1# SPDX-License-Identifier: GPL-2.0 2VERSION = 4 3PATCHLEVEL = 17 4SUBLEVEL = 0 5EXTRAVERSION = 6NAME = Merciless Moray 7 8# *DOCUMENTATION* 9# To see a list of typical targets execute "make help" 10# More info can be located in ./README 11# Comments in this file are targeted only to the developer, do not 12# expect to learn how to build the kernel reading this file. 13 14# That's our default target when none is given on the command line 15PHONY := _all 16_all: 17 18# o Do not use make's built-in rules and variables 19# (this increases performance and avoids hard-to-debug behaviour); 20# o Look for make include files relative to root of kernel src 21MAKEFLAGS += -rR --include-dir=$(CURDIR) 22 23# Avoid funny character set dependencies 24unexport LC_ALL 25LC_COLLATE=C 26LC_NUMERIC=C 27export LC_COLLATE LC_NUMERIC 28 29# Avoid interference with shell env settings 30unexport GREP_OPTIONS 31 32# We are using a recursive build, so we need to do a little thinking 33# to get the ordering right. 34# 35# Most importantly: sub-Makefiles should only ever modify files in 36# their own directory. If in some directory we have a dependency on 37# a file in another dir (which doesn't happen often, but it's often 38# unavoidable when linking the built-in.a targets which finally 39# turn into vmlinux), we will call a sub make in that other dir, and 40# after that we are sure that everything which is in that other dir 41# is now up to date. 42# 43# The only cases where we need to modify files which have global 44# effects are thus separated out and done before the recursive 45# descending is started. They are now explicitly listed as the 46# prepare rule. 47 48# Beautify output 49# --------------------------------------------------------------------------- 50# 51# Normally, we echo the whole command before executing it. By making 52# that echo $($(quiet)$(cmd)), we now have the possibility to set 53# $(quiet) to choose other forms of output instead, e.g. 54# 55# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@ 56# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< 57# 58# If $(quiet) is empty, the whole command will be printed. 59# If it is set to "quiet_", only the short version will be printed. 60# If it is set to "silent_", nothing will be printed at all, since 61# the variable $(silent_cmd_cc_o_c) doesn't exist. 62# 63# A simple variant is to prefix commands with $(Q) - that's useful 64# for commands that shall be hidden in non-verbose mode. 65# 66# $(Q)ln $@ :< 67# 68# If KBUILD_VERBOSE equals 0 then the above command will be hidden. 69# If KBUILD_VERBOSE equals 1 then the above command is displayed. 70# 71# To put more focus on warnings, be less verbose as default 72# Use 'make V=1' to see the full commands 73 74ifeq ("$(origin V)", "command line") 75 KBUILD_VERBOSE = $(V) 76endif 77ifndef KBUILD_VERBOSE 78 KBUILD_VERBOSE = 0 79endif 80 81ifeq ($(KBUILD_VERBOSE),1) 82 quiet = 83 Q = 84else 85 quiet=quiet_ 86 Q = @ 87endif 88 89# If the user is running make -s (silent mode), suppress echoing of 90# commands 91 92ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),) 93 quiet=silent_ 94 tools_silent=s 95endif 96 97export quiet Q KBUILD_VERBOSE 98 99# kbuild supports saving output files in a separate directory. 100# To locate output files in a separate directory two syntaxes are supported. 101# In both cases the working directory must be the root of the kernel src. 102# 1) O= 103# Use "make O=dir/to/store/output/files/" 104# 105# 2) Set KBUILD_OUTPUT 106# Set the environment variable KBUILD_OUTPUT to point to the directory 107# where the output files shall be placed. 108# export KBUILD_OUTPUT=dir/to/store/output/files/ 109# make 110# 111# The O= assignment takes precedence over the KBUILD_OUTPUT environment 112# variable. 113 114# KBUILD_SRC is not intended to be used by the regular user (for now), 115# it is set on invocation of make with KBUILD_OUTPUT or O= specified. 116ifeq ($(KBUILD_SRC),) 117 118# OK, Make called in directory where kernel src resides 119# Do we want to locate output files in a separate directory? 120ifeq ("$(origin O)", "command line") 121 KBUILD_OUTPUT := $(O) 122endif 123 124# Cancel implicit rules on top Makefile 125$(CURDIR)/Makefile Makefile: ; 126 127ifneq ($(words $(subst :, ,$(CURDIR))), 1) 128 $(error main directory cannot contain spaces nor colons) 129endif 130 131ifneq ($(KBUILD_OUTPUT),) 132# check that the output directory actually exists 133saved-output := $(KBUILD_OUTPUT) 134KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \ 135 && pwd) 136$(if $(KBUILD_OUTPUT),, \ 137 $(error failed to create output directory "$(saved-output)")) 138 139PHONY += $(MAKECMDGOALS) sub-make 140 141$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make 142 @: 143 144# Invoke a second make in the output directory, passing relevant variables 145sub-make: 146 $(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \ 147 -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS)) 148 149# Leave processing to above invocation of make 150skip-makefile := 1 151endif # ifneq ($(KBUILD_OUTPUT),) 152endif # ifeq ($(KBUILD_SRC),) 153 154# We process the rest of the Makefile if this is the final invocation of make 155ifeq ($(skip-makefile),) 156 157# Do not print "Entering directory ...", 158# but we want to display it when entering to the output directory 159# so that IDEs/editors are able to understand relative filenames. 160MAKEFLAGS += --no-print-directory 161 162# Call a source code checker (by default, "sparse") as part of the 163# C compilation. 164# 165# Use 'make C=1' to enable checking of only re-compiled files. 166# Use 'make C=2' to enable checking of *all* source files, regardless 167# of whether they are re-compiled or not. 168# 169# See the file "Documentation/dev-tools/sparse.rst" for more details, 170# including where to get the "sparse" utility. 171 172ifeq ("$(origin C)", "command line") 173 KBUILD_CHECKSRC = $(C) 174endif 175ifndef KBUILD_CHECKSRC 176 KBUILD_CHECKSRC = 0 177endif 178 179# Use make M=dir to specify directory of external module to build 180# Old syntax make ... SUBDIRS=$PWD is still supported 181# Setting the environment variable KBUILD_EXTMOD take precedence 182ifdef SUBDIRS 183 KBUILD_EXTMOD ?= $(SUBDIRS) 184endif 185 186ifeq ("$(origin M)", "command line") 187 KBUILD_EXTMOD := $(M) 188endif 189 190ifeq ($(KBUILD_SRC),) 191 # building in the source tree 192 srctree := . 193else 194 ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR))) 195 # building in a subdirectory of the source tree 196 srctree := .. 197 else 198 srctree := $(KBUILD_SRC) 199 endif 200endif 201 202export KBUILD_CHECKSRC KBUILD_EXTMOD KBUILD_SRC 203 204objtree := . 205src := $(srctree) 206obj := $(objtree) 207 208VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD)) 209 210export srctree objtree VPATH 211 212# To make sure we do not include .config for any of the *config targets 213# catch them early, and hand them over to scripts/kconfig/Makefile 214# It is allowed to specify more targets when calling make, including 215# mixing *config targets and build targets. 216# For example 'make oldconfig all'. 217# Detect when mixed targets is specified, and make a second invocation 218# of make so .config is not included in this case either (for *config). 219 220version_h := include/generated/uapi/linux/version.h 221old_version_h := include/linux/version.h 222 223clean-targets := %clean mrproper cleandocs 224no-dot-config-targets := $(clean-targets) \ 225 cscope gtags TAGS tags help% %docs check% coccicheck \ 226 $(version_h) headers_% archheaders archscripts \ 227 kernelversion %src-pkg 228 229config-targets := 0 230mixed-targets := 0 231dot-config := 1 232 233ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 234 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 235 dot-config := 0 236 endif 237endif 238 239ifeq ($(KBUILD_EXTMOD),) 240 ifneq ($(filter config %config,$(MAKECMDGOALS)),) 241 config-targets := 1 242 ifneq ($(words $(MAKECMDGOALS)),1) 243 mixed-targets := 1 244 endif 245 endif 246endif 247 248# For "make -j clean all", "make -j mrproper defconfig all", etc. 249ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),) 250 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) 251 mixed-targets := 1 252 endif 253endif 254 255# install and modules_install need also be processed one by one 256ifneq ($(filter install,$(MAKECMDGOALS)),) 257 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 258 mixed-targets := 1 259 endif 260endif 261 262ifeq ($(mixed-targets),1) 263# =========================================================================== 264# We're called with mixed targets (*config and build targets). 