1# SPDX-License-Identifier: GPL-2.0 2VERSION = 4 3PATCHLEVEL = 18 4SUBLEVEL = 0 5EXTRAVERSION = -rc5 6NAME = Merciless Moray 7 8# *DOCUMENTATION* 9# To see a list of typical targets execute "make help" 10# More info can be located in ./README 11# Comments in this file are targeted only to the developer, do not 12# expect to learn how to build the kernel reading this file. 13 14# That's our default target when none is given on the command line 15PHONY := _all 16_all: 17 18# o Do not use make's built-in rules and variables 19# (this increases performance and avoids hard-to-debug behaviour); 20# o Look for make include files relative to root of kernel src 21MAKEFLAGS += -rR --include-dir=$(CURDIR) 22 23# Avoid funny character set dependencies 24unexport LC_ALL 25LC_COLLATE=C 26LC_NUMERIC=C 27export LC_COLLATE LC_NUMERIC 28 29# Avoid interference with shell env settings 30unexport GREP_OPTIONS 31 32# We are using a recursive build, so we need to do a little thinking 33# to get the ordering right. 34# 35# Most importantly: sub-Makefiles should only ever modify files in 36# their own directory. If in some directory we have a dependency on 37# a file in another dir (which doesn't happen often, but it's often 38# unavoidable when linking the built-in.a targets which finally 39# turn into vmlinux), we will call a sub make in that other dir, and 40# after that we are sure that everything which is in that other dir 41# is now up to date. 42# 43# The only cases where we need to modify files which have global 44# effects are thus separated out and done before the recursive 45# descending is started. They are now explicitly listed as the 46# prepare rule. 47 48# Beautify output 49# --------------------------------------------------------------------------- 50# 51# Normally, we echo the whole command before executing it. By making 52# that echo $($(quiet)$(cmd)), we now have the possibility to set 53# $(quiet) to choose other forms of output instead, e.g. 54# 55# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@ 56# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< 57# 58# If $(quiet) is empty, the whole command will be printed. 59# If it is set to "quiet_", only the short version will be printed. 60# If it is set to "silent_", nothing will be printed at all, since 61# the variable $(silent_cmd_cc_o_c) doesn't exist. 62# 63# A simple variant is to prefix commands with $(Q) - that's useful 64# for commands that shall be hidden in non-verbose mode. 65# 66# $(Q)ln $@ :< 67# 68# If KBUILD_VERBOSE equals 0 then the above command will be hidden. 69# If KBUILD_VERBOSE equals 1 then the above command is displayed. 70# 71# To put more focus on warnings, be less verbose as default 72# Use 'make V=1' to see the full commands 73 74ifeq ("$(origin V)", "command line") 75 KBUILD_VERBOSE = $(V) 76endif 77ifndef KBUILD_VERBOSE 78 KBUILD_VERBOSE = 0 79endif 80 81ifeq ($(KBUILD_VERBOSE),1) 82 quiet = 83 Q = 84else 85 quiet=quiet_ 86 Q = @ 87endif 88 89# If the user is running make -s (silent mode), suppress echoing of 90# commands 91 92ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),) 93 quiet=silent_ 94 tools_silent=s 95endif 96 97export quiet Q KBUILD_VERBOSE 98 99# kbuild supports saving output files in a separate directory. 100# To locate output files in a separate directory two syntaxes are supported. 101# In both cases the working directory must be the root of the kernel src. 102# 1) O= 103# Use "make O=dir/to/store/output/files/" 104# 105# 2) Set KBUILD_OUTPUT 106# Set the environment variable KBUILD_OUTPUT to point to the directory 107# where the output files shall be placed. 108# export KBUILD_OUTPUT=dir/to/store/output/files/ 109# make 110# 111# The O= assignment takes precedence over the KBUILD_OUTPUT environment 112# variable. 113 114# KBUILD_SRC is not intended to be used by the regular user (for now), 115# it is set on invocation of make with KBUILD_OUTPUT or O= specified. 116ifeq ($(KBUILD_SRC),) 117 118# OK, Make called in directory where kernel src resides 119# Do we want to locate output files in a separate directory? 120ifeq ("$(origin O)", "command line") 121 KBUILD_OUTPUT := $(O) 122endif 123 124# Cancel implicit rules on top Makefile 125$(CURDIR)/Makefile Makefile: ; 126 127ifneq ($(words $(subst :, ,$(CURDIR))), 1) 128 $(error main directory cannot contain spaces nor colons) 129endif 130 131ifneq ($(KBUILD_OUTPUT),) 132# check that the output directory actually exists 133saved-output := $(KBUILD_OUTPUT) 134KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \ 135 && pwd) 136$(if $(KBUILD_OUTPUT),, \ 137 $(error failed to create output directory "$(saved-output)")) 138 139PHONY += $(MAKECMDGOALS) sub-make 140 141$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make 142 @: 143 144# Invoke a second make in the output directory, passing relevant variables 145sub-make: 146 $(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \ 147 -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS)) 148 149# Leave processing to above invocation of make 150skip-makefile := 1 151endif # ifneq ($(KBUILD_OUTPUT),) 152endif # ifeq ($(KBUILD_SRC),) 153 154# We process the rest of the Makefile if this is the final invocation of make 155ifeq ($(skip-makefile),) 156 157# Do not print "Entering directory ...", 158# but we want to display it when entering to the output directory 159# so that IDEs/editors are able to understand relative filenames. 160MAKEFLAGS += --no-print-directory 161 162# Call a source code checker (by default, "sparse") as part of the 163# C compilation. 164# 165# Use 'make C=1' to enable checking of only re-compiled files. 166# Use 'make C=2' to enable checking of *all* source files, regardless 167# of whether they are re-compiled or not. 168# 169# See the file "Documentation/dev-tools/sparse.rst" for more details, 170# including where to get the "sparse" utility. 171 172ifeq ("$(origin C)", "command line") 173 KBUILD_CHECKSRC = $(C) 174endif 175ifndef KBUILD_CHECKSRC 176 KBUILD_CHECKSRC = 0 177endif 178 179# Use make M=dir to specify directory of external module to build 180# Old syntax make ... SUBDIRS=$PWD is still supported 181# Setting the environment variable KBUILD_EXTMOD take precedence 182ifdef SUBDIRS 183 KBUILD_EXTMOD ?= $(SUBDIRS) 184endif 185 186ifeq ("$(origin M)", "command line") 187 KBUILD_EXTMOD := $(M) 188endif 189 190ifeq ($(KBUILD_SRC),) 191 # building in the source tree 192 srctree := . 193else 194 ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR))) 195 # building in a subdirectory of the source tree 196 srctree := .. 197 else 198 srctree := $(KBUILD_SRC) 199 endif 200endif 201 202export KBUILD_CHECKSRC KBUILD_EXTMOD KBUILD_SRC 203 204objtree := . 205src := $(srctree) 206obj := $(objtree) 207 208VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD)) 209 210export srctree objtree VPATH 211 212# To make sure we do not include .config for any of the *config targets 213# catch them early, and hand them over to scripts/kconfig/Makefile 214# It is allowed to specify more targets when calling make, including 215# mixing *config targets and build targets. 216# For example 'make oldconfig all'. 217# Detect when mixed targets is specified, and make a second invocation 218# of make so .config is not included in this case either (for *config). 