1# SPDX-License-Identifier: GPL-2.0 2VERSION = 5 3PATCHLEVEL = 3 4SUBLEVEL = 0 5EXTRAVERSION = -rc4 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 233extmod-prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/) 234 235ifeq ($(abs_srctree),$(abs_objtree)) 236 # building in the source tree 237 srctree := . 238 building_out_of_srctree := 239else 240 ifeq ($(abs_srctree)/,$(dir $(abs_objtree))) 241 # building in a subdirectory of the source tree 242 srctree := .. 243 else 244 srctree := $(abs_srctree) 245 endif 246 building_out_of_srctree := 1 247endif 248 249ifneq ($(KBUILD_ABS_SRCTREE),) 250srctree := $(abs_srctree) 251endif 252 253objtree := . 254VPATH := $(srctree) 255 256export building_out_of_srctree srctree objtree VPATH 257 258# To make sure we do not include .config for any of the *config targets 259# catch them early, and hand them over to scripts/kconfig/Makefile 260# It is allowed to specify more targets when calling make, including 261# mixing *config targets and build targets. 262# For example 'make oldconfig all'. 263# Detect when mixed targets is specified, and make a second invocation 264# of make so .config is not included in this case either (for *config). 265 266version_h := include/generated/uapi/linux/version.h 267old_version_h := include/linux/version.h 268 269clean-targets := %clean mrproper cleandocs 270no-dot-config-targets := $(clean-targets) \ 271 cscope gtags TAGS tags help% %docs check% coccicheck \ 272 $(version_h) headers headers_% archheaders archscripts \ 273 %asm-generic kernelversion %src-pkg 274no-sync-config-targets := $(no-dot-config-targets) install %install \ 275 kernelrelease 276single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/ 277 278config-build := 279mixed-build := 280need-config := 1 281may-sync-config := 1 282single-build := 283 284ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 285 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 286 need-config := 287 endif 288endif 289 290ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),) 291 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),) 292 may-sync-config := 293 endif 294endif 295 296ifneq ($(KBUILD_EXTMOD),) 297 may-sync-config := 298endif 299 300ifeq ($(KBUILD_EXTMOD),) 301 ifneq ($(filter config %config,$(MAKECMDGOALS)),) 302 config-build := 1 303 ifneq ($(words $(MAKECMDGOALS)),1) 304 mixed-build := 1 305 endif 306 endif 307endif 308 309# We cannot build single targets and the others at the same time 310ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),) 311 single-build := 1 312 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),) 313 mixed-build := 1 314 endif 315endif 316 317# For "make -j clean all", "make -j mrproper defconfig all", etc. 318ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),) 319 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) 320 mixed-build := 1 321 endif 322endif 323 324# install and modules_install need also be processed one by one 325ifneq ($(filter install,$(MAKECMDGOALS)),) 326 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 327 mixed-build := 1 328 endif 329endif 330 331ifdef mixed-build 332# =========================================================================== 333# We're called with mixed targets (*config and build targets). 334# Handle them one by one. 335 336PHONY += $(MAKECMDGOALS) __build_one_by_one 337 338$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one 339 @: 340 341__build_one_by_one: 342 $(Q)set -e; \ 343 for i in $(MAKECMDGOALS); do \ 344 $(MAKE) -f $(srctree)/Makefile $$i; \ 345 done 346 347else # !mixed-build 348 349include scripts/Kbuild.include 350 351# Read KERNELRELEASE from include/config/kernel.release (if it exists) 352KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null) 353KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 354export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 355 356include scripts/subarch.include 357 358# Cross compiling and selecting different set of gcc/bin-utils 359# --------------------------------------------------------------------------- 360# 361# When performing cross compilation for other architectures ARCH shall be set 362# to the target architecture. (See arch/* for the possibilities). 363# ARCH can be set during invocation of make: 364# make ARCH=ia64 365# Another way is to have ARCH set in the environment. 366# The default ARCH is the host where make is executed. 367 368# CROSS_COMPILE specify the prefix used for all executables used 369# during compilation. Only gcc and related bin-utils executables 370# are prefixed with $(CROSS_COMPILE). 371# CROSS_COMPILE can be set on the command line 372# make CROSS_COMPILE=ia64-linux- 373# Alternatively CROSS_COMPILE can be set in the environment. 374# Default value for CROSS_COMPILE is not to prefix executables 375# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 376ARCH ?= $(SUBARCH) 377 378# Architecture as present in compile.h 379UTS_MACHINE := $(ARCH) 380SRCARCH := $(ARCH) 381 382# Additional ARCH settings for x86 383ifeq ($(ARCH),i386) 384 SRCARCH := x86 385endif 386ifeq ($(ARCH),x86_64) 387 SRCARCH := x86 388endif 389 390# Additional ARCH settings for sparc 391ifeq ($(ARCH),sparc32) 392 SRCARCH := sparc 393endif 394ifeq ($(ARCH),sparc64) 395 SRCARCH := sparc 396endif 397 398# Additional ARCH settings for sh 399ifeq ($(ARCH),sh64) 400 SRCARCH := sh 401endif 402 403KCONFIG_CONFIG ?= .config 404export KCONFIG_CONFIG 405 406# SHELL used by kbuild 407CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \ 408 else if [ -x /bin/bash ]; then echo /bin/bash; \ 409 else echo sh; fi ; fi) 410 411HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null) 412HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null) 413HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null) 414 415HOSTCC = gcc 416HOSTCXX = g++ 417KBUILD_HOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \ 418 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) \ 419 $(HOSTCFLAGS) 420KBUILD_HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) 421KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 422KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 423 424# Make variables (CC, etc...) 425AS = $(CROSS_COMPILE)as 426LD = $(CROSS_COMPILE)ld 427CC = $(CROSS_COMPILE)gcc 428CPP = $(CC) -E 429AR = $(CROSS_COMPILE)ar 430NM = $(CROSS_COMPILE)nm 431STRIP = $(CROSS_COMPILE)strip 432OBJCOPY = $(CROSS_COMPILE)objcopy 433OBJDUMP = $(CROSS_COMPILE)objdump 434OBJSIZE = $(CROSS_COMPILE)size 435PAHOLE = pahole 436LEX = flex 437YACC = bison 438AWK = awk 439INSTALLKERNEL := installkernel 440DEPMOD = /sbin/depmod 441PERL = perl 442PYTHON = python 443PYTHON2 = python2 444PYTHON3 = python3 445CHECK = sparse 446 447CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 448 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 449NOSTDINC_FLAGS := 450CFLAGS_MODULE = 451AFLAGS_MODULE = 452LDFLAGS_MODULE = 453CFLAGS_KERNEL = 454AFLAGS_KERNEL = 455LDFLAGS_vmlinux = 456 457# Use USERINCLUDE when you must reference the UAPI directories only. 458USERINCLUDE := \ 459 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 460 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 461 -I$(srctree)/include/uapi \ 462 -I$(objtree)/include/generated/uapi \ 463 -include $(srctree)/include/linux/kconfig.h 464 465# Use LINUXINCLUDE when you must reference the include/ directory. 