265# Handle them one by one. 266 267PHONY += $(MAKECMDGOALS) __build_one_by_one 268 269$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one 270 @: 271 272__build_one_by_one: 273 $(Q)set -e; \ 274 for i in $(MAKECMDGOALS); do \ 275 $(MAKE) -f $(srctree)/Makefile $$i; \ 276 done 277 278else 279 280# We need some generic definitions (do not try to remake the file). 281scripts/Kbuild.include: ; 282include scripts/Kbuild.include 283 284# Read KERNELRELEASE from include/config/kernel.release (if it exists) 285KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null) 286KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 287export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 288 289# SUBARCH tells the usermode build what the underlying arch is. That is set 290# first, and if a usermode build is happening, the "ARCH=um" on the command 291# line overrides the setting of ARCH below. If a native build is happening, 292# then ARCH is assigned, getting whatever value it gets normally, and 293# SUBARCH is subsequently ignored. 294 295SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \ 296 -e s/sun4u/sparc64/ \ 297 -e s/arm.*/arm/ -e s/sa110/arm/ \ 298 -e s/s390x/s390/ -e s/parisc64/parisc/ \ 299 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \ 300 -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ \ 301 -e s/riscv.*/riscv/) 302 303# Cross compiling and selecting different set of gcc/bin-utils 304# --------------------------------------------------------------------------- 305# 306# When performing cross compilation for other architectures ARCH shall be set 307# to the target architecture. (See arch/* for the possibilities). 308# ARCH can be set during invocation of make: 309# make ARCH=ia64 310# Another way is to have ARCH set in the environment. 311# The default ARCH is the host where make is executed. 312 313# CROSS_COMPILE specify the prefix used for all executables used 314# during compilation. Only gcc and related bin-utils executables 315# are prefixed with $(CROSS_COMPILE). 316# CROSS_COMPILE can be set on the command line 317# make CROSS_COMPILE=ia64-linux- 318# Alternatively CROSS_COMPILE can be set in the environment. 319# Default value for CROSS_COMPILE is not to prefix executables 320# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 321ARCH ?= $(SUBARCH) 322 323# Architecture as present in compile.h 324UTS_MACHINE := $(ARCH) 325SRCARCH := $(ARCH) 326 327# Additional ARCH settings for x86 328ifeq ($(ARCH),i386) 329 SRCARCH := x86 330endif 331ifeq ($(ARCH),x86_64) 332 SRCARCH := x86 333endif 334 335# Additional ARCH settings for sparc 336ifeq ($(ARCH),sparc32) 337 SRCARCH := sparc 338endif 339ifeq ($(ARCH),sparc64) 340 SRCARCH := sparc 341endif 342 343# Additional ARCH settings for sh 344ifeq ($(ARCH),sh64) 345 SRCARCH := sh 346endif 347 348KCONFIG_CONFIG ?= .config 349export KCONFIG_CONFIG 350 351# SHELL used by kbuild 352CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \ 353 else if [ -x /bin/bash ]; then echo /bin/bash; \ 354 else echo sh; fi ; fi) 355 356HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS) 357HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS) 358HOST_LFS_LIBS := $(shell getconf LFS_LIBS) 359 360HOSTCC = gcc 361HOSTCXX = g++ 362HOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \ 363 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) 364HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS) 365HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) 366HOST_LOADLIBES := $(HOST_LFS_LIBS) 367 368# Make variables (CC, etc...) 369AS = $(CROSS_COMPILE)as 370LD = $(CROSS_COMPILE)ld 371CC = $(CROSS_COMPILE)gcc 372CPP = $(CC) -E 373AR = $(CROSS_COMPILE)ar 374NM = $(CROSS_COMPILE)nm 375STRIP = $(CROSS_COMPILE)strip 376OBJCOPY = $(CROSS_COMPILE)objcopy 377OBJDUMP = $(CROSS_COMPILE)objdump 378LEX = flex 379YACC = bison 380AWK = awk 381GENKSYMS = scripts/genksyms/genksyms 382INSTALLKERNEL := installkernel 383DEPMOD = /sbin/depmod 384PERL = perl 385PYTHON = python 386PYTHON2 = python2 387PYTHON3 = python3 388CHECK = sparse 389 390CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 391 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 392NOSTDINC_FLAGS = 393CFLAGS_MODULE = 394AFLAGS_MODULE = 395LDFLAGS_MODULE = 396CFLAGS_KERNEL = 397AFLAGS_KERNEL = 398LDFLAGS_vmlinux = 399 400# Use USERINCLUDE when you must reference the UAPI directories only. 401USERINCLUDE := \ 402 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 403 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 404 -I$(srctree)/include/uapi \ 405 -I$(objtree)/include/generated/uapi \ 406 -include $(srctree)/include/linux/kconfig.h 407 408# Use LINUXINCLUDE when you must reference the include/ directory. 409# Needed to be compatible with the O= option 410LINUXINCLUDE := \ 411 -I$(srctree)/arch/$(SRCARCH)/include \ 412 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 413 $(if $(KBUILD_SRC), -I$(srctree)/include) \ 414 -I$(objtree)/include \ 415 $(USERINCLUDE) 416 417KBUILD_AFLAGS := -D__ASSEMBLY__ 418KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \ 419 -fno-strict-aliasing -fno-common -fshort-wchar \ 420 -Werror-implicit-function-declaration \ 421 -Wno-format-security \ 422 -std=gnu89 423KBUILD_CPPFLAGS := -D__KERNEL__ 424KBUILD_AFLAGS_KERNEL := 425KBUILD_CFLAGS_KERNEL := 426KBUILD_AFLAGS_MODULE := -DMODULE 427KBUILD_CFLAGS_MODULE := -DMODULE 428KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds 429LDFLAGS := 430GCC_PLUGINS_CFLAGS := 431 432export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC 433export CPP AR NM STRIP OBJCOPY OBJDUMP HOSTLDFLAGS HOST_LOADLIBES 434export MAKE LEX YACC AWK GENKSYMS INSTALLKERNEL PERL PYTHON PYTHON2 PYTHON3 UTS_MACHINE 435export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS 436 437export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS 438export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 439export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN 440export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 441export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 442export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 443export KBUILD_ARFLAGS 444 445export CC_VERSION_TEXT := $(shell $(CC) --version | head -n 1) 446 447# When compiling out-of-tree modules, put MODVERDIR in the module 448# tree rather than in the kernel tree. The kernel tree might 449# even be read-only. 450export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions 451 452# Files to ignore in find ... statements 453 454export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 455 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 456 -prune -o 457export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 458 --exclude CVS --exclude .pc --exclude .hg --exclude .git 459 460# =========================================================================== 461# Rules shared between *config targets and build targets 462 463# Basic helpers built in scripts/basic/ 464PHONY += scripts_basic 465scripts_basic: 466 $(Q)$(MAKE) $(build)=scripts/basic 467 $(Q)rm -f .tmp_quiet_recordmcount 468 469# To avoid any implicit rule to kick in, define an empty command. 470scripts/basic/%: scripts_basic ; 471 472PHONY += outputmakefile 473# outputmakefile generates a Makefile in the output directory, if using a 474# separate output directory. This allows convenient use of make in the 475# output directory. 476outputmakefile: 477ifneq ($(KBUILD_SRC),) 478 $(Q)ln -fsn $(srctree) source 479 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \ 480 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL) 481endif 482 483ifeq ($(cc-name),clang) 484ifneq ($(CROSS_COMPILE),) 485CLANG_TARGET := --target=$(notdir $(CROSS_COMPILE:%-=%)) 486GCC_TOOLCHAIN := $(realpath $(dir $(shell which $(LD)))/..) 