1# SPDX-License-Identifier: GPL-2.0 2VERSION = 4 3PATCHLEVEL = 16 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 -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 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 438export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN 439export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 440export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 441export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 442export KBUILD_ARFLAGS 443 444# When compiling out-of-tree modules, put MODVERDIR in the module 445# tree rather than in the kernel tree. The kernel tree might 446# even be read-only. 447export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions 448 449# Files to ignore in find ... statements 450 451export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 452 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 453 -prune -o 454export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 455 --exclude CVS --exclude .pc --exclude .hg --exclude .git 456 457# =========================================================================== 458# Rules shared between *config targets and build targets 459 460# Basic helpers built in scripts/basic/ 461PHONY += scripts_basic 462scripts_basic: 463 $(Q)$(MAKE) $(build)=scripts/basic 464 $(Q)rm -f .tmp_quiet_recordmcount 465 466# To avoid any implicit rule to kick in, define an empty command. 467scripts/basic/%: scripts_basic ; 468 469PHONY += outputmakefile 470# outputmakefile generates a Makefile in the output directory, if using a 471# separate output directory. This allows convenient use of make in the 472# output directory. 473outputmakefile: 474ifneq ($(KBUILD_SRC),) 475 $(Q)ln -fsn $(srctree) source 476 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \ 477 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL) 478endif 479 480ifeq ($(cc-name),clang) 481ifneq ($(CROSS_COMPILE),) 482CLANG_TARGET := --target=$(notdir $(CROSS_COMPILE:%-=%)) 483GCC_TOOLCHAIN := $(realpath $(dir $(shell which $(LD)))/..) 484endif 485ifneq ($(GCC_TOOLCHAIN),) 486CLANG_GCC_TC := --gcc-toolchain=$(GCC_TOOLCHAIN) 487endif 488KBUILD_CFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC) 489KBUILD_AFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC) 490KBUILD_CFLAGS += $(call cc-option, -no-integrated-as) 491KBUILD_AFLAGS += $(call cc-option, -no-integrated-as) 492endif 493 494RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register 495RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk 496RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG))) 497export RETPOLINE_CFLAGS 498 499ifeq ($(config-targets),1) 500# =========================================================================== 501# *config targets only - make sure prerequisites are updated, and descend 502# in scripts/kconfig to make the *config target 503 504# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 505# KBUILD_DEFCONFIG may point out an alternative default configuration 506# used for 'make defconfig' 507include arch/$(SRCARCH)/Makefile 508export KBUILD_DEFCONFIG KBUILD_KCONFIG 509 510config: scripts_basic outputmakefile FORCE 511 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 512 513%config: scripts_basic outputmakefile FORCE 514 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 515 516else 517# =========================================================================== 518# Build targets only - this includes vmlinux, arch specific targets, clean 519# targets and others. In general all targets except *config targets. 520 521# If building an external module we do not care about the all: rule 522# but instead _all depend on modules 523PHONY += all 524ifeq ($(KBUILD_EXTMOD),) 525_all: all 526else 527_all: modules 528endif 529 530# Decide whether to build built-in, modular, or both. 531# Normally, just do built-in. 532 533KBUILD_MODULES := 534KBUILD_BUILTIN := 1 535 536# If we have only "make modules", don't compile built-in objects. 537# When we're building modules with modversions, we need to consider 538# the built-in objects during the descend as well, in order to 539# make sure the checksums are up to date before we record them. 540 541ifeq ($(MAKECMDGOALS),modules) 542 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1) 543endif 544 545# If we have "make <whatever> modules", compile modules 546# in addition to whatever we do anyway. 