466# Needed to be compatible with the O= option 467LINUXINCLUDE := \ 468 -I$(srctree)/arch/$(SRCARCH)/include \ 469 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 470 $(if $(building_out_of_srctree),-I$(srctree)/include) \ 471 -I$(objtree)/include \ 472 $(USERINCLUDE) 473 474KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 475KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \ 476 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \ 477 -Werror=implicit-function-declaration -Werror=implicit-int \ 478 -Wno-format-security \ 479 -std=gnu89 480KBUILD_CPPFLAGS := -D__KERNEL__ 481KBUILD_AFLAGS_KERNEL := 482KBUILD_CFLAGS_KERNEL := 483KBUILD_AFLAGS_MODULE := -DMODULE 484KBUILD_CFLAGS_MODULE := -DMODULE 485KBUILD_LDFLAGS_MODULE := 486export KBUILD_LDS_MODULE := $(srctree)/scripts/module-common.lds 487KBUILD_LDFLAGS := 488GCC_PLUGINS_CFLAGS := 489CLANG_FLAGS := 490 491export ARCH SRCARCH CONFIG_SHELL HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE AS LD CC 492export CPP AR NM STRIP OBJCOPY OBJDUMP OBJSIZE PAHOLE LEX YACC AWK INSTALLKERNEL 493export PERL PYTHON PYTHON2 PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 494export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE 495 496export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 497export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 498export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN 499export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 500export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 501export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 502export KBUILD_ARFLAGS 503 504# Files to ignore in find ... statements 505 506export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 507 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 508 -prune -o 509export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 510 --exclude CVS --exclude .pc --exclude .hg --exclude .git 511 512# =========================================================================== 513# Rules shared between *config targets and build targets 514 515# Basic helpers built in scripts/basic/ 516PHONY += scripts_basic 517scripts_basic: 518 $(Q)$(MAKE) $(build)=scripts/basic 519 $(Q)rm -f .tmp_quiet_recordmcount 520 521PHONY += outputmakefile 522# Before starting out-of-tree build, make sure the source tree is clean. 523# outputmakefile generates a Makefile in the output directory, if using a 524# separate output directory. This allows convenient use of make in the 525# output directory. 526# At the same time when output Makefile generated, generate .gitignore to 527# ignore whole output directory 528outputmakefile: 529ifdef building_out_of_srctree 530 $(Q)if [ -f $(srctree)/.config -o \ 531 -d $(srctree)/include/config -o \ 532 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 533 echo >&2 "***"; \ 534 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 535 echo >&2 "*** in $(abs_srctree)";\ 536 echo >&2 "***"; \ 537 false; \ 538 fi 539 $(Q)ln -fsn $(srctree) source 540 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree) 541 $(Q)test -e .gitignore || \ 542 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 543endif 544 545ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),) 546ifneq ($(CROSS_COMPILE),) 547CLANG_FLAGS += --target=$(notdir $(CROSS_COMPILE:%-=%)) 548GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit)) 549CLANG_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR) 550GCC_TOOLCHAIN := $(realpath $(GCC_TOOLCHAIN_DIR)/..) 551endif 552ifneq ($(GCC_TOOLCHAIN),) 553CLANG_FLAGS += --gcc-toolchain=$(GCC_TOOLCHAIN) 554endif 555ifeq ($(shell $(AS) --version 2>&1 | head -n 1 | grep clang),) 556CLANG_FLAGS += -no-integrated-as 557endif 558CLANG_FLAGS += -Werror=unknown-warning-option 559KBUILD_CFLAGS += $(CLANG_FLAGS) 560KBUILD_AFLAGS += $(CLANG_FLAGS) 561export CLANG_FLAGS 562endif 563 564# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 565# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 566# CC_VERSION_TEXT is referenced from Kconfig (so it needs export), 567# and from include/config/auto.conf.cmd to detect the compiler upgrade. 568CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1) 569 570ifdef config-build 571# =========================================================================== 572# *config targets only - make sure prerequisites are updated, and descend 573# in scripts/kconfig to make the *config target 574 575# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 576# KBUILD_DEFCONFIG may point out an alternative default configuration 577# used for 'make defconfig' 578include arch/$(SRCARCH)/Makefile 579export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT 580 581config: outputmakefile scripts_basic FORCE 582 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 583 584%config: outputmakefile scripts_basic FORCE 585 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 586 587else #!config-build 588# =========================================================================== 589# Build targets only - this includes vmlinux, arch specific targets, clean 590# targets and others. In general all targets except *config targets. 591 592# If building an external module we do not care about the all: rule 593# but instead _all depend on modules 594PHONY += all 595ifeq ($(KBUILD_EXTMOD),) 596_all: all 597else 598_all: modules 599endif 600 601# Decide whether to build built-in, modular, or both. 602# Normally, just do built-in. 603 604KBUILD_MODULES := 605KBUILD_BUILTIN := 1 606 607# If we have only "make modules", don't compile built-in objects. 608# When we're building modules with modversions, we need to consider 609# the built-in objects during the descend as well, in order to 610# make sure the checksums are up to date before we record them. 611 612ifeq ($(MAKECMDGOALS),modules) 613 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1) 614endif 615 616# If we have "make <whatever> modules", compile modules 617# in addition to whatever we do anyway. 