219 220version_h := include/generated/uapi/linux/version.h 221old_version_h := include/linux/version.h 222 223clean-targets := %clean mrproper cleandocs 224no-dot-config-targets := $(clean-targets) \ 225 cscope gtags TAGS tags help% %docs check% coccicheck \ 226 $(version_h) headers_% archheaders archscripts \ 227 %asm-generic kernelversion %src-pkg 228 229config-targets := 0 230mixed-targets := 0 231dot-config := 1 232 233ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 234 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 235 dot-config := 0 236 endif 237endif 238 239ifeq ($(KBUILD_EXTMOD),) 240 ifneq ($(filter config %config,$(MAKECMDGOALS)),) 241 config-targets := 1 242 ifneq ($(words $(MAKECMDGOALS)),1) 243 mixed-targets := 1 244 endif 245 endif 246endif 247 248# For "make -j clean all", "make -j mrproper defconfig all", etc. 249ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),) 250 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) 251 mixed-targets := 1 252 endif 253endif 254 255# install and modules_install need also be processed one by one 256ifneq ($(filter install,$(MAKECMDGOALS)),) 257 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 258 mixed-targets := 1 259 endif 260endif 261 262ifeq ($(mixed-targets),1) 263# =========================================================================== 264# We're called with mixed targets (*config and build targets). 265# Handle them one by one. 266 267PHONY += $(MAKECMDGOALS) __build_one_by_one 268 269$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one 270 @: 271 272__build_one_by_one: 273 $(Q)set -e; \ 274 for i in $(MAKECMDGOALS); do \ 275 $(MAKE) -f $(srctree)/Makefile $$i; \ 276 done 277 278else 279 280# We need some generic definitions (do not try to remake the file). 281scripts/Kbuild.include: ; 282include scripts/Kbuild.include 283 284# Read KERNELRELEASE from include/config/kernel.release (if it exists) 285KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null) 286KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 287export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 288 289# SUBARCH tells the usermode build what the underlying arch is. That is set 290# first, and if a usermode build is happening, the "ARCH=um" on the command 291# line overrides the setting of ARCH below. If a native build is happening, 292# then ARCH is assigned, getting whatever value it gets normally, and 293# SUBARCH is subsequently ignored. 294 295SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \ 296 -e s/sun4u/sparc64/ \ 297 -e s/arm.*/arm/ -e s/sa110/arm/ \ 298 -e s/s390x/s390/ -e s/parisc64/parisc/ \ 299 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \ 300 -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ \ 301 -e s/riscv.*/riscv/) 302 303# Cross compiling and selecting different set of gcc/bin-utils 304# --------------------------------------------------------------------------- 305# 306# When performing cross compilation for other architectures ARCH shall be set 307# to the target architecture. (See arch/* for the possibilities). 308# ARCH can be set during invocation of make: 309# make ARCH=ia64 310# Another way is to have ARCH set in the environment. 311# The default ARCH is the host where make is executed. 312 313# CROSS_COMPILE specify the prefix used for all executables used 314# during compilation. Only gcc and related bin-utils executables 315# are prefixed with $(CROSS_COMPILE). 316# CROSS_COMPILE can be set on the command line 317# make CROSS_COMPILE=ia64-linux- 318# Alternatively CROSS_COMPILE can be set in the environment. 319# Default value for CROSS_COMPILE is not to prefix executables 320# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 321ARCH ?= $(SUBARCH) 322 323# Architecture as present in compile.h 324UTS_MACHINE := $(ARCH) 325SRCARCH := $(ARCH) 326 327# Additional ARCH settings for x86 328ifeq ($(ARCH),i386) 329 SRCARCH := x86 330endif 331ifeq ($(ARCH),x86_64) 332 SRCARCH := x86 333endif 334 335# Additional ARCH settings for sparc 336ifeq ($(ARCH),sparc32) 337 SRCARCH := sparc 338endif 339ifeq ($(ARCH),sparc64) 340 SRCARCH := sparc 341endif 342 343# Additional ARCH settings for sh 344ifeq ($(ARCH),sh64) 345 SRCARCH := sh 346endif 347 348KCONFIG_CONFIG ?= .config 349export KCONFIG_CONFIG 350 351# SHELL used by kbuild 352CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \ 353 else if [ -x /bin/bash ]; then echo /bin/bash; \ 354 else echo sh; fi ; fi) 355 356HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null) 357HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null) 358HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null) 359 360HOSTCC = gcc 361HOSTCXX = g++ 362KBUILD_HOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \ 363 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) \ 364 $(HOSTCFLAGS) 365KBUILD_HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) 366KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 367KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 368 369# Make variables (CC, etc...) 370AS = $(CROSS_COMPILE)as 371LD = $(CROSS_COMPILE)ld 372CC = $(CROSS_COMPILE)gcc 373CPP = $(CC) -E 374AR = $(CROSS_COMPILE)ar 375NM = $(CROSS_COMPILE)nm 376STRIP = $(CROSS_COMPILE)strip 377OBJCOPY = $(CROSS_COMPILE)objcopy 378OBJDUMP = $(CROSS_COMPILE)objdump 379LEX = flex 380YACC = bison 381AWK = awk 382GENKSYMS = scripts/genksyms/genksyms 383INSTALLKERNEL := installkernel 384DEPMOD = /sbin/depmod 385PERL = perl 386PYTHON = python 387PYTHON2 = python2 388PYTHON3 = python3 389CHECK = sparse 390 391CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 392 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 393NOSTDINC_FLAGS = 394CFLAGS_MODULE = 395AFLAGS_MODULE = 396LDFLAGS_MODULE = 397CFLAGS_KERNEL = 398AFLAGS_KERNEL = 399LDFLAGS_vmlinux = 400 401# Use USERINCLUDE when you must reference the UAPI directories only. 402USERINCLUDE := \ 403 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 404 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 405 -I$(srctree)/include/uapi \ 406 -I$(objtree)/include/generated/uapi \ 407 -include $(srctree)/include/linux/kconfig.h 408 409# Use LINUXINCLUDE when you must reference the include/ directory. 410# Needed to be compatible with the O= option 411LINUXINCLUDE := \ 412 -I$(srctree)/arch/$(SRCARCH)/include \ 413 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 414 $(if $(KBUILD_SRC), -I$(srctree)/include) \ 415 -I$(objtree)/include \ 416 $(USERINCLUDE) 417 418KBUILD_AFLAGS := -D__ASSEMBLY__ 419KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \ 420 -fno-strict-aliasing -fno-common -fshort-wchar \ 421 -Werror-implicit-function-declaration \ 422 -Wno-format-security \ 423 -std=gnu89 424KBUILD_CPPFLAGS := -D__KERNEL__ 425KBUILD_AFLAGS_KERNEL := 426KBUILD_CFLAGS_KERNEL := 427KBUILD_AFLAGS_MODULE := -DMODULE 428KBUILD_CFLAGS_MODULE := -DMODULE 429KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds 430LDFLAGS := 431GCC_PLUGINS_CFLAGS := 432 433export ARCH SRCARCH CONFIG_SHELL HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE AS LD CC 434export CPP AR NM STRIP OBJCOPY OBJDUMP KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS 435export MAKE LEX YACC AWK GENKSYMS INSTALLKERNEL PERL PYTHON PYTHON2 PYTHON3 UTS_MACHINE 436export HOSTCXX KBUILD_HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS 437 438export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS 439export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 440export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN 441export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 442export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 443export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 444export KBUILD_ARFLAGS 445 446# When compiling out-of-tree modules, put MODVERDIR in the module 447# tree rather than in the kernel tree. The kernel tree might 448# even be read-only. 449export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions 450 451# Files to ignore in find ... statements 452 453export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 454 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 455 -prune -o 456export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 457 --exclude CVS --exclude .pc --exclude .hg --exclude .git 458 459# =========================================================================== 460# Rules shared between *config targets and build targets 461 462# Basic helpers built in scripts/basic/ 463PHONY += scripts_basic 464scripts_basic: 465 $(Q)$(MAKE) $(build)=scripts/basic 466 $(Q)rm -f .tmp_quiet_recordmcount 467 468# To avoid any implicit rule to kick in, define an empty command. 