487endif 488ifneq ($(GCC_TOOLCHAIN),) 489CLANG_GCC_TC := --gcc-toolchain=$(GCC_TOOLCHAIN) 490endif 491KBUILD_CFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC) 492KBUILD_AFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC) 493KBUILD_CFLAGS += $(call cc-option, -no-integrated-as) 494KBUILD_AFLAGS += $(call cc-option, -no-integrated-as) 495endif 496 497RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register 498RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk 499RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG))) 500export RETPOLINE_CFLAGS 501 502KBUILD_CFLAGS += $(call cc-option,-fno-PIE) 503KBUILD_AFLAGS += $(call cc-option,-fno-PIE) 504 505# check for 'asm goto' 506ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y) 507 CC_HAVE_ASM_GOTO := 1 508 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO 509 KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO 510endif 511 512ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/cc-can-link.sh $(CC)), y) 513 CC_CAN_LINK := y 514 export CC_CAN_LINK 515endif 516 517ifeq ($(config-targets),1) 518# =========================================================================== 519# *config targets only - make sure prerequisites are updated, and descend 520# in scripts/kconfig to make the *config target 521 522# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 523# KBUILD_DEFCONFIG may point out an alternative default configuration 524# used for 'make defconfig' 525include arch/$(SRCARCH)/Makefile 526export KBUILD_DEFCONFIG KBUILD_KCONFIG 527 528config: scripts_basic outputmakefile FORCE 529 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 530 531%config: scripts_basic outputmakefile FORCE 532 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 533 534else 535# =========================================================================== 536# Build targets only - this includes vmlinux, arch specific targets, clean 537# targets and others. In general all targets except *config targets. 538 539# If building an external module we do not care about the all: rule 540# but instead _all depend on modules 541PHONY += all 542ifeq ($(KBUILD_EXTMOD),) 543_all: all 544else 545_all: modules 546endif 547 548# Decide whether to build built-in, modular, or both. 549# Normally, just do built-in. 550 551KBUILD_MODULES := 552KBUILD_BUILTIN := 1 553 554# If we have only "make modules", don't compile built-in objects. 555# When we're building modules with modversions, we need to consider 556# the built-in objects during the descend as well, in order to 557# make sure the checksums are up to date before we record them. 558 559ifeq ($(MAKECMDGOALS),modules) 560 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1) 561endif 562 563# If we have "make <whatever> modules", compile modules 564# in addition to whatever we do anyway. 565# Just "make" or "make all" shall build modules as well 566 567ifneq ($(filter all _all modules,$(MAKECMDGOALS)),) 568 KBUILD_MODULES := 1 569endif 570 571ifeq ($(MAKECMDGOALS),) 572 KBUILD_MODULES := 1 573endif 574 575export KBUILD_MODULES KBUILD_BUILTIN 576 577ifeq ($(KBUILD_EXTMOD),) 578# Objects we will link into vmlinux / subdirs we need to visit 579init-y := init/ 580drivers-y := drivers/ sound/ firmware/ 581net-y := net/ 582libs-y := lib/ 583core-y := usr/ 584virt-y := virt/ 585endif # KBUILD_EXTMOD 586 587ifeq ($(dot-config),1) 588# Read in config 589-include include/config/auto.conf 590 591ifeq ($(KBUILD_EXTMOD),) 592# Read in dependencies to all Kconfig* files, make sure to run 593# oldconfig if changes are detected. 594-include include/config/auto.conf.cmd 595 596# To avoid any implicit rule to kick in, define an empty command 597$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ; 598 599# The actual configuration files used during the build are stored in 600# include/generated/ and include/config/. Update them if .config is newer than 601# include/config/auto.conf (which mirrors .config). 602include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd 603 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 604else 605# external modules needs include/generated/autoconf.h and include/config/auto.conf 606# but do not care if they are up-to-date. Use auto.conf to trigger the test 607PHONY += include/config/auto.conf 608 609include/config/auto.conf: 610 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 611 echo >&2; \ 612 echo >&2 " ERROR: Kernel configuration is invalid."; \ 613 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 614 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 615 echo >&2 ; \ 616 /bin/false) 617 618endif # KBUILD_EXTMOD 619 620else 621# Dummy target needed, because used as prerequisite 622include/config/auto.conf: ; 623endif # $(dot-config) 624 625# The all: target is the default when no target is given on the 626# command line. 627# This allow a user to issue only 'make' to build a kernel including modules 628# Defaults to vmlinux, but the arch makefile usually adds further targets 629all: vmlinux 630 631CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \ 632 $(call cc-option,-fno-tree-loop-im) \ 633 $(call cc-disable-warning,maybe-uninitialized,) 634export CFLAGS_GCOV CFLAGS_KCOV 635 636# The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default 637# values of the respective KBUILD_* variables 638ARCH_CPPFLAGS := 639ARCH_AFLAGS := 640ARCH_CFLAGS := 641include arch/$(SRCARCH)/Makefile 642 643KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,) 644KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) 645KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) 646KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) 647KBUILD_CFLAGS += $(call cc-disable-warning, int-in-bool-context) 648 649ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 650KBUILD_CFLAGS += $(call cc-option,-Oz,-Os) 651KBUILD_CFLAGS += $(call cc-disable-warning,maybe-uninitialized,) 652else 653ifdef CONFIG_PROFILE_ALL_BRANCHES 654KBUILD_CFLAGS += -O2 $(call cc-disable-warning,maybe-uninitialized,) 655else 656KBUILD_CFLAGS += -O2 657endif 658endif 659 660KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \ 661 $(call cc-disable-warning,maybe-uninitialized,)) 662 663# Tell gcc to never replace conditional load with a non-conditional one 664KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 665 666include scripts/Makefile.kcov 667include scripts/Makefile.gcc-plugins 668 669ifdef CONFIG_READABLE_ASM 670# Disable optimizations that make assembler listings hard to read. 671# reorder blocks reorders the control in the function 672# ipa clone creates specialized cloned functions 673# partial inlining inlines only parts of functions 674KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \ 675 $(call cc-option,-fno-ipa-cp-clone,) \ 676 $(call cc-option,-fno-partial-inlining) 677endif 678 679ifneq ($(CONFIG_FRAME_WARN),0) 680KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN}) 681endif 682 683# This selects the stack protector compiler flag. Testing it is delayed 684# until after .config has been reprocessed, in the prepare-compiler-check 685# target. 686ifdef CONFIG_CC_STACKPROTECTOR_AUTO 687 stackp-flag := $(call cc-option,-fstack-protector-strong,$(call cc-option,-fstack-protector)) 688 stackp-name := AUTO 689else 690ifdef CONFIG_CC_STACKPROTECTOR_REGULAR 691 stackp-flag := -fstack-protector 692 stackp-name := REGULAR 693else 694ifdef CONFIG_CC_STACKPROTECTOR_STRONG 695 stackp-flag := -fstack-protector-strong 696 stackp-name := STRONG 697else 698 # If either there is no stack protector for this architecture or 699 # CONFIG_CC_STACKPROTECTOR_NONE is selected, we're done, and $(stackp-name) 700 # is empty, skipping all remaining stack protector tests. 701 # 702 # Force off for distro compilers that enable stack protector by default. 703 KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector) 704endif 705endif 706endif 707# Find arch-specific stack protector compiler sanity-checking script. 