1# SPDX-License-Identifier: GPL-2.0 2VERSION = 4 3PATCHLEVEL = 14 4SUBLEVEL = 0 5EXTRAVERSION = 6NAME = Fearless Coyote 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.o 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 223no-dot-config-targets := clean mrproper distclean \ 224 cscope gtags TAGS tags help% %docs check% coccicheck \ 225 $(version_h) headers_% archheaders archscripts \ 226 kernelversion %src-pkg 227 228config-targets := 0 229mixed-targets := 0 230dot-config := 1 231 232ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 233 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 234 dot-config := 0 235 endif 236endif 237 238ifeq ($(KBUILD_EXTMOD),) 239 ifneq ($(filter config %config,$(MAKECMDGOALS)),) 240 config-targets := 1 241 ifneq ($(words $(MAKECMDGOALS)),1) 242 mixed-targets := 1 243 endif 244 endif 245endif 246# install and modules_install need also be processed one by one 247ifneq ($(filter install,$(MAKECMDGOALS)),) 248 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 249 mixed-targets := 1 250 endif 251endif 252 253ifeq ($(mixed-targets),1) 254# =========================================================================== 255# We're called with mixed targets (*config and build targets). 256# Handle them one by one. 257 258PHONY += $(MAKECMDGOALS) __build_one_by_one 259 260$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one 261 @: 262 263__build_one_by_one: 264 $(Q)set -e; \ 265 for i in $(MAKECMDGOALS); do \ 266 $(MAKE) -f $(srctree)/Makefile $$i; \ 267 done 268 269else 270 271# We need some generic definitions (do not try to remake the file). 272scripts/Kbuild.include: ; 273include scripts/Kbuild.include 274 275# Read KERNELRELEASE from include/config/kernel.release (if it exists) 276KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null) 277KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 278export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 279 280# SUBARCH tells the usermode build what the underlying arch is. That is set 281# first, and if a usermode build is happening, the "ARCH=um" on the command 282# line overrides the setting of ARCH below. If a native build is happening, 283# then ARCH is assigned, getting whatever value it gets normally, and 284# SUBARCH is subsequently ignored. 285 286SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \ 287 -e s/sun4u/sparc64/ \ 288 -e s/arm.*/arm/ -e s/sa110/arm/ \ 289 -e s/s390x/s390/ -e s/parisc64/parisc/ \ 290 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \ 291 -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ \ 292 -e s/riscv.*/riscv/) 293 294# Cross compiling and selecting different set of gcc/bin-utils 295# --------------------------------------------------------------------------- 296# 297# When performing cross compilation for other architectures ARCH shall be set 298# to the target architecture. (See arch/* for the possibilities). 299# ARCH can be set during invocation of make: 300# make ARCH=ia64 301# Another way is to have ARCH set in the environment. 302# The default ARCH is the host where make is executed. 303 304# CROSS_COMPILE specify the prefix used for all executables used 305# during compilation. Only gcc and related bin-utils executables 306# are prefixed with $(CROSS_COMPILE). 307# CROSS_COMPILE can be set on the command line 308# make CROSS_COMPILE=ia64-linux- 309# Alternatively CROSS_COMPILE can be set in the environment. 310# A third alternative is to store a setting in .config so that plain 311# "make" in the configured kernel build directory always uses that. 312# Default value for CROSS_COMPILE is not to prefix executables 313# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 314ARCH ?= $(SUBARCH) 315CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%) 316 317# Architecture as present in compile.h 318UTS_MACHINE := $(ARCH) 319SRCARCH := $(ARCH) 320 321# Additional ARCH settings for x86 322ifeq ($(ARCH),i386) 323 SRCARCH := x86 324endif 325ifeq ($(ARCH),x86_64) 326 SRCARCH := x86 327endif 328 329# Additional ARCH settings for sparc 330ifeq ($(ARCH),sparc32) 331 SRCARCH := sparc 332endif 333ifeq ($(ARCH),sparc64) 334 SRCARCH := sparc 335endif 336 337# Additional ARCH settings for sh 338ifeq ($(ARCH),sh64) 339 SRCARCH := sh 340endif 341 342# Additional ARCH settings for tile 343ifeq ($(ARCH),tilepro) 344 SRCARCH := tile 345endif 346ifeq ($(ARCH),tilegx) 347 SRCARCH := tile 348endif 349 350KCONFIG_CONFIG ?= .config 351export KCONFIG_CONFIG 352 353# SHELL used by kbuild 354CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \ 355 else if [ -x /bin/bash ]; then echo /bin/bash; \ 356 else echo sh; fi ; fi) 357 358HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS) 359HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS) 360HOST_LFS_LIBS := $(shell getconf LFS_LIBS) 361 362HOSTCC = gcc 363HOSTCXX = g++ 364HOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \ 365 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) 366HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS) 367HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) 368HOST_LOADLIBES := $(HOST_LFS_LIBS) 369 370# Make variables (CC, etc...) 371AS = $(CROSS_COMPILE)as 372LD = $(CROSS_COMPILE)ld 373CC = $(CROSS_COMPILE)gcc 374CPP = $(CC) -E 375AR = $(CROSS_COMPILE)ar 376NM = $(CROSS_COMPILE)nm 377STRIP = $(CROSS_COMPILE)strip 378OBJCOPY = $(CROSS_COMPILE)objcopy 379OBJDUMP = $(CROSS_COMPILE)objdump 380AWK = awk 381GENKSYMS = scripts/genksyms/genksyms 382INSTALLKERNEL := installkernel 383DEPMOD = /sbin/depmod 384PERL = perl 385PYTHON = python 386CHECK = sparse 387 388CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 389 -Wbitwise -Wno-return-void $(CF) 390NOSTDINC_FLAGS = 391CFLAGS_MODULE = 392AFLAGS_MODULE = 393LDFLAGS_MODULE = 394CFLAGS_KERNEL = 395AFLAGS_KERNEL = 396LDFLAGS_vmlinux = 397 398# Use USERINCLUDE when you must reference the UAPI directories only. 399USERINCLUDE := \ 400 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 401 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 402 -I$(srctree)/include/uapi \ 403 -I$(objtree)/include/generated/uapi \ 404 -include $(srctree)/include/linux/kconfig.h 405 406# Use LINUXINCLUDE when you must reference the include/ directory. 