469scripts/basic/%: scripts_basic ; 470 471PHONY += outputmakefile 472# outputmakefile generates a Makefile in the output directory, if using a 473# separate output directory. This allows convenient use of make in the 474# output directory. 475outputmakefile: 476ifneq ($(KBUILD_SRC),) 477 $(Q)ln -fsn $(srctree) source 478 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \ 479 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL) 480endif 481 482ifeq ($(cc-name),clang) 483ifneq ($(CROSS_COMPILE),) 484CLANG_TARGET := --target=$(notdir $(CROSS_COMPILE:%-=%)) 485GCC_TOOLCHAIN := $(realpath $(dir $(shell which $(LD)))/..) 486endif 487ifneq ($(GCC_TOOLCHAIN),) 488CLANG_GCC_TC := --gcc-toolchain=$(GCC_TOOLCHAIN) 489endif 490KBUILD_CFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC) 491KBUILD_AFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC) 492KBUILD_CFLAGS += $(call cc-option, -no-integrated-as) 493KBUILD_AFLAGS += $(call cc-option, -no-integrated-as) 494endif 495 496RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register 497RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk 498RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG))) 499export RETPOLINE_CFLAGS 500 501KBUILD_CFLAGS += $(call cc-option,-fno-PIE) 502KBUILD_AFLAGS += $(call cc-option,-fno-PIE) 503 504# check for 'asm goto' 505ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y) 506 CC_HAVE_ASM_GOTO := 1 507 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO 508 KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO 509endif 510 511# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 512# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 513# CC_VERSION_TEXT is referenced from Kconfig (so it needs export), 514# and from include/config/auto.conf.cmd to detect the compiler upgrade. 515CC_VERSION_TEXT = $(shell $(CC) --version | head -n 1) 516 517ifeq ($(config-targets),1) 518# =========================================================================== 519# *config targets only - make sure prerequisites are updated, and descend 520# in scripts/kconfig to make the *config target 521 522# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 523# KBUILD_DEFCONFIG may point out an alternative default configuration 524# used for 'make defconfig' 525include arch/$(SRCARCH)/Makefile 526export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT 527 528config: scripts_basic outputmakefile FORCE 529 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 530 531%config: scripts_basic outputmakefile FORCE 532 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 533 534else 535# =========================================================================== 536# Build targets only - this includes vmlinux, arch specific targets, clean 537# targets and others. In general all targets except *config targets. 538 539# If building an external module we do not care about the all: rule 540# but instead _all depend on modules 541PHONY += all 542ifeq ($(KBUILD_EXTMOD),) 543_all: all 544else 545_all: modules 546endif 547 548# Decide whether to build built-in, modular, or both. 549# Normally, just do built-in. 550 551KBUILD_MODULES := 552KBUILD_BUILTIN := 1 553 554# If we have only "make modules", don't compile built-in objects. 555# When we're building modules with modversions, we need to consider 556# the built-in objects during the descend as well, in order to 557# make sure the checksums are up to date before we record them. 558 559ifeq ($(MAKECMDGOALS),modules) 560 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1) 561endif 562 563# If we have "make <whatever> modules", compile modules 564# in addition to whatever we do anyway. 565# Just "make" or "make all" shall build modules as well 566 567ifneq ($(filter all _all modules,$(MAKECMDGOALS)),) 568 KBUILD_MODULES := 1 569endif 570 571ifeq ($(MAKECMDGOALS),) 572 KBUILD_MODULES := 1 573endif 574 575export KBUILD_MODULES KBUILD_BUILTIN 576 577ifeq ($(KBUILD_EXTMOD),) 578# Objects we will link into vmlinux / subdirs we need to visit 579init-y := init/ 580drivers-y := drivers/ sound/ firmware/ 581net-y := net/ 582libs-y := lib/ 583core-y := usr/ 584virt-y := virt/ 585endif # KBUILD_EXTMOD 586 587ifeq ($(dot-config),1) 588-include include/config/auto.conf 589endif 590 591# The all: target is the default when no target is given on the 592# command line. 593# This allow a user to issue only 'make' to build a kernel including modules 594# Defaults to vmlinux, but the arch makefile usually adds further targets 595all: vmlinux 596 597CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \ 598 $(call cc-option,-fno-tree-loop-im) \ 599 $(call cc-disable-warning,maybe-uninitialized,) 600export CFLAGS_GCOV 601 602# The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default 603# values of the respective KBUILD_* variables 604ARCH_CPPFLAGS := 605ARCH_AFLAGS := 606ARCH_CFLAGS := 607include arch/$(SRCARCH)/Makefile 608 609ifeq ($(dot-config),1) 610ifeq ($(KBUILD_EXTMOD),) 611# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 612# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 613# because some architectures define CROSS_COMPILE there. 614-include include/config/auto.conf.cmd 615 616# To avoid any implicit rule to kick in, define an empty command 617$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ; 618 619# The actual configuration files used during the build are stored in 620# include/generated/ and include/config/. Update them if .config is newer than 621# include/config/auto.conf (which mirrors .config). 622include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd 623 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 624else 625# external modules needs include/generated/autoconf.h and include/config/auto.conf 626# but do not care if they are up-to-date. Use auto.conf to trigger the test 627PHONY += include/config/auto.conf 628 629include/config/auto.conf: 630 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 631 echo >&2; \ 632 echo >&2 " ERROR: Kernel configuration is invalid."; \ 633 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 634 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 635 echo >&2 ; \ 636 /bin/false) 637 638endif # KBUILD_EXTMOD 639 640else 641# Dummy target needed, because used as prerequisite 642include/config/auto.conf: ; 643endif # $(dot-config) 644 645KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,) 646KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) 647KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) 648KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) 649KBUILD_CFLAGS += $(call cc-disable-warning, int-in-bool-context) 650 651ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 652KBUILD_CFLAGS += $(call cc-option,-Oz,-Os) 653KBUILD_CFLAGS += $(call cc-disable-warning,maybe-uninitialized,) 654else 655ifdef CONFIG_PROFILE_ALL_BRANCHES 656KBUILD_CFLAGS += -O2 $(call cc-disable-warning,maybe-uninitialized,) 657else 658KBUILD_CFLAGS += -O2 659endif 660endif 661 662KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \ 663 $(call cc-disable-warning,maybe-uninitialized,)) 664 665# Tell gcc to never replace conditional load with a non-conditional one 666KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 667 668include scripts/Makefile.kcov 669include scripts/Makefile.gcc-plugins 670 671ifdef