708ifdef stackp-name 709ifneq ($(stackp-flag),) 710 stackp-path := $(srctree)/scripts/gcc-$(SRCARCH)_$(BITS)-has-stack-protector.sh 711 stackp-check := $(wildcard $(stackp-path)) 712 # If the wildcard test matches a test script, run it to check functionality. 713 ifdef stackp-check 714 ifneq ($(shell $(CONFIG_SHELL) $(stackp-check) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y) 715 stackp-broken := y 716 endif 717 endif 718 ifndef stackp-broken 719 # If the stack protector is functional, enable code that depends on it. 720 KBUILD_CPPFLAGS += -DCONFIG_CC_STACKPROTECTOR 721 # Either we've already detected the flag (for AUTO) or we'll fail the 722 # build in the prepare-compiler-check rule (for specific flag). 723 KBUILD_CFLAGS += $(stackp-flag) 724 else 725 # We have to make sure stack protector is unconditionally disabled if 726 # the compiler is broken (in case we're going to continue the build in 727 # AUTO mode). 728 KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector) 729 endif 730endif 731endif 732 733ifeq ($(cc-name),clang) 734KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,) 735KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier) 736KBUILD_CFLAGS += $(call cc-disable-warning, gnu) 737KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) 738# Quiet clang warning: comparison of unsigned expression < 0 is always false 739KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare) 740# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the 741# source of a reference will be _MergedGlobals and not on of the whitelisted names. 742# See modpost pattern 2 743KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,) 744KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior) 745else 746 747# These warnings generated too much noise in a regular build. 748# Use make W=1 to enable them (see scripts/Makefile.extrawarn) 749KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable) 750endif 751 752KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) 753ifdef CONFIG_FRAME_POINTER 754KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 755else 756# Some targets (ARM with Thumb2, for example), can't be built with frame 757# pointers. For those, we don't have FUNCTION_TRACER automatically 758# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 759# incompatible with -fomit-frame-pointer with current GCC, so we don't use 760# -fomit-frame-pointer with FUNCTION_TRACER. 761ifndef CONFIG_FUNCTION_TRACER 762KBUILD_CFLAGS += -fomit-frame-pointer 763endif 764endif 765 766KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments) 767 768ifdef CONFIG_DEBUG_INFO 769ifdef CONFIG_DEBUG_INFO_SPLIT 770KBUILD_CFLAGS += $(call cc-option, -gsplit-dwarf, -g) 771else 772KBUILD_CFLAGS += -g 773endif 774KBUILD_AFLAGS += -Wa,-gdwarf-2 775endif 776ifdef CONFIG_DEBUG_INFO_DWARF4 777KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,) 778endif 779 780ifdef CONFIG_DEBUG_INFO_REDUCED 781KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \ 782 $(call cc-option,-fno-var-tracking) 783endif 784 785ifdef CONFIG_FUNCTION_TRACER 786ifndef CC_FLAGS_FTRACE 787CC_FLAGS_FTRACE := -pg 788endif 789export CC_FLAGS_FTRACE 790ifdef CONFIG_HAVE_FENTRY 791CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY) 792endif 793KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY) 794KBUILD_AFLAGS += $(CC_USING_FENTRY) 795ifdef CONFIG_DYNAMIC_FTRACE 796 ifdef CONFIG_HAVE_C_RECORDMCOUNT 797 BUILD_C_RECORDMCOUNT := y 798 export BUILD_C_RECORDMCOUNT 799 endif 800endif 801endif 802 803# We trigger additional mismatches with less inlining 804ifdef CONFIG_DEBUG_SECTION_MISMATCH 805KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) 806endif 807 808ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 809KBUILD_CFLAGS_KERNEL += $(call cc-option,-ffunction-sections,) 810KBUILD_CFLAGS_KERNEL += $(call cc-option,-fdata-sections,) 811endif 812 813# arch Makefile may override CC so keep this after arch Makefile is included 814NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) 815 816# warn about C99 declaration after statement 817KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,) 818 819# disable pointer signed / unsigned warnings in gcc 4.0 820KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign) 821 822# disable invalid "can't wrap" optimizations for signed / pointers 823KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow) 824 825# clang sets -fmerge-all-constants by default as optimization, but this 826# is non-conforming behavior for C and in fact breaks the kernel, so we 827# need to disable it here generally. 828KBUILD_CFLAGS += $(call cc-option,-fno-merge-all-constants) 829 830# for gcc -fno-merge-all-constants disables everything, but it is fine 831# to have actual conforming behavior enabled. 832KBUILD_CFLAGS += $(call cc-option,-fmerge-constants) 833 834# Make sure -fstack-check isn't enabled (like gentoo apparently did) 835KBUILD_CFLAGS += $(call cc-option,-fno-stack-check,) 836 837# conserve stack if available 838KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) 839 840# disallow errors like 'EXPORT_GPL(foo);' with missing header 841KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int) 842 843# require functions to have arguments in prototypes, not empty 'int foo()' 844KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes) 845 846# Prohibit date/time macros, which would make the build non-deterministic 847KBUILD_CFLAGS += $(call cc-option,-Werror=date-time) 848 849# enforce correct pointer usage 850KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 851 852# Require designated initializers for all marked structures 853KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) 854 855# change __FILE__ to the relative path from the srctree 856KBUILD_CFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 857 858# use the deterministic mode of AR if available 859KBUILD_ARFLAGS := $(call ar-option,D) 860 861include scripts/Makefile.kasan 862include scripts/Makefile.extrawarn 863include scripts/Makefile.ubsan 864 865# Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the 866# last assignments 867KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS) 868KBUILD_AFLAGS += $(ARCH_AFLAGS) $(KAFLAGS) 869KBUILD_CFLAGS += $(ARCH_CFLAGS) $(KCFLAGS) 870 871# Use --build-id when available. 872LDFLAGS_BUILD_ID := $(call ld-option, --build-id) 873KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID) 874LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID) 875 876ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 877LDFLAGS_vmlinux += $(call ld-option, --gc-sections,) 878endif 879 880ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 881LDFLAGS_vmlinux += $(call ld-option, -X,) 882endif 883 884# insure the checker run with the right endianness 885CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 886 887# the checker needs the correct machine size 888CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 889 890# Default kernel image to build when no specific target is given. 891# KBUILD_IMAGE may be overruled on the command line or 892# set in the environment 893# Also any assignments in arch/$(ARCH)/Makefile take precedence over 894# this default value 895export KBUILD_IMAGE ?= vmlinux 896 897# 898# INSTALL_PATH specifies where to place the updated kernel and system map 899# images. Default is /boot, but you can set it to other values 900export INSTALL_PATH ?= /boot 901 902# 903# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 904# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 905# an argument if needed. Otherwise it defaults to the kernel install path 906# 907export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 908 909# 910# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 911# relocations required by build roots. This is not defined in the 912# makefile but the argument can be passed to make if needed. 913# 914 915MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 916export MODLIB 917 918# 919# INSTALL_MOD_STRIP, if defined, will cause modules to be 920# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then 921# the default option --strip-debug will be used. Otherwise, 922# INSTALL_MOD_STRIP value will be used as the options to the strip command. 