1# SPDX-License-Identifier: GPL-2.0 2VERSION = 4 3PATCHLEVEL = 18 4SUBLEVEL = 0 5EXTRAVERSION = -rc1 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 $(version_h) headers_% archheaders archscripts \ 227 kernelversion %src-pkg 228 229config-targets := 0 230mixed-targets := 0 231dot-config := 1 232 233ifneq ($(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) 357HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS) 358HOST_LFS_LIBS := $(shell getconf LFS_LIBS) 359 360HOSTCC = gcc 361HOSTCXX = g++ 362HOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \ 363 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) 364HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS) 365HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) 366HOST_LOADLIBES := $(HOST_LFS_LIBS) 367 368# Make variables (CC, etc...) 369AS = $(CROSS_COMPILE)as 370LD = $(CROSS_COMPILE)ld 371CC = $(CROSS_COMPILE)gcc 372CPP = $(CC) -E 373AR = $(CROSS_COMPILE)ar 374NM = $(CROSS_COMPILE)nm 375STRIP = $(CROSS_COMPILE)strip 376OBJCOPY = $(CROSS_COMPILE)objcopy 377OBJDUMP = $(CROSS_COMPILE)objdump 378LEX = flex 379YACC = bison 380AWK = awk 381GENKSYMS = scripts/genksyms/genksyms 382INSTALLKERNEL := installkernel 383DEPMOD = /sbin/depmod 384PERL = perl 385PYTHON = python 386PYTHON2 = python2 387PYTHON3 = python3 388CHECK = sparse 389 390CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 391 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 392NOSTDINC_FLAGS = 393CFLAGS_MODULE = 394AFLAGS_MODULE = 395LDFLAGS_MODULE = 396CFLAGS_KERNEL = 397AFLAGS_KERNEL = 398LDFLAGS_vmlinux = 399 400# Use USERINCLUDE when you must reference the UAPI directories only. 401USERINCLUDE := \ 402 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 403 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 404 -I$(srctree)/include/uapi \ 405 -I$(objtree)/include/generated/uapi \ 406 -include $(srctree)/include/linux/kconfig.h 407 408# Use LINUXINCLUDE when you must reference the include/ directory. 409# Needed to be compatible with the O= option 410LINUXINCLUDE := \ 411 -I$(srctree)/arch/$(SRCARCH)/include \ 412 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 413 $(if $(KBUILD_SRC), -I$(srctree)/include) \ 414 -I$(objtree)/include \ 415 $(USERINCLUDE) 416 417KBUILD_AFLAGS := -D__ASSEMBLY__ 418KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \ 419 -fno-strict-aliasing -fno-common -fshort-wchar \ 420 -Werror-implicit-function-declaration \ 421 -Wno-format-security \ 422 -std=gnu89 423KBUILD_CPPFLAGS := -D__KERNEL__ 424KBUILD_AFLAGS_KERNEL := 425KBUILD_CFLAGS_KERNEL := 426KBUILD_AFLAGS_MODULE := -DMODULE 427KBUILD_CFLAGS_MODULE := -DMODULE 428KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds 429LDFLAGS := 430GCC_PLUGINS_CFLAGS := 431 432export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC 433export CPP AR NM STRIP OBJCOPY OBJDUMP HOSTLDFLAGS HOST_LOADLIBES 434export MAKE LEX YACC AWK GENKSYMS INSTALLKERNEL PERL PYTHON PYTHON2 PYTHON3 UTS_MACHINE 435export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS 436 437export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS 438export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 439export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN 440export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 441export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 442export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 443export KBUILD_ARFLAGS 444 445# When compiling out-of-tree modules, put MODVERDIR in the module 446# tree rather than in the kernel tree. The kernel tree might 447# even be read-only. 448export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions 449 450# Files to ignore in find ... statements 451 452export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 453 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 454 -prune -o 455export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 456 --exclude CVS --exclude .pc --exclude .hg --exclude .git 457 458# =========================================================================== 459# Rules shared between *config targets and build targets 460 461# Basic helpers built in scripts/basic/ 462PHONY += scripts_basic 463scripts_basic: 464 $(Q)$(MAKE) $(build)=scripts/basic 465 $(Q)rm -f .tmp_quiet_recordmcount 466 467# To avoid any implicit rule to kick in, define an empty command. 468scripts/basic/%: scripts_basic ; 469 470PHONY += outputmakefile 471# outputmakefile generates a Makefile in the output directory, if using a 472# separate output directory. This allows convenient use of make in the 473# output directory. 474outputmakefile: 475ifneq ($(KBUILD_SRC),) 476 $(Q)ln -fsn $(srctree) source 477 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \ 478 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL) 479endif 480 481ifeq ($(cc-name),clang) 482ifneq ($(CROSS_COMPILE),) 483CLANG_TARGET := --target=$(notdir $(CROSS_COMPILE:%-=%)) 484GCC_TOOLCHAIN := $(realpath $(dir $(shell which $(LD)))/..) 485endif 486ifneq ($(GCC_TOOLCHAIN),) 487CLANG_GCC_TC := --gcc-toolchain=$(GCC_TOOLCHAIN) 488endif 489KBUILD_CFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC) 490KBUILD_AFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC) 491KBUILD_CFLAGS += $(call cc-option, -no-integrated-as) 492KBUILD_AFLAGS += $(call cc-option, -no-integrated-as) 493endif 494 495RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register 496RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk 497RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG))) 498export RETPOLINE_CFLAGS 499 500KBUILD_CFLAGS += $(call cc-option,-fno-PIE) 501KBUILD_AFLAGS += $(call cc-option,-fno-PIE) 502 503# check for 'asm goto' 504ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y) 505 CC_HAVE_ASM_GOTO := 1 506 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO 507 KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO 508endif 509 510ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/cc-can-link.sh $(CC)), y) 511 CC_CAN_LINK := y 512 export CC_CAN_LINK 513endif 514 515# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 516# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 517# CC_VERSION_TEXT is referenced from Kconfig (so it needs export), 518# and from include/config/auto.conf.cmd to detect the compiler upgrade. 