1# SPDX-License-Identifier: GPL-2.0 2VERSION = 4 3PATCHLEVEL = 15 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 380LEX = flex 381YACC = bison 382AWK = awk 383GENKSYMS = scripts/genksyms/genksyms 384INSTALLKERNEL := installkernel 385DEPMOD = /sbin/depmod 386PERL = perl 387PYTHON = python 388CHECK = sparse 389 390CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 391 -Wbitwise -Wno-return-void $(CF) 392NOSTDINC_FLAGS = 393CFLAGS_MODULE = 394AFLAGS_MODULE = 395LDFLAGS_MODULE = 396CFLAGS_KERNEL = 397AFLAGS_KERNEL = 398LDFLAGS_vmlinux = 399 400# Use USERINCLUDE when you must reference the UAPI directories only. 401USERINCLUDE := \ 402 -I$(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 429GCC_PLUGINS_CFLAGS := 430 431export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC 432export CPP AR NM STRIP OBJCOPY OBJDUMP HOSTLDFLAGS HOST_LOADLIBES 433export MAKE LEX YACC AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE 434export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS 435 436export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS 437export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_KASAN CFLAGS_UBSAN 438export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 439export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 440export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 441export KBUILD_ARFLAGS 442 443# When compiling out-of-tree modules, put MODVERDIR in the module 444# tree rather than in the kernel tree. The kernel tree might 445# even be read-only. 446export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions 447 448# Files to ignore in find ... statements 449 450export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 451 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 452 -prune -o 453export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 454 --exclude CVS --exclude .pc --exclude .hg --exclude .git 455 456# =========================================================================== 457# Rules shared between *config targets and build targets 458 459# Basic helpers built in scripts/basic/ 460PHONY += scripts_basic 461scripts_basic: 462 $(Q)$(MAKE) $(build)=scripts/basic 463 $(Q)rm -f .tmp_quiet_recordmcount 464 465# To avoid any implicit rule to kick in, define an empty command. 466scripts/basic/%: scripts_basic ; 467 468PHONY += outputmakefile 469# outputmakefile generates a Makefile in the output directory, if using a 470# separate output directory. This allows convenient use of make in the 471# output directory. 472outputmakefile: 473ifneq ($(KBUILD_SRC),) 474 $(Q)ln -fsn $(srctree) source 475 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \ 476 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL) 477endif 478 479ifeq ($(cc-name),clang) 480ifneq ($(CROSS_COMPILE),) 481CLANG_TARGET := --target=$(notdir $(CROSS_COMPILE:%-=%)) 482GCC_TOOLCHAIN := $(realpath $(dir $(shell which $(LD)))/..) 483endif 484ifneq ($(GCC_TOOLCHAIN),) 485CLANG_GCC_TC := --gcc-toolchain=$(GCC_TOOLCHAIN) 486endif 487KBUILD_CFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC) 488KBUILD_AFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC) 489endif 490 491ifeq ($(config-targets),1) 492# =========================================================================== 493# *config targets only - make sure prerequisites are updated, and descend 494# in scripts/kconfig to make the *config target 495 496# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 497# KBUILD_DEFCONFIG may point out an alternative default configuration 498# used for 'make defconfig' 499include arch/$(SRCARCH)/Makefile 500export KBUILD_DEFCONFIG KBUILD_KCONFIG 501 502config: scripts_basic outputmakefile FORCE 503 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 504 505%config: scripts_basic outputmakefile FORCE 506 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 507 508else 509# =========================================================================== 510# Build targets only - this includes vmlinux, arch specific targets, clean 511# targets and others. In general all targets except *config targets. 512 513# If building an external module we do not care about the all: rule 514# but instead _all depend on modules 515PHONY += all 516ifeq ($(KBUILD_EXTMOD),) 517_all: all 518else 519_all: modules 520endif 521 522# Decide whether to build built-in, modular, or both. 523# Normally, just do built-in. 524 525KBUILD_MODULES := 526KBUILD_BUILTIN := 1 527 528# If we have only "make modules", don't compile built-in objects. 529# When we're building modules with modversions, we need to consider 530# the built-in objects during the descend as well, in order to 531# make sure the checksums are up to date before we record them. 532 533ifeq ($(MAKECMDGOALS),modules) 534 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1) 535endif 536 537# If we have "make <whatever> modules", compile modules 538# in addition to whatever we do anyway. 539# Just "make" or "make all" shall build modules as well 540 541ifneq ($(filter all _all modules,$(MAKECMDGOALS)),) 542 KBUILD_MODULES := 1 543endif 544 545ifeq ($(MAKECMDGOALS),) 546 KBUILD_MODULES := 1 547endif 548 549export KBUILD_MODULES KBUILD_BUILTIN 550 551ifeq ($(KBUILD_EXTMOD),) 552# Additional helpers built in scripts/ 553# Carefully list dependencies so we do not try to build scripts twice 554# in parallel 555PHONY += scripts 556scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \ 557 asm-generic gcc-plugins 558 $(Q)$(MAKE) $(build)=$(@) 559 560# Objects we will link into vmlinux / subdirs we need to visit 561init-y := init/ 562drivers-y := drivers/ sound/ firmware/ 563net-y := net/ 564libs-y := lib/ 565core-y := usr/ 566virt-y := virt/ 567endif # KBUILD_EXTMOD 568 569ifeq ($(dot-config),1) 570# Read in config 571-include include/config/auto.conf 572 573ifeq ($(KBUILD_EXTMOD),) 574# Read in dependencies to all Kconfig* files, make sure to run 575# oldconfig if changes are detected. 576-include include/config/auto.conf.cmd 577 578# To avoid any implicit rule to kick in, define an empty command 579$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ; 580 581# If .config is newer than include/config/auto.conf, someone tinkered 582# with it and forgot to run make oldconfig. 