CONFIG_READABLE_ASM 672# Disable optimizations that make assembler listings hard to read. 673# reorder blocks reorders the control in the function 674# ipa clone creates specialized cloned functions 675# partial inlining inlines only parts of functions 676KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \ 677 $(call cc-option,-fno-ipa-cp-clone,) \ 678 $(call cc-option,-fno-partial-inlining) 679endif 680 681ifneq ($(CONFIG_FRAME_WARN),0) 682KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN}) 683endif 684 685stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector 686stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 687stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 688 689KBUILD_CFLAGS += $(stackp-flags-y) 690 691ifeq ($(cc-name),clang) 692KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,) 693KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier) 694KBUILD_CFLAGS += $(call cc-disable-warning, gnu) 695KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) 696# Quiet clang warning: comparison of unsigned expression < 0 is always false 697KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare) 698# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the 699# source of a reference will be _MergedGlobals and not on of the whitelisted names. 700# See modpost pattern 2 701KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,) 702KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior) 703else 704 705# These warnings generated too much noise in a regular build. 706# Use make W=1 to enable them (see scripts/Makefile.extrawarn) 707KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable) 708endif 709 710KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) 711ifdef CONFIG_FRAME_POINTER 712KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 713else 714# Some targets (ARM with Thumb2, for example), can't be built with frame 715# pointers. For those, we don't have FUNCTION_TRACER automatically 716# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 717# incompatible with -fomit-frame-pointer with current GCC, so we don't use 718# -fomit-frame-pointer with FUNCTION_TRACER. 719ifndef CONFIG_FUNCTION_TRACER 720KBUILD_CFLAGS += -fomit-frame-pointer 721endif 722endif 723 724KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments) 725 726ifdef CONFIG_DEBUG_INFO 727ifdef CONFIG_DEBUG_INFO_SPLIT 728KBUILD_CFLAGS += $(call cc-option, -gsplit-dwarf, -g) 729else 730KBUILD_CFLAGS += -g 731endif 732KBUILD_AFLAGS += -Wa,-gdwarf-2 733endif 734ifdef CONFIG_DEBUG_INFO_DWARF4 735KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,) 736endif 737 738ifdef CONFIG_DEBUG_INFO_REDUCED 739KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \ 740 $(call cc-option,-fno-var-tracking) 741endif 742 743ifdef CONFIG_FUNCTION_TRACER 744ifndef CC_FLAGS_FTRACE 745CC_FLAGS_FTRACE := -pg 746endif 747export CC_FLAGS_FTRACE 748ifdef CONFIG_HAVE_FENTRY 749CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY) 750endif 751KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY) 752KBUILD_AFLAGS += $(CC_USING_FENTRY) 753ifdef CONFIG_DYNAMIC_FTRACE 754 ifdef CONFIG_HAVE_C_RECORDMCOUNT 755 BUILD_C_RECORDMCOUNT := y 756 export BUILD_C_RECORDMCOUNT 757 endif 758endif 759endif 760 761# We trigger additional mismatches with less inlining 762ifdef CONFIG_DEBUG_SECTION_MISMATCH 763KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) 764endif 765 766ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 767KBUILD_CFLAGS_KERNEL += $(call cc-option,-ffunction-sections,) 768KBUILD_CFLAGS_KERNEL += $(call cc-option,-fdata-sections,) 769endif 770 771# arch Makefile may override CC so keep this after arch Makefile is included 772NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) 773 774# warn about C99 declaration after statement 775KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,) 776 777# disable pointer signed / unsigned warnings in gcc 4.0 778KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign) 779 780# disable invalid "can't wrap" optimizations for signed / pointers 781KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow) 782 783# clang sets -fmerge-all-constants by default as optimization, but this 784# is non-conforming behavior for C and in fact breaks the kernel, so we 785# need to disable it here generally. 786KBUILD_CFLAGS += $(call cc-option,-fno-merge-all-constants) 787 788# for gcc -fno-merge-all-constants disables everything, but it is fine 789# to have actual conforming behavior enabled. 790KBUILD_CFLAGS += $(call cc-option,-fmerge-constants) 791 792# Make sure -fstack-check isn't enabled (like gentoo apparently did) 793KBUILD_CFLAGS += $(call cc-option,-fno-stack-check,) 794 795# conserve stack if available 796KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) 797 798# disallow errors like 'EXPORT_GPL(foo);' with missing header 799KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int) 800 801# require functions to have arguments in prototypes, not empty 'int foo()' 802KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes) 803 804# Prohibit date/time macros, which would make the build non-deterministic 805KBUILD_CFLAGS += $(call cc-option,-Werror=date-time) 806 807# enforce correct pointer usage 808KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 809 810# Require designated initializers for all marked structures 811KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) 812 813# change __FILE__ to the relative path from the srctree 814KBUILD_CFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 815 816# use the deterministic mode of AR if available 817KBUILD_ARFLAGS := $(call ar-option,D) 818 819include scripts/Makefile.kasan 820include scripts/Makefile.extrawarn 821include scripts/Makefile.ubsan 822 823# Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the 824# last assignments 825KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS) 826KBUILD_AFLAGS += $(ARCH_AFLAGS) $(KAFLAGS) 827KBUILD_CFLAGS += $(ARCH_CFLAGS) $(KCFLAGS) 828 829# Use --build-id when available. 830LDFLAGS_BUILD_ID := $(call ld-option, --build-id) 831KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID) 832LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID) 833 834ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 835LDFLAGS_vmlinux += $(call ld-option, --gc-sections,) 836endif 837 838ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 839LDFLAGS_vmlinux += $(call ld-option, -X,) 840endif 841 842# insure the checker run with the right endianness 843CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 844 845# the checker needs the correct machine size 846CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 847 848# Default kernel image to build when no specific target is given. 849# KBUILD_IMAGE may be overruled on the command line or 850# set in the environment 851# Also any assignments in arch/$(ARCH)/Makefile take precedence over 852# this default value 853export KBUILD_IMAGE ?= vmlinux 854 855# 856# INSTALL_PATH specifies where to place the updated kernel and system map 857# images. Default is /boot, but you can set it to other values 858export INSTALL_PATH ?= /boot 859 860# 861# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 862# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 863# an argument if needed. Otherwise it defaults to the kernel install path 864# 865export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 866 867# 868# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 869# relocations required by build roots. This is not defined in the 870# makefile but the argument can be passed to make if needed. 