519CC_VERSION_TEXT = $(shell $(CC) --version | head -n 1) 520 521ifeq ($(config-targets),1) 522# =========================================================================== 523# *config targets only - make sure prerequisites are updated, and descend 524# in scripts/kconfig to make the *config target 525 526# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 527# KBUILD_DEFCONFIG may point out an alternative default configuration 528# used for 'make defconfig' 529include arch/$(SRCARCH)/Makefile 530export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT 531 532config: scripts_basic outputmakefile FORCE 533 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 534 535%config: scripts_basic outputmakefile FORCE 536 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 537 538else 539# =========================================================================== 540# Build targets only - this includes vmlinux, arch specific targets, clean 541# targets and others. In general all targets except *config targets. 542 543# If building an external module we do not care about the all: rule 544# but instead _all depend on modules 545PHONY += all 546ifeq ($(KBUILD_EXTMOD),) 547_all: all 548else 549_all: modules 550endif 551 552# Decide whether to build built-in, modular, or both. 553# Normally, just do built-in. 554 555KBUILD_MODULES := 556KBUILD_BUILTIN := 1 557 558# If we have only "make modules", don't compile built-in objects. 559# When we're building modules with modversions, we need to consider 560# the built-in objects during the descend as well, in order to 561# make sure the checksums are up to date before we record them. 562 563ifeq ($(MAKECMDGOALS),modules) 564 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1) 565endif 566 567# If we have "make <whatever> modules", compile modules 568# in addition to whatever we do anyway. 569# Just "make" or "make all" shall build modules as well 570 571ifneq ($(filter all _all modules,$(MAKECMDGOALS)),) 572 KBUILD_MODULES := 1 573endif 574 575ifeq ($(MAKECMDGOALS),) 576 KBUILD_MODULES := 1 577endif 578 579export KBUILD_MODULES KBUILD_BUILTIN 580 581ifeq ($(KBUILD_EXTMOD),) 582# Objects we will link into vmlinux / subdirs we need to visit 583init-y := init/ 584drivers-y := drivers/ sound/ firmware/ 585net-y := net/ 586libs-y := lib/ 587core-y := usr/ 588virt-y := virt/ 589endif # KBUILD_EXTMOD 590 591ifeq ($(dot-config),1) 592-include include/config/auto.conf 593endif 594 595# The all: target is the default when no target is given on the 596# command line. 597# This allow a user to issue only 'make' to build a kernel including modules 598# Defaults to vmlinux, but the arch makefile usually adds further targets 599all: vmlinux 600 601CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \ 602 $(call cc-option,-fno-tree-loop-im) \ 603 $(call cc-disable-warning,maybe-uninitialized,) 604export CFLAGS_GCOV 605 606# The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default 607# values of the respective KBUILD_* variables 608ARCH_CPPFLAGS := 609ARCH_AFLAGS := 610ARCH_CFLAGS := 611include arch/$(SRCARCH)/Makefile 612 613ifeq ($(dot-config),1) 614ifeq ($(KBUILD_EXTMOD),) 615# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 616# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 617# because some architectures define CROSS_COMPILE there. 618-include include/config/auto.conf.cmd 619 620# To avoid any implicit rule to kick in, define an empty command 621$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ; 622 623# The actual configuration files used during the build are stored in 624# include/generated/ and include/config/. Update them if .config is newer than 625# include/config/auto.conf (which mirrors .config). 626include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd 627 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 628else 629# external modules needs include/generated/autoconf.h and include/config/auto.conf 630# but do not care if they are up-to-date. Use auto.conf to trigger the test 631PHONY += include/config/auto.conf 632 633include/config/auto.conf: 634 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 635 echo >&2; \ 636 echo >&2 " ERROR: Kernel configuration is invalid."; \ 637 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 638 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 639 echo >&2 ; \ 640 /bin/false) 641 642endif # KBUILD_EXTMOD 643 644else 645# Dummy target needed, because used as prerequisite 646include/config/auto.conf: ; 647endif # $(dot-config) 648 649KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,) 650KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) 651KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) 652KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) 653KBUILD_CFLAGS += $(call cc-disable-warning, int-in-bool-context) 654 655ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 656KBUILD_CFLAGS += $(call cc-option,-Oz,-Os) 657KBUILD_CFLAGS += $(call cc-disable-warning,maybe-uninitialized,) 658else 659ifdef CONFIG_PROFILE_ALL_BRANCHES 660KBUILD_CFLAGS += -O2 $(call cc-disable-warning,maybe-uninitialized,) 661else 662KBUILD_CFLAGS += -O2 663endif 664endif 665 666KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \ 667 $(call cc-disable-warning,maybe-uninitialized,)) 668 669# Tell gcc to never replace conditional load with a non-conditional one 670KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 671 672include scripts/Makefile.kcov 673include scripts/Makefile.gcc-plugins 674 675ifdef CONFIG_READABLE_ASM 676# Disable optimizations that make assembler listings hard to read. 677# reorder blocks reorders the control in the function 678# ipa clone creates specialized cloned functions 679# partial inlining inlines only parts of functions 680KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \ 681 $(call cc-option,-fno-ipa-cp-clone,) \ 682 $(call cc-option,-fno-partial-inlining) 683endif 684 685ifneq ($(CONFIG_FRAME_WARN),0) 686KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN}) 687endif 688 689stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector 690stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 691stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 692 693KBUILD_CFLAGS += $(stackp-flags-y) 694 695ifeq ($(cc-name),clang) 696KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,) 697KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier) 698KBUILD_CFLAGS += $(call cc-disable-warning, gnu) 699KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) 700# Quiet clang warning: comparison of unsigned expression < 0 is always false 701KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare) 702# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the 703# source of a reference will be _MergedGlobals and not on of the whitelisted names. 