583# if auto.conf.cmd is missing then we are probably in a cleaned tree so 584# we execute the config step to be sure to catch updated Kconfig files 585include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd 586 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig 587else 588# external modules needs include/generated/autoconf.h and include/config/auto.conf 589# but do not care if they are up-to-date. Use auto.conf to trigger the test 590PHONY += include/config/auto.conf 591 592include/config/auto.conf: 593 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 594 echo >&2; \ 595 echo >&2 " ERROR: Kernel configuration is invalid."; \ 596 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 597 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 598 echo >&2 ; \ 599 /bin/false) 600 601endif # KBUILD_EXTMOD 602 603else 604# Dummy target needed, because used as prerequisite 605include/config/auto.conf: ; 606endif # $(dot-config) 607 608# For the kernel to actually contain only the needed exported symbols, 609# we have to build modules as well to determine what those symbols are. 610# (this can be evaluated only once include/config/auto.conf has been included) 611ifdef CONFIG_TRIM_UNUSED_KSYMS 612 KBUILD_MODULES := 1 613endif 614 615# The all: target is the default when no target is given on the 616# command line. 617# This allow a user to issue only 'make' to build a kernel including modules 618# Defaults to vmlinux, but the arch makefile usually adds further targets 619all: vmlinux 620 621KBUILD_CFLAGS += $(call cc-option,-fno-PIE) 622KBUILD_AFLAGS += $(call cc-option,-fno-PIE) 623CFLAGS_GCOV := -fprofile-arcs -ftest-coverage -fno-tree-loop-im $(call cc-disable-warning,maybe-uninitialized,) 624export CFLAGS_GCOV CFLAGS_KCOV 625 626# The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default 627# values of the respective KBUILD_* variables 628ARCH_CPPFLAGS := 629ARCH_AFLAGS := 630ARCH_CFLAGS := 631include arch/$(SRCARCH)/Makefile 632 633KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,) 634KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) 635KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) 636KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) 637KBUILD_CFLAGS += $(call cc-disable-warning, int-in-bool-context) 638 639ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 640KBUILD_CFLAGS += $(call cc-option,-Oz,-Os) 641KBUILD_CFLAGS += $(call cc-disable-warning,maybe-uninitialized,) 642else 643ifdef CONFIG_PROFILE_ALL_BRANCHES 644KBUILD_CFLAGS += -O2 $(call cc-disable-warning,maybe-uninitialized,) 645else 646KBUILD_CFLAGS += -O2 647endif 648endif 649 650KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \ 651 $(call cc-disable-warning,maybe-uninitialized,)) 652 653# Tell gcc to never replace conditional load with a non-conditional one 654KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 655 656# check for 'asm goto' 657ifeq ($(call shell-cached,$(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y) 658 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO 659 KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO 660endif 661 662include scripts/Makefile.kcov 663include scripts/Makefile.gcc-plugins 664 665ifdef CONFIG_READABLE_ASM 666# Disable optimizations that make assembler listings hard to read. 667# reorder blocks reorders the control in the function 668# ipa clone creates specialized cloned functions 669# partial inlining inlines only parts of functions 670KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \ 671 $(call cc-option,-fno-ipa-cp-clone,) \ 672 $(call cc-option,-fno-partial-inlining) 673endif 674 675ifneq ($(CONFIG_FRAME_WARN),0) 676KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN}) 677endif 678 679# This selects the stack protector compiler flag. Testing it is delayed 680# until after .config has been reprocessed, in the prepare-compiler-check 681# target. 682ifdef CONFIG_CC_STACKPROTECTOR_REGULAR 683 stackp-flag := -fstack-protector 684 stackp-name := REGULAR 685else 686ifdef CONFIG_CC_STACKPROTECTOR_STRONG 687 stackp-flag := -fstack-protector-strong 688 stackp-name := STRONG 689else 690 # Force off for distro compilers that enable stack protector by default. 691 stackp-flag := $(call cc-option, -fno-stack-protector) 692endif 693endif 694# Find arch-specific stack protector compiler sanity-checking script. 695ifdef CONFIG_CC_STACKPROTECTOR 696 stackp-path := $(srctree)/scripts/gcc-$(SRCARCH)_$(BITS)-has-stack-protector.sh 697 stackp-check := $(wildcard $(stackp-path)) 698endif 699KBUILD_CFLAGS += $(stackp-flag) 700 701ifeq ($(cc-name),clang) 702KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,) 703KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier) 704KBUILD_CFLAGS += $(call cc-disable-warning, gnu) 705KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) 706# Quiet clang warning: comparison of unsigned expression < 0 is always false 707KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare) 708# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the 709# source of a reference will be _MergedGlobals and not on of the whitelisted names. 710# See modpost pattern 2 711KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,) 712KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior) 713KBUILD_CFLAGS += $(call cc-option, -no-integrated-as) 714KBUILD_AFLAGS += $(call cc-option, -no-integrated-as) 715else 716 717# These warnings generated too much noise in a regular build. 718# Use make W=1 to enable them (see scripts/Makefile.extrawarn) 719KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable) 720endif 721 722KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) 723ifdef CONFIG_FRAME_POINTER 724KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 725else 726# Some targets (ARM with Thumb2, for example), can't be built with frame 727# pointers. For those, we don't have FUNCTION_TRACER automatically 728# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 729# incompatible with -fomit-frame-pointer with current GCC, so we don't use 730# -fomit-frame-pointer with FUNCTION_TRACER. 