871# 872 873MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 874export MODLIB 875 876# 877# INSTALL_MOD_STRIP, if defined, will cause modules to be 878# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then 879# the default option --strip-debug will be used. Otherwise, 880# INSTALL_MOD_STRIP value will be used as the options to the strip command. 881 882ifdef INSTALL_MOD_STRIP 883ifeq ($(INSTALL_MOD_STRIP),1) 884mod_strip_cmd = $(STRIP) --strip-debug 885else 886mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP) 887endif # INSTALL_MOD_STRIP=1 888else 889mod_strip_cmd = true 890endif # INSTALL_MOD_STRIP 891export mod_strip_cmd 892 893# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed 894# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP 895# or CONFIG_MODULE_COMPRESS_XZ. 896 897mod_compress_cmd = true 898ifdef CONFIG_MODULE_COMPRESS 899 ifdef CONFIG_MODULE_COMPRESS_GZIP 900 mod_compress_cmd = gzip -n -f 901 endif # CONFIG_MODULE_COMPRESS_GZIP 902 ifdef CONFIG_MODULE_COMPRESS_XZ 903 mod_compress_cmd = xz -f 904 endif # CONFIG_MODULE_COMPRESS_XZ 905endif # CONFIG_MODULE_COMPRESS 906export mod_compress_cmd 907 908# Select initial ramdisk compression format, default is gzip(1). 909# This shall be used by the dracut(8) tool while creating an initramfs image. 910# 911INITRD_COMPRESS-y := gzip 912INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2 913INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma 914INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz 915INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo 916INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4 917# do not export INITRD_COMPRESS, since we didn't actually 918# choose a sane default compression above. 919# export INITRD_COMPRESS := $(INITRD_COMPRESS-y) 920 921ifdef CONFIG_MODULE_SIG_ALL 922$(eval $(call config_filename,MODULE_SIG_KEY)) 923 924mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509 925else 926mod_sign_cmd = true 927endif 928export mod_sign_cmd 929 930ifdef CONFIG_STACK_VALIDATION 931 has_libelf := $(call try-run,\ 932 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0) 933 ifeq ($(has_libelf),1) 934 objtool_target := tools/objtool FORCE 935 else 936 ifdef CONFIG_UNWINDER_ORC 937 $(error "Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel") 938 else 939 $(warning "Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel") 940 endif 941 SKIP_STACK_VALIDATION := 1 942 export SKIP_STACK_VALIDATION 943 endif 944endif 945 946 947ifeq ($(KBUILD_EXTMOD),) 948core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/ 949 950vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \ 951 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 952 $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y))) 953 954vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \ 955 $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-)))) 956 957init-y := $(patsubst %/, %/built-in.a, $(init-y)) 958core-y := $(patsubst %/, %/built-in.a, $(core-y)) 959drivers-y := $(patsubst %/, %/built-in.a, $(drivers-y)) 960net-y := $(patsubst %/, %/built-in.a, $(net-y)) 961libs-y1 := $(patsubst %/, %/lib.a, $(libs-y)) 962libs-y2 := $(patsubst %/, %/built-in.a, $(filter-out %.a, $(libs-y))) 963virt-y := $(patsubst %/, %/built-in.a, $(virt-y)) 964 965# Externally visible symbols (used by link-vmlinux.sh) 966export KBUILD_VMLINUX_INIT := $(head-y) $(init-y) 967export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y2) $(drivers-y) $(net-y) $(virt-y) 968export KBUILD_VMLINUX_LIBS := $(libs-y1) 969export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 970export LDFLAGS_vmlinux 971# used by scripts/package/Makefile 972export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools) 973 974vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) $(KBUILD_VMLINUX_LIBS) 975 976# Recurse until adjust_autoksyms.sh is satisfied 977PHONY += autoksyms_recursive 978autoksyms_recursive: $(vmlinux-deps) 979ifdef CONFIG_TRIM_UNUSED_KSYMS 980 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ 981 "$(MAKE) -f $(srctree)/Makefile vmlinux" 982endif 983 984# For the kernel to actually contain only the needed exported symbols, 985# we have to build modules as well to determine what those symbols are. 986# (this can be evaluated only once include/config/auto.conf has been included) 987ifdef CONFIG_TRIM_UNUSED_KSYMS 988 KBUILD_MODULES := 1 989endif 990 991autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h) 992 993$(autoksyms_h): 994 $(Q)mkdir -p $(dir $@) 995 $(Q)touch $@ 996 997ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink) 998 999# Final link of vmlinux with optional arch pass after final link 1000cmd_link-vmlinux = \ 1001 $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) ; \ 1002 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) 1003 1004vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE 1005ifdef CONFIG_HEADERS_CHECK 1006 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check 1007endif 1008ifdef CONFIG_GDB_SCRIPTS 1009 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1010endif 1011 +$(call if_changed,link-vmlinux) 1012 1013# Build samples along the rest of the kernel. This needs headers_install. 1014ifdef CONFIG_SAMPLES 1015vmlinux-dirs += samples 1016samples: headers_install 1017endif 1018 1019# The actual objects are generated when descending, 1020# make sure no implicit rule kicks in 1021$(sort $(vmlinux-deps)): $(vmlinux-dirs) ; 1022 1023# Handle descending into subdirectories listed in $(vmlinux-dirs) 1024# Preset locale variables to speed up the build process. Limit locale 1025# tweaks to this spot to avoid wrong language settings when running 1026# make menuconfig etc. 1027# Error messages still appears in the original language 1028 1029PHONY += $(vmlinux-dirs) 1030$(vmlinux-dirs): prepare scripts 1031 $(Q)$(MAKE) $(build)=$@ need-builtin=1 1032 1033define filechk_kernel.release 1034 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1035endef 1036 1037# Store (new) KERNELRELEASE string in include/config/kernel.release 1038include/config/kernel.release: include/config/auto.conf FORCE 1039 $(call filechk,kernel.release) 1040 1041# Additional helpers built in scripts/ 1042# Carefully list dependencies so we do not try to build scripts twice 1043# in parallel 1044PHONY += scripts 1045scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \ 1046 asm-generic gcc-plugins $(autoksyms_h) 1047 $(Q)$(MAKE) $(build)=$(@) 1048 1049# Things we need to do before we recursively start building the kernel 1050# or the modules are listed in "prepare". 1051# A multi level approach is used. prepareN is processed before prepareN-1. 1052# archprepare is used in arch Makefiles and when processed asm symlink, 1053# version.h and scripts_basic is processed / created. 1054 1055# Listed in dependency order 1056PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3 1057 1058# prepare3 is used to check if we are building in a separate output directory, 1059# and if so do: 1060# 1) Check that make has not been executed in the kernel src $(srctree) 1061prepare3: include/config/kernel.release 1062ifneq ($(KBUILD_SRC),) 1063 @$(kecho) ' Using $(srctree) as source for kernel' 1064 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \ 1065 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \ 1066 echo >&2 " in the '$(srctree)' directory.";\ 1067 /bin/false; \ 1068 fi; 1069endif 1070 1071# prepare2 creates a makefile if using a separate output directory. 1072# From this point forward, .config has been reprocessed, so any rules 1073# that need to depend on updated CONFIG_* values can be checked here. 1074prepare2: prepare3 outputmakefile asm-generic 1075 1076prepare1: prepare2 $(version_h) $(autoksyms_h) include/generated/utsrelease.h \ 1077 include/config/auto.conf 1078 $(cmd_crmodverdir) 1079 1080archprepare: archheaders archscripts prepare1 scripts_basic 1081 1082prepare0: archprepare gcc-plugins 1083 $(Q)$(MAKE) $(build)=. 