704# See modpost pattern 2 705KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,) 706KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior) 707else 708 709# These warnings generated too much noise in a regular build. 710# Use make W=1 to enable them (see scripts/Makefile.extrawarn) 711KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable) 712endif 713 714KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) 715ifdef CONFIG_FRAME_POINTER 716KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 717else 718# Some targets (ARM with Thumb2, for example), can't be built with frame 719# pointers. For those, we don't have FUNCTION_TRACER automatically 720# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 721# incompatible with -fomit-frame-pointer with current GCC, so we don't use 722# -fomit-frame-pointer with FUNCTION_TRACER. 723ifndef CONFIG_FUNCTION_TRACER 724KBUILD_CFLAGS += -fomit-frame-pointer 725endif 726endif 727 728KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments) 729 730ifdef CONFIG_DEBUG_INFO 731ifdef CONFIG_DEBUG_INFO_SPLIT 732KBUILD_CFLAGS += $(call cc-option, -gsplit-dwarf, -g) 733else 734KBUILD_CFLAGS += -g 735endif 736KBUILD_AFLAGS += -Wa,-gdwarf-2 737endif 738ifdef CONFIG_DEBUG_INFO_DWARF4 739KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,) 740endif 741 742ifdef CONFIG_DEBUG_INFO_REDUCED 743KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \ 744 $(call cc-option,-fno-var-tracking) 745endif 746 747ifdef CONFIG_FUNCTION_TRACER 748ifndef CC_FLAGS_FTRACE 749CC_FLAGS_FTRACE := -pg 750endif 751export CC_FLAGS_FTRACE 752ifdef CONFIG_HAVE_FENTRY 753CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY) 754endif 755KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY) 756KBUILD_AFLAGS += $(CC_USING_FENTRY) 757ifdef CONFIG_DYNAMIC_FTRACE 758 ifdef CONFIG_HAVE_C_RECORDMCOUNT 759 BUILD_C_RECORDMCOUNT := y 760 export BUILD_C_RECORDMCOUNT 761 endif 762endif 763endif 764 765# We trigger additional mismatches with less inlining 766ifdef CONFIG_DEBUG_SECTION_MISMATCH 767KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) 768endif 769 770ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 771KBUILD_CFLAGS_KERNEL += $(call cc-option,-ffunction-sections,) 772KBUILD_CFLAGS_KERNEL += $(call cc-option,-fdata-sections,) 773endif 774 775# arch Makefile may override CC so keep this after arch Makefile is included 776NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) 777 778# warn about C99 declaration after statement 779KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,) 780 781# disable pointer signed / unsigned warnings in gcc 4.0 782KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign) 783 784# disable invalid "can't wrap" optimizations for signed / pointers 785KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow) 786 787# clang sets -fmerge-all-constants by default as optimization, but this 788# is non-conforming behavior for C and in fact breaks the kernel, so we 789# need to disable it here generally. 790KBUILD_CFLAGS += $(call cc-option,-fno-merge-all-constants) 791 792# for gcc -fno-merge-all-constants disables everything, but it is fine 793# to have actual conforming behavior enabled. 794KBUILD_CFLAGS += $(call cc-option,-fmerge-constants) 795 796# Make sure -fstack-check isn't enabled (like gentoo apparently did) 797KBUILD_CFLAGS += $(call cc-option,-fno-stack-check,) 798 799# conserve stack if available 800KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) 801 802# disallow errors like 'EXPORT_GPL(foo);' with missing header 803KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int) 804 805# require functions to have arguments in prototypes, not empty 'int foo()' 806KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes) 807 808# Prohibit date/time macros, which would make the build non-deterministic 809KBUILD_CFLAGS += $(call cc-option,-Werror=date-time) 810 811# enforce correct pointer usage 812KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 813 814# Require designated initializers for all marked structures 815KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) 816 817# change __FILE__ to the relative path from the srctree 818KBUILD_CFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 819 820# use the deterministic mode of AR if available 821KBUILD_ARFLAGS := $(call ar-option,D) 822 823include scripts/Makefile.kasan 824include scripts/Makefile.extrawarn 825include scripts/Makefile.ubsan 826 827# Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the 828# last assignments 829KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS) 830KBUILD_AFLAGS += $(ARCH_AFLAGS) $(KAFLAGS) 831KBUILD_CFLAGS += $(ARCH_CFLAGS) $(KCFLAGS) 832 833# Use --build-id when available. 834LDFLAGS_BUILD_ID := $(call ld-option, --build-id) 835KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID) 836LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID) 837 838ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 839LDFLAGS_vmlinux += $(call ld-option, --gc-sections,) 840endif 841 842ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 843LDFLAGS_vmlinux += $(call ld-option, -X,) 844endif 845 846# insure the checker run with the right endianness 847CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 848 849# the checker needs the correct machine size 850CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 851 852# Default kernel image to build when no specific target is given. 853# KBUILD_IMAGE may be overruled on the command line or 854# set in the environment 855# Also any assignments in arch/$(ARCH)/Makefile take precedence over 856# this default value 857export KBUILD_IMAGE ?= vmlinux 858 859# 860# INSTALL_PATH specifies where to place the updated kernel and system map 861# images. Default is /boot, but you can set it to other values 862export INSTALL_PATH ?