731ifndef CONFIG_FUNCTION_TRACER 732KBUILD_CFLAGS += -fomit-frame-pointer 733endif 734endif 735 736KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments) 737 738ifdef CONFIG_DEBUG_INFO 739ifdef CONFIG_DEBUG_INFO_SPLIT 740KBUILD_CFLAGS += $(call cc-option, -gsplit-dwarf, -g) 741else 742KBUILD_CFLAGS += -g 743endif 744KBUILD_AFLAGS += -Wa,-gdwarf-2 745endif 746ifdef CONFIG_DEBUG_INFO_DWARF4 747KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,) 748endif 749 750ifdef CONFIG_DEBUG_INFO_REDUCED 751KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \ 752 $(call cc-option,-fno-var-tracking) 753endif 754 755ifdef CONFIG_FUNCTION_TRACER 756ifndef CC_FLAGS_FTRACE 757CC_FLAGS_FTRACE := -pg 758endif 759export CC_FLAGS_FTRACE 760ifdef CONFIG_HAVE_FENTRY 761CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY) 762endif 763KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY) 764KBUILD_AFLAGS += $(CC_USING_FENTRY) 765ifdef CONFIG_DYNAMIC_FTRACE 766 ifdef CONFIG_HAVE_C_RECORDMCOUNT 767 BUILD_C_RECORDMCOUNT := y 768 export BUILD_C_RECORDMCOUNT 769 endif 770endif 771endif 772 773# We trigger additional mismatches with less inlining 774ifdef CONFIG_DEBUG_SECTION_MISMATCH 775KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) 776endif 777 778ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 779KBUILD_CFLAGS += $(call cc-option,-ffunction-sections,) 780KBUILD_CFLAGS += $(call cc-option,-fdata-sections,) 781endif 782 783# arch Makefile may override CC so keep this after arch Makefile is included 784NOSTDINC_FLAGS += -nostdinc -isystem $(call shell-cached,$(CC) -print-file-name=include) 785CHECKFLAGS += $(NOSTDINC_FLAGS) 786 787# warn about C99 declaration after statement 788KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,) 789 790# disable pointer signed / unsigned warnings in gcc 4.0 791KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign) 792 793# disable invalid "can't wrap" optimizations for signed / pointers 794KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow) 795 796# Make sure -fstack-check isn't enabled (like gentoo apparently did) 797KBUILD_CFLAGS += $(call cc-option,-fno-stack-check,) 798 799# conserve stack if available 800KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) 801 802# disallow errors like 'EXPORT_GPL(foo);' with missing header 803KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int) 804 805# require functions to have arguments in prototypes, not empty 'int foo()' 806KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes) 807 808# Prohibit date/time macros, which would make the build non-deterministic 809KBUILD_CFLAGS += $(call cc-option,-Werror=date-time) 810 811# enforce correct pointer usage 812KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 813 814# Require designated initializers for all marked structures 815KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) 816 817# use the deterministic mode of AR if available 818KBUILD_ARFLAGS := $(call ar-option,D) 819 820include scripts/Makefile.kasan 821include scripts/Makefile.extrawarn 822include scripts/Makefile.ubsan 823 824# Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the 825# last assignments 826KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS) 827KBUILD_AFLAGS += $(ARCH_AFLAGS) $(KAFLAGS) 828KBUILD_CFLAGS += $(ARCH_CFLAGS) $(KCFLAGS) 829 830# Use --build-id when available. 831LDFLAGS_BUILD_ID := $(patsubst -Wl$(comma)%,%,\ 832 $(call cc-ldoption, -Wl$(comma)--build-id,)) 833KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID) 834LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID) 835 836ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 837LDFLAGS_vmlinux += $(call ld-option, --gc-sections,) 838endif 839 840ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 841LDFLAGS_vmlinux += $(call ld-option, -X,) 842endif 843 844# Default kernel image to build when no specific target is given. 845# KBUILD_IMAGE may be overruled on the command line or 846# set in the environment 847# Also any assignments in arch/$(ARCH)/Makefile take precedence over 848# this default value 849export KBUILD_IMAGE ?= vmlinux 850 851# 852# INSTALL_PATH specifies where to place the updated kernel and system map 853# images. Default is /boot, but you can set it to other values 854export INSTALL_PATH ?= /boot 855 856# 857# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 858# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 859# an argument if needed. Otherwise it defaults to the kernel install path 860# 861export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 862 863# 864# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 865# relocations required by build roots. This is not defined in the 866# makefile but the argument can be passed to make if needed. 867# 868 869MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 870export MODLIB 871 872# 873# INSTALL_MOD_STRIP, if defined, will cause modules to be 874# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then 875# the default option --strip-debug will be used. Otherwise, 876# INSTALL_MOD_STRIP value will be used as the options to the strip command. 877 878ifdef INSTALL_MOD_STRIP 879ifeq ($(INSTALL_MOD_STRIP),1) 880mod_strip_cmd = $(STRIP) --strip-debug 881else 882mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP) 883endif # INSTALL_MOD_STRIP=1 884else 885mod_strip_cmd = true 886endif # INSTALL_MOD_STRIP 887export mod_strip_cmd 888 889# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed 890# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP 891# or CONFIG_MODULE_COMPRESS_XZ. 892 893mod_compress_cmd = true 894ifdef CONFIG_MODULE_COMPRESS 895 ifdef CONFIG_MODULE_COMPRESS_GZIP 896 mod_compress_cmd = gzip -n -f 897 endif # CONFIG_MODULE_COMPRESS_GZIP 898 ifdef CONFIG_MODULE_COMPRESS_XZ 899 mod_compress_cmd = xz -f 900 endif # CONFIG_MODULE_COMPRESS_XZ 901endif # CONFIG_MODULE_COMPRESS 902export mod_compress_cmd 903 904# Select initial ramdisk compression format, default is gzip(1). 905# This shall be used by the dracut(8) tool while creating an initramfs image. 