407# Needed to be compatible with the O= option 408LINUXINCLUDE := \ 409 -I$(srctree)/arch/$(SRCARCH)/include \ 410 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 411 $(if $(KBUILD_SRC), -I$(srctree)/include) \ 412 -I$(objtree)/include \ 413 $(USERINCLUDE) 414 415KBUILD_AFLAGS := -D__ASSEMBLY__ 416KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \ 417 -fno-strict-aliasing -fno-common -fshort-wchar \ 418 -Werror-implicit-function-declaration \ 419 -Wno-format-security \ 420 -std=gnu89 421KBUILD_CPPFLAGS := -D__KERNEL__ 422KBUILD_AFLAGS_KERNEL := 423KBUILD_CFLAGS_KERNEL := 424KBUILD_AFLAGS_MODULE := -DMODULE 425KBUILD_CFLAGS_MODULE := -DMODULE 426KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds 427GCC_PLUGINS_CFLAGS := 428 429export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC 430export CPP AR NM STRIP OBJCOPY OBJDUMP HOSTLDFLAGS HOST_LOADLIBES 431export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE 432export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS 433 434export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS 435export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_KASAN CFLAGS_UBSAN 436export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 437export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 438export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 439export KBUILD_ARFLAGS 440 441# When compiling out-of-tree modules, put MODVERDIR in the module 442# tree rather than in the kernel tree. The kernel tree might 443# even be read-only. 444export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions 445 446# Files to ignore in find ... statements 447 448export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 449 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 450 -prune -o 451export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 452 --exclude CVS --exclude .pc --exclude .hg --exclude .git 453 454# =========================================================================== 455# Rules shared between *config targets and build targets 456 457# Basic helpers built in scripts/basic/ 458PHONY += scripts_basic 459scripts_basic: 460 $(Q)$(MAKE) $(build)=scripts/basic 461 $(Q)rm -f .tmp_quiet_recordmcount 462 463# To avoid any implicit rule to kick in, define an empty command. 464scripts/basic/%: scripts_basic ; 465 466PHONY += outputmakefile 467# outputmakefile generates a Makefile in the output directory, if using a 468# separate output directory. This allows convenient use of make in the 469# output directory. 470outputmakefile: 471ifneq ($(KBUILD_SRC),) 472 $(Q)ln -fsn $(srctree) source 473 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \ 474 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL) 475endif 476 477ifeq ($(config-targets),1) 478# =========================================================================== 479# *config targets only - make sure prerequisites are updated, and descend 480# in scripts/kconfig to make the *config target 481 482# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 483# KBUILD_DEFCONFIG may point out an alternative default configuration 484# used for 'make defconfig' 485include arch/$(SRCARCH)/Makefile 486export KBUILD_DEFCONFIG KBUILD_KCONFIG 487 488config: scripts_basic outputmakefile FORCE 489 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 490 491%config: scripts_basic outputmakefile FORCE 492 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 493 494else 495# =========================================================================== 496# Build targets only - this includes vmlinux, arch specific targets, clean 497# targets and others. In general all targets except *config targets. 498 499# If building an external module we do not care about the all: rule 500# but instead _all depend on modules 501PHONY += all 502ifeq ($(KBUILD_EXTMOD),) 503_all: all 504else 505_all: modules 506endif 507 508# Decide whether to build built-in, modular, or both. 509# Normally, just do built-in. 510 511KBUILD_MODULES := 512KBUILD_BUILTIN := 1 513 514# If we have only "make modules", don't compile built-in objects. 515# When we're building modules with modversions, we need to consider 516# the built-in objects during the descend as well, in order to 517# make sure the checksums are up to date before we record them. 518 519ifeq ($(MAKECMDGOALS),modules) 520 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1) 521endif 522 523# If we have "make <whatever> modules", compile modules 524# in addition to whatever we do anyway. 525# Just "make" or "make all" shall build modules as well 526 527ifneq ($(filter all _all modules,$(MAKECMDGOALS)),) 528 KBUILD_MODULES := 1 529endif 530 531ifeq ($(MAKECMDGOALS),) 532 KBUILD_MODULES := 1 533endif 534 535export KBUILD_MODULES KBUILD_BUILTIN 536 537ifeq ($(KBUILD_EXTMOD),) 538# Additional helpers built in scripts/ 539# Carefully list dependencies so we do not try to build scripts twice 540# in parallel 541PHONY += scripts 542scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \ 543 asm-generic gcc-plugins 544 $(Q)$(MAKE) $(build)=$(@) 545 546# Objects we will link into vmlinux / subdirs we need to visit 547init-y := init/ 548drivers-y := drivers/ sound/ firmware/ 549net-y := net/ 550libs-y := lib/ 551core-y := usr/ 552virt-y := virt/ 553endif # KBUILD_EXTMOD 554 555ifeq ($(dot-config),1) 556# Read in config 557-include include/config/auto.conf 558 559ifeq ($(KBUILD_EXTMOD),) 560# Read in dependencies to all Kconfig* files, make sure to run 561# oldconfig if changes are detected. 562-include include/config/auto.conf.cmd 563 564# To avoid any implicit rule to kick in, define an empty command 565$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ; 566 567# If .config is newer than include/config/auto.conf, someone tinkered 568# with it and forgot to run make oldconfig. 