= /boot 863 864# 865# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 866# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 867# an argument if needed. Otherwise it defaults to the kernel install path 868# 869export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 870 871# 872# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 873# relocations required by build roots. This is not defined in the 874# makefile but the argument can be passed to make if needed. 875# 876 877MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 878export MODLIB 879 880# 881# INSTALL_MOD_STRIP, if defined, will cause modules to be 882# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then 883# the default option --strip-debug will be used. Otherwise, 884# INSTALL_MOD_STRIP value will be used as the options to the strip command. 885 886ifdef INSTALL_MOD_STRIP 887ifeq ($(INSTALL_MOD_STRIP),1) 888mod_strip_cmd = $(STRIP) --strip-debug 889else 890mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP) 891endif # INSTALL_MOD_STRIP=1 892else 893mod_strip_cmd = true 894endif # INSTALL_MOD_STRIP 895export mod_strip_cmd 896 897# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed 898# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP 899# or CONFIG_MODULE_COMPRESS_XZ. 900 901mod_compress_cmd = true 902ifdef CONFIG_MODULE_COMPRESS 903 ifdef CONFIG_MODULE_COMPRESS_GZIP 904 mod_compress_cmd = gzip -n -f 905 endif # CONFIG_MODULE_COMPRESS_GZIP 906 ifdef CONFIG_MODULE_COMPRESS_XZ 907 mod_compress_cmd = xz -f 908 endif # CONFIG_MODULE_COMPRESS_XZ 909endif # CONFIG_MODULE_COMPRESS 910export mod_compress_cmd 911 912# Select initial ramdisk compression format, default is gzip(1). 913# This shall be used by the dracut(8) tool while creating an initramfs image. 914# 915INITRD_COMPRESS-y := gzip 916INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2 917INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma 918INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz 919INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo 920INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4 921# do not export INITRD_COMPRESS, since we didn't actually 922# choose a sane default compression above. 923# export INITRD_COMPRESS := $(INITRD_COMPRESS-y) 924 925ifdef CONFIG_MODULE_SIG_ALL 926$(eval $(call config_filename,MODULE_SIG_KEY)) 927 928mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509 929else 930mod_sign_cmd = true 931endif 932export mod_sign_cmd 933 934ifdef CONFIG_STACK_VALIDATION 935 has_libelf := $(call try-run,\ 936 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0) 937 ifeq ($(has_libelf),1) 938 objtool_target := tools/objtool FORCE 939 else 940 ifdef CONFIG_UNWINDER_ORC 941 $(error "Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel") 942 else 943 $(warning "Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel") 944 endif 945 SKIP_STACK_VALIDATION := 1 946 export SKIP_STACK_VALIDATION 947 endif 948endif 949 950 951ifeq ($(KBUILD_EXTMOD),) 952core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/ 953 954vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \ 955 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 956 $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y))) 957 958vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \ 959 $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-)))) 960 961init-y := $(patsubst %/, %/built-in.a, $(init-y)) 962core-y := $(patsubst %/, %/built-in.a, $(core-y)) 963drivers-y := $(patsubst %/, %/built-in.a, $(drivers-y)) 964net-y := $(patsubst %/, %/built-in.a, $(net-y)) 965libs-y1 := $(patsubst %/, %/lib.a, $(libs-y)) 966libs-y2 := $(patsubst %/, %/built-in.a, $(filter-out %.a, $(libs-y))) 967virt-y := $(patsubst %/, %/built-in.a, $(virt-y)) 968 969# Externally visible symbols (used by link-vmlinux.sh) 970export KBUILD_VMLINUX_INIT := $(head-y) $(init-y) 971export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y2) $(drivers-y) $(net-y) $(virt-y) 972export KBUILD_VMLINUX_LIBS := $(libs-y1) 973export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 974export LDFLAGS_vmlinux 975# used by scripts/package/Makefile 976export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools) 977 978vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) $(KBUILD_VMLINUX_LIBS) 979 980# Recurse until adjust_autoksyms.sh is satisfied 981PHONY += autoksyms_recursive 982autoksyms_recursive: $(vmlinux-deps) 983ifdef CONFIG_TRIM_UNUSED_KSYMS 984 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ 985 "$(MAKE) -f $(srctree)/Makefile vmlinux" 986endif 987 988# For the kernel to actually contain only the needed exported symbols, 989# we have to build modules as well to determine what those symbols are. 990# (this can be evaluated only once include/config/auto.conf has been included) 991ifdef CONFIG_TRIM_UNUSED_KSYMS 992 KBUILD_MODULES := 1 993endif 994 995autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h) 996 997$(autoksyms_h): 998 $(Q)mkdir -p $(dir $@) 999 $(Q)touch $@ 1000 1001ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink) 1002 1003# Final link of vmlinux with optional arch pass after final link 1004cmd_link-vmlinux = \ 1005 $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) ; \ 1006 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) 1007 1008vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE 1009ifdef CONFIG_HEADERS_CHECK 1010 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check 1011endif 1012ifdef CONFIG_GDB_SCRIPTS 1013 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1014endif 1015 +$(call if_changed,link-vmlinux) 1016 1017# Build samples along the rest of the kernel 1018ifdef CONFIG_SAMPLES 1019vmlinux-dirs += samples 1020endif 1021 1022# The actual objects are generated when descending, 1023# make sure no implicit rule kicks in 1024$(sort $(vmlinux-deps)): $(vmlinux-dirs) ; 1025 1026# Handle descending into subdirectories listed in $(vmlinux-dirs) 1027# Preset locale variables to speed up the build process. Limit locale 1028# tweaks to this spot to avoid wrong language settings when running 1029# make menuconfig etc. 1030# Error messages still appears in the original language 1031 1032PHONY += $(vmlinux-dirs) 1033$(vmlinux-dirs): prepare scripts 1034 $(Q)$(MAKE) $(build)=$@ need-builtin=1 1035 1036define filechk_kernel.release 1037 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1038endef 1039 1040# Store (new) KERNELRELEASE string in include/config/kernel.release 1041include/config/kernel.release: include/config/auto.conf FORCE 1042 $(call filechk,kernel.release) 1043 1044# Additional helpers built in scripts/ 1045# Carefully list dependencies so we do not try to build scripts twice 1046# in parallel 1047PHONY += scripts 1048scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \ 1049 asm-generic gcc-plugins $(autoksyms_h) 1050 $(Q)$(MAKE) $(build)=$(@) 1051 1052# Things we need to do before we recursively start building the kernel 1053# or the modules are listed in "prepare". 