618# Just "make" or "make all" shall build modules as well 619 620ifneq ($(filter all _all modules,$(MAKECMDGOALS)),) 621 KBUILD_MODULES := 1 622endif 623 624ifeq ($(MAKECMDGOALS),) 625 KBUILD_MODULES := 1 626endif 627 628export KBUILD_MODULES KBUILD_BUILTIN 629 630ifdef need-config 631include include/config/auto.conf 632endif 633 634ifeq ($(KBUILD_EXTMOD),) 635# Objects we will link into vmlinux / subdirs we need to visit 636init-y := init/ 637drivers-y := drivers/ sound/ 638drivers-$(CONFIG_SAMPLES) += samples/ 639drivers-$(CONFIG_KERNEL_HEADER_TEST) += include/ 640net-y := net/ 641libs-y := lib/ 642core-y := usr/ 643virt-y := virt/ 644endif # KBUILD_EXTMOD 645 646# The all: target is the default when no target is given on the 647# command line. 648# This allow a user to issue only 'make' to build a kernel including modules 649# Defaults to vmlinux, but the arch makefile usually adds further targets 650all: vmlinux 651 652CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \ 653 $(call cc-option,-fno-tree-loop-im) \ 654 $(call cc-disable-warning,maybe-uninitialized,) 655export CFLAGS_GCOV 656 657# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 658ifdef CONFIG_FUNCTION_TRACER 659 CC_FLAGS_FTRACE := -pg 660endif 661 662RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register 663RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register 664RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk 665RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline 666RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG))) 667RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG))) 668export RETPOLINE_CFLAGS 669export RETPOLINE_VDSO_CFLAGS 670 671# The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default 672# values of the respective KBUILD_* variables 673ARCH_CPPFLAGS := 674ARCH_AFLAGS := 675ARCH_CFLAGS := 676include arch/$(SRCARCH)/Makefile 677 678ifdef need-config 679ifdef may-sync-config 680# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 681# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 682# because some architectures define CROSS_COMPILE there. 683include include/config/auto.conf.cmd 684 685$(KCONFIG_CONFIG): 686 @echo >&2 '***' 687 @echo >&2 '*** Configuration file "$@" not found!' 688 @echo >&2 '***' 689 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 690 @echo >&2 '*** "make menuconfig" or "make xconfig").' 691 @echo >&2 '***' 692 @/bin/false 693 694# The actual configuration files used during the build are stored in 695# include/generated/ and include/config/. Update them if .config is newer than 696# include/config/auto.conf (which mirrors .config). 697# 698# This exploits the 'multi-target pattern rule' trick. 699# The syncconfig should be executed only once to make all the targets. 700%/auto.conf %/auto.conf.cmd %/tristate.conf: $(KCONFIG_CONFIG) 701 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 702else # !may-sync-config 703# External modules and some install targets need include/generated/autoconf.h 704# and include/config/auto.conf but do not care if they are up-to-date. 705# Use auto.conf to trigger the test 706PHONY += include/config/auto.conf 707 708include/config/auto.conf: 709 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 710 echo >&2; \ 711 echo >&2 " ERROR: Kernel configuration is invalid."; \ 712 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 713 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 714 echo >&2 ; \ 715 /bin/false) 716 717endif # may-sync-config 718endif # need-config 719 720KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,) 721KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) 722KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) 723KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) 724KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) 725 726ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 727KBUILD_CFLAGS += -O2 728else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3 729KBUILD_CFLAGS += -O3 730else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 731KBUILD_CFLAGS += -Os 732endif 733 734ifdef CONFIG_CC_DISABLE_WARN_MAYBE_UNINITIALIZED 735KBUILD_CFLAGS += -Wno-maybe-uninitialized 736endif 737 738# Tell gcc to never replace conditional load with a non-conditional one 739KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 740 741include scripts/Makefile.kcov 742include scripts/Makefile.gcc-plugins 743 744ifdef CONFIG_READABLE_ASM 745# Disable optimizations that make assembler listings hard to read. 746# reorder blocks reorders the control in the function 747# ipa clone creates specialized cloned functions 748# partial inlining inlines only parts of functions 749KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \ 750 $(call cc-option,-fno-ipa-cp-clone,) \ 751 $(call cc-option,-fno-partial-inlining) 752endif 753 754ifneq ($(CONFIG_FRAME_WARN),0) 755KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN}) 756endif 757 758stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector 759stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 760stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 761 762KBUILD_CFLAGS += $(stackp-flags-y) 763 764ifdef CONFIG_CC_IS_CLANG 765KBUILD_CPPFLAGS += -Qunused-arguments 766KBUILD_CFLAGS += -Wno-format-invalid-specifier 767KBUILD_CFLAGS += -Wno-gnu 768# Quiet clang warning: comparison of unsigned expression < 0 is always false 769KBUILD_CFLAGS += -Wno-tautological-compare 770# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the 771# source of a reference will be _MergedGlobals and not on of the whitelisted names. 772# See modpost pattern 2 773KBUILD_CFLAGS += -mno-global-merge 774else 775 776# These warnings generated too much noise in a regular build. 777# Use make W=1 to enable them (see scripts/Makefile.extrawarn) 778KBUILD_CFLAGS += -Wno-unused-but-set-variable 779 780# Warn about unmarked fall-throughs in switch statement. 781# Disabled for clang while comment to attribute conversion happens and 782# https://github.com/ClangBuiltLinux/linux/issues/636 is discussed. 783KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough,) 784endif 785 786KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) 787ifdef CONFIG_FRAME_POINTER 788KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 789else 790# Some targets (ARM with Thumb2, for example), can't be built with frame 791# pointers. For those, we don't have FUNCTION_TRACER automatically 792# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 793# incompatible with -fomit-frame-pointer with current GCC, so we don't use 794# -fomit-frame-pointer with FUNCTION_TRACER. 795ifndef CONFIG_FUNCTION_TRACER 796KBUILD_CFLAGS += -fomit-frame-pointer 797endif 798endif 799 800# Initialize all stack variables with a pattern, if desired. 