923 924ifdef INSTALL_MOD_STRIP 925ifeq ($(INSTALL_MOD_STRIP),1) 926mod_strip_cmd = $(STRIP) --strip-debug 927else 928mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP) 929endif # INSTALL_MOD_STRIP=1 930else 931mod_strip_cmd = true 932endif # INSTALL_MOD_STRIP 933export mod_strip_cmd 934 935# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed 936# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP 937# or CONFIG_MODULE_COMPRESS_XZ. 938 939mod_compress_cmd = true 940ifdef CONFIG_MODULE_COMPRESS 941 ifdef CONFIG_MODULE_COMPRESS_GZIP 942 mod_compress_cmd = gzip -n -f 943 endif # CONFIG_MODULE_COMPRESS_GZIP 944 ifdef CONFIG_MODULE_COMPRESS_XZ 945 mod_compress_cmd = xz -f 946 endif # CONFIG_MODULE_COMPRESS_XZ 947endif # CONFIG_MODULE_COMPRESS 948export mod_compress_cmd 949 950# Select initial ramdisk compression format, default is gzip(1). 951# This shall be used by the dracut(8) tool while creating an initramfs image. 952# 953INITRD_COMPRESS-y := gzip 954INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2 955INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma 956INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz 957INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo 958INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4 959# do not export INITRD_COMPRESS, since we didn't actually 960# choose a sane default compression above. 961# export INITRD_COMPRESS := $(INITRD_COMPRESS-y) 962 963ifdef CONFIG_MODULE_SIG_ALL 964$(eval $(call config_filename,MODULE_SIG_KEY)) 965 966mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509 967else 968mod_sign_cmd = true 969endif 970export mod_sign_cmd 971 972ifdef CONFIG_STACK_VALIDATION 973 has_libelf := $(call try-run,\ 974 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0) 975 ifeq ($(has_libelf),1) 976 objtool_target := tools/objtool FORCE 977 else 978 ifdef CONFIG_UNWINDER_ORC 979 $(error "Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel") 980 else 981 $(warning "Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel") 982 endif 983 SKIP_STACK_VALIDATION := 1 984 export SKIP_STACK_VALIDATION 985 endif 986endif 987 988 989ifeq ($(KBUILD_EXTMOD),) 990core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/ 991 992vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \ 993 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 994 $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y))) 995 996vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \ 997 $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-)))) 998 999init-y := $(patsubst %/, %/built-in.a, $(init-y)) 1000core-y := $(patsubst %/, %/built-in.a, $(core-y)) 1001drivers-y := $(patsubst %/, %/built-in.a, $(drivers-y)) 1002net-y := $(patsubst %/, %/built-in.a, $(net-y)) 1003libs-y1 := $(patsubst %/, %/lib.a, $(libs-y)) 1004libs-y2 := $(patsubst %/, %/built-in.a, $(filter-out %.a, $(libs-y))) 1005virt-y := $(patsubst %/, %/built-in.a, $(virt-y)) 1006 1007# Externally visible symbols (used by link-vmlinux.sh) 1008export KBUILD_VMLINUX_INIT := $(head-y) $(init-y) 1009export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y2) $(drivers-y) $(net-y) $(virt-y) 1010export KBUILD_VMLINUX_LIBS := $(libs-y1) 1011export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1012export LDFLAGS_vmlinux 1013# used by scripts/package/Makefile 1014export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools) 1015 1016vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) $(KBUILD_VMLINUX_LIBS) 1017 1018# Recurse until adjust_autoksyms.sh is satisfied 1019PHONY += autoksyms_recursive 1020autoksyms_recursive: $(vmlinux-deps) 1021ifdef CONFIG_TRIM_UNUSED_KSYMS 1022 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ 1023 "$(MAKE) -f $(srctree)/Makefile vmlinux" 1024endif 1025 1026# For the kernel to actually contain only the needed exported symbols, 1027# we have to build modules as well to determine what those symbols are. 1028# (this can be evaluated only once include/config/auto.conf has been included) 1029ifdef CONFIG_TRIM_UNUSED_KSYMS 1030 KBUILD_MODULES := 1 1031endif 1032 1033autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h) 1034 1035$(autoksyms_h): 1036 $(Q)mkdir -p $(dir $@) 1037 $(Q)touch $@ 1038 1039ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink) 1040 1041# Final link of vmlinux with optional arch pass after final link 1042cmd_link-vmlinux = \ 1043 $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) ; \ 1044 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) 1045 1046vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE 1047ifdef CONFIG_HEADERS_CHECK 1048 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check 1049endif 1050ifdef CONFIG_GDB_SCRIPTS 1051 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1052endif 1053 +$(call if_changed,link-vmlinux) 1054 1055# Build samples along the rest of the kernel 1056ifdef CONFIG_SAMPLES 1057vmlinux-dirs += samples 1058endif 1059 1060# The actual objects are generated when descending, 1061# make sure no implicit rule kicks in 1062$(sort $(vmlinux-deps)): $(vmlinux-dirs) ; 1063 1064# Handle descending into subdirectories listed in $(vmlinux-dirs) 1065# Preset locale variables to speed up the build process. Limit locale 1066# tweaks to this spot to avoid wrong language settings when running 1067# make menuconfig etc. 1068# Error messages still appears in the original language 1069 1070PHONY += $(vmlinux-dirs) 1071$(vmlinux-dirs): prepare scripts 1072 $(Q)$(MAKE) $(build)=$@ need-builtin=1 1073 1074define filechk_kernel.release 1075 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1076endef 1077 1078# Store (new) KERNELRELEASE string in include/config/kernel.release 1079include/config/kernel.release: include/config/auto.conf FORCE 1080 $(call filechk,kernel.release) 1081 1082# Additional helpers built in scripts/ 1083# Carefully list dependencies so we do not try to build scripts twice 1084# in parallel 1085PHONY += scripts 1086scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \ 1087 asm-generic gcc-plugins $(autoksyms_h) 1088 $(Q)$(MAKE) $(build)=$(@) 1089 1090# Things we need to do before we recursively start building the kernel 1091# or the modules are listed in "prepare". 1092# A multi level approach is used. prepareN is processed before prepareN-1. 1093# archprepare is used in arch Makefiles and when processed asm symlink, 1094# version.h and scripts_basic is processed / created. 1095 1096# Listed in dependency order 1097PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3 1098 1099# prepare3 is used to check if we are building in a separate output directory, 1100# and if so do: 1101# 1) Check that make has not been executed in the kernel src $(srctree) 1102prepare3: include/config/kernel.release 1103ifneq ($(KBUILD_SRC),) 1104 @$(kecho) ' Using $(srctree) as source for kernel' 1105 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \ 1106 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \ 1107 echo >&2 " in the '$(srctree)' directory.";\ 1108 /bin/false; \ 1109 fi; 1110endif 1111 1112# prepare2 creates a makefile if using a separate output directory. 1113# From this point forward, .config has been reprocessed, so any rules 1114# that need to depend on updated CONFIG_* values can be checked here. 1115prepare2: prepare3 prepare-compiler-check outputmakefile asm-generic 1116 1117prepare1: prepare2 $(version_h) $(autoksyms_h) include/generated/utsrelease.h \ 1118 include/config/auto.conf 1119 $(cmd_crmodverdir) 1120 1121archprepare: archheaders archscripts prepare1 scripts_basic 1122 1123prepare0: archprepare gcc-plugins 1124 $(Q)$(MAKE) $(build)=. 1125 1126# All the preparing.. 1127prepare: prepare0 prepare-objtool 1128 1129# Support for using generic headers in asm-generic 1130PHONY += asm-generic uapi-asm-generic 1131asm-generic: uapi-asm-generic 1132 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \ 1133 src=asm obj=arch/$(SRCARCH)/include/generated/asm 1134uapi-asm-generic: 1135 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \ 1136 src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm 1137 1138PHONY += prepare-objtool 1139prepare-objtool: $(objtool_target) 1140 1141# Check for CONFIG flags that require compiler support. Abort the build 1142# after .config has been processed, but before the kernel build starts. 