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