906# 907INITRD_COMPRESS-y := gzip 908INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2 909INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma 910INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz 911INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo 912INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4 913# do not export INITRD_COMPRESS, since we didn't actually 914# choose a sane default compression above. 915# export INITRD_COMPRESS := $(INITRD_COMPRESS-y) 916 917ifdef CONFIG_MODULE_SIG_ALL 918$(eval $(call config_filename,MODULE_SIG_KEY)) 919 920mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509 921else 922mod_sign_cmd = true 923endif 924export mod_sign_cmd 925 926ifdef CONFIG_STACK_VALIDATION 927 has_libelf := $(call try-run,\ 928 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0) 929 ifeq ($(has_libelf),1) 930 objtool_target := tools/objtool FORCE 931 else 932 ifdef CONFIG_UNWINDER_ORC 933 $(error "Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel") 934 else 935 $(warning "Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel") 936 endif 937 SKIP_STACK_VALIDATION := 1 938 export SKIP_STACK_VALIDATION 939 endif 940endif 941 942 943ifeq ($(KBUILD_EXTMOD),) 944core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/ 945 946vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \ 947 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 948 $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y))) 949 950vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \ 951 $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-)))) 952 953init-y := $(patsubst %/, %/built-in.o, $(init-y)) 954core-y := $(patsubst %/, %/built-in.o, $(core-y)) 955drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y)) 956net-y := $(patsubst %/, %/built-in.o, $(net-y)) 957libs-y1 := $(patsubst %/, %/lib.a, $(libs-y)) 958libs-y2 := $(filter-out %.a, $(patsubst %/, %/built-in.o, $(libs-y))) 959virt-y := $(patsubst %/, %/built-in.o, $(virt-y)) 960 961# Externally visible symbols (used by link-vmlinux.sh) 962export KBUILD_VMLINUX_INIT := $(head-y) $(init-y) 963export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y2) $(drivers-y) $(net-y) $(virt-y) 964export KBUILD_VMLINUX_LIBS := $(libs-y1) 965export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 966export LDFLAGS_vmlinux 967# used by scripts/package/Makefile 968export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools) 969 970vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) $(KBUILD_VMLINUX_LIBS) 971 972# Include targets which we want to execute sequentially if the rest of the 973# kernel build went well. If CONFIG_TRIM_UNUSED_KSYMS is set, this might be 974# evaluated more than once. 975PHONY += vmlinux_prereq 976vmlinux_prereq: $(vmlinux-deps) FORCE 977ifdef CONFIG_HEADERS_CHECK 978 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check 979endif 980ifdef CONFIG_GDB_SCRIPTS 981 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 982endif 983ifdef CONFIG_TRIM_UNUSED_KSYMS 984 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ 985 "$(MAKE) -f $(srctree)/Makefile vmlinux" 986endif 987 988# standalone target for easier testing 989include/generated/autoksyms.h: FORCE 990 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh true 991 992ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink) 993 994# Final link of vmlinux with optional arch pass after final link 995cmd_link-vmlinux = \ 996 $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) ; \ 997 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) 998 999vmlinux: scripts/link-vmlinux.sh vmlinux_prereq $(vmlinux-deps) FORCE 1000 +$(call if_changed,link-vmlinux) 1001 1002# Build samples along the rest of the kernel 1003ifdef CONFIG_SAMPLES 1004vmlinux-dirs += samples 1005endif 1006 1007# The actual objects are generated when descending, 1008# make sure no implicit rule kicks in 1009$(sort $(vmlinux-deps)): $(vmlinux-dirs) ; 1010 1011# Handle descending into subdirectories listed in $(vmlinux-dirs) 1012# Preset locale variables to speed up the build process. Limit locale 1013# tweaks to this spot to avoid wrong language settings when running 1014# make menuconfig etc. 1015# Error messages still appears in the original language 1016 1017PHONY += $(vmlinux-dirs) 1018$(vmlinux-dirs): prepare scripts 1019 $(Q)$(MAKE) $(build)=$@ need-builtin=1 1020 1021define filechk_kernel.release 1022 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1023endef 1024 1025# Store (new) KERNELRELEASE string in include/config/kernel.release 1026include/config/kernel.release: include/config/auto.conf FORCE 1027 $(call filechk,kernel.release) 1028 1029 1030# Things we need to do before we recursively start building the kernel 1031# or the modules are listed in "prepare". 1032# A multi level approach is used. prepareN is processed before prepareN-1. 1033# archprepare is used in arch Makefiles and when processed asm symlink, 1034# version.h and scripts_basic is processed / created. 1035 1036# Listed in dependency order 1037PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3 1038 1039# prepare3 is used to check if we are building in a separate output directory, 1040# and if so do: 1041# 1) Check that make has not been executed in the kernel src $(srctree) 1042prepare3: include/config/kernel.release 1043ifneq ($(KBUILD_SRC),) 1044 @$(kecho) ' Using $(srctree) as source for kernel' 1045 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \ 1046 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \ 1047 echo >&2 " in the '$(srctree)' directory.";\ 1048 /bin/false; \ 1049 fi; 1050endif 1051 1052# prepare2 creates a makefile if using a separate output directory. 1053# From this point forward, .config has been reprocessed, so any rules 1054# that need to depend on updated CONFIG_* values can be checked here. 1055prepare2: prepare3 prepare-compiler-check outputmakefile asm-generic 1056 1057prepare1: prepare2 $(version_h) include/generated/utsrelease.h \ 1058 include/config/auto.conf 1059 $(cmd_crmodverdir) 1060 1061archprepare: archheaders archscripts prepare1 scripts_basic 1062 1063prepare0: archprepare gcc-plugins 1064 $(Q)$(MAKE) $(build)=. 