569# if auto.conf.cmd is missing then we are probably in a cleaned tree so 570# we execute the config step to be sure to catch updated Kconfig files 571include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd 572 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig 573else 574# external modules needs include/generated/autoconf.h and include/config/auto.conf 575# but do not care if they are up-to-date. Use auto.conf to trigger the test 576PHONY += include/config/auto.conf 577 578include/config/auto.conf: 579 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 580 echo >&2; \ 581 echo >&2 " ERROR: Kernel configuration is invalid."; \ 582 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 583 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 584 echo >&2 ; \ 585 /bin/false) 586 587endif # KBUILD_EXTMOD 588 589else 590# Dummy target needed, because used as prerequisite 591include/config/auto.conf: ; 592endif # $(dot-config) 593 594# For the kernel to actually contain only the needed exported symbols, 595# we have to build modules as well to determine what those symbols are. 596# (this can be evaluated only once include/config/auto.conf has been included) 597ifdef CONFIG_TRIM_UNUSED_KSYMS 598 KBUILD_MODULES := 1 599endif 600 601# The all: target is the default when no target is given on the 602# command line. 603# This allow a user to issue only 'make' to build a kernel including modules 604# Defaults to vmlinux, but the arch makefile usually adds further targets 605all: vmlinux 606 607KBUILD_CFLAGS += $(call cc-option,-fno-PIE) 608KBUILD_AFLAGS += $(call cc-option,-fno-PIE) 609CFLAGS_GCOV := -fprofile-arcs -ftest-coverage -fno-tree-loop-im $(call cc-disable-warning,maybe-uninitialized,) 610export CFLAGS_GCOV CFLAGS_KCOV 611 612# The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default 613# values of the respective KBUILD_* variables 614ARCH_CPPFLAGS := 615ARCH_AFLAGS := 616ARCH_CFLAGS := 617include arch/$(SRCARCH)/Makefile 618 619KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,) 620KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) 621KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) 622KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) 623KBUILD_CFLAGS += $(call cc-disable-warning, int-in-bool-context) 624 625ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 626KBUILD_CFLAGS += $(call cc-option,-Oz,-Os) 627KBUILD_CFLAGS += $(call cc-disable-warning,maybe-uninitialized,) 628else 629ifdef CONFIG_PROFILE_ALL_BRANCHES 630KBUILD_CFLAGS += -O2 $(call cc-disable-warning,maybe-uninitialized,) 631else 632KBUILD_CFLAGS += -O2 633endif 634endif 635 636KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \ 637 $(call cc-disable-warning,maybe-uninitialized,)) 638 639# Tell gcc to never replace conditional load with a non-conditional one 640KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 641 642# check for 'asm goto' 643ifeq ($(call shell-cached,$(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y) 644 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO 645 KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO 646endif 647 648include scripts/Makefile.kcov 649include scripts/Makefile.gcc-plugins 650 651ifdef CONFIG_READABLE_ASM 652# Disable optimizations that make assembler listings hard to read. 653# reorder blocks reorders the control in the function 654# ipa clone creates specialized cloned functions 655# partial inlining inlines only parts of functions 656KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \ 657 $(call cc-option,-fno-ipa-cp-clone,) \ 658 $(call cc-option,-fno-partial-inlining) 659endif 660 661ifneq ($(CONFIG_FRAME_WARN),0) 662KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN}) 663endif 664 665# This selects the stack protector compiler flag. Testing it is delayed 666# until after .config has been reprocessed, in the prepare-compiler-check 667# target. 668ifdef CONFIG_CC_STACKPROTECTOR_REGULAR 669 stackp-flag := -fstack-protector 670 stackp-name := REGULAR 671else 672ifdef CONFIG_CC_STACKPROTECTOR_STRONG 673 stackp-flag := -fstack-protector-strong 674 stackp-name := STRONG 675else 676 # Force off for distro compilers that enable stack protector by default. 677 stackp-flag := $(call cc-option, -fno-stack-protector) 678endif 679endif 680# Find arch-specific stack protector compiler sanity-checking script. 681ifdef CONFIG_CC_STACKPROTECTOR 682 stackp-path := $(srctree)/scripts/gcc-$(SRCARCH)_$(BITS)-has-stack-protector.sh 683 stackp-check := $(wildcard $(stackp-path)) 684endif 685KBUILD_CFLAGS += $(stackp-flag) 686 687ifeq ($(cc-name),clang) 688ifneq ($(CROSS_COMPILE),) 689CLANG_TARGET := --target=$(notdir $(CROSS_COMPILE:%-=%)) 690GCC_TOOLCHAIN := $(realpath $(dir $(shell which $(LD)))/..) 691endif 692ifneq ($(GCC_TOOLCHAIN),) 693CLANG_GCC_TC := --gcc-toolchain=$(GCC_TOOLCHAIN) 694endif 695KBUILD_CFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC) 696KBUILD_AFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC) 697KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,) 698KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable) 699KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier) 700KBUILD_CFLAGS += $(call cc-disable-warning, gnu) 701KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) 702# Quiet clang warning: comparison of unsigned expression < 0 is always false 703KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare) 704# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the 705# source of a reference will be _MergedGlobals and not on of the whitelisted names. 706# See modpost pattern 2 707KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,) 708KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior) 709KBUILD_CFLAGS += $(call cc-option, -no-integrated-as) 710KBUILD_AFLAGS += $(call cc-option, -no-integrated-as) 711else 712 713# These warnings generated too much noise in a regular build. 714# Use make W=1 to enable them (see scripts/Makefile.extrawarn) 715KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable) 716KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) 717endif 718 719ifdef CONFIG_FRAME_POINTER 720KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 721else 722# Some targets (ARM with Thumb2, for example), can't be built with frame 723# pointers. For those, we don't have FUNCTION_TRACER automatically 724# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 725# incompatible with -fomit-frame-pointer with current GCC, so we don't use 726# -fomit-frame-pointer with FUNCTION_TRACER. 