1054# A multi level approach is used. prepareN is processed before prepareN-1. 1055# archprepare is used in arch Makefiles and when processed asm symlink, 1056# version.h and scripts_basic is processed / created. 1057 1058# Listed in dependency order 1059PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3 1060 1061# prepare3 is used to check if we are building in a separate output directory, 1062# and if so do: 1063# 1) Check that make has not been executed in the kernel src $(srctree) 1064prepare3: include/config/kernel.release 1065ifneq ($(KBUILD_SRC),) 1066 @$(kecho) ' Using $(srctree) as source for kernel' 1067 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \ 1068 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \ 1069 echo >&2 " in the '$(srctree)' directory.";\ 1070 /bin/false; \ 1071 fi; 1072endif 1073 1074# prepare2 creates a makefile if using a separate output directory. 1075# From this point forward, .config has been reprocessed, so any rules 1076# that need to depend on updated CONFIG_* values can be checked here. 1077prepare2: prepare3 outputmakefile asm-generic 1078 1079prepare1: prepare2 $(version_h) $(autoksyms_h) include/generated/utsrelease.h \ 1080 include/config/auto.conf 1081 $(cmd_crmodverdir) 1082 1083archprepare: archheaders archscripts prepare1 scripts_basic 1084 1085prepare0: archprepare gcc-plugins 1086 $(Q)$(MAKE) $(build)=. 1087 1088# All the preparing.. 1089prepare: prepare0 prepare-objtool 1090 1091# Support for using generic headers in asm-generic 1092PHONY += asm-generic uapi-asm-generic 1093asm-generic: uapi-asm-generic 1094 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \ 1095 src=asm obj=arch/$(SRCARCH)/include/generated/asm 1096uapi-asm-generic: 1097 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \ 1098 src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm 1099 1100PHONY += prepare-objtool 1101prepare-objtool: $(objtool_target) 1102 1103# Generate some files 1104# --------------------------------------------------------------------------- 1105 1106# KERNELRELEASE can change from a few different places, meaning version.h 1107# needs to be updated, so this check is forced on all builds 1108 1109uts_len := 64 1110define filechk_utsrelease.h 1111 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1112 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1113 exit 1; \ 1114 fi; \ 1115 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";) 1116endef 1117 1118define filechk_version.h 1119 (echo \#define LINUX_VERSION_CODE $(shell \ 1120 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \ 1121 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';) 1122endef 1123 1124$(version_h): $(srctree)/Makefile FORCE 1125 $(call filechk,version.h) 1126 $(Q)rm -f $(old_version_h) 1127 1128include/generated/utsrelease.h: include/config/kernel.release FORCE 1129 $(call filechk,utsrelease.h) 1130 1131PHONY += headerdep 1132headerdep: 1133 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1134 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1135 1136# --------------------------------------------------------------------------- 1137# Kernel headers 1138 1139#Default location for installed headers 1140export INSTALL_HDR_PATH = $(objtree)/usr 1141 1142# If we do an all arch process set dst to include/arch-$(SRCARCH) 1143hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(SRCARCH), dst=include) 1144 1145PHONY += archheaders 1146archheaders: 1147 1148PHONY += archscripts 1149archscripts: 1150 1151PHONY += __headers 1152__headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts 1153 $(Q)$(MAKE) $(build)=scripts build_unifdef 1154 1155PHONY += headers_install_all 1156headers_install_all: 1157 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install 1158 1159PHONY += headers_install 1160headers_install: __headers 1161 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \ 1162 $(error Headers not exportable for the $(SRCARCH) architecture)) 1163 $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include 1164 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) 1165 1166PHONY += headers_check_all 1167headers_check_all: headers_install_all 1168 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check 1169 1170PHONY += headers_check 1171headers_check: headers_install 1172 $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1 1173 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) HDRCHECK=1 1174 1175# --------------------------------------------------------------------------- 1176# Kernel selftest 1177 1178PHONY += kselftest 1179kselftest: 1180 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1181 1182PHONY += kselftest-clean 1183kselftest-clean: 1184 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean 1185 1186PHONY += kselftest-merge 1187kselftest-merge: 1188 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1189 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \ 1190 -m $(objtree)/.config \ 1191 $(srctree)/tools/testing/selftests/*/config 1192 +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1193 1194# --------------------------------------------------------------------------- 1195# Modules 1196 1197ifdef CONFIG_MODULES 1198 1199# By default, build modules as well 1200 1201all: modules 1202 1203# Build modules 1204# 1205# A module can be listed more than once in obj-m resulting in 1206# duplicate lines in modules.order files. Those are removed 1207# using awk while concatenating to the final file. 1208 1209PHONY += modules 1210modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin 1211 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order 1212 @$(kecho) ' Building