1084 1085# All the preparing.. 1086prepare: prepare0 prepare-objtool 1087 1088# Support for using generic headers in asm-generic 1089PHONY += asm-generic uapi-asm-generic 1090asm-generic: uapi-asm-generic 1091 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \ 1092 src=asm obj=arch/$(SRCARCH)/include/generated/asm 1093uapi-asm-generic: 1094 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \ 1095 src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm 1096 1097PHONY += prepare-objtool 1098prepare-objtool: $(objtool_target) 1099 1100# Generate some files 1101# --------------------------------------------------------------------------- 1102 1103# KERNELRELEASE can change from a few different places, meaning version.h 1104# needs to be updated, so this check is forced on all builds 1105 1106uts_len := 64 1107define filechk_utsrelease.h 1108 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1109 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1110 exit 1; \ 1111 fi; \ 1112 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";) 1113endef 1114 1115define filechk_version.h 1116 (echo \#define LINUX_VERSION_CODE $(shell \ 1117 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \ 1118 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';) 1119endef 1120 1121$(version_h): FORCE 1122 $(call filechk,version.h) 1123 $(Q)rm -f $(old_version_h) 1124 1125include/generated/utsrelease.h: include/config/kernel.release FORCE 1126 $(call filechk,utsrelease.h) 1127 1128PHONY += headerdep 1129headerdep: 1130 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1131 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1132 1133# --------------------------------------------------------------------------- 1134# Kernel headers 1135 1136#Default location for installed headers 1137export INSTALL_HDR_PATH = $(objtree)/usr 1138 1139# If we do an all arch process set dst to include/arch-$(SRCARCH) 1140hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(SRCARCH), dst=include) 1141 1142PHONY += archheaders 1143archheaders: 1144 1145PHONY += archscripts 1146archscripts: 1147 1148PHONY += __headers 1149__headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts 1150 $(Q)$(MAKE) $(build)=scripts build_unifdef 1151 1152PHONY += headers_install_all 1153headers_install_all: 1154 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install 1155 1156PHONY += headers_install 1157headers_install: __headers 1158 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \ 1159 $(error Headers not exportable for the $(SRCARCH) architecture)) 1160 $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include 1161 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) 1162 1163PHONY += headers_check_all 1164headers_check_all: headers_install_all 1165 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check 1166 1167PHONY += headers_check 1168headers_check: headers_install 1169 $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1 1170 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) HDRCHECK=1 1171 1172# --------------------------------------------------------------------------- 1173# Kernel selftest 1174 1175PHONY += kselftest 1176kselftest: 1177 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1178 1179PHONY += kselftest-clean 1180kselftest-clean: 1181 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean 1182 1183PHONY += kselftest-merge 1184kselftest-merge: 1185 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1186 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \ 1187 -m $(objtree)/.config \ 1188 $(srctree)/tools/testing/selftests/*/config 1189 +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1190 1191# --------------------------------------------------------------------------- 1192# Modules 1193 1194ifdef CONFIG_MODULES 1195 1196# By default, build modules as well 1197 1198all: modules 1199 1200# Build modules 1201# 1202# A module can be listed more than once in obj-m resulting in 1203# duplicate lines in modules.order files. Those are removed 1204# using awk while concatenating to the final file. 1205 1206PHONY += modules 1207modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin 1208 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order 1209 @$(kecho) ' Building modules, stage 2.'; 1210 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1211 1212modules.builtin: $(vmlinux-dirs:%=%/modules.builtin) 1213 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin 1214 1215%/modules.builtin: include/config/auto.conf 1216 $(Q)$(MAKE) $(modbuiltin)=$* 1217 1218 1219# Target to prepare building external modules 1220PHONY += modules_prepare 1221modules_prepare: prepare scripts 1222 1223# Target to install modules 1224PHONY += modules_install 1225modules_install: _modinst_ _modinst_post 1226 1227PHONY += _modinst_ 1228_modinst_: 1229 @rm -rf $(MODLIB)/kernel 1230 @rm -f $(MODLIB)/source 1231 @mkdir -p $(MODLIB)/kernel 1232 @ln -s $(abspath $(srctree)) $(MODLIB)/source 1233 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1234 rm -f $(MODLIB)/build ; \ 1235 ln -s $(CURDIR) $(MODLIB)/build ; \ 1236 fi 1237 @cp -f $(objtree)/modules.order $(MODLIB)/ 1238 @cp -f $(objtree)/modules.builtin $(MODLIB)/ 1239 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1240 1241# This depmod is only for convenience to give the initial 1242# boot a modules.dep even before / is mounted read-write. However the 1243# boot script depmod is the master version. 1244PHONY += _modinst_post 1245_modinst_post: _modinst_ 1246 $(call cmd,depmod) 1247 1248ifeq ($(CONFIG_MODULE_SIG), y) 1249PHONY += modules_sign 1250modules_sign: 1251 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign 1252endif 1253 1254else # CONFIG_MODULES 1255 1256# Modules not configured 1257# --------------------------------------------------------------------------- 1258 1259PHONY += modules modules_install 1260modules modules_install: 1261 @echo >&2 1262 @echo >&2 "The present kernel configuration has modules disabled." 1263 @echo >&2 "Type 'make config' and enable loadable module support." 1264 @echo >&2 "Then build a kernel with module support enabled." 1265 @echo >&2 1266 @exit 1 1267 1268endif # CONFIG_MODULES 1269 1270### 1271# Cleaning is done on three levels. 1272# make clean Delete most generated files 1273# Leave enough to build external modules 1274# make mrproper Delete the current configuration, and all generated files 1275# make distclean Remove editor backup files, patch leftover files and the like 1276 1277# Directories & files removed with 'make clean' 1278CLEAN_DIRS += $(MODVERDIR) include/ksym 1279 1280# Directories & files removed with 'make mrproper' 1281MRPROPER_DIRS += include/config usr/include include/generated \ 1282 arch/*/include/generated .tmp_objdiff 1283MRPROPER_FILES += .config .config.old .version \ 1284 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \ 1285 signing_key.pem signing_key.priv signing_key.x509 \ 1286 x509.genkey extra_certificates signing_key.x509.keyid \ 1287 signing_key.x509.signer vmlinux-gdb.py 1288 1289# clean - Delete most, but leave enough to build external modules 1290# 1291clean: rm-dirs := $(CLEAN_DIRS) 1292clean: rm-files := $(CLEAN_FILES) 1293clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples) 1294 1295PHONY += $(clean-dirs) clean archclean vmlinuxclean 1296$(clean-dirs): 1297 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1298 1299vmlinuxclean: 1300 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1301 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1302 1303clean: archclean vmlinuxclean 1304 1305# mrproper - Delete all generated files, including .config 1306# 1307mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS)) 