727ifndef CONFIG_FUNCTION_TRACER 728KBUILD_CFLAGS += -fomit-frame-pointer 729endif 730endif 731 732KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments) 733 734ifdef CONFIG_DEBUG_INFO 735ifdef CONFIG_DEBUG_INFO_SPLIT 736KBUILD_CFLAGS += $(call cc-option, -gsplit-dwarf, -g) 737else 738KBUILD_CFLAGS += -g 739endif 740KBUILD_AFLAGS += -Wa,-gdwarf-2 741endif 742ifdef CONFIG_DEBUG_INFO_DWARF4 743KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,) 744endif 745 746ifdef CONFIG_DEBUG_INFO_REDUCED 747KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \ 748 $(call cc-option,-fno-var-tracking) 749endif 750 751ifdef CONFIG_FUNCTION_TRACER 752ifndef CC_FLAGS_FTRACE 753CC_FLAGS_FTRACE := -pg 754endif 755export CC_FLAGS_FTRACE 756ifdef CONFIG_HAVE_FENTRY 757CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY) 758endif 759KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY) 760KBUILD_AFLAGS += $(CC_USING_FENTRY) 761ifdef CONFIG_DYNAMIC_FTRACE 762 ifdef CONFIG_HAVE_C_RECORDMCOUNT 763 BUILD_C_RECORDMCOUNT := y 764 export BUILD_C_RECORDMCOUNT 765 endif 766endif 767endif 768 769# We trigger additional mismatches with less inlining 770ifdef CONFIG_DEBUG_SECTION_MISMATCH 771KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) 772endif 773 774ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 775KBUILD_CFLAGS += $(call cc-option,-ffunction-sections,) 776KBUILD_CFLAGS += $(call cc-option,-fdata-sections,) 777endif 778 779# arch Makefile may override CC so keep this after arch Makefile is included 780NOSTDINC_FLAGS += -nostdinc -isystem $(call shell-cached,$(CC) -print-file-name=include) 781CHECKFLAGS += $(NOSTDINC_FLAGS) 782 783# warn about C99 declaration after statement 784KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,) 785 786# disable pointer signed / unsigned warnings in gcc 4.0 787KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign) 788 789# disable invalid "can't wrap" optimizations for signed / pointers 790KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow) 791 792# conserve stack if available 793KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) 794 795# disallow errors like 'EXPORT_GPL(foo);' with missing header 796KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int) 797 798# require functions to have arguments in prototypes, not empty 'int foo()' 799KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes) 800 801# Prohibit date/time macros, which would make the build non-deterministic 802KBUILD_CFLAGS += $(call cc-option,-Werror=date-time) 803 804# enforce correct pointer usage 805KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 806 807# Require designated initializers for all marked structures 808KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) 809 810# use the deterministic mode of AR if available 811KBUILD_ARFLAGS := $(call ar-option,D) 812 813include scripts/Makefile.kasan 814include scripts/Makefile.extrawarn 815include scripts/Makefile.ubsan 816 817# Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the 818# last assignments 819KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS) 820KBUILD_AFLAGS += $(ARCH_AFLAGS) $(KAFLAGS) 821KBUILD_CFLAGS += $(ARCH_CFLAGS) $(KCFLAGS) 822 823# Use --build-id when available. 824LDFLAGS_BUILD_ID := $(patsubst -Wl$(comma)%,%,\ 825 $(call cc-ldoption, -Wl$(comma)--build-id,)) 826KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID) 827LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID) 828 829ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 830LDFLAGS_vmlinux += $(call ld-option, --gc-sections,) 831endif 832 833ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 834LDFLAGS_vmlinux += $(call ld-option, -X,) 835endif 836 837# Default kernel image to build when no specific target is given. 838# KBUILD_IMAGE may be overruled on the command line or 839# set in the environment 840# Also any assignments in arch/$(ARCH)/Makefile take precedence over 841# this default value 842export KBUILD_IMAGE ?= vmlinux 843 844# 845# INSTALL_PATH specifies where to place the updated kernel and system map 846# images. Default is /boot, but you can set it to other values 847export INSTALL_PATH ?= /boot 848 849# 850# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 851# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 852# an argument if needed. Otherwise it defaults to the kernel install path 853# 854export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 855 856# 857# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 858# relocations required by build roots. This is not defined in the 859# makefile but the argument can be passed to make if needed. 860# 861 862MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 863export MODLIB 864 865# 866# INSTALL_MOD_STRIP, if defined, will cause modules to be 867# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then 868# the default option --strip-debug will be used. Otherwise, 869# INSTALL_MOD_STRIP value will be used as the options to the strip command. 870 871ifdef INSTALL_MOD_STRIP 872ifeq ($(INSTALL_MOD_STRIP),1) 873mod_strip_cmd = $(STRIP) --strip-debug 874else 875mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP) 876endif # INSTALL_MOD_STRIP=1 877else 878mod_strip_cmd = true 879endif # INSTALL_MOD_STRIP 880export mod_strip_cmd 881 882# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed 883# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP 884# or CONFIG_MODULE_COMPRESS_XZ. 885 886mod_compress_cmd = true 887ifdef CONFIG_MODULE_COMPRESS 888 ifdef CONFIG_MODULE_COMPRESS_GZIP 889 mod_compress_cmd = gzip -n -f 890 endif # CONFIG_MODULE_COMPRESS_GZIP 891 ifdef CONFIG_MODULE_COMPRESS_XZ 892 mod_compress_cmd = xz -f 893 endif # CONFIG_MODULE_COMPRESS_XZ 894endif # CONFIG_MODULE_COMPRESS 895export mod_compress_cmd 896 897# Select initial ramdisk compression format, default is gzip(1). 898# This shall be used by the dracut(8) tool while creating an initramfs image. 899# 900INITRD_COMPRESS-y := gzip 901INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2 902INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma 903INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz 904INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo 905INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4 906# do not export INITRD_COMPRESS, since we didn't actually 907# choose a sane default compression above. 