modules, stage 2.'; 1213 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1214 1215modules.builtin: $(vmlinux-dirs:%=%/modules.builtin) 1216 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin 1217 1218%/modules.builtin: include/config/auto.conf 1219 $(Q)$(MAKE) $(modbuiltin)=$* 1220 1221 1222# Target to prepare building external modules 1223PHONY += modules_prepare 1224modules_prepare: prepare scripts 1225 1226# Target to install modules 1227PHONY += modules_install 1228modules_install: _modinst_ _modinst_post 1229 1230PHONY += _modinst_ 1231_modinst_: 1232 @rm -rf $(MODLIB)/kernel 1233 @rm -f $(MODLIB)/source 1234 @mkdir -p $(MODLIB)/kernel 1235 @ln -s $(abspath $(srctree)) $(MODLIB)/source 1236 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1237 rm -f $(MODLIB)/build ; \ 1238 ln -s $(CURDIR) $(MODLIB)/build ; \ 1239 fi 1240 @cp -f $(objtree)/modules.order $(MODLIB)/ 1241 @cp -f $(objtree)/modules.builtin $(MODLIB)/ 1242 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1243 1244# This depmod is only for convenience to give the initial 1245# boot a modules.dep even before / is mounted read-write. However the 1246# boot script depmod is the master version. 1247PHONY += _modinst_post 1248_modinst_post: _modinst_ 1249 $(call cmd,depmod) 1250 1251ifeq ($(CONFIG_MODULE_SIG), y) 1252PHONY += modules_sign 1253modules_sign: 1254 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign 1255endif 1256 1257else # CONFIG_MODULES 1258 1259# Modules not configured 1260# --------------------------------------------------------------------------- 1261 1262PHONY += modules modules_install 1263modules modules_install: 1264 @echo >&2 1265 @echo >&2 "The present kernel configuration has modules disabled." 1266 @echo >&2 "Type 'make config' and enable loadable module support." 1267 @echo >&2 "Then build a kernel with module support enabled." 1268 @echo >&2 1269 @exit 1 1270 1271endif # CONFIG_MODULES 1272 1273### 1274# Cleaning is done on three levels. 1275# make clean Delete most generated files 1276# Leave enough to build external modules 1277# make mrproper Delete the current configuration, and all generated files 1278# make distclean Remove editor backup files, patch leftover files and the like 1279 1280# Directories & files removed with 'make clean' 1281CLEAN_DIRS += $(MODVERDIR) include/ksym 1282 1283# Directories & files removed with 'make mrproper' 1284MRPROPER_DIRS += include/config usr/include include/generated \ 1285 arch/*/include/generated .tmp_objdiff 1286MRPROPER_FILES += .config .config.old .version \ 1287 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \ 1288 signing_key.pem signing_key.priv signing_key.x509 \ 1289 x509.genkey extra_certificates signing_key.x509.keyid \ 1290 signing_key.x509.signer vmlinux-gdb.py 1291 1292# clean - Delete most, but leave enough to build external modules 1293# 1294clean: rm-dirs := $(CLEAN_DIRS) 1295clean: rm-files := $(CLEAN_FILES) 1296clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples) 1297 1298PHONY += $(clean-dirs) clean archclean vmlinuxclean 1299$(clean-dirs): 1300 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1301 1302vmlinuxclean: 1303 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1304 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1305 1306clean: archclean vmlinuxclean 1307 1308# mrproper - Delete all generated files, including .config 1309# 1310mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS)) 1311mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1312mrproper-dirs := $(addprefix _mrproper_,scripts) 1313 1314PHONY += $(mrproper-dirs) mrproper archmrproper 1315$(mrproper-dirs): 1316 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1317 1318mrproper: clean archmrproper $(mrproper-dirs) 1319 $(call cmd,rmdirs) 1320 $(call cmd,rmfiles) 1321 1322# distclean 1323# 1324PHONY += distclean 1325 1326distclean: mrproper 1327 @find $(srctree) $(RCS_FIND_IGNORE) \ 1328 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1329 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1330 -o -name 'core' \) \ 1331 -type f -print | xargs rm -f 1332 1333 1334# Packaging of the kernel to various formats 1335# --------------------------------------------------------------------------- 1336# rpm target kept for backward compatibility 1337package-dir := scripts/package 1338 1339%src-pkg: FORCE 1340 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1341%pkg: include/config/kernel.release FORCE 1342 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1343rpm: rpm-pkg 1344 @echo " WARNING: \"rpm\" target will be removed after Linux 4.18" 1345 @echo " Please use \"rpm-pkg\" instead." 1346 1347 1348# Brief documentation of the typical targets used 1349# --------------------------------------------------------------------------- 1350 1351boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1352boards := $(sort $(notdir $(boards))) 1353board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1354board-dirs := $(sort $(notdir $(board-dirs:/=))) 1355 1356PHONY += help 1357help: 1358 @echo 'Cleaning targets:' 1359 @echo ' clean - Remove most generated files but keep the config and' 1360 @echo ' enough build support to build external modules' 1361 @echo ' mrproper - Remove all generated files + config + various backup files' 1362 @echo ' distclean - mrproper + remove editor backup and patch files' 1363 @echo '' 1364 @echo 'Configuration targets:' 1365 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1366 @echo '' 1367 @echo 'Other generic targets:' 1368 @echo ' all - Build all targets marked with [*]' 1369 @echo '* vmlinux - Build the bare kernel' 1370 @echo '* modules - Build all modules' 1371 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1372 @echo ' dir/ - Build all files in dir and below' 1373 @echo ' dir/file.