @echo ' 1: warnings which may be relevant and do not occur too often' 1549 @echo ' 2: warnings which occur quite often but may still be relevant' 1550 @echo ' 3: more obscure warnings, can most likely be ignored' 1551 @echo ' Multiple levels can be combined with W=12 or W=123' 1552 @echo '' 1553 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1554 @echo 'For further info see the ./README file' 1555 1556 1557help-board-dirs := $(addprefix help-,$(board-dirs)) 1558 1559help-boards: $(help-board-dirs) 1560 1561boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1562 1563$(help-board-dirs): help-%: 1564 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1565 @$(if $(boards-per-dir), \ 1566 $(foreach b, $(boards-per-dir), \ 1567 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1568 echo '') 1569 1570 1571# Documentation targets 1572# --------------------------------------------------------------------------- 1573DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1574 linkcheckdocs dochelp refcheckdocs 1575PHONY += $(DOC_TARGETS) 1576$(DOC_TARGETS): scripts_basic FORCE 1577 $(Q)$(MAKE) $(build)=Documentation $@ 1578 1579# Misc 1580# --------------------------------------------------------------------------- 1581 1582PHONY += scripts_gdb 1583scripts_gdb: prepare0 1584 $(Q)$(MAKE) $(build)=scripts/gdb 1585 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1586 1587ifdef CONFIG_GDB_SCRIPTS 1588all: scripts_gdb 1589endif 1590 1591else # KBUILD_EXTMOD 1592 1593### 1594# External module support. 1595# When building external modules the kernel used as basis is considered 1596# read-only, and no consistency checks are made and the make 1597# system is not used on the basis kernel. If updates are required 1598# in the basis kernel ordinary make commands (without M=...) must 1599# be used. 1600# 1601# The following are the only valid targets when building external 1602# modules. 1603# make M=dir clean Delete all automatically generated files 1604# make M=dir modules Make all modules in specified dir 1605# make M=dir Same as 'make M=dir modules' 1606# make M=dir modules_install 1607# Install the modules built in the module directory 1608# Assumes install directory is already created 1609 1610# We are always building modules 1611KBUILD_MODULES := 1 1612 1613PHONY += $(objtree)/Module.symvers 1614$(objtree)/Module.symvers: 1615 @test -e $(objtree)/Module.symvers || ( \ 1616 echo; \ 1617 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \ 1618 echo " is missing; modules will have no dependencies and modversions."; \ 1619 echo ) 1620 1621module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD)) 1622PHONY += $(module-dirs) modules 1623$(module-dirs): prepare $(objtree)/Module.symvers 1624 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@) need-modorder=1 1625 1626modules: $(module-dirs) 1627 @$(kecho) ' Building modules, stage 2.'; 1628 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1629 1630PHONY += modules_install 1631modules_install: _emodinst_ _emodinst_post 1632 1633install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra) 1634PHONY += _emodinst_ 1635_emodinst_: 1636 $(Q)mkdir -p $(MODLIB)/$(install-dir) 1637 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1638 1639PHONY += _emodinst_post 1640_emodinst_post: _emodinst_ 1641 $(call cmd,depmod) 1642 1643clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD)) 1644 1645PHONY += $(clean-dirs) clean 1646$(clean-dirs): 1647 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1648 1649clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers 1650 1651PHONY += help 1652help: 1653 @echo ' Building external modules.' 1654 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1655 @echo '' 1656 @echo ' modules - default target, build the module(s)' 1657 @echo ' modules_install - install the module' 1658 @echo ' clean - remove generated files in module directory only' 1659 @echo '' 1660 1661PHONY += prepare 1662endif # KBUILD_EXTMOD 1663 1664clean: $(clean-dirs) 1665 $(call cmd,rmdirs) 1666 $(call cmd,rmfiles) 1667 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1668 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \ 1669 -o -name '*.ko.*' \ 1670 -o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \ 1671 -o -name '*.dwo' -o -name '*.lst' \ 1672 -o -name '*.su' -o -name '*.mod' \ 1673 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1674 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 1675 -o -name '*.asn1.[ch]' \ 1676 -o -name '*.symtypes' -o -name 'modules.order' \ 1677 -o -name modules.builtin -o -name '.tmp_*.o.*' \ 1678 -o -name '*.c.[012]*.