801ifdef CONFIG_INIT_STACK_ALL 802KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 803endif 804 805DEBUG_CFLAGS := $(call cc-option, -fno-var-tracking-assignments) 806 807ifdef CONFIG_DEBUG_INFO 808ifdef CONFIG_DEBUG_INFO_SPLIT 809DEBUG_CFLAGS += -gsplit-dwarf 810else 811DEBUG_CFLAGS += -g 812endif 813KBUILD_AFLAGS += -Wa,-gdwarf-2 814endif 815ifdef CONFIG_DEBUG_INFO_DWARF4 816DEBUG_CFLAGS += -gdwarf-4 817endif 818 819ifdef CONFIG_DEBUG_INFO_REDUCED 820DEBUG_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \ 821 $(call cc-option,-fno-var-tracking) 822endif 823 824KBUILD_CFLAGS += $(DEBUG_CFLAGS) 825export DEBUG_CFLAGS 826 827ifdef CONFIG_FUNCTION_TRACER 828ifdef CONFIG_FTRACE_MCOUNT_RECORD 829 # gcc 5 supports generating the mcount tables directly 830 ifeq ($(call cc-option-yn,-mrecord-mcount),y) 831 CC_FLAGS_FTRACE += -mrecord-mcount 832 export CC_USING_RECORD_MCOUNT := 1 833 endif 834 ifdef CONFIG_HAVE_NOP_MCOUNT 835 ifeq ($(call cc-option-yn, -mnop-mcount),y) 836 CC_FLAGS_FTRACE += -mnop-mcount 837 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 838 endif 839 endif 840endif 841ifdef CONFIG_HAVE_FENTRY 842 ifeq ($(call cc-option-yn, -mfentry),y) 843 CC_FLAGS_FTRACE += -mfentry 844 CC_FLAGS_USING += -DCC_USING_FENTRY 845 endif 846endif 847export CC_FLAGS_FTRACE 848KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 849KBUILD_AFLAGS += $(CC_FLAGS_USING) 850ifdef CONFIG_DYNAMIC_FTRACE 851 ifdef CONFIG_HAVE_C_RECORDMCOUNT 852 BUILD_C_RECORDMCOUNT := y 853 export BUILD_C_RECORDMCOUNT 854 endif 855endif 856endif 857 858# We trigger additional mismatches with less inlining 859ifdef CONFIG_DEBUG_SECTION_MISMATCH 860KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) 861endif 862 863ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 864KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 865LDFLAGS_vmlinux += --gc-sections 866endif 867 868ifdef CONFIG_LIVEPATCH 869KBUILD_CFLAGS += $(call cc-option, -flive-patching=inline-clone) 870endif 871 872# arch Makefile may override CC so keep this after arch Makefile is included 873NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) 874 875# warn about C99 declaration after statement 876KBUILD_CFLAGS += -Wdeclaration-after-statement 877 878# Variable Length Arrays (VLAs) should not be used anywhere in the kernel 879KBUILD_CFLAGS += -Wvla 880 881# disable pointer signed / unsigned warnings in gcc 4.0 882KBUILD_CFLAGS += -Wno-pointer-sign 883 884# disable stringop warnings in gcc 8+ 885KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation) 886 887# disable invalid "can't wrap" optimizations for signed / pointers 888KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow) 889 890# clang sets -fmerge-all-constants by default as optimization, but this 891# is non-conforming behavior for C and in fact breaks the kernel, so we 892# need to disable it here generally. 893KBUILD_CFLAGS += $(call cc-option,-fno-merge-all-constants) 894 895# for gcc -fno-merge-all-constants disables everything, but it is fine 896# to have actual conforming behavior enabled. 897KBUILD_CFLAGS += $(call cc-option,-fmerge-constants) 898 899# Make sure -fstack-check isn't enabled (like gentoo apparently did) 900KBUILD_CFLAGS += $(call cc-option,-fno-stack-check,) 901 902# conserve stack if available 903KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) 904 905# Prohibit date/time macros, which would make the build non-deterministic 906KBUILD_CFLAGS += $(call cc-option,-Werror=date-time) 907 908# enforce correct pointer usage 909KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 910 911# Require designated initializers for all marked structures 912KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) 913 914# change __FILE__ to the relative path from the srctree 915KBUILD_CFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 916 917# ensure -fcf-protection is disabled when using retpoline as it is 918# incompatible with -mindirect-branch=thunk-extern 919ifdef CONFIG_RETPOLINE 920KBUILD_CFLAGS += $(call cc-option,-fcf-protection=none) 921endif 922 923# use the deterministic mode of AR if available 924KBUILD_ARFLAGS := $(call ar-option,D) 925 926include scripts/Makefile.kasan 927include scripts/Makefile.extrawarn 928include scripts/Makefile.ubsan 929 930# Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the 931# last assignments 932KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS) 933KBUILD_AFLAGS += $(ARCH_AFLAGS) $(KAFLAGS) 934KBUILD_CFLAGS += $(ARCH_CFLAGS) $(KCFLAGS) 935 936KBUILD_LDFLAGS_MODULE += --build-id 937LDFLAGS_vmlinux += --build-id 938 939ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 940LDFLAGS_vmlinux += $(call ld-option, -X,) 941endif 942 943# insure the checker run with the right endianness 944CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 945 946# the checker needs the correct machine size 947CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 948 949# Default kernel image to build when no specific target is given. 950# KBUILD_IMAGE may be overruled on the command line or 951# set in the environment 952# Also any assignments in arch/$(ARCH)/Makefile take precedence over 953# this default value 954export KBUILD_IMAGE ?= vmlinux 955 956# 957# INSTALL_PATH specifies where to place the updated kernel and system map 958# images. Default is /boot, but you can set it to other values 959export INSTALL_PATH ?= /boot 960 961# 962# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 963# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 964# an argument if needed. Otherwise it defaults to the kernel install path 965# 966export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 967 968# 969# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 970# relocations required by build roots. This is not defined in the 971# makefile but the argument can be passed to make if needed. 972# 973 974MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 975export MODLIB 976 977# 978# INSTALL_MOD_STRIP, if defined, will cause modules to be 979# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then 980# the default option --strip-debug will be used. Otherwise, 981# INSTALL_MOD_STRIP value will be used as the options to the strip command. 982 983ifdef INSTALL_MOD_STRIP 984ifeq ($(INSTALL_MOD_STRIP),1) 985mod_strip_cmd = $(STRIP) --strip-debug 986else 987mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP) 988endif # INSTALL_MOD_STRIP=1 989else 990mod_strip_cmd = true 991endif # INSTALL_MOD_STRIP 992export mod_strip_cmd 993 994# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed 995# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP 996# or CONFIG_MODULE_COMPRESS_XZ. 997 998mod_compress_cmd = true 999ifdef CONFIG_MODULE_COMPRESS 1000 ifdef CONFIG_MODULE_COMPRESS_GZIP 1001 mod_compress_cmd = gzip -n -f 1002 endif # CONFIG_MODULE_COMPRESS_GZIP 1003 ifdef CONFIG_MODULE_COMPRESS_XZ 1004 mod_compress_cmd = xz -f 1005 endif # CONFIG_MODULE_COMPRESS_XZ 1006endif # CONFIG_MODULE_COMPRESS 1007export mod_compress_cmd 1008 1009ifdef CONFIG_MODULE_SIG_ALL 1010$(eval $(call config_filename,MODULE_SIG_KEY)) 1011 1012mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509 1013else 1014mod_sign_cmd = true 1015endif 1016export mod_sign_cmd 1017 1018HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf) 1019 1020ifdef CONFIG_STACK_VALIDATION 1021 has_libelf := $(call try-run,\ 1022 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0) 1023 ifeq ($(has_libelf),1) 1024 objtool_target := tools/objtool FORCE 1025 else 1026 SKIP_STACK_VALIDATION := 1 1027 export SKIP_STACK_VALIDATION 1028 endif 1029endif 1030 1031PHONY += prepare0 1032 1033export MODORDER := $(extmod-prefix)modules.order 1034 1035ifeq ($(KBUILD_EXTMOD),) 1036core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/ 1037 1038vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \ 1039 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 1040 $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y))) 