1065 1066# All the preparing.. 1067prepare: prepare0 prepare-objtool 1068 1069# Support for using generic headers in asm-generic 1070PHONY += asm-generic uapi-asm-generic 1071asm-generic: uapi-asm-generic 1072 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \ 1073 src=asm obj=arch/$(SRCARCH)/include/generated/asm 1074uapi-asm-generic: 1075 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \ 1076 src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm 1077 1078PHONY += prepare-objtool 1079prepare-objtool: $(objtool_target) 1080 1081# Check for CONFIG flags that require compiler support. Abort the build 1082# after .config has been processed, but before the kernel build starts. 1083# 1084# For security-sensitive CONFIG options, we don't want to fallback and/or 1085# silently change which compiler flags will be used, since that leads to 1086# producing kernels with different security feature characteristics 1087# depending on the compiler used. (For example, "But I selected 1088# CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!") 1089PHONY += prepare-compiler-check 1090prepare-compiler-check: FORCE 1091# Make sure compiler supports requested stack protector flag. 1092ifdef stackp-name 1093 ifeq ($(call cc-option, $(stackp-flag)),) 1094 @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \ 1095 $(stackp-flag) not supported by compiler >&2 && exit 1 1096 endif 1097endif 1098# Make sure compiler does not have buggy stack-protector support. 1099ifdef stackp-check 1100 ifneq ($(shell $(CONFIG_SHELL) $(stackp-check) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y) 1101 @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \ 1102 $(stackp-flag) available but compiler is broken >&2 && exit 1 1103 endif 1104endif 1105 @: 1106 1107# Generate some files 1108# --------------------------------------------------------------------------- 1109 1110# KERNELRELEASE can change from a few different places, meaning version.h 1111# needs to be updated, so this check is forced on all builds 1112 1113uts_len := 64 1114define filechk_utsrelease.h 1115 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1116 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1117 exit 1; \ 1118 fi; \ 1119 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";) 1120endef 1121 1122define filechk_version.h 1123 (echo \#define LINUX_VERSION_CODE $(shell \ 1124 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \ 1125 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';) 1126endef 1127 1128$(version_h): $(srctree)/Makefile FORCE 1129 $(call filechk,version.h) 1130 $(Q)rm -f $(old_version_h) 1131 1132include/generated/utsrelease.h: include/config/kernel.release FORCE 1133 $(call filechk,utsrelease.h) 1134 1135PHONY += headerdep 1136headerdep: 1137 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1138 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1139 1140# --------------------------------------------------------------------------- 1141# Kernel headers 1142 1143#Default location for installed headers 1144export INSTALL_HDR_PATH = $(objtree)/usr 1145 1146# If we do an all arch process set dst to include/arch-$(SRCARCH) 1147hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(SRCARCH), dst=include) 1148 1149PHONY += archheaders 1150archheaders: 1151 1152PHONY += archscripts 1153archscripts: 1154 1155PHONY += __headers 1156__headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts 1157 $(Q)$(MAKE) $(build)=scripts build_unifdef 1158 1159PHONY += headers_install_all 1160headers_install_all: 1161 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install 1162 1163PHONY += headers_install 1164headers_install: __headers 1165 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \ 1166 $(error Headers not exportable for the $(SRCARCH) architecture)) 1167 $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include 1168 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) 1169 1170PHONY += headers_check_all 1171headers_check_all: headers_install_all 1172 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check 1173 1174PHONY += headers_check 1175headers_check: headers_install 1176 $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1 1177 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) HDRCHECK=1 1178 1179# --------------------------------------------------------------------------- 1180# Kernel selftest 1181 1182PHONY += kselftest 1183kselftest: 1184 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1185 1186PHONY += kselftest-clean 1187kselftest-clean: 1188 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean 1189 1190PHONY += kselftest-merge 1191kselftest-merge: 1192 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1193 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \ 1194 -m $(objtree)/.config \ 1195 $(srctree)/tools/testing/selftests/*/config 1196 +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1197 1198# --------------------------------------------------------------------------- 1199# Modules 1200 1201ifdef CONFIG_MODULES 1202 1203# By default, build modules as well 1204 1205all: modules 1206 1207# Build modules 1208# 1209# A module can be listed more than once in obj-m resulting in 1210# duplicate lines in modules.order files. Those are removed 1211# using awk while concatenating to the final file. 1212 1213PHONY += modules 1214modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin 1215 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order 1216 @$(kecho) ' Building modules, stage 2.'; 1217 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1218 1219modules.builtin: $(vmlinux-dirs:%=%/modules.builtin) 1220 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin 1221 1222%/modules.builtin: include/config/auto.conf 1223 $(Q)$(MAKE) $(modbuiltin)=$* 1224 1225 1226# Target to prepare building external modules 1227PHONY += modules_prepare 1228modules_prepare: prepare scripts 1229 1230# Target to install modules 1231PHONY += modules_install 1232modules_install: _modinst_ _modinst_post 1233 1234PHONY += _modinst_ 1235_modinst_: 1236 @rm -rf $(MODLIB)/kernel 1237 @rm -f $(MODLIB)/source 1238 @mkdir -p $(MODLIB)/kernel 1239 @ln -s $(abspath $(srctree)) $(MODLIB)/source 1240 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1241 rm -f $(MODLIB)/build ; \ 1242 ln -s $(CURDIR) $(MODLIB)/build ; \ 1243 fi 1244 @cp -f $(objtree)/modules.order $(MODLIB)/ 1245 @cp -f $(objtree)/modules.builtin $(MODLIB)/ 1246 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1247 1248# This depmod is only for convenience to give the initial 1249# boot a modules.dep even before / is mounted read-write. However the 1250# boot script depmod is the master version. 