908# export INITRD_COMPRESS := $(INITRD_COMPRESS-y) 909 910ifdef CONFIG_MODULE_SIG_ALL 911$(eval $(call config_filename,MODULE_SIG_KEY)) 912 913mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509 914else 915mod_sign_cmd = true 916endif 917export mod_sign_cmd 918 919ifdef CONFIG_STACK_VALIDATION 920 has_libelf := $(call try-run,\ 921 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0) 922 ifeq ($(has_libelf),1) 923 objtool_target := tools/objtool FORCE 924 else 925 ifdef CONFIG_UNWINDER_ORC 926 $(error "Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel") 927 else 928 $(warning "Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel") 929 endif 930 SKIP_STACK_VALIDATION := 1 931 export SKIP_STACK_VALIDATION 932 endif 933endif 934 935 936ifeq ($(KBUILD_EXTMOD),) 937core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/ 938 939vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \ 940 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 941 $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y))) 942 943vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \ 944 $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-)))) 945 946init-y := $(patsubst %/, %/built-in.o, $(init-y)) 947core-y := $(patsubst %/, %/built-in.o, $(core-y)) 948drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y)) 949net-y := $(patsubst %/, %/built-in.o, $(net-y)) 950libs-y1 := $(patsubst %/, %/lib.a, $(libs-y)) 951libs-y2 := $(filter-out %.a, $(patsubst %/, %/built-in.o, $(libs-y))) 952virt-y := $(patsubst %/, %/built-in.o, $(virt-y)) 953 954# Externally visible symbols (used by link-vmlinux.sh) 955export KBUILD_VMLINUX_INIT := $(head-y) $(init-y) 956export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y2) $(drivers-y) $(net-y) $(virt-y) 957export KBUILD_VMLINUX_LIBS := $(libs-y1) 958export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 959export LDFLAGS_vmlinux 960# used by scripts/package/Makefile 961export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools) 962 963vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) $(KBUILD_VMLINUX_LIBS) 964 965# Include targets which we want to execute sequentially if the rest of the 966# kernel build went well. If CONFIG_TRIM_UNUSED_KSYMS is set, this might be 967# evaluated more than once. 968PHONY += vmlinux_prereq 969vmlinux_prereq: $(vmlinux-deps) FORCE 970ifdef CONFIG_HEADERS_CHECK 971 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check 972endif 973ifdef CONFIG_GDB_SCRIPTS 974 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 975endif 976ifdef CONFIG_TRIM_UNUSED_KSYMS 977 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ 978 "$(MAKE) -f $(srctree)/Makefile vmlinux" 979endif 980 981# standalone target for easier testing 982include/generated/autoksyms.h: FORCE 983 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh true 984 985ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink) 986 987# Final link of vmlinux with optional arch pass after final link 988cmd_link-vmlinux = \ 989 $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) ; \ 990 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) 991 992vmlinux: scripts/link-vmlinux.sh vmlinux_prereq $(vmlinux-deps) FORCE 993 +$(call if_changed,link-vmlinux) 994 995# Build samples along the rest of the kernel 996ifdef CONFIG_SAMPLES 997vmlinux-dirs += samples 998endif 999 1000# The actual objects are generated when descending, 1001# make sure no implicit rule kicks in 1002$(sort $(vmlinux-deps)): $(vmlinux-dirs) ; 1003 1004# Handle descending into subdirectories listed in $(vmlinux-dirs) 1005# Preset locale variables to speed up the build process. Limit locale 1006# tweaks to this spot to avoid wrong language settings when running 1007# make menuconfig etc. 1008# Error messages still appears in the original language 1009 1010PHONY += $(vmlinux-dirs) 1011$(vmlinux-dirs): prepare scripts 1012 $(Q)$(MAKE) $(build)=$@ need-builtin=1 1013 1014define filechk_kernel.release 1015 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1016endef 1017 1018# Store (new) KERNELRELEASE string in include/config/kernel.release 1019include/config/kernel.release: include/config/auto.conf FORCE 1020 $(call filechk,kernel.release) 1021 1022 1023# Things we need to do before we recursively start building the kernel 1024# or the modules are listed in "prepare". 1025# A multi level approach is used. prepareN is processed before prepareN-1. 1026# archprepare is used in arch Makefiles and when processed asm symlink, 1027# version.h and scripts_basic is processed / created. 1028 1029# Listed in dependency order 1030PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3 1031 1032# prepare3 is used to check if we are building in a separate output directory, 1033# and if so do: 1034# 1) Check that make has not been executed in the kernel src $(srctree) 1035prepare3: include/config/kernel.release 1036ifneq ($(KBUILD_SRC),) 1037 @$(kecho) ' Using $(srctree) as source for kernel' 1038 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \ 1039 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \ 1040 echo >&2 " in the '$(srctree)' directory.";\ 1041 /bin/false; \ 1042 fi; 1043endif 1044 1045# prepare2 creates a makefile if using a separate output directory. 1046# From this point forward, .config has been reprocessed, so any rules 1047# that need to depend on updated CONFIG_* values can be checked here. 1048prepare2: prepare3 prepare-compiler-check outputmakefile asm-generic 1049 1050prepare1: prepare2 $(version_h) include/generated/utsrelease.h \ 1051 include/config/auto.conf 1052 $(cmd_crmodverdir) 1053 1054archprepare: archheaders archscripts prepare1 scripts_basic 1055 1056prepare0: archprepare gcc-plugins 1057 $(Q)$(MAKE) $(build)=. 1058 1059# All the preparing.. 