1041 1042vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \ 1043 $(patsubst %/,%,$(filter %/, $(init-) $(core-) \ 1044 $(drivers-) $(net-) $(libs-) $(virt-)))) 1045 1046build-dirs := $(vmlinux-dirs) 1047clean-dirs := $(vmlinux-alldirs) 1048 1049init-y := $(patsubst %/, %/built-in.a, $(init-y)) 1050core-y := $(patsubst %/, %/built-in.a, $(core-y)) 1051drivers-y := $(patsubst %/, %/built-in.a, $(drivers-y)) 1052net-y := $(patsubst %/, %/built-in.a, $(net-y)) 1053libs-y1 := $(patsubst %/, %/lib.a, $(libs-y)) 1054libs-y2 := $(patsubst %/, %/built-in.a, $(filter-out %.a, $(libs-y))) 1055virt-y := $(patsubst %/, %/built-in.a, $(virt-y)) 1056 1057# Externally visible symbols (used by link-vmlinux.sh) 1058export KBUILD_VMLINUX_OBJS := $(head-y) $(init-y) $(core-y) $(libs-y2) \ 1059 $(drivers-y) $(net-y) $(virt-y) 1060export KBUILD_VMLINUX_LIBS := $(libs-y1) 1061export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1062export LDFLAGS_vmlinux 1063# used by scripts/package/Makefile 1064export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools) 1065 1066vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS) 1067 1068# Recurse until adjust_autoksyms.sh is satisfied 1069PHONY += autoksyms_recursive 1070ifdef CONFIG_TRIM_UNUSED_KSYMS 1071autoksyms_recursive: descend modules.order 1072 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ 1073 "$(MAKE) -f $(srctree)/Makefile vmlinux" 1074endif 1075 1076# For the kernel to actually contain only the needed exported symbols, 1077# we have to build modules as well to determine what those symbols are. 1078# (this can be evaluated only once include/config/auto.conf has been included) 1079ifdef CONFIG_TRIM_UNUSED_KSYMS 1080 KBUILD_MODULES := 1 1081endif 1082 1083autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h) 1084 1085$(autoksyms_h): 1086 $(Q)mkdir -p $(dir $@) 1087 $(Q)touch $@ 1088 1089ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink) 1090 1091# Final link of vmlinux with optional arch pass after final link 1092cmd_link-vmlinux = \ 1093 $(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ; \ 1094 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) 1095 1096vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE 1097 +$(call if_changed,link-vmlinux) 1098 1099targets := vmlinux 1100 1101# The actual objects are generated when descending, 1102# make sure no implicit rule kicks in 1103$(sort $(vmlinux-deps)): descend ; 1104 1105filechk_kernel.release = \ 1106 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1107 1108# Store (new) KERNELRELEASE string in include/config/kernel.release 1109include/config/kernel.release: FORCE 1110 $(call filechk,kernel.release) 1111 1112# Additional helpers built in scripts/ 1113# Carefully list dependencies so we do not try to build scripts twice 1114# in parallel 1115PHONY += scripts 1116scripts: scripts_basic scripts_dtc 1117 $(Q)$(MAKE) $(build)=$(@) 1118 1119# Things we need to do before we recursively start building the kernel 1120# or the modules are listed in "prepare". 1121# A multi level approach is used. prepareN is processed before prepareN-1. 1122# archprepare is used in arch Makefiles and when processed asm symlink, 1123# version.h and scripts_basic is processed / created. 1124 1125PHONY += prepare archprepare 1126 1127archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1128 asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h 1129 1130prepare0: archprepare 1131 $(Q)$(MAKE) $(build)=scripts/mod 1132 $(Q)$(MAKE) $(build)=. 1133 1134# All the preparing.. 1135prepare: prepare0 prepare-objtool 1136 1137# Support for using generic headers in asm-generic 1138asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj 1139 1140PHONY += asm-generic uapi-asm-generic 1141asm-generic: uapi-asm-generic 1142 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1143 generic=include/asm-generic 1144uapi-asm-generic: 1145 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1146 generic=include/uapi/asm-generic 1147 1148PHONY += prepare-objtool 1149prepare-objtool: $(objtool_target) 1150ifeq ($(SKIP_STACK_VALIDATION),1) 1151ifdef CONFIG_UNWINDER_ORC 1152 @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1153 @false 1154else 1155 @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1156endif 1157endif 1158 1159# Generate some files 1160# --------------------------------------------------------------------------- 1161 1162# KERNELRELEASE can change from a few different places, meaning version.h 1163# needs to be updated, so this check is forced on all builds 1164 1165uts_len := 64 1166define filechk_utsrelease.h 1167 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1168 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1169 exit 1; \ 1170 fi; \ 1171 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1172endef 1173 1174define filechk_version.h 1175 echo \#define LINUX_VERSION_CODE $(shell \ 1176 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \ 1177 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))' 1178endef 1179 1180$(version_h): FORCE 1181 $(call filechk,version.h) 1182 $(Q)rm -f $(old_version_h) 1183 1184include/generated/utsrelease.h: include/config/kernel.release FORCE 1185 $(call filechk,utsrelease.h) 1186 1187PHONY += headerdep 1188headerdep: 1189 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1190 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1191 1192# --------------------------------------------------------------------------- 1193# Kernel headers 1194 1195#Default location for installed headers 1196export INSTALL_HDR_PATH = $(objtree)/usr 1197 1198quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1199 cmd_headers_install = \ 1200 mkdir -p $(INSTALL_HDR_PATH); \ 1201 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1202 usr/include $(INSTALL_HDR_PATH) 1203 1204PHONY += headers_install 1205headers_install: headers 1206 $(call cmd,headers_install) 1207 1208PHONY += archheaders archscripts 1209 1210hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1211 1212PHONY += headers 1213headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts 1214 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \ 1215 $(error Headers not exportable for the $(SRCARCH) architecture)) 1216 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1217 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1218 1219PHONY += headers_check 1220headers_check: headers 1221 $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1 1222 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi HDRCHECK=1 1223 1224ifdef CONFIG_HEADERS_INSTALL 1225prepare: headers 1226endif 1227 1228ifdef CONFIG_HEADERS_CHECK 1229all: headers_check 1230endif 1231 1232PHONY += scripts_unifdef 1233scripts_unifdef: scripts_basic 1234 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1235 1236# --------------------------------------------------------------------------- 1237# Kernel selftest 1238 1239PHONY += kselftest 1240kselftest: 1241 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1242 1243PHONY += kselftest-clean 1244kselftest-clean: 1245 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean 1246 1247PHONY += kselftest-merge 1248kselftest-merge: 1249 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1250 $(Q)find $(srctree)/tools/testing/selftests -name config | \ 1251 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config 1252 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1253 1254# --------------------------------------------------------------------------- 1255# Devicetree files 1256 1257ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1258dtstree := arch/$(SRCARCH)/boot/dts 1259endif 1260 1261ifneq ($(dtstree),) 1262 1263%.dtb: include/config/kernel.release scripts_dtc 1264 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1265 1266PHONY += dtbs dtbs_install dt_binding_check 1267dtbs dtbs_check: include/config/kernel.release scripts_dtc 1268 $(Q)$(MAKE) $(build)=$(dtstree) 1269 1270dtbs_check: export CHECK_DTBS=1 1271dtbs_check: dt_binding_check 1272 1273dtbs_install: 1274 $(Q)$(MAKE) $(dtbinst)=$(dtstree) 1275 1276ifdef CONFIG_OF_EARLY_FLATTREE 1277all: dtbs 1278endif 1279 1280endif 1281 1282PHONY += scripts_dtc 1283scripts_dtc: scripts_basic 1284 $(Q)$(MAKE) $(build)=scripts/dtc 1285 1286dt_binding_check: scripts_dtc 1287 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings 1288 1289# --------------------------------------------------------------------------- 1290# Modules 1291 1292ifdef CONFIG_MODULES 1293 1294# By default, build modules as well 1295 1296all: modules 1297 1298# Build modules 1299# 1300# A module can be listed more than once in obj-m resulting in 1301# duplicate lines in modules.order files. Those are removed 1302# using awk while concatenating to the final file. 1303 1304PHONY += modules 1305modules: $(if $(KBUILD_BUILTIN),vmlinux) modules.order modules.builtin 1306 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1307 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh 1308 1309modules.order: descend 1310 $(Q)$(AWK) '!x[$$0]++' $(addsuffix /$@, $(build-dirs)) > $@ 1311 1312modbuiltin-dirs := $(addprefix _modbuiltin_, $(build-dirs)) 1313 1314modules.builtin: $(modbuiltin-dirs) 1315 $(Q)$(AWK) '!x[$$0]++' $(addsuffix /$@, $(build-dirs)) > $@ 1316 1317PHONY += $(modbuiltin-dirs) 1318# tristate.conf is not included from this Makefile. Add it as a prerequisite 1319# here to make it self-healing in case somebody accidentally removes it. 1320$(modbuiltin-dirs): include/config/tristate.conf 1321 $(Q)$(MAKE) $(modbuiltin)=$(patsubst _modbuiltin_%,%,$@) 1322 1323# Target to prepare building external modules 1324PHONY += modules_prepare 1325modules_prepare: prepare 1326 1327# Target to install modules 1328PHONY += modules_install 1329modules_install: _modinst_ _modinst_post 1330 1331PHONY += _modinst_ 1332_modinst_: 1333 @rm -rf $(MODLIB)/kernel 1334 @rm -f $(MODLIB)/source 1335 @mkdir -p $(MODLIB)/kernel 1336 @ln -s $(abspath $(srctree)) $(MODLIB)/source 1337 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1338 rm -f $(MODLIB)/build ; \ 1339 ln -s $(CURDIR) $(MODLIB)/build ; \ 1340 fi 1341 @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order 1342 @sed 's:^:kernel/:' modules.builtin > $(MODLIB)/modules.builtin 1343 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/ 1344 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1345 1346# This depmod is only for convenience to give the initial 1347# boot a modules.dep even before / is mounted read-write. However the 1348# boot script depmod is the master version. 1349PHONY += _modinst_post 1350_modinst_post: _modinst_ 1351 $(call cmd,depmod) 1352 1353ifeq ($(CONFIG_MODULE_SIG), y) 1354PHONY += modules_sign 1355modules_sign: 1356 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign 1357endif 1358 1359else # CONFIG_MODULES 1360 1361# Modules not configured 1362# --------------------------------------------------------------------------- 1363 1364PHONY += modules modules_install 1365modules modules_install: 1366 @echo >&2 1367 @echo >&2 "The present kernel configuration has modules disabled." 1368 @echo >&2 "Type 'make config' and enable loadable module support." 1369 @echo >&2 "Then build a kernel with module support enabled." 1370 @echo >&2 1371 @exit 1 1372 1373endif # CONFIG_MODULES 1374 1375### 1376# Cleaning is done on three levels. 1377# make clean Delete most generated files 1378# Leave enough to build external modules 1379# make mrproper Delete the current configuration, and all generated files 1380# make distclean Remove editor backup files, patch leftover files and the like 1381 1382# Directories & files removed with 'make clean' 1383CLEAN_DIRS += include/ksym 1384CLEAN_FILES += modules.builtin.modinfo 1385 1386# Directories & files removed with 'make mrproper' 1387MRPROPER_DIRS += include/config include/generated \ 1388 arch/$(SRCARCH)/include/generated .tmp_objdiff \ 1389 debian/ snap/ tar-install/ 1390MRPROPER_FILES += .config .config.old .version \ 1391 Module.symvers \ 1392 signing_key.pem signing_key.priv signing_key.x509 \ 1393 x509.genkey extra_certificates signing_key.x509.keyid \ 1394 signing_key.x509.signer vmlinux-gdb.py \ 1395 *.spec 1396 1397# Directories & files removed with 'make distclean' 1398DISTCLEAN_DIRS += 1399DISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS 1400 1401# clean - Delete most, but leave enough to build external modules 1402# 1403clean: rm-dirs := $(CLEAN_DIRS) 1404clean: rm-files := $(CLEAN_FILES) 1405 1406PHONY += archclean vmlinuxclean 1407 1408vmlinuxclean: 1409 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1410 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1411 1412clean: archclean vmlinuxclean 1413 1414# mrproper - Delete all generated files, including .config 1415# 1416mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS)) 1417mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1418mrproper-dirs := $(addprefix _mrproper_,scripts) 1419 1420PHONY += $(mrproper-dirs) mrproper 1421$(mrproper-dirs): 1422 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1423 1424mrproper: clean $(mrproper-dirs) 1425 $(call cmd,rmdirs) 1426 $(call cmd,rmfiles) 1427 1428# distclean 1429# 1430distclean: rm-dirs := $(wildcard $(DISTCLEAN_DIRS)) 1431distclean: rm-files := $(wildcard $(DISTCLEAN_FILES)) 1432 1433PHONY += distclean 1434 1435distclean: mrproper 1436 $(call cmd,rmdirs) 1437 $(call cmd,rmfiles) 1438 @find $(srctree) $(RCS_FIND_IGNORE) \ 1439 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1440 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1441 -o -name 'core' \) \ 1442 -type f -print | xargs rm -f 1443 1444 1445# Packaging of the kernel to various formats 1446# --------------------------------------------------------------------------- 1447 1448%src-pkg: FORCE 1449 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1450%pkg: include/config/kernel.release FORCE 1451 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1452 1453# Brief documentation of the typical targets used 1454# --------------------------------------------------------------------------- 1455 1456boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1457boards := $(sort $(notdir $(boards))) 1458board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1459board-dirs := $(sort $(notdir $(board-dirs:/=))) 1460 1461PHONY += help 1462help: 1463 @echo 'Cleaning targets:' 1464 @echo ' clean - Remove most generated files but keep the config and' 1465 @echo ' enough build support to build external modules' 1466 @echo ' mrproper - Remove all generated files + config + various backup files' 1467 @echo ' distclean - mrproper + remove editor backup and patch files' 1468 @echo '' 1469 @echo 'Configuration targets:' 1470 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1471 @echo '' 1472 @echo 'Other generic targets:' 1473 @echo ' all - Build all targets marked with [*]' 1474 @echo '* vmlinux - Build the bare kernel' 1475 @echo '* modules - Build all modules' 1476 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1477 @echo ' dir/ - Build all files in dir and below' 1478 @echo ' dir/file.