1308mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1309mrproper-dirs := $(addprefix _mrproper_,scripts) 1310 1311PHONY += $(mrproper-dirs) mrproper archmrproper 1312$(mrproper-dirs): 1313 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1314 1315mrproper: clean archmrproper $(mrproper-dirs) 1316 $(call cmd,rmdirs) 1317 $(call cmd,rmfiles) 1318 1319# distclean 1320# 1321PHONY += distclean 1322 1323distclean: mrproper 1324 @find $(srctree) $(RCS_FIND_IGNORE) \ 1325 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1326 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1327 -o -name 'core' \) \ 1328 -type f -print | xargs rm -f 1329 1330 1331# Packaging of the kernel to various formats 1332# --------------------------------------------------------------------------- 1333# rpm target kept for backward compatibility 1334package-dir := scripts/package 1335 1336%src-pkg: FORCE 1337 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1338%pkg: include/config/kernel.release FORCE 1339 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1340rpm: rpm-pkg 1341 @echo " WARNING: \"rpm\" target will be removed after Linux 4.18" 1342 @echo " Please use \"rpm-pkg\" instead." 1343 1344 1345# Brief documentation of the typical targets used 1346# --------------------------------------------------------------------------- 1347 1348boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1349boards := $(sort $(notdir $(boards))) 1350board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1351board-dirs := $(sort $(notdir $(board-dirs:/=))) 1352 1353PHONY += help 1354help: 1355 @echo 'Cleaning targets:' 1356 @echo ' clean - Remove most generated files but keep the config and' 1357 @echo ' enough build support to build external modules' 1358 @echo ' mrproper - Remove all generated files + config + various backup files' 1359 @echo ' distclean - mrproper + remove editor backup and patch files' 1360 @echo '' 1361 @echo 'Configuration targets:' 1362 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1363 @echo '' 1364 @echo 'Other generic targets:' 1365 @echo ' all - Build all targets marked with [*]' 1366 @echo '* vmlinux - Build the bare kernel' 1367 @echo '* modules - Build all modules' 1368 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1369 @echo ' dir/ - Build all files in dir and below' 1370 @echo ' dir/file.[ois] - Build specified target only' 1371 @echo ' dir/file.ll - Build the LLVM assembly file' 1372 @echo ' (requires compiler support for LLVM assembly generation)' 1373 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1374 @echo ' (requires a recent binutils and recent build (System.map))' 1375 @echo ' dir/file.ko - Build module including final link' 1376 @echo ' modules_prepare - Set up for building external modules' 1377 @echo ' tags/TAGS - Generate tags file for editors' 1378 @echo ' cscope - Generate cscope index' 1379 @echo ' gtags - Generate GNU GLOBAL index' 1380 @echo ' kernelrelease - Output the release version string (use with make -s)' 1381 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1382 @echo ' image_name - Output the image name (use with make -s)' 1383 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1384 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1385 echo '' 1386 @echo 'Static analysers:' 1387 @echo ' checkstack - Generate a list of stack hogs' 1388 @echo ' namespacecheck - Name space analysis on compiled kernel' 1389 @echo ' versioncheck - Sanity check on version.h usage' 1390 @echo ' includecheck - Check for duplicate included header files' 1391 @echo ' export_report - List the usages of all exported symbols' 1392 @echo ' headers_check - Sanity check on exported headers' 1393 @echo ' headerdep - Detect inclusion cycles in headers' 1394 @echo ' coccicheck - Check with Coccinelle' 1395 @echo '' 1396 @echo 'Kernel selftest:' 1397 @echo ' kselftest - Build and run kernel selftest (run as root)' 1398 @echo ' Build, install, and boot kernel before' 1399 @echo ' running kselftest on it' 1400 @echo ' kselftest-clean - Remove all generated kselftest files' 1401 @echo ' kselftest-merge - Merge all the config dependencies of kselftest to existing' 1402 @echo ' .config.' 1403 @echo '' 1404 @echo 'Userspace tools targets:' 1405 @echo ' use "make tools/help"' 1406 @echo ' or "cd tools; make help"' 1407 @echo '' 1408 @echo 'Kernel packaging:' 1409 @$(MAKE) $(build)=$(package-dir) help 1410 @echo '' 1411 @echo 'Documentation targets:' 1412 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1413 @echo '' 1414 @echo 'Architecture specific targets ($(SRCARCH)):' 1415 @$(if $(archhelp),$(archhelp),\ 1416 echo ' No architecture specific help defined for $(SRCARCH)') 1417 @echo '' 1418 @$(if $(boards), \ 1419 $(foreach b, $(boards), \ 1420 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1421 echo '') 1422 @$(if $(board-dirs), \ 1423 $(foreach b, $(board-dirs), \ 1424 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1425 printf " %-16s - Show all of the above\\n" help-boards; \ 1426 echo '') 1427 1428 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1429 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1430 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1431 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK (sparse by default)' 1432 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1433 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1434 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where' 1435 @echo ' 1: warnings which may be relevant and do not occur too often' 1436 @echo ' 2: warnings which occur quite often but may still be relevant' 1437 @echo ' 3: more obscure warnings, can most likely be ignored' 1438 @echo ' Multiple levels can be combined with W=12 or W=123' 1439 @echo '' 1440 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1441 @echo 'For further info see the ./README file' 1442 1443 1444help-board-dirs := $(addprefix help-,$(board-dirs)) 1445 1446help-boards: $(help-board-dirs) 1447 1448boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1449 1450$(help-board-dirs): help-%: 1451 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1452 @$(if $(boards-per-dir), \ 1453 $(foreach b, $(boards-per-dir), \ 1454 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1455 echo '') 1456 1457 1458# Documentation targets 1459# --------------------------------------------------------------------------- 1460DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1461 linkcheckdocs dochelp refcheckdocs 1462PHONY += $(DOC_TARGETS) 1463$(DOC_TARGETS): scripts_basic FORCE 1464 $(Q)$(MAKE) $(build)=Documentation $@ 1465 1466else # KBUILD_EXTMOD 1467 1468### 1469# External module support. 1470# When building external modules the kernel used as basis is considered 1471# read-only, and no consistency checks are made and the make 1472# system is not used on the basis kernel. If updates are required 1473# in the basis kernel ordinary make commands (without M=...) must 1474# be used. 1475# 1476# The following are the only valid targets when building external 1477# modules. 