1060prepare: prepare0 prepare-objtool 1061 1062# Support for using generic headers in asm-generic 1063PHONY += asm-generic uapi-asm-generic 1064asm-generic: uapi-asm-generic 1065 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \ 1066 src=asm obj=arch/$(SRCARCH)/include/generated/asm 1067uapi-asm-generic: 1068 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \ 1069 src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm 1070 1071PHONY += prepare-objtool 1072prepare-objtool: $(objtool_target) 1073 1074# Check for CONFIG flags that require compiler support. Abort the build 1075# after .config has been processed, but before the kernel build starts. 1076# 1077# For security-sensitive CONFIG options, we don't want to fallback and/or 1078# silently change which compiler flags will be used, since that leads to 1079# producing kernels with different security feature characteristics 1080# depending on the compiler used. (For example, "But I selected 1081# CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!") 1082PHONY += prepare-compiler-check 1083prepare-compiler-check: FORCE 1084# Make sure compiler supports requested stack protector flag. 1085ifdef stackp-name 1086 ifeq ($(call cc-option, $(stackp-flag)),) 1087 @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \ 1088 $(stackp-flag) not supported by compiler >&2 && exit 1 1089 endif 1090endif 1091# Make sure compiler does not have buggy stack-protector support. 1092ifdef stackp-check 1093 ifneq ($(shell $(CONFIG_SHELL) $(stackp-check) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y) 1094 @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \ 1095 $(stackp-flag) available but compiler is broken >&2 && exit 1 1096 endif 1097endif 1098 @: 1099 1100# Generate some files 1101# --------------------------------------------------------------------------- 1102 1103# KERNELRELEASE can change from a few different places, meaning version.h 1104# needs to be updated, so this check is forced on all builds 1105 1106uts_len := 64 1107define filechk_utsrelease.h 1108 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1109 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1110 exit 1; \ 1111 fi; \ 1112 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";) 1113endef 1114 1115define filechk_version.h 1116 (echo \#define LINUX_VERSION_CODE $(shell \ 1117 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \ 1118 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';) 1119endef 1120 1121$(version_h): $(srctree)/Makefile FORCE 1122 $(call filechk,version.h) 1123 $(Q)rm -f $(old_version_h) 1124 1125include/generated/utsrelease.h: include/config/kernel.release FORCE 1126 $(call filechk,utsrelease.h) 1127 1128PHONY += headerdep 1129headerdep: 1130 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1131 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1132 1133# --------------------------------------------------------------------------- 1134# Kernel headers 1135 1136#Default location for installed headers 1137export INSTALL_HDR_PATH = $(objtree)/usr 1138 1139# If we do an all arch process set dst to include/arch-$(SRCARCH) 1140hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(SRCARCH), dst=include) 1141 1142PHONY += archheaders 1143archheaders: 1144 1145PHONY += archscripts 1146archscripts: 1147 1148PHONY += __headers 1149__headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts 1150 $(Q)$(MAKE) $(build)=scripts build_unifdef 1151 1152PHONY += headers_install_all 1153headers_install_all: 1154 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install 1155 1156PHONY += headers_install 1157headers_install: __headers 1158 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \ 1159 $(error Headers not exportable for the $(SRCARCH) architecture)) 1160 $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include 1161 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) 1162 1163PHONY += headers_check_all 1164headers_check_all: headers_install_all 1165 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check 1166 1167PHONY += headers_check 1168headers_check: headers_install 1169 $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1 1170 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) HDRCHECK=1 1171 1172# --------------------------------------------------------------------------- 1173# Kernel selftest 1174 1175PHONY += kselftest 1176kselftest: 1177 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1178 1179PHONY += kselftest-clean 1180kselftest-clean: 1181 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean 1182 1183PHONY += kselftest-merge 1184kselftest-merge: 1185 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1186 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \ 1187 -m $(objtree)/.config \ 1188 $(srctree)/tools/testing/selftests/*/config 1189 +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1190 1191# --------------------------------------------------------------------------- 1192# Modules 1193 1194ifdef CONFIG_MODULES 1195 1196# By default, build modules as well 1197 1198all: modules 1199 1200# Build modules 1201# 1202# A module can be listed more than once in obj-m resulting in 1203# duplicate lines in modules.order files. Those are removed 1204# using awk while concatenating to the final file. 1205 1206PHONY += modules 1207modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin 1208 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order 1209 @$(kecho) ' Building modules, stage 2.'; 1210 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1211 1212modules.builtin: $(vmlinux-dirs:%=%/modules.builtin) 1213 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin 1214 1215%/modules.builtin: include/config/auto.conf 1216 $(Q)$(MAKE) $(modbuiltin)=$* 1217 1218 1219# Target to prepare building external modules 1220PHONY += modules_prepare 1221modules_prepare: prepare scripts 1222 1223# Target to install modules 1224PHONY += modules_install 1225modules_install: _modinst_ _modinst_post 1226 1227PHONY += _modinst_ 1228_modinst_: 1229 @rm -rf $(MODLIB)/kernel 1230 @rm -f $(MODLIB)/source 1231 @mkdir -p $(MODLIB)/kernel 1232 @ln -s $(abspath $(srctree)) $(MODLIB)/source 1233 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1234 rm -f $(MODLIB)/build ; \ 1235 ln -s $(CURDIR) $(MODLIB)/build ; \ 1236 fi 1237 @cp -f $(objtree)/modules.order $(MODLIB)/ 1238 @cp -f $(objtree)/modules.builtin $(MODLIB)/ 1239 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1240 1241# This depmod is only for convenience to give the initial 1242# boot a modules.dep even before / is mounted read-write. However the 1243# boot script depmod is the master version. 