[ois] - Build specified target only' 1374 @echo ' dir/file.ll - Build the LLVM assembly file' 1375 @echo ' (requires compiler support for LLVM assembly generation)' 1376 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1377 @echo ' (requires a recent binutils and recent build (System.map))' 1378 @echo ' dir/file.ko - Build module including final link' 1379 @echo ' modules_prepare - Set up for building external modules' 1380 @echo ' tags/TAGS - Generate tags file for editors' 1381 @echo ' cscope - Generate cscope index' 1382 @echo ' gtags - Generate GNU GLOBAL index' 1383 @echo ' kernelrelease - Output the release version string (use with make -s)' 1384 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1385 @echo ' image_name - Output the image name (use with make -s)' 1386 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1387 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1388 echo '' 1389 @echo 'Static analysers:' 1390 @echo ' checkstack - Generate a list of stack hogs' 1391 @echo ' namespacecheck - Name space analysis on compiled kernel' 1392 @echo ' versioncheck - Sanity check on version.h usage' 1393 @echo ' includecheck - Check for duplicate included header files' 1394 @echo ' export_report - List the usages of all exported symbols' 1395 @echo ' headers_check - Sanity check on exported headers' 1396 @echo ' headerdep - Detect inclusion cycles in headers' 1397 @echo ' coccicheck - Check with Coccinelle' 1398 @echo '' 1399 @echo 'Kernel selftest:' 1400 @echo ' kselftest - Build and run kernel selftest (run as root)' 1401 @echo ' Build, install, and boot kernel before' 1402 @echo ' running kselftest on it' 1403 @echo ' kselftest-clean - Remove all generated kselftest files' 1404 @echo ' kselftest-merge - Merge all the config dependencies of kselftest to existing' 1405 @echo ' .config.' 1406 @echo '' 1407 @echo 'Userspace tools targets:' 1408 @echo ' use "make tools/help"' 1409 @echo ' or "cd tools; make help"' 1410 @echo '' 1411 @echo 'Kernel packaging:' 1412 @$(MAKE) $(build)=$(package-dir) help 1413 @echo '' 1414 @echo 'Documentation targets:' 1415 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1416 @echo '' 1417 @echo 'Architecture specific targets ($(SRCARCH)):' 1418 @$(if $(archhelp),$(archhelp),\ 1419 echo ' No architecture specific help defined for $(SRCARCH)') 1420 @echo '' 1421 @$(if $(boards), \ 1422 $(foreach b, $(boards), \ 1423 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1424 echo '') 1425 @$(if $(board-dirs), \ 1426 $(foreach b, $(board-dirs), \ 1427 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1428 printf " %-16s - Show all of the above\\n" help-boards; \ 1429 echo '') 1430 1431 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1432 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1433 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1434 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK (sparse by default)' 1435 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1436 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1437 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where' 1438 @echo ' 1: warnings which may be relevant and do not occur too often' 1439 @echo ' 2: warnings which occur quite often but may still be relevant' 1440 @echo ' 3: more obscure warnings, can most likely be ignored' 1441 @echo ' Multiple levels can be combined with W=12 or W=123' 1442 @echo '' 1443 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1444 @echo 'For further info see the ./README file' 1445 1446 1447help-board-dirs := $(addprefix help-,$(board-dirs)) 1448 1449help-boards: $(help-board-dirs) 1450 1451boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1452 1453$(help-board-dirs): help-%: 1454 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1455 @$(if $(boards-per-dir), \ 1456 $(foreach b, $(boards-per-dir), \ 1457 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1458 echo '') 1459 1460 1461# Documentation targets 1462# --------------------------------------------------------------------------- 1463DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1464 linkcheckdocs dochelp refcheckdocs 1465PHONY += $(DOC_TARGETS) 1466$(DOC_TARGETS): scripts_basic FORCE 1467 $(Q)$(MAKE) $(build)=Documentation $@ 1468 1469else # KBUILD_EXTMOD 1470 1471### 1472# External module support. 1473# When building external modules the kernel used as basis is considered 1474# read-only, and no consistency checks are made and the make 1475# system is not used on the basis kernel. If updates are required 1476# in the basis kernel ordinary make commands (without M=...) must 1477# be used. 1478# 1479# The following are the only valid targets when building external 1480# modules. 1481# make M=dir clean Delete all automatically generated files 1482# make M=dir modules Make all modules in specified dir 1483# make M=dir Same as 'make M=dir modules' 1484# make M=dir modules_install 1485# Install the modules built in the module directory 1486# Assumes install directory is already created 1487 1488# We are always building modules 1489KBUILD_MODULES := 1 1490PHONY += crmodverdir 1491crmodverdir: 1492 $(cmd_crmodverdir) 1493 1494PHONY += $(objtree)/Module.symvers 1495$(objtree)/Module.symvers: 1496 @test -e $(objtree)/Module.symvers || ( \ 1497 echo; \ 1498 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \ 1499 echo " is missing; modules will have no dependencies and modversions."; \ 1500 echo ) 1501 1502module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD)) 1503PHONY += $(module-dirs) modules 1504$(module-dirs): crmodverdir $(objtree)/Module.symvers 1505 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@) 1506 1507modules: $(module-dirs) 1508 @$(kecho) ' Building modules, stage 2.'; 1509 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1510 1511PHONY += modules_install 1512modules_install: _emodinst_ _emodinst_post 1513 1514install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra) 1515PHONY += _emodinst_ 1516_emodinst_: 1517 $(Q)mkdir -p $(MODLIB)/$(install-dir) 1518 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1519 1520PHONY += _emodinst_post 1521_emodinst_post: _emodinst_ 1522 $(call cmd,depmod) 1523 1524clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD)) 1525 1526PHONY += $(clean-dirs) clean 1527$(clean-dirs): 1528 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1529 1530clean: rm-dirs := $(MODVERDIR) 1531clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers 1532 1533PHONY += help 1534help: 1535 @echo ' Building external modules.' 1536 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1537 @echo '' 1538 @echo ' modules - default target, build the module(s)' 1539 @echo ' modules_install - install the module' 1540 @echo ' clean - remove generated files in module directory only' 1541 @echo '' 1542 1543# Dummies... 