1143# 1144# For security-sensitive CONFIG options, we don't want to fallback and/or 1145# silently change which compiler flags will be used, since that leads to 1146# producing kernels with different security feature characteristics 1147# depending on the compiler used. (For example, "But I selected 1148# CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!") 1149PHONY += prepare-compiler-check 1150prepare-compiler-check: FORCE 1151# Make sure compiler supports requested stack protector flag. 1152ifdef stackp-name 1153 # Warn about CONFIG_CC_STACKPROTECTOR_AUTO having found no option. 1154 ifeq ($(stackp-flag),) 1155 @echo CONFIG_CC_STACKPROTECTOR_$(stackp-name): \ 1156 Compiler does not support any known stack-protector >&2 1157 else 1158 # Fail if specifically requested stack protector is missing. 1159 ifeq ($(call cc-option, $(stackp-flag)),) 1160 @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \ 1161 $(stackp-flag) not supported by compiler >&2 && exit 1 1162 endif 1163 endif 1164endif 1165# Make sure compiler does not have buggy stack-protector support. If a 1166# specific stack-protector was requested, fail the build, otherwise warn. 1167ifdef stackp-broken 1168 ifeq ($(stackp-name),AUTO) 1169 @echo CONFIG_CC_STACKPROTECTOR_$(stackp-name): \ 1170 $(stackp-flag) available but compiler is broken: disabling >&2 1171 else 1172 @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \ 1173 $(stackp-flag) available but compiler is broken >&2 && exit 1 1174 endif 1175endif 1176 @: 1177 1178# Generate some files 1179# --------------------------------------------------------------------------- 1180 1181# KERNELRELEASE can change from a few different places, meaning version.h 1182# needs to be updated, so this check is forced on all builds 1183 1184uts_len := 64 1185define filechk_utsrelease.h 1186 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1187 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1188 exit 1; \ 1189 fi; \ 1190 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";) 1191endef 1192 1193define filechk_version.h 1194 (echo \#define LINUX_VERSION_CODE $(shell \ 1195 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \ 1196 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';) 1197endef 1198 1199$(version_h): $(srctree)/Makefile FORCE 1200 $(call filechk,version.h) 1201 $(Q)rm -f $(old_version_h) 1202 1203include/generated/utsrelease.h: include/config/kernel.release FORCE 1204 $(call filechk,utsrelease.h) 1205 1206PHONY += headerdep 1207headerdep: 1208 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1209 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1210 1211# --------------------------------------------------------------------------- 1212# Kernel headers 1213 1214#Default location for installed headers 1215export INSTALL_HDR_PATH = $(objtree)/usr 1216 1217# If we do an all arch process set dst to include/arch-$(SRCARCH) 1218hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(SRCARCH), dst=include) 1219 1220PHONY += archheaders 1221archheaders: 1222 1223PHONY += archscripts 1224archscripts: 1225 1226PHONY += __headers 1227__headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts 1228 $(Q)$(MAKE) $(build)=scripts build_unifdef 1229 1230PHONY += headers_install_all 1231headers_install_all: 1232 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install 1233 1234PHONY += headers_install 1235headers_install: __headers 1236 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \ 1237 $(error Headers not exportable for the $(SRCARCH) architecture)) 1238 $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include 1239 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) 1240 1241PHONY += headers_check_all 1242headers_check_all: headers_install_all 1243 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check 1244 1245PHONY += headers_check 1246headers_check: headers_install 1247 $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1 1248 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) HDRCHECK=1 1249 1250# --------------------------------------------------------------------------- 1251# Kernel selftest 1252 1253PHONY += kselftest 1254kselftest: 1255 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1256 1257PHONY += kselftest-clean 1258kselftest-clean: 1259 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean 1260 1261PHONY += kselftest-merge 1262kselftest-merge: 1263 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1264 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \ 1265 -m $(objtree)/.config \ 1266 $(srctree)/tools/testing/selftests/*/config 1267 +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1268 1269# --------------------------------------------------------------------------- 1270# Modules 1271 1272ifdef CONFIG_MODULES 1273 1274# By default, build modules as well 1275 1276all: modules 1277 1278# Build modules 1279# 1280# A module can be listed more than once in obj-m resulting in 1281# duplicate lines in modules.order files. Those are removed 1282# using awk while concatenating to the final file. 1283 1284PHONY += modules 1285modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin 1286 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order 1287 @$(kecho) ' Building modules, stage 2.'; 1288 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1289 1290modules.builtin: $(vmlinux-dirs:%=%/modules.builtin) 1291 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin 1292 1293%/modules.builtin: include/config/auto.conf 1294 $(Q)$(MAKE) $(modbuiltin)=$* 1295 1296 1297# Target to prepare building external modules 1298PHONY += modules_prepare 1299modules_prepare: prepare scripts 1300 1301# Target to install modules 1302PHONY += modules_install 1303modules_install: _modinst_ _modinst_post 1304 1305PHONY += _modinst_ 1306_modinst_: 1307 @rm -rf $(MODLIB)/kernel 1308 @rm -f $(MODLIB)/source 1309 @mkdir -p $(MODLIB)/kernel 1310 @ln -s $(abspath $(srctree)) $(MODLIB)/source 1311 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1312 rm -f $(MODLIB)/build ; \ 1313 ln -s $(CURDIR) $(MODLIB)/build ; \ 1314 fi 1315 @cp -f $(objtree)/modules.order $(MODLIB)/ 1316 @cp -f $(objtree)/modules.builtin $(MODLIB)/ 1317 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1318 1319# This depmod is only for convenience to give the initial 1320# boot a modules.dep even before / is mounted read-write. However the 1321# boot script depmod is the master version. 1322PHONY += _modinst_post 1323_modinst_post: _modinst_ 1324 $(call cmd,depmod) 1325 1326ifeq ($(CONFIG_MODULE_SIG), y) 1327PHONY += modules_sign 1328modules_sign: 1329 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign 1330endif 1331 1332else # CONFIG_MODULES 1333 1334# Modules not configured 1335# --------------------------------------------------------------------------- 1336 1337PHONY += modules modules_install 1338modules modules_install: 1339 @echo >&2 1340 @echo >&2 "The present kernel configuration has modules disabled." 1341 @echo >&2 "Type 'make config' and enable loadable module support." 1342 @echo >&2 "Then build a kernel with module support enabled." 1343 @echo >&2 1344 @exit 1 1345 1346endif # CONFIG_MODULES 1347 1348### 1349# Cleaning is done on three levels. 