[ois] - Build specified target only' 1479 @echo ' dir/file.ll - Build the LLVM assembly file' 1480 @echo ' (requires compiler support for LLVM assembly generation)' 1481 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1482 @echo ' (requires a recent binutils and recent build (System.map))' 1483 @echo ' dir/file.ko - Build module including final link' 1484 @echo ' modules_prepare - Set up for building external modules' 1485 @echo ' tags/TAGS - Generate tags file for editors' 1486 @echo ' cscope - Generate cscope index' 1487 @echo ' gtags - Generate GNU GLOBAL index' 1488 @echo ' kernelrelease - Output the release version string (use with make -s)' 1489 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1490 @echo ' image_name - Output the image name (use with make -s)' 1491 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1492 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1493 echo '' 1494 @echo 'Static analysers:' 1495 @echo ' checkstack - Generate a list of stack hogs' 1496 @echo ' namespacecheck - Name space analysis on compiled kernel' 1497 @echo ' versioncheck - Sanity check on version.h usage' 1498 @echo ' includecheck - Check for duplicate included header files' 1499 @echo ' export_report - List the usages of all exported symbols' 1500 @echo ' headers_check - Sanity check on exported headers' 1501 @echo ' headerdep - Detect inclusion cycles in headers' 1502 @echo ' coccicheck - Check with Coccinelle' 1503 @echo '' 1504 @echo 'Kernel selftest:' 1505 @echo ' kselftest - Build and run kernel selftest (run as root)' 1506 @echo ' Build, install, and boot kernel before' 1507 @echo ' running kselftest on it' 1508 @echo ' kselftest-clean - Remove all generated kselftest files' 1509 @echo ' kselftest-merge - Merge all the config dependencies of kselftest to existing' 1510 @echo ' .config.' 1511 @echo '' 1512 @$(if $(dtstree), \ 1513 echo 'Devicetree:'; \ 1514 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1515 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1516 echo '') 1517 1518 @echo 'Userspace tools targets:' 1519 @echo ' use "make tools/help"' 1520 @echo ' or "cd tools; make help"' 1521 @echo '' 1522 @echo 'Kernel packaging:' 1523 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1524 @echo '' 1525 @echo 'Documentation targets:' 1526 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1527 @echo '' 1528 @echo 'Architecture specific targets ($(SRCARCH)):' 1529 @$(if $(archhelp),$(archhelp),\ 1530 echo ' No architecture specific help defined for $(SRCARCH)') 1531 @echo '' 1532 @$(if $(boards), \ 1533 $(foreach b, $(boards), \ 1534 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1535 echo '') 1536 @$(if $(board-dirs), \ 1537 $(foreach b, $(board-dirs), \ 1538 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1539 printf " %-16s - Show all of the above\\n" help-boards; \ 1540 echo '') 1541 1542 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1543 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1544 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1545 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK (sparse by default)' 1546 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1547 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1548 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where' 1549 @echo ' 1: warnings which may be relevant and do not occur too often' 1550 @echo ' 2: warnings which occur quite often but may still be relevant' 1551 @echo ' 3: more obscure warnings, can most likely be ignored' 1552 @echo ' Multiple levels can be combined with W=12 or W=123' 1553 @echo '' 1554 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1555 @echo 'For further info see the ./README file' 1556 1557 1558help-board-dirs := $(addprefix help-,$(board-dirs)) 1559 1560help-boards: $(help-board-dirs) 1561 1562boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1563 1564$(help-board-dirs): help-%: 1565 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1566 @$(if $(boards-per-dir), \ 1567 $(foreach b, $(boards-per-dir), \ 1568 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1569 echo '') 1570 1571 1572# Documentation targets 1573# --------------------------------------------------------------------------- 1574DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1575 linkcheckdocs dochelp refcheckdocs 1576PHONY += $(DOC_TARGETS) 1577$(DOC_TARGETS): 1578 $(Q)$(MAKE) $(build)=Documentation $@ 1579 1580# Misc 1581# --------------------------------------------------------------------------- 1582 1583PHONY += scripts_gdb 1584scripts_gdb: prepare0 1585 $(Q)$(MAKE) $(build)=scripts/gdb 1586 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1587 1588ifdef CONFIG_GDB_SCRIPTS 1589all: scripts_gdb 1590endif 1591 1592else # KBUILD_EXTMOD 1593 1594### 1595# External module support. 1596# When building external modules the kernel used as basis is considered 1597# read-only, and no consistency checks are made and the make 1598# system is not used on the basis kernel. If updates are required 1599# in the basis kernel ordinary make commands (without M=...) must 1600# be used. 1601# 1602# The following are the only valid targets when building external 1603# modules. 1604# make M=dir clean Delete all automatically generated files 1605# make M=dir modules Make all modules in specified dir 1606# make M=dir Same as 'make M=dir modules' 1607# make M=dir modules_install 1608# Install the modules built in the module directory 1609# Assumes install directory is already created 1610 1611# We are always building modules 1612KBUILD_MODULES := 1 1613 1614PHONY += $(objtree)/Module.symvers 1615$(objtree)/Module.symvers: 1616 @test -e $(objtree)/Module.symvers || ( \ 1617 echo; \ 1618 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \ 1619 echo " is missing; modules will have no dependencies and modversions."; \ 1620 echo ) 1621 1622build-dirs := $(KBUILD_EXTMOD) 1623PHONY += modules 1624modules: descend $(objtree)/Module.symvers 1625 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1626 1627PHONY += modules_install 1628modules_install: _emodinst_ _emodinst_post 1629 1630install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra) 1631PHONY += _emodinst_ 1632_emodinst_: 1633 $(Q)mkdir -p $(MODLIB)/$(install-dir) 1634 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1635 1636PHONY += _emodinst_post 1637_emodinst_post: _emodinst_ 1638 $(call cmd,depmod) 1639 1640clean-dirs := $(KBUILD_EXTMOD) 1641clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers 1642 1643PHONY += / 1644/: 1645 @echo >&2 '"$(MAKE) /" is no longer supported. Please use "$(MAKE) ./" instead.' 