1544PHONY += prepare scripts 1545prepare: ; 1546scripts: ; 1547endif # KBUILD_EXTMOD 1548 1549clean: $(clean-dirs) 1550 $(call cmd,rmdirs) 1551 $(call cmd,rmfiles) 1552 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1553 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \ 1554 -o -name '*.ko.*' -o -name '*.dtb' -o -name '*.dtb.S' \ 1555 -o -name '*.dwo' -o -name '*.lst' \ 1556 -o -name '*.su' \ 1557 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1558 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 1559 -o -name '*.asn1.[ch]' \ 1560 -o -name '*.symtypes' -o -name 'modules.order' \ 1561 -o -name modules.builtin -o -name '.tmp_*.o.*' \ 1562 -o -name '*.c.[012]*.*' \ 1563 -o -name '*.ll' \ 1564 -o -name '*.gcno' \) -type f -print | xargs rm -f 1565 1566# Generate tags for editors 1567# --------------------------------------------------------------------------- 1568quiet_cmd_tags = GEN $@ 1569 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@ 1570 1571tags TAGS cscope gtags: FORCE 1572 $(call cmd,tags) 1573 1574# Scripts to check various things for consistency 1575# --------------------------------------------------------------------------- 1576 1577PHONY += includecheck versioncheck coccicheck namespacecheck export_report 1578 1579includecheck: 1580 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1581 -name '*.[hcS]' -type f -print | sort \ 1582 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1583 1584versioncheck: 1585 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1586 -name '*.[hcS]' -type f -print | sort \ 1587 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1588 1589coccicheck: 1590 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@ 1591 1592namespacecheck: 1593 $(PERL) $(srctree)/scripts/namespace.pl 1594 1595export_report: 1596 $(PERL) $(srctree)/scripts/export_report.pl 1597 1598endif #ifeq ($(config-targets),1) 1599endif #ifeq ($(mixed-targets),1) 1600 1601PHONY += checkstack kernelrelease kernelversion image_name 1602 1603# UML needs a little special treatment here. It wants to use the host 1604# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1605# else wants $(ARCH), including people doing cross-builds, which means 1606# that $(SUBARCH) doesn't work here. 1607ifeq ($(ARCH), um) 1608CHECKSTACK_ARCH := $(SUBARCH) 1609else 1610CHECKSTACK_ARCH := $(ARCH) 1611endif 1612checkstack: 1613 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1614 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1615 1616kernelrelease: 1617 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1618 1619kernelversion: 1620 @echo $(KERNELVERSION) 1621 1622image_name: 1623 @echo $(KBUILD_IMAGE) 1624 1625# Clear a bunch of variables before executing the submake 1626tools/: FORCE 1627 $(Q)mkdir -p $(objtree)/tools 1628 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ 1629 1630tools/%: FORCE 1631 $(Q)mkdir -p $(objtree)/tools 1632 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $* 1633 1634# Single targets 1635# --------------------------------------------------------------------------- 1636# Single targets are compatible with: 1637# - build with mixed source and output 1638# - build with separate output dir 'make O=...' 1639# - external modules 1640# 1641# target-dir => where to store outputfile 1642# build-dir => directory in kernel source tree to use 1643 1644ifeq ($(KBUILD_EXTMOD),) 1645 build-dir = $(patsubst %/,%,$(dir $@)) 1646 target-dir = $(dir $@) 1647else 1648 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@))) 1649 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash)) 1650 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@)) 1651endif 1652 1653%.s: %.c prepare scripts FORCE 1654 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1655%.i: %.c prepare scripts FORCE 1656 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1657%.o: %.c prepare scripts FORCE 1658 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1659%.lst: %.c prepare scripts FORCE 1660 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1661%.s: %.S prepare scripts FORCE 1662 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1663%.o: %.S prepare scripts FORCE 1664 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1665%.symtypes: %.c prepare scripts FORCE 1666 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1667%.ll: %.c prepare scripts FORCE 1668 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1669 1670# Modules 1671/: prepare scripts FORCE 1672 $(cmd_crmodverdir) 1673 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1674 $(build)=$(build-dir) 1675# Make sure the latest headers are built for Documentation 1676Documentation/ samples/: headers_install 1677%/: prepare scripts FORCE 1678 $(cmd_crmodverdir) 1679 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1680 $(build)=$(build-dir) 1681%.ko: prepare scripts FORCE 1682 $(cmd_crmodverdir) 1683 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1684 $(build)=$(build-dir) $(@:.ko=.o) 1685 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1686 1687# FIXME Should go into a make.lib or something 1688# =========================================================================== 1689 1690quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs))) 1691 cmd_rmdirs = rm -rf $(rm-dirs) 1692 1693quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1694 cmd_rmfiles = rm -f $(rm-files) 1695 1696# Run depmod only if we have System.map and depmod is executable 1697quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) 1698 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1699 $(KERNELRELEASE) 1700 1701# Create temporary dir for module support files 1702# clean it up only when building all modules 1703cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \ 1704 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*) 1705 1706# read all saved command lines 1707 1708cmd_files := $(wildcard .*.cmd $(foreach f,$(sort $(targets)),$(dir $(f)).$(notdir $(f)).cmd)) 1709 1710ifneq ($(cmd_files),) 1711 $(cmd_files): ; # Do not try to update included dependency files 1712 include $(cmd_files) 1713endif 1714 1715endif # skip-makefile 1716 1717PHONY += FORCE 1718FORCE: 1719 1720# Declare the contents of the .PHONY variable as phony. We keep that 1721# information in a variable so we can use it in if_changed and friends. 1722.PHONY: $(PHONY) 1723