1251PHONY += _modinst_post 1252_modinst_post: _modinst_ 1253 $(call cmd,depmod) 1254 1255ifeq ($(CONFIG_MODULE_SIG), y) 1256PHONY += modules_sign 1257modules_sign: 1258 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign 1259endif 1260 1261else # CONFIG_MODULES 1262 1263# Modules not configured 1264# --------------------------------------------------------------------------- 1265 1266PHONY += modules modules_install 1267modules modules_install: 1268 @echo >&2 1269 @echo >&2 "The present kernel configuration has modules disabled." 1270 @echo >&2 "Type 'make config' and enable loadable module support." 1271 @echo >&2 "Then build a kernel with module support enabled." 1272 @echo >&2 1273 @exit 1 1274 1275endif # CONFIG_MODULES 1276 1277### 1278# Cleaning is done on three levels. 1279# make clean Delete most generated files 1280# Leave enough to build external modules 1281# make mrproper Delete the current configuration, and all generated files 1282# make distclean Remove editor backup files, patch leftover files and the like 1283 1284# Directories & files removed with 'make clean' 1285CLEAN_DIRS += $(MODVERDIR) 1286 1287# Directories & files removed with 'make mrproper' 1288MRPROPER_DIRS += include/config usr/include include/generated \ 1289 arch/*/include/generated .tmp_objdiff 1290MRPROPER_FILES += .config .config.old .version \ 1291 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \ 1292 signing_key.pem signing_key.priv signing_key.x509 \ 1293 x509.genkey extra_certificates signing_key.x509.keyid \ 1294 signing_key.x509.signer vmlinux-gdb.py 1295 1296# clean - Delete most, but leave enough to build external modules 1297# 1298clean: rm-dirs := $(CLEAN_DIRS) 1299clean: rm-files := $(CLEAN_FILES) 1300clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples) 1301 1302PHONY += $(clean-dirs) clean archclean vmlinuxclean 1303$(clean-dirs): 1304 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1305 1306vmlinuxclean: 1307 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1308 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1309 1310clean: archclean vmlinuxclean 1311 1312# mrproper - Delete all generated files, including .config 1313# 1314mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS)) 1315mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1316mrproper-dirs := $(addprefix _mrproper_,scripts) 1317 1318PHONY += $(mrproper-dirs) mrproper archmrproper 1319$(mrproper-dirs): 1320 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1321 1322mrproper: clean archmrproper $(mrproper-dirs) 1323 $(call cmd,rmdirs) 1324 $(call cmd,rmfiles) 1325 1326# distclean 1327# 1328PHONY += distclean 1329 1330distclean: mrproper 1331 @find $(srctree) $(RCS_FIND_IGNORE) \ 1332 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1333 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1334 -o -name 'core' \) \ 1335 -type f -print | xargs rm -f 1336 1337 1338# Packaging of the kernel to various formats 1339# --------------------------------------------------------------------------- 1340# rpm target kept for backward compatibility 1341package-dir := scripts/package 1342 1343%src-pkg: FORCE 1344 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1345%pkg: include/config/kernel.release FORCE 1346 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1347rpm: rpm-pkg 1348 @echo " WARNING: \"rpm\" target will be removed after Linux 4.18" 1349 @echo " Please use \"rpm-pkg\" instead." 1350 1351 1352# Brief documentation of the typical targets used 1353# --------------------------------------------------------------------------- 1354 1355boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1356boards := $(sort $(notdir $(boards))) 1357board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1358board-dirs := $(sort $(notdir $(board-dirs:/=))) 1359 1360PHONY += help 1361help: 1362 @echo 'Cleaning targets:' 1363 @echo ' clean - Remove most generated files but keep the config and' 1364 @echo ' enough build support to build external modules' 1365 @echo ' mrproper - Remove all generated files + config + various backup files' 1366 @echo ' distclean - mrproper + remove editor backup and patch files' 1367 @echo '' 1368 @echo 'Configuration targets:' 1369 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1370 @echo '' 1371 @echo 'Other generic targets:' 1372 @echo ' all - Build all targets marked with [*]' 1373 @echo '* vmlinux - Build the bare kernel' 1374 @echo '* modules - Build all modules' 1375 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1376 @echo ' dir/ - Build all files in dir and below' 1377 @echo ' dir/file.