*' \ 1679 -o -name '*.ll' \ 1680 -o -name '*.gcno' \) -type f -print | xargs rm -f 1681 1682# Generate tags for editors 1683# --------------------------------------------------------------------------- 1684quiet_cmd_tags = GEN $@ 1685 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@ 1686 1687tags TAGS cscope gtags: FORCE 1688 $(call cmd,tags) 1689 1690# Scripts to check various things for consistency 1691# --------------------------------------------------------------------------- 1692 1693PHONY += includecheck versioncheck coccicheck namespacecheck export_report 1694 1695includecheck: 1696 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1697 -name '*.[hcS]' -type f -print | sort \ 1698 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1699 1700versioncheck: 1701 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1702 -name '*.[hcS]' -type f -print | sort \ 1703 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1704 1705coccicheck: 1706 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@ 1707 1708namespacecheck: 1709 $(PERL) $(srctree)/scripts/namespace.pl 1710 1711export_report: 1712 $(PERL) $(srctree)/scripts/export_report.pl 1713 1714PHONY += checkstack kernelrelease kernelversion image_name 1715 1716# UML needs a little special treatment here. It wants to use the host 1717# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1718# else wants $(ARCH), including people doing cross-builds, which means 1719# that $(SUBARCH) doesn't work here. 1720ifeq ($(ARCH), um) 1721CHECKSTACK_ARCH := $(SUBARCH) 1722else 1723CHECKSTACK_ARCH := $(ARCH) 1724endif 1725checkstack: 1726 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1727 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1728 1729kernelrelease: 1730 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1731 1732kernelversion: 1733 @echo $(KERNELVERSION) 1734 1735image_name: 1736 @echo $(KBUILD_IMAGE) 1737 1738# Clear a bunch of variables before executing the submake 1739 1740ifeq ($(quiet),silent_) 1741tools_silent=s 1742endif 1743 1744tools/: FORCE 1745 $(Q)mkdir -p $(objtree)/tools 1746 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1747 1748tools/%: FORCE 1749 $(Q)mkdir -p $(objtree)/tools 1750 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1751 1752# Single targets 1753# --------------------------------------------------------------------------- 1754# Single targets are compatible with: 1755# - build with mixed source and output 1756# - build with separate output dir 'make O=...' 1757# - external modules 1758# 1759# target-dir => where to store outputfile 1760# build-dir => directory in kernel source tree to use 1761 1762build-target = $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD)/)$@ 1763build-dir = $(patsubst %/,%,$(dir $(build-target))) 1764 1765%.i: prepare FORCE 1766 $(Q)$(MAKE) $(build)=$(build-dir) $(build-target) 1767%.ll: prepare FORCE 1768 $(Q)$(MAKE) $(build)=$(build-dir) $(build-target) 1769%.lst: prepare FORCE 1770 $(Q)$(MAKE) $(build)=$(build-dir) $(build-target) 1771%.o: prepare FORCE 1772 $(Q)$(MAKE) $(build)=$(build-dir) $(build-target) 1773%.s: prepare FORCE 1774 $(Q)$(MAKE) $(build)=$(build-dir) $(build-target) 1775%.symtypes: prepare FORCE 1776 $(Q)$(MAKE) $(build)=$(build-dir) $(build-target) 1777ifeq ($(KBUILD_EXTMOD),) 1778# For the single build of an in-tree module, use a temporary file to avoid 1779# the situation of modules_install installing an invalid modules.order. 1780%.ko: MODORDER := .modules.tmp 1781endif 1782%.ko: prepare FORCE 1783 $(Q)$(MAKE) $(build)=$(build-dir) $(build-target:.ko=.mod) 1784 $(Q)echo $(build-target) > $(MODORDER) 1785 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1786 1787# Modules 1788PHONY += / 1789/: ./ 1790 1791%/: prepare FORCE 1792 $(Q)$(MAKE) KBUILD_MODULES=1 $(build)=$(build-dir) need-modorder=1 1793 1794# FIXME Should go into a make.lib or something 1795# =========================================================================== 1796 1797quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs))) 1798 cmd_rmdirs = rm -rf $(rm-dirs) 1799 1800quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1801 cmd_rmfiles = rm -f $(rm-files) 1802 1803# Run depmod only if we have System.map and depmod is executable 1804quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) 1805 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1806 $(KERNELRELEASE) 1807 1808# read saved command lines for existing targets 1809existing-targets := $(wildcard $(sort $(targets))) 1810 1811-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 1812 1813endif # ifeq ($(config-targets),1) 1814endif # ifeq ($(mixed-targets),1) 1815endif # need-sub-make 1816 1817PHONY += FORCE 1818FORCE: 1819 1820# Declare the contents of the PHONY variable as phony. We keep that 1821# information in a variable so we can use it in if_changed and friends. 1822.PHONY: $(PHONY) 1823