1350# make clean Delete most generated files 1351# Leave enough to build external modules 1352# make mrproper Delete the current configuration, and all generated files 1353# make distclean Remove editor backup files, patch leftover files and the like 1354 1355# Directories & files removed with 'make clean' 1356CLEAN_DIRS += $(MODVERDIR) include/ksym 1357 1358# Directories & files removed with 'make mrproper' 1359MRPROPER_DIRS += include/config usr/include include/generated \ 1360 arch/*/include/generated .tmp_objdiff 1361MRPROPER_FILES += .config .config.old .version \ 1362 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \ 1363 signing_key.pem signing_key.priv signing_key.x509 \ 1364 x509.genkey extra_certificates signing_key.x509.keyid \ 1365 signing_key.x509.signer vmlinux-gdb.py 1366 1367# clean - Delete most, but leave enough to build external modules 1368# 1369clean: rm-dirs := $(CLEAN_DIRS) 1370clean: rm-files := $(CLEAN_FILES) 1371clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples) 1372 1373PHONY += $(clean-dirs) clean archclean vmlinuxclean 1374$(clean-dirs): 1375 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1376 1377vmlinuxclean: 1378 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1379 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1380 1381clean: archclean vmlinuxclean 1382 1383# mrproper - Delete all generated files, including .config 1384# 1385mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS)) 1386mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1387mrproper-dirs := $(addprefix _mrproper_,scripts) 1388 1389PHONY += $(mrproper-dirs) mrproper archmrproper 1390$(mrproper-dirs): 1391 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1392 1393mrproper: clean archmrproper $(mrproper-dirs) 1394 $(call cmd,rmdirs) 1395 $(call cmd,rmfiles) 1396 1397# distclean 1398# 1399PHONY += distclean 1400 1401distclean: mrproper 1402 @find $(srctree) $(RCS_FIND_IGNORE) \ 1403 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1404 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1405 -o -name 'core' \) \ 1406 -type f -print | xargs rm -f 1407 1408 1409# Packaging of the kernel to various formats 1410# --------------------------------------------------------------------------- 1411# rpm target kept for backward compatibility 1412package-dir := scripts/package 1413 1414%src-pkg: FORCE 1415 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1416%pkg: include/config/kernel.release FORCE 1417 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1418rpm: rpm-pkg 1419 @echo " WARNING: \"rpm\" target will be removed after Linux 4.18" 1420 @echo " Please use \"rpm-pkg\" instead." 1421 1422 1423# Brief documentation of the typical targets used 1424# --------------------------------------------------------------------------- 1425 1426boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1427boards := $(sort $(notdir $(boards))) 1428board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1429board-dirs := $(sort $(notdir $(board-dirs:/=))) 1430 1431PHONY += help 1432help: 1433 @echo 'Cleaning targets:' 1434 @echo ' clean - Remove most generated files but keep the config and' 1435 @echo ' enough build support to build external modules' 1436 @echo ' mrproper - Remove all generated files + config + various backup files' 1437 @echo ' distclean - mrproper + remove editor backup and patch files' 1438 @echo '' 1439 @echo 'Configuration targets:' 1440 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1441 @echo '' 1442 @echo 'Other generic targets:' 1443 @echo ' all - Build all targets marked with [*]' 1444 @echo '* vmlinux - Build the bare kernel' 1445 @echo '* modules - Build all modules' 1446 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1447 @echo ' dir/ - Build all files in dir and below' 1448 @echo ' dir/file.[ois] - Build specified target only' 1449 @echo ' dir/file.ll - Build the LLVM assembly file' 1450 @echo ' (requires compiler support for LLVM assembly generation)' 1451 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1452 @echo ' (requires a recent binutils and recent build (System.map))' 1453 @echo ' dir/file.ko - Build module including final link' 1454 @echo ' modules_prepare - Set up for building external modules' 1455 @echo ' tags/TAGS - Generate tags file for editors' 1456 @echo ' cscope - Generate cscope index' 1457 @echo ' gtags - Generate GNU GLOBAL index' 1458 @echo ' kernelrelease - Output the release version string (use with make -s)' 1459 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1460 @echo ' image_name - Output the image name (use with make -s)' 1461 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1462 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1463 echo '' 1464 @echo 'Static analysers:' 1465 @echo ' checkstack - Generate a list of stack hogs' 1466 @echo ' namespacecheck - Name space analysis on compiled kernel' 1467 @echo ' versioncheck - Sanity check on version.h usage' 1468 @echo ' includecheck - Check for duplicate included header files' 1469 @echo ' export_report - List the usages of all exported symbols' 1470 @echo ' headers_check - Sanity check on exported headers' 1471 @echo ' headerdep - Detect inclusion cycles in headers' 1472 @echo ' coccicheck - Check with Coccinelle' 1473 @echo '' 1474 @echo 'Kernel selftest:' 1475 @echo ' kselftest - Build and run kernel selftest (run as root)' 1476 @echo ' Build, install, and boot kernel before' 1477 @echo ' running kselftest on it' 1478 @echo ' kselftest-clean - Remove all generated kselftest files' 1479 @echo ' kselftest-merge - Merge all the config dependencies of kselftest to existing' 1480 @echo ' .config.' 1481 @echo '' 1482 @echo 'Userspace tools targets:' 1483 @echo ' use "make tools/help"' 1484 @echo ' or "cd tools; make help"' 1485 @echo '' 1486 @echo 'Kernel packaging:' 1487 @$(MAKE) $(build)=$(package-dir) help 1488 @echo '' 1489 @echo 'Documentation targets:' 1490 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1491 @echo '' 1492 @echo 'Architecture specific targets ($(SRCARCH)):' 1493 @$(if $(archhelp),$(archhelp),\ 1494 echo ' No architecture specific help defined for $(SRCARCH)') 1495 @echo '' 1496 @$(if $(boards), \ 1497 $(foreach b, $(boards), \ 1498 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1499 echo '') 1500 @$(if $(board-dirs), \ 1501 $(foreach b, $(board-dirs), \ 1502 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1503 printf " %-16s - Show all of the above\\n" help-boards; \ 1504 echo '') 1505 1506 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1507 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1508 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1509 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK (sparse by default)' 1510 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1511 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1512 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where' 1513 @echo ' 1: warnings which may be relevant and do not occur too often' 1514 @echo ' 2: warnings which occur quite often but may still be relevant' 1515 @echo ' 3: more obscure warnings, can most likely be ignored' 1516 @echo ' Multiple levels can be combined with W=12 or W=123' 1517 @echo '' 1518 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1519 @echo 'For further info see the ./README file' 1520 1521 1522help-board-dirs := $(addprefix help-,$(board-dirs)) 1523 1524help-boards: $(help-board-dirs) 1525 1526boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1527 1528$(help-board-dirs): help-%: 1529 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1530 @$(if $(boards-per-dir), \ 1531 $(foreach b, $(boards-per-dir), \ 1532 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1533 echo '') 1534 1535 1536# Documentation targets 1537# --------------------------------------------------------------------------- 1538DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1539 linkcheckdocs dochelp refcheckdocs 1540PHONY += $(DOC_TARGETS) 1541$(DOC_TARGETS): scripts_basic FORCE 1542 $(Q)$(MAKE) $(build)=Documentation $@ 1543 1544else # KBUILD_EXTMOD 1545 1546### 1547# External module support. 1548# When building external modules the kernel used as basis is considered 1549# read-only, and no consistency checks are made and the make 1550# system is not used on the basis kernel. If updates are required 1551# in the basis kernel ordinary make commands (without M=...) must 1552# be used. 1553# 1554# The following are the only valid targets when building external 1555# modules. 