[ois] - Build specified target only' 1378 @echo ' dir/file.ll - Build the LLVM assembly file' 1379 @echo ' (requires compiler support for LLVM assembly generation)' 1380 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1381 @echo ' (requires a recent binutils and recent build (System.map))' 1382 @echo ' dir/file.ko - Build module including final link' 1383 @echo ' modules_prepare - Set up for building external modules' 1384 @echo ' tags/TAGS - Generate tags file for editors' 1385 @echo ' cscope - Generate cscope index' 1386 @echo ' gtags - Generate GNU GLOBAL index' 1387 @echo ' kernelrelease - Output the release version string (use with make -s)' 1388 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1389 @echo ' image_name - Output the image name (use with make -s)' 1390 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1391 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1392 echo '' 1393 @echo 'Static analysers:' 1394 @echo ' checkstack - Generate a list of stack hogs' 1395 @echo ' namespacecheck - Name space analysis on compiled kernel' 1396 @echo ' versioncheck - Sanity check on version.h usage' 1397 @echo ' includecheck - Check for duplicate included header files' 1398 @echo ' export_report - List the usages of all exported symbols' 1399 @echo ' headers_check - Sanity check on exported headers' 1400 @echo ' headerdep - Detect inclusion cycles in headers' 1401 @echo ' coccicheck - Check with Coccinelle' 1402 @echo '' 1403 @echo 'Kernel selftest:' 1404 @echo ' kselftest - Build and run kernel selftest (run as root)' 1405 @echo ' Build, install, and boot kernel before' 1406 @echo ' running kselftest on it' 1407 @echo ' kselftest-clean - Remove all generated kselftest files' 1408 @echo ' kselftest-merge - Merge all the config dependencies of kselftest to existing' 1409 @echo ' .config.' 1410 @echo '' 1411 @echo 'Userspace tools targets:' 1412 @echo ' use "make tools/help"' 1413 @echo ' or "cd tools; make help"' 1414 @echo '' 1415 @echo 'Kernel packaging:' 1416 @$(MAKE) $(build)=$(package-dir) help 1417 @echo '' 1418 @echo 'Documentation targets:' 1419 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1420 @echo '' 1421 @echo 'Architecture specific targets ($(SRCARCH)):' 1422 @$(if $(archhelp),$(archhelp),\ 1423 echo ' No architecture specific help defined for $(SRCARCH)') 1424 @echo '' 1425 @$(if $(boards), \ 1426 $(foreach b, $(boards), \ 1427 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1428 echo '') 1429 @$(if $(board-dirs), \ 1430 $(foreach b, $(board-dirs), \ 1431 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1432 printf " %-16s - Show all of the above\\n" help-boards; \ 1433 echo '') 1434 1435 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1436 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1437 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1438 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK (sparse by default)' 1439 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1440 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1441 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where' 1442 @echo ' 1: warnings which may be relevant and do not occur too often' 1443 @echo ' 2: warnings which occur quite often but may still be relevant' 1444 @echo ' 3: more obscure warnings, can most likely be ignored' 1445 @echo ' Multiple levels can be combined with W=12 or W=123' 1446 @echo '' 1447 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1448 @echo 'For further info see the ./README file' 1449 1450 1451help-board-dirs := $(addprefix help-,$(board-dirs)) 1452 1453help-boards: $(help-board-dirs) 1454 1455boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1456 1457$(help-board-dirs): help-%: 1458 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1459 @$(if $(boards-per-dir), \ 1460 $(foreach b, $(boards-per-dir), \ 1461 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1462 echo '') 1463 1464 1465# Documentation targets 1466# --------------------------------------------------------------------------- 1467DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1468 linkcheckdocs dochelp refcheckdocs 1469PHONY += $(DOC_TARGETS) 1470$(DOC_TARGETS): scripts_basic FORCE 1471 $(Q)$(MAKE) $(build)=Documentation $@ 1472 1473else # KBUILD_EXTMOD 1474 1475### 1476# External module support. 1477# When building external modules the kernel used as basis is considered 1478# read-only, and no consistency checks are made and the make 1479# system is not used on the basis kernel. If updates are required 1480# in the basis kernel ordinary make commands (without M=...) must 1481# be used. 1482# 1483# The following are the only valid targets when building external 1484# modules. 1485# make M=dir clean Delete all automatically generated files 1486# make M=dir modules Make all modules in specified dir 1487# make M=dir Same as 'make M=dir modules' 1488# make M=dir modules_install 1489# Install the modules built in the module directory 1490# Assumes install directory is already created 1491 1492# We are always building modules 1493KBUILD_MODULES := 1 1494PHONY += crmodverdir 1495crmodverdir: 1496 $(cmd_crmodverdir) 1497 1498PHONY += $(objtree)/Module.symvers 1499$(objtree)/Module.symvers: 1500 @test -e $(objtree)/Module.symvers || ( \ 1501 echo; \ 1502 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \ 1503 echo " is missing; modules will have no dependencies and modversions."; \ 1504 echo ) 1505 1506module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD)) 1507PHONY += $(module-dirs) modules 1508$(module-dirs): crmodverdir $(objtree)/Module.symvers 1509 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@) 1510 1511modules: $(module-dirs) 1512 @$(kecho) ' Building modules, stage 2.'; 1513 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1514 1515PHONY += modules_install 1516modules_install: _emodinst_ _emodinst_post 1517 1518install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra) 1519PHONY += _emodinst_ 1520_emodinst_: 1521 $(Q)mkdir -p $(MODLIB)/$(install-dir) 1522 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1523 1524PHONY += _emodinst_post 1525_emodinst_post: _emodinst_ 1526 $(call cmd,depmod) 1527 1528clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD)) 1529 1530PHONY += $(clean-dirs) clean 1531$(clean-dirs): 1532 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1533 1534clean: rm-dirs := $(MODVERDIR) 1535clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers 1536 1537PHONY += help 1538help: 1539 @echo ' Building external modules.' 1540 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1541 @echo '' 1542 @echo ' modules - default target, build the module(s)' 1543 @echo ' modules_install - install the module' 1544 @echo ' clean - remove generated files in module directory only' 1545 @echo '' 1546 1547# Dummies... 1548PHONY += prepare scripts 1549prepare: ; 1550scripts: ; 1551endif # KBUILD_EXTMOD 1552 1553clean: $(clean-dirs) 1554 $(call cmd,rmdirs) 1555 $(call cmd,rmfiles) 1556 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1557 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \ 1558 -o -name '*.ko.