1478# make M=dir clean Delete all automatically generated files 1479# make M=dir modules Make all modules in specified dir 1480# make M=dir Same as 'make M=dir modules' 1481# make M=dir modules_install 1482# Install the modules built in the module directory 1483# Assumes install directory is already created 1484 1485# We are always building modules 1486KBUILD_MODULES := 1 1487PHONY += crmodverdir 1488crmodverdir: 1489 $(cmd_crmodverdir) 1490 1491PHONY += $(objtree)/Module.symvers 1492$(objtree)/Module.symvers: 1493 @test -e $(objtree)/Module.symvers || ( \ 1494 echo; \ 1495 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \ 1496 echo " is missing; modules will have no dependencies and modversions."; \ 1497 echo ) 1498 1499module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD)) 1500PHONY += $(module-dirs) modules 1501$(module-dirs): crmodverdir $(objtree)/Module.symvers 1502 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@) 1503 1504modules: $(module-dirs) 1505 @$(kecho) ' Building modules, stage 2.'; 1506 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1507 1508PHONY += modules_install 1509modules_install: _emodinst_ _emodinst_post 1510 1511install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra) 1512PHONY += _emodinst_ 1513_emodinst_: 1514 $(Q)mkdir -p $(MODLIB)/$(install-dir) 1515 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1516 1517PHONY += _emodinst_post 1518_emodinst_post: _emodinst_ 1519 $(call cmd,depmod) 1520 1521clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD)) 1522 1523PHONY += $(clean-dirs) clean 1524$(clean-dirs): 1525 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1526 1527clean: rm-dirs := $(MODVERDIR) 1528clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers 1529 1530PHONY += help 1531help: 1532 @echo ' Building external modules.' 1533 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1534 @echo '' 1535 @echo ' modules - default target, build the module(s)' 1536 @echo ' modules_install - install the module' 1537 @echo ' clean - remove generated files in module directory only' 1538 @echo '' 1539 1540# Dummies... 1541PHONY += prepare scripts 1542prepare: ; 1543scripts: ; 1544endif # KBUILD_EXTMOD 1545 1546clean: $(clean-dirs) 1547 $(call cmd,rmdirs) 1548 $(call cmd,rmfiles) 1549 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1550 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \ 1551 -o -name '*.ko.*' -o -name '*.dtb' -o -name '*.dtb.S' \ 1552 -o -name '*.dwo' -o -name '*.lst' \ 1553 -o -name '*.su' \ 1554 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1555 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 1556 -o -name '*.asn1.[ch]' \ 1557 -o -name '*.symtypes' -o -name 'modules.order' \ 1558 -o -name modules.builtin -o -name '.tmp_*.o.*' \ 1559 -o -name '*.c.[012]*.*' \ 1560 -o -name '*.ll' \ 1561 -o -name '*.gcno' \) -type f -print | xargs rm -f 1562 1563# Generate tags for editors 1564# --------------------------------------------------------------------------- 1565quiet_cmd_tags = GEN $@ 1566 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@ 1567 1568tags TAGS cscope gtags: FORCE 1569 $(call cmd,tags) 1570 1571# Scripts to check various things for consistency 1572# --------------------------------------------------------------------------- 1573 1574PHONY += includecheck versioncheck coccicheck namespacecheck export_report 1575 1576includecheck: 1577 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1578 -name '*.[hcS]' -type f -print | sort \ 1579 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1580 1581versioncheck: 1582 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1583 -name '*.[hcS]' -type f -print | sort \ 1584 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1585 1586coccicheck: 1587 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@ 1588 1589namespacecheck: 1590 $(PERL) $(srctree)/scripts/namespace.pl 1591 1592export_report: 1593 $(PERL) $(srctree)/scripts/export_report.pl 1594 1595endif #ifeq ($(config-targets),1) 1596endif #ifeq ($(mixed-targets),1) 1597 1598PHONY += checkstack kernelrelease kernelversion image_name 1599 1600# UML needs a little special treatment here. It wants to use the host 1601# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1602# else wants $(ARCH), including people doing cross-builds, which means 1603# that $(SUBARCH) doesn't work here. 1604ifeq ($(ARCH), um) 1605CHECKSTACK_ARCH := $(SUBARCH) 1606else 1607CHECKSTACK_ARCH := $(ARCH) 1608endif 1609checkstack: 1610 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1611 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1612 1613kernelrelease: 1614 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1615 1616kernelversion: 1617 @echo $(KERNELVERSION) 1618 1619image_name: 1620 @echo $(KBUILD_IMAGE) 1621 1622# Clear a bunch of variables before executing the submake 1623tools/: FORCE 1624 $(Q)mkdir -p $(objtree)/tools 1625 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ 1626 1627tools/%: FORCE 1628 $(Q)mkdir -p $(objtree)/tools 1629 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $* 1630 1631# Single targets 1632# --------------------------------------------------------------------------- 1633# Single targets are compatible with: 1634# - build with mixed source and output 1635# - build with separate output dir 'make O=...' 1636# - external modules 1637# 1638# target-dir => where to store outputfile 1639# build-dir => directory in kernel source tree to use 1640 1641ifeq ($(KBUILD_EXTMOD),) 1642 build-dir = $(patsubst %/,%,$(dir $@)) 1643 target-dir = $(dir $@) 1644else 1645 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@))) 1646 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash)) 1647 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@)) 1648endif 1649 1650%.s: %.c prepare scripts FORCE 1651 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1652%.i: %.c prepare scripts FORCE 1653 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1654%.o: %.c prepare scripts FORCE 1655 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1656%.lst: %.c prepare scripts FORCE 1657 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1658%.s: %.S prepare scripts FORCE 1659 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1660%.o: %.S prepare scripts FORCE 1661 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1662%.symtypes: %.c prepare scripts FORCE 1663 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1664%.ll: %.c prepare scripts FORCE 1665 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1666 1667# Modules 1668/: prepare scripts FORCE 1669 $(cmd_crmodverdir) 1670 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1671 $(build)=$(build-dir) 1672# Make sure the latest headers are built for Documentation 1673Documentation/ samples/: headers_install 1674%/: prepare scripts FORCE 1675 $(cmd_crmodverdir) 1676 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1677 $(build)=$(build-dir) 1678%.ko: prepare scripts FORCE 1679 $(cmd_crmodverdir) 1680 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1681 $(build)=$(build-dir) $(@:.ko=.o) 1682 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1683 1684# FIXME Should go into a make.lib or something 1685# =========================================================================== 1686 1687quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs))) 1688 cmd_rmdirs = rm -rf $(rm-dirs) 1689 1690quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1691 cmd_rmfiles = rm -f $(rm-files) 1692 1693# Run depmod only if we have System.map and depmod is executable 1694quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) 1695 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1696 $(KERNELRELEASE) 1697 1698# Create temporary dir for module support files 1699# clean it up only when building all modules 1700cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \ 1701 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*) 1702 1703# read all saved command lines 1704 1705cmd_files := $(wildcard .*.cmd $(foreach f,$(sort $(targets)),$(dir $(f)).$(notdir $(f)).cmd)) 1706 1707ifneq ($(cmd_files),) 1708 $(cmd_files): ; # Do not try to update included dependency files 1709 include $(cmd_files) 1710endif 1711 1712endif # skip-makefile 1713 1714PHONY += FORCE 1715FORCE: 1716 1717# Declare the contents of the PHONY variable as phony. We keep that 1718# information in a variable so we can use it in if_changed and friends. 1719.PHONY: $(PHONY) 1720