1244PHONY += _modinst_post 1245_modinst_post: _modinst_ 1246 $(call cmd,depmod) 1247 1248ifeq ($(CONFIG_MODULE_SIG), y) 1249PHONY += modules_sign 1250modules_sign: 1251 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign 1252endif 1253 1254else # CONFIG_MODULES 1255 1256# Modules not configured 1257# --------------------------------------------------------------------------- 1258 1259PHONY += modules modules_install 1260modules modules_install: 1261 @echo >&2 1262 @echo >&2 "The present kernel configuration has modules disabled." 1263 @echo >&2 "Type 'make config' and enable loadable module support." 1264 @echo >&2 "Then build a kernel with module support enabled." 1265 @echo >&2 1266 @exit 1 1267 1268endif # CONFIG_MODULES 1269 1270### 1271# Cleaning is done on three levels. 1272# make clean Delete most generated files 1273# Leave enough to build external modules 1274# make mrproper Delete the current configuration, and all generated files 1275# make distclean Remove editor backup files, patch leftover files and the like 1276 1277# Directories & files removed with 'make clean' 1278CLEAN_DIRS += $(MODVERDIR) 1279 1280# Directories & files removed with 'make mrproper' 1281MRPROPER_DIRS += include/config usr/include include/generated \ 1282 arch/*/include/generated .tmp_objdiff 1283MRPROPER_FILES += .config .config.old .version \ 1284 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \ 1285 signing_key.pem signing_key.priv signing_key.x509 \ 1286 x509.genkey extra_certificates signing_key.x509.keyid \ 1287 signing_key.x509.signer vmlinux-gdb.py 1288 1289# clean - Delete most, but leave enough to build external modules 1290# 1291clean: rm-dirs := $(CLEAN_DIRS) 1292clean: rm-files := $(CLEAN_FILES) 1293clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples) 1294 1295PHONY += $(clean-dirs) clean archclean vmlinuxclean 1296$(clean-dirs): 1297 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1298 1299vmlinuxclean: 1300 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1301 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1302 1303clean: archclean vmlinuxclean 1304 1305# mrproper - Delete all generated files, including .config 1306# 1307mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS)) 1308mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1309mrproper-dirs := $(addprefix _mrproper_,scripts) 1310 1311PHONY += $(mrproper-dirs) mrproper archmrproper 1312$(mrproper-dirs): 1313 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1314 1315mrproper: clean archmrproper $(mrproper-dirs) 1316 $(call cmd,rmdirs) 1317 $(call cmd,rmfiles) 1318 1319# distclean 1320# 1321PHONY += distclean 1322 1323distclean: mrproper 1324 @find $(srctree) $(RCS_FIND_IGNORE) \ 1325 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1326 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1327 -o -name 'core' \) \ 1328 -type f -print | xargs rm -f 1329 1330 1331# Packaging of the kernel to various formats 1332# --------------------------------------------------------------------------- 1333# rpm target kept for backward compatibility 1334package-dir := scripts/package 1335 1336%src-pkg: FORCE 1337 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1338%pkg: include/config/kernel.release FORCE 1339 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1340rpm: include/config/kernel.release FORCE 1341 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1342 1343 1344# Brief documentation of the typical targets used 1345# --------------------------------------------------------------------------- 1346 1347boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1348boards := $(sort $(notdir $(boards))) 1349board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1350board-dirs := $(sort $(notdir $(board-dirs:/=))) 1351 1352PHONY += help 1353help: 1354 @echo 'Cleaning targets:' 1355 @echo ' clean - Remove most generated files but keep the config and' 1356 @echo ' enough build support to build external modules' 1357 @echo ' mrproper - Remove all generated files + config + various backup files' 1358 @echo ' distclean - mrproper + remove editor backup and patch files' 1359 @echo '' 1360 @echo 'Configuration targets:' 1361 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1362 @echo '' 1363 @echo 'Other generic targets:' 1364 @echo ' all - Build all targets marked with [*]' 1365 @echo '* vmlinux - Build the bare kernel' 1366 @echo '* modules - Build all modules' 1367 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1368 @echo ' dir/ - Build all files in dir and below' 1369 @echo ' dir/file.[ois] - Build specified target only' 1370 @echo ' dir/file.ll - Build the LLVM assembly file' 1371 @echo ' (requires compiler support for LLVM assembly generation)' 1372 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1373 @echo ' (requires a recent binutils and recent build (System.map))' 1374 @echo ' dir/file.ko - Build module including final link' 1375 @echo ' modules_prepare - Set up for building external modules' 1376 @echo ' tags/TAGS - Generate tags file for editors' 1377 @echo ' cscope - Generate cscope index' 1378 @echo ' gtags - Generate GNU GLOBAL index' 1379 @echo ' kernelrelease - Output the release version string (use with make -s)' 1380 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1381 @echo ' image_name - Output the image name (use with make -s)' 1382 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1383 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1384 echo '' 1385 @echo 'Static analysers:' 1386 @echo ' checkstack - Generate a list of stack hogs' 1387 @echo ' namespacecheck - Name space analysis on compiled kernel' 1388 @echo ' versioncheck - Sanity check on version.h usage' 1389 @echo ' includecheck - Check for duplicate included header files' 1390 @echo ' export_report - List the usages of all exported symbols' 1391 @echo ' headers_check - Sanity check on exported headers' 1392 @echo ' headerdep - Detect inclusion cycles in headers' 1393 @echo ' coccicheck - Check with Coccinelle' 1394 @echo '' 1395 @echo 'Kernel selftest:' 1396 @echo ' kselftest - Build and run kernel selftest (run as root)' 1397 @echo ' Build, install, and boot kernel before' 1398 @echo ' running kselftest on it' 1399 @echo ' kselftest-clean - Remove all generated kselftest files' 1400 @echo ' kselftest-merge - Merge all the config dependencies of kselftest to existing' 1401 @echo ' .config.' 