1646 1647PHONY += help 1648help: 1649 @echo ' Building external modules.' 1650 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1651 @echo '' 1652 @echo ' modules - default target, build the module(s)' 1653 @echo ' modules_install - install the module' 1654 @echo ' clean - remove generated files in module directory only' 1655 @echo '' 1656 1657PHONY += prepare 1658endif # KBUILD_EXTMOD 1659 1660# Handle descending into subdirectories listed in $(build-dirs) 1661# Preset locale variables to speed up the build process. Limit locale 1662# tweaks to this spot to avoid wrong language settings when running 1663# make menuconfig etc. 1664# Error messages still appears in the original language 1665PHONY += descend $(build-dirs) 1666descend: $(build-dirs) 1667$(build-dirs): prepare 1668 $(Q)$(MAKE) $(build)=$@ single-build=$(single-build) need-builtin=1 need-modorder=1 1669 1670clean-dirs := $(addprefix _clean_, $(clean-dirs)) 1671PHONY += $(clean-dirs) clean 1672$(clean-dirs): 1673 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1674 1675clean: $(clean-dirs) 1676 $(call cmd,rmdirs) 1677 $(call cmd,rmfiles) 1678 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1679 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \ 1680 -o -name '*.ko.*' \ 1681 -o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \ 1682 -o -name '*.dwo' -o -name '*.lst' \ 1683 -o -name '*.su' -o -name '*.mod' \ 1684 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1685 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 1686 -o -name '*.asn1.[ch]' \ 1687 -o -name '*.symtypes' -o -name 'modules.order' \ 1688 -o -name modules.builtin -o -name '.tmp_*.o.*' \ 1689 -o -name '*.c.[012]*.*' \ 1690 -o -name '*.ll' \ 1691 -o -name '*.gcno' \) -type f -print | xargs rm -f 1692 1693# Generate tags for editors 1694# --------------------------------------------------------------------------- 1695quiet_cmd_tags = GEN $@ 1696 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@ 1697 1698tags TAGS cscope gtags: FORCE 1699 $(call cmd,tags) 1700 1701# Scripts to check various things for consistency 1702# --------------------------------------------------------------------------- 1703 1704PHONY += includecheck versioncheck coccicheck namespacecheck export_report 1705 1706includecheck: 1707 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1708 -name '*.[hcS]' -type f -print | sort \ 1709 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1710 1711versioncheck: 1712 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1713 -name '*.[hcS]' -type f -print | sort \ 1714 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1715 1716coccicheck: 1717 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@ 1718 1719namespacecheck: 1720 $(PERL) $(srctree)/scripts/namespace.pl 1721 1722export_report: 1723 $(PERL) $(srctree)/scripts/export_report.pl 1724 1725PHONY += checkstack kernelrelease kernelversion image_name 1726 1727# UML needs a little special treatment here. It wants to use the host 1728# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1729# else wants $(ARCH), including people doing cross-builds, which means 1730# that $(SUBARCH) doesn't work here. 1731ifeq ($(ARCH), um) 1732CHECKSTACK_ARCH := $(SUBARCH) 1733else 1734CHECKSTACK_ARCH := $(ARCH) 1735endif 1736checkstack: 1737 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1738 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1739 1740kernelrelease: 1741 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1742 1743kernelversion: 1744 @echo $(KERNELVERSION) 1745 1746image_name: 1747 @echo $(KBUILD_IMAGE) 1748 1749# Clear a bunch of variables before executing the submake 1750 1751ifeq ($(quiet),silent_) 1752tools_silent=s 1753endif 1754 1755tools/: FORCE 1756 $(Q)mkdir -p $(objtree)/tools 1757 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1758 1759tools/%: FORCE 1760 $(Q)mkdir -p $(objtree)/tools 1761 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1762 1763# Single targets 1764# --------------------------------------------------------------------------- 1765# To build individual files in subdirectories, you can do like this: 1766# 1767# make foo/bar/baz.s 1768# 1769# The supported suffixes for single-target are listed in 'single-targets' 1770# 1771# To build only under specific subdirectories, you can do like this: 1772# 1773# make foo/bar/baz/ 1774 1775ifdef single-build 1776 1777single-all := $(filter $(single-targets), $(MAKECMDGOALS)) 1778 1779# .ko is special because modpost is needed 1780single-ko := $(sort $(filter %.ko, $(single-all))) 1781single-no-ko := $(sort $(patsubst %.ko,%.mod, $(single-all))) 1782 1783$(single-ko): single_modpost 1784 @: 1785$(single-no-ko): descend 1786 @: 1787 1788ifeq ($(KBUILD_EXTMOD),) 1789# For the single build of in-tree modules, use a temporary file to avoid 1790# the situation of modules_install installing an invalid modules.order. 1791MODORDER := .modules.tmp 1792endif 1793 1794PHONY += single_modpost 1795single_modpost: $(single-no-ko) 1796 $(Q){ $(foreach m, $(single-ko), echo $(extmod-prefix)$m;) } > $(MODORDER) 1797 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1798 1799KBUILD_MODULES := 1 1800 1801export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod-prefix), $(single-no-ko)) 1802 1803single-build = $(if $(filter-out $@/, $(single-no-ko)),1) 1804 1805endif 1806 1807# FIXME Should go into a make.lib or something 1808# =========================================================================== 1809 1810quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs))) 1811 cmd_rmdirs = rm -rf $(rm-dirs) 1812 1813quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1814 cmd_rmfiles = rm -f $(rm-files) 1815 1816# Run depmod only if we have System.map and depmod is executable 1817quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) 1818 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1819 $(KERNELRELEASE) 1820 1821# read saved command lines for existing targets 1822existing-targets := $(wildcard $(sort $(targets))) 1823 1824-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 1825 1826endif # config-targets 1827endif # mixed-build 1828endif # need-sub-make 1829 1830PHONY += FORCE 1831FORCE: 1832 1833# Declare the contents of the PHONY variable as phony. We keep that 1834# information in a variable so we can use it in if_changed and friends. 1835.PHONY: $(PHONY) 1836