*' -o -name '*.dtb' -o -name '*.dtb.S' \ 1559 -o -name '*.dwo' -o -name '*.lst' \ 1560 -o -name '*.su' \ 1561 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1562 -o -name '*.symtypes' -o -name 'modules.order' \ 1563 -o -name modules.builtin -o -name '.tmp_*.o.*' \ 1564 -o -name .cache.mk \ 1565 -o -name '*.c.[012]*.*' \ 1566 -o -name '*.ll' \ 1567 -o -name '*.gcno' \) -type f -print | xargs rm -f 1568 1569# Generate tags for editors 1570# --------------------------------------------------------------------------- 1571quiet_cmd_tags = GEN $@ 1572 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@ 1573 1574tags TAGS cscope gtags: FORCE 1575 $(call cmd,tags) 1576 1577# Scripts to check various things for consistency 1578# --------------------------------------------------------------------------- 1579 1580PHONY += includecheck versioncheck coccicheck namespacecheck export_report 1581 1582includecheck: 1583 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1584 -name '*.[hcS]' -type f -print | sort \ 1585 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1586 1587versioncheck: 1588 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1589 -name '*.[hcS]' -type f -print | sort \ 1590 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1591 1592coccicheck: 1593 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@ 1594 1595namespacecheck: 1596 $(PERL) $(srctree)/scripts/namespace.pl 1597 1598export_report: 1599 $(PERL) $(srctree)/scripts/export_report.pl 1600 1601endif #ifeq ($(config-targets),1) 1602endif #ifeq ($(mixed-targets),1) 1603 1604PHONY += checkstack kernelrelease kernelversion image_name 1605 1606# UML needs a little special treatment here. It wants to use the host 1607# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1608# else wants $(ARCH), including people doing cross-builds, which means 1609# that $(SUBARCH) doesn't work here. 1610ifeq ($(ARCH), um) 1611CHECKSTACK_ARCH := $(SUBARCH) 1612else 1613CHECKSTACK_ARCH := $(ARCH) 1614endif 1615checkstack: 1616 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1617 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1618 1619kernelrelease: 1620 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1621 1622kernelversion: 1623 @echo $(KERNELVERSION) 1624 1625image_name: 1626 @echo $(KBUILD_IMAGE) 1627 1628# Clear a bunch of variables before executing the submake 1629tools/: FORCE 1630 $(Q)mkdir -p $(objtree)/tools 1631 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ 1632 1633tools/%: FORCE 1634 $(Q)mkdir -p $(objtree)/tools 1635 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $* 1636 1637# Single targets 1638# --------------------------------------------------------------------------- 1639# Single targets are compatible with: 1640# - build with mixed source and output 1641# - build with separate output dir 'make O=...' 1642# - external modules 1643# 1644# target-dir => where to store outputfile 1645# build-dir => directory in kernel source tree to use 1646 1647ifeq ($(KBUILD_EXTMOD),) 1648 build-dir = $(patsubst %/,%,$(dir $@)) 1649 target-dir = $(dir $@) 1650else 1651 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@))) 1652 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash)) 1653 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@)) 1654endif 1655 1656%.s: %.c prepare scripts FORCE 1657 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1658%.i: %.c prepare scripts FORCE 1659 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1660%.o: %.c prepare scripts FORCE 1661 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1662%.lst: %.c prepare scripts FORCE 1663 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1664%.s: %.S prepare scripts FORCE 1665 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1666%.o: %.S prepare scripts FORCE 1667 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1668%.symtypes: %.c prepare scripts FORCE 1669 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1670%.ll: %.c prepare scripts FORCE 1671 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1672 1673# Modules 1674/: prepare scripts FORCE 1675 $(cmd_crmodverdir) 1676 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1677 $(build)=$(build-dir) 1678# Make sure the latest headers are built for Documentation 1679Documentation/ samples/: headers_install 1680%/: prepare scripts FORCE 1681 $(cmd_crmodverdir) 1682 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1683 $(build)=$(build-dir) 1684%.ko: prepare scripts FORCE 1685 $(cmd_crmodverdir) 1686 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1687 $(build)=$(build-dir) $(@:.ko=.o) 1688 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1689 1690# FIXME Should go into a make.lib or something 1691# =========================================================================== 1692 1693quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs))) 1694 cmd_rmdirs = rm -rf $(rm-dirs) 1695 1696quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1697 cmd_rmfiles = rm -f $(rm-files) 1698 1699# Run depmod only if we have System.map and depmod is executable 1700quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) 1701 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1702 $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))" 1703 1704# Create temporary dir for module support files 1705# clean it up only when building all modules 1706cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \ 1707 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*) 1708 1709# read all saved command lines 1710 1711cmd_files := $(wildcard .*.cmd $(foreach f,$(sort $(targets)),$(dir $(f)).$(notdir $(f)).cmd)) 1712 1713ifneq ($(cmd_files),) 1714 $(cmd_files): ; # Do not try to update included dependency files 1715 include $(cmd_files) 1716endif 1717 1718endif # skip-makefile 1719 1720PHONY += FORCE 1721FORCE: 1722 1723# Declare the contents of the .PHONY variable as phony. We keep that 1724# information in a variable so we can use it in if_changed and friends. 1725.PHONY: $(PHONY) 1726