1402 @echo '' 1403 @echo 'Userspace tools targets:' 1404 @echo ' use "make tools/help"' 1405 @echo ' or "cd tools; make help"' 1406 @echo '' 1407 @echo 'Kernel packaging:' 1408 @$(MAKE) $(build)=$(package-dir) help 1409 @echo '' 1410 @echo 'Documentation targets:' 1411 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1412 @echo '' 1413 @echo 'Architecture specific targets ($(SRCARCH)):' 1414 @$(if $(archhelp),$(archhelp),\ 1415 echo ' No architecture specific help defined for $(SRCARCH)') 1416 @echo '' 1417 @$(if $(boards), \ 1418 $(foreach b, $(boards), \ 1419 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1420 echo '') 1421 @$(if $(board-dirs), \ 1422 $(foreach b, $(board-dirs), \ 1423 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1424 printf " %-16s - Show all of the above\\n" help-boards; \ 1425 echo '') 1426 1427 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1428 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1429 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1430 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK (sparse by default)' 1431 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1432 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1433 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where' 1434 @echo ' 1: warnings which may be relevant and do not occur too often' 1435 @echo ' 2: warnings which occur quite often but may still be relevant' 1436 @echo ' 3: more obscure warnings, can most likely be ignored' 1437 @echo ' Multiple levels can be combined with W=12 or W=123' 1438 @echo '' 1439 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1440 @echo 'For further info see the ./README file' 1441 1442 1443help-board-dirs := $(addprefix help-,$(board-dirs)) 1444 1445help-boards: $(help-board-dirs) 1446 1447boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1448 1449$(help-board-dirs): help-%: 1450 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1451 @$(if $(boards-per-dir), \ 1452 $(foreach b, $(boards-per-dir), \ 1453 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1454 echo '') 1455 1456 1457# Documentation targets 1458# --------------------------------------------------------------------------- 1459DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1460 linkcheckdocs dochelp refcheckdocs 1461PHONY += $(DOC_TARGETS) 1462$(DOC_TARGETS): scripts_basic FORCE 1463 $(Q)$(MAKE) $(build)=Documentation $@ 1464 1465else # KBUILD_EXTMOD 1466 1467### 1468# External module support. 1469# When building external modules the kernel used as basis is considered 1470# read-only, and no consistency checks are made and the make 1471# system is not used on the basis kernel. If updates are required 1472# in the basis kernel ordinary make commands (without M=...) must 1473# be used. 1474# 1475# The following are the only valid targets when building external 1476# modules. 1477# make M=dir clean Delete all automatically generated files 1478# make M=dir modules Make all modules in specified dir 1479# make M=dir Same as 'make M=dir modules' 1480# make M=dir modules_install 1481# Install the modules built in the module directory 1482# Assumes install directory is already created 1483 1484# We are always building modules 1485KBUILD_MODULES := 1 1486PHONY += crmodverdir 1487crmodverdir: 1488 $(cmd_crmodverdir) 1489 1490PHONY += $(objtree)/Module.symvers 1491$(objtree)/Module.symvers: 1492 @test -e $(objtree)/Module.symvers || ( \ 1493 echo; \ 1494 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \ 1495 echo " is missing; modules will have no dependencies and modversions."; \ 1496 echo ) 1497 1498module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD)) 1499PHONY += $(module-dirs) modules 1500$(module-dirs): crmodverdir $(objtree)/Module.symvers 1501 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@) 1502 1503modules: $(module-dirs) 1504 @$(kecho) ' Building modules, stage 2.'; 1505 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1506 1507PHONY += modules_install 1508modules_install: _emodinst_ _emodinst_post 1509 1510install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra) 1511PHONY += _emodinst_ 1512_emodinst_: 1513 $(Q)mkdir -p $(MODLIB)/$(install-dir) 1514 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1515 1516PHONY += _emodinst_post 1517_emodinst_post: _emodinst_ 1518 $(call cmd,depmod) 1519 1520clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD)) 1521 1522PHONY += $(clean-dirs) clean 1523$(clean-dirs): 1524 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1525 1526clean: rm-dirs := $(MODVERDIR) 1527clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers 1528 1529PHONY += help 1530help: 1531 @echo ' Building external modules.' 1532 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1533 @echo '' 1534 @echo ' modules - default target, build the module(s)' 1535 @echo ' modules_install - install the module' 1536 @echo ' clean - remove generated files in module directory only' 1537 @echo '' 1538 1539# Dummies... 1540PHONY += prepare scripts 1541prepare: ; 1542scripts: ; 1543endif # KBUILD_EXTMOD 1544 1545clean: $(clean-dirs) 1546 $(call cmd,rmdirs) 1547 $(call cmd,rmfiles) 1548 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1549 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \ 1550 -o -name '*.ko.*' -o -name '*.dtb' -o -name '*.dtb.S' \ 1551 -o -name '*.dwo' \ 1552 -o -name '*.su' \ 1553 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1554 -o -name '*.symtypes' -o -name 'modules.order' \ 1555 -o -name modules.builtin -o -name '.tmp_*.o.*' \ 1556 -o -name .cache.mk \ 1557 -o -name '*.c.[012]*.*' \ 1558 -o -name '*.ll' \ 1559 -o -name '*.gcno' \) -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 $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))" 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