1556# make M=dir clean Delete all automatically generated files 1557# make M=dir modules Make all modules in specified dir 1558# make M=dir Same as 'make M=dir modules' 1559# make M=dir modules_install 1560# Install the modules built in the module directory 1561# Assumes install directory is already created 1562 1563# We are always building modules 1564KBUILD_MODULES := 1 1565PHONY += crmodverdir 1566crmodverdir: 1567 $(cmd_crmodverdir) 1568 1569PHONY += $(objtree)/Module.symvers 1570$(objtree)/Module.symvers: 1571 @test -e $(objtree)/Module.symvers || ( \ 1572 echo; \ 1573 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \ 1574 echo " is missing; modules will have no dependencies and modversions."; \ 1575 echo ) 1576 1577module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD)) 1578PHONY += $(module-dirs) modules 1579$(module-dirs): crmodverdir $(objtree)/Module.symvers 1580 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@) 1581 1582modules: $(module-dirs) 1583 @$(kecho) ' Building modules, stage 2.'; 1584 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1585 1586PHONY += modules_install 1587modules_install: _emodinst_ _emodinst_post 1588 1589install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra) 1590PHONY += _emodinst_ 1591_emodinst_: 1592 $(Q)mkdir -p $(MODLIB)/$(install-dir) 1593 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1594 1595PHONY += _emodinst_post 1596_emodinst_post: _emodinst_ 1597 $(call cmd,depmod) 1598 1599clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD)) 1600 1601PHONY += $(clean-dirs) clean 1602$(clean-dirs): 1603 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1604 1605clean: rm-dirs := $(MODVERDIR) 1606clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers 1607 1608PHONY += help 1609help: 1610 @echo ' Building external modules.' 1611 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1612 @echo '' 1613 @echo ' modules - default target, build the module(s)' 1614 @echo ' modules_install - install the module' 1615 @echo ' clean - remove generated files in module directory only' 1616 @echo '' 1617 1618# Dummies... 1619PHONY += prepare scripts 1620prepare: ; 1621scripts: ; 1622endif # KBUILD_EXTMOD 1623 1624clean: $(clean-dirs) 1625 $(call cmd,rmdirs) 1626 $(call cmd,rmfiles) 1627 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1628 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \ 1629 -o -name '*.ko.*' -o -name '*.dtb' -o -name '*.dtb.S' \ 1630 -o -name '*.dwo' -o -name '*.lst' \ 1631 -o -name '*.su' \ 1632 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1633 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 1634 -o -name '*.asn1.[ch]' \ 1635 -o -name '*.symtypes' -o -name 'modules.order' \ 1636 -o -name modules.builtin -o -name '.tmp_*.o.*' \ 1637 -o -name '*.c.[012]*.*' \ 1638 -o -name '*.ll' \ 1639 -o -name '*.gcno' \) -type f -print | xargs rm -f 1640 1641# Generate tags for editors 1642# --------------------------------------------------------------------------- 1643quiet_cmd_tags = GEN $@ 1644 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@ 1645 1646tags TAGS cscope gtags: FORCE 1647 $(call cmd,tags) 1648 1649# Scripts to check various things for consistency 1650# --------------------------------------------------------------------------- 1651 1652PHONY += includecheck versioncheck coccicheck namespacecheck export_report 1653 1654includecheck: 1655 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1656 -name '*.[hcS]' -type f -print | sort \ 1657 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1658 1659versioncheck: 1660 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1661 -name '*.[hcS]' -type f -print | sort \ 1662 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1663 1664coccicheck: 1665 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@ 1666 1667namespacecheck: 1668 $(PERL) $(srctree)/scripts/namespace.pl 1669 1670export_report: 1671 $(PERL) $(srctree)/scripts/export_report.pl 1672 1673endif #ifeq ($(config-targets),1) 1674endif #ifeq ($(mixed-targets),1) 1675 1676PHONY += checkstack kernelrelease kernelversion image_name 1677 1678# UML needs a little special treatment here. It wants to use the host 1679# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1680# else wants $(ARCH), including people doing cross-builds, which means 1681# that $(SUBARCH) doesn't work here. 1682ifeq ($(ARCH), um) 1683CHECKSTACK_ARCH := $(SUBARCH) 1684else 1685CHECKSTACK_ARCH := $(ARCH) 1686endif 1687checkstack: 1688 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1689 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1690 1691kernelrelease: 1692 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1693 1694kernelversion: 1695 @echo $(KERNELVERSION) 1696 1697image_name: 1698 @echo $(KBUILD_IMAGE) 1699 1700# Clear a bunch of variables before executing the submake 1701tools/: FORCE 1702 $(Q)mkdir -p $(objtree)/tools 1703 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ 1704 1705tools/%: FORCE 1706 $(Q)mkdir -p $(objtree)/tools 1707 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $* 1708 1709# Single targets 1710# --------------------------------------------------------------------------- 1711# Single targets are compatible with: 1712# - build with mixed source and output 1713# - build with separate output dir 'make O=...' 1714# - external modules 1715# 1716# target-dir => where to store outputfile 1717# build-dir => directory in kernel source tree to use 1718 1719ifeq ($(KBUILD_EXTMOD),) 1720 build-dir = $(patsubst %/,%,$(dir $@)) 1721 target-dir = $(dir $@) 1722else 1723 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@))) 1724 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash)) 1725 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@)) 1726endif 1727 1728%.s: %.c prepare scripts FORCE 1729 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1730%.i: %.c prepare scripts FORCE 1731 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1732%.o: %.c prepare scripts FORCE 1733 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1734%.lst: %.c prepare scripts FORCE 1735 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1736%.s: %.S prepare scripts FORCE 1737 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1738%.o: %.S prepare scripts FORCE 1739 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1740%.symtypes: %.c prepare scripts FORCE 1741 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1742%.ll: %.c prepare scripts FORCE 1743 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1744 1745# Modules 1746/: prepare scripts FORCE 1747 $(cmd_crmodverdir) 1748 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1749 $(build)=$(build-dir) 1750# Make sure the latest headers are built for Documentation 1751Documentation/ samples/: headers_install 1752%/: prepare scripts FORCE 1753 $(cmd_crmodverdir) 1754 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1755 $(build)=$(build-dir) 1756%.ko: prepare scripts FORCE 1757 $(cmd_crmodverdir) 1758 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1759 $(build)=$(build-dir) $(@:.ko=.o) 1760 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1761 1762# FIXME Should go into a make.lib or something 1763# =========================================================================== 1764 1765quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs))) 1766 cmd_rmdirs = rm -rf $(rm-dirs) 1767 1768quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1769 cmd_rmfiles = rm -f $(rm-files) 1770 1771# Run depmod only if we have System.map and depmod is executable 1772quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) 1773 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1774 $(KERNELRELEASE) 1775 1776# Create temporary dir for module support files 1777# clean it up only when building all modules 1778cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \ 1779 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*) 1780 1781# read all saved command lines 1782 1783cmd_files := $(wildcard .*.cmd $(foreach f,$(sort $(targets)),$(dir $(f)).$(notdir $(f)).cmd)) 1784 1785ifneq ($(cmd_files),) 1786 $(cmd_files): ; # Do not try to update included dependency files 1787 include $(cmd_files) 1788endif 1789 1790endif # skip-makefile 1791 1792PHONY += FORCE 1793FORCE: 1794 1795# Declare the contents of the .PHONY variable as phony. We keep that 1796# information in a variable so we can use it in if_changed and friends. 1797.PHONY: $(PHONY) 1798