547# Just "make" or "make all" shall build modules as well 548 549ifneq ($(filter all _all modules,$(MAKECMDGOALS)),) 550 KBUILD_MODULES := 1 551endif 552 553ifeq ($(MAKECMDGOALS),) 554 KBUILD_MODULES := 1 555endif 556 557export KBUILD_MODULES KBUILD_BUILTIN 558 559ifeq ($(KBUILD_EXTMOD),) 560# Additional helpers built in scripts/ 561# Carefully list dependencies so we do not try to build scripts twice 562# in parallel 563PHONY += scripts 564scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \ 565 asm-generic gcc-plugins 566 $(Q)$(MAKE) $(build)=$(@) 567 568# Objects we will link into vmlinux / subdirs we need to visit 569init-y := init/ 570drivers-y := drivers/ sound/ firmware/ 571net-y := net/ 572libs-y := lib/ 573core-y := usr/ 574virt-y := virt/ 575endif # KBUILD_EXTMOD 576 577ifeq ($(dot-config),1) 578# Read in config 579-include include/config/auto.conf 580 581ifeq ($(KBUILD_EXTMOD),) 582# Read in dependencies to all Kconfig* files, make sure to run 583# oldconfig if changes are detected. 584-include include/config/auto.conf.cmd 585 586# To avoid any implicit rule to kick in, define an empty command 587$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ; 588 589# The actual configuration files used during the build are stored in 590# include/generated/ and include/config/. Update them if .config is newer than 591# include/config/auto.conf (which mirrors .config). 592include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd 593 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig 594else 595# external modules needs include/generated/autoconf.h and include/config/auto.conf 596# but do not care if they are up-to-date. Use auto.conf to trigger the test 597PHONY += include/config/auto.conf 598 599include/config/auto.conf: 600 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 601 echo >&2; \ 602 echo >&2 " ERROR: Kernel configuration is invalid."; \ 603 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 604 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 605 echo >&2 ; \ 606 /bin/false) 607 608endif # KBUILD_EXTMOD 609 610else 611# Dummy target needed, because used as prerequisite 612include/config/auto.conf: ; 613endif # $(dot-config) 614 615# For the kernel to actually contain only the needed exported symbols, 616# we have to build modules as well to determine what those symbols are. 617# (this can be evaluated only once include/config/auto.conf has been included) 618ifdef CONFIG_TRIM_UNUSED_KSYMS 619 KBUILD_MODULES := 1 620endif 621 622# The all: target is the default when no target is given on the 623# command line. 624# This allow a user to issue only 'make' to build a kernel including modules 625# Defaults to vmlinux, but the arch makefile usually adds further targets 626all: vmlinux 627 628KBUILD_CFLAGS += $(call cc-option,-fno-PIE) 629KBUILD_AFLAGS += $(call cc-option,-fno-PIE) 630CFLAGS_GCOV := -fprofile-arcs -ftest-coverage -fno-tree-loop-im $(call cc-disable-warning,maybe-uninitialized,) 631export CFLAGS_GCOV CFLAGS_KCOV 632 633# The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default 634# values of the respective KBUILD_* variables 635ARCH_CPPFLAGS := 636ARCH_AFLAGS := 637ARCH_CFLAGS := 638include arch/$(SRCARCH)/Makefile 639 640KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,) 641KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) 642KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) 643KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) 644KBUILD_CFLAGS += $(call cc-disable-warning, int-in-bool-context) 645 646ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 647KBUILD_CFLAGS += $(call cc-option,-Oz,-Os) 648KBUILD_CFLAGS += $(call cc-disable-warning,maybe-uninitialized,) 649else 650ifdef CONFIG_PROFILE_ALL_BRANCHES 651KBUILD_CFLAGS += -O2 $(call cc-disable-warning,maybe-uninitialized,) 652else 653KBUILD_CFLAGS += -O2 654endif 655endif 656 657KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \ 658 $(call cc-disable-warning,maybe-uninitialized,)) 659 660# Tell gcc to never replace conditional load with a non-conditional one 661KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 662 663# check for 'asm goto' 664ifeq ($(call shell-cached,$(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y) 665 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO 666 KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO 667endif 668 669include scripts/Makefile.kcov 670include scripts/Makefile.gcc-plugins 671 672ifdef CONFIG_READABLE_ASM 673# Disable optimizations that make assembler listings hard to read. 674# reorder blocks reorders the control in the function 675# ipa clone creates specialized cloned functions 676# partial inlining inlines only parts of functions 677KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \ 678 $(call cc-option,-fno-ipa-cp-clone,) \ 679 $(call cc-option,-fno-partial-inlining) 680endif 681 682ifneq ($(CONFIG_FRAME_WARN),0) 683KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN}) 684endif 685 686# This selects the stack protector compiler flag. Testing it is delayed 687# until after .config has been reprocessed, in the prepare-compiler-check 688# target. 689ifdef CONFIG_CC_STACKPROTECTOR_AUTO 690 stackp-flag := $(call cc-option,-fstack-protector-strong,$(call cc-option,-fstack-protector)) 691 stackp-name := AUTO 692else 693ifdef CONFIG_CC_STACKPROTECTOR_REGULAR 694 stackp-flag := -fstack-protector 695 stackp-name := REGULAR 696else 697ifdef CONFIG_CC_STACKPROTECTOR_STRONG 698 stackp-flag := -fstack-protector-strong 699 stackp-name := STRONG 700else 701 # If either there is no stack protector for this architecture or 702 # CONFIG_CC_STACKPROTECTOR_NONE is selected, we're done, and $(stackp-name) 703 # is empty, skipping all remaining stack protector tests. 704 # 705 # Force off for distro compilers that enable stack protector by default. 706 KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector) 707endif 708endif 709endif 710# Find arch-specific stack protector compiler sanity-checking script. 711ifdef stackp-name 712ifneq ($(stackp-flag),) 713 stackp-path := $(srctree)/scripts/gcc-$(SRCARCH)_$(BITS)-has-stack-protector.sh 714 stackp-check := $(wildcard $(stackp-path)) 715 # If the wildcard test matches a test script, run it to check functionality. 716 ifdef stackp-check 717 ifneq ($(shell $(CONFIG_SHELL) $(stackp-check) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y) 718 stackp-broken := y 719 endif 720 endif 721 ifndef stackp-broken 722 # If the stack protector is functional, enable code that depends on it. 723 KBUILD_CPPFLAGS += -DCONFIG_CC_STACKPROTECTOR 724 # Either we've already detected the flag (for AUTO) or we'll fail the 725 # build in the prepare-compiler-check rule (for specific flag). 726 KBUILD_CFLAGS += $(stackp-flag) 727 else 728 # We have to make sure stack protector is unconditionally disabled if 729 # the compiler is broken (in case we're going to continue the build in 730 # AUTO mode). 731 KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector) 732 endif 733endif 734endif 735 736ifeq ($(cc-name),clang) 737KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,) 738KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier) 739KBUILD_CFLAGS += $(call cc-disable-warning, gnu) 740KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) 741# Quiet clang warning: comparison of unsigned expression < 0 is always false 742KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare) 743# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the 744# source of a reference will be _MergedGlobals and not on of the whitelisted names. 745# See modpost pattern 2 746KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,) 747KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior) 748else 749 750# These warnings generated too much noise in a regular build. 751# Use make W=1 to enable them (see scripts/Makefile.extrawarn) 752KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable) 753endif 754 755KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) 756ifdef CONFIG_FRAME_POINTER 757KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 758else 759# Some targets (ARM with Thumb2, for example), can't be built with frame 760# pointers. For those, we don't have FUNCTION_TRACER automatically 761# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 762# incompatible with -fomit-frame-pointer with current GCC, so we don't use 763# -fomit-frame-pointer with FUNCTION_TRACER. 764ifndef CONFIG_FUNCTION_TRACER 765KBUILD_CFLAGS += -fomit-frame-pointer 766endif 767endif 768 769KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments) 770 771ifdef CONFIG_DEBUG_INFO 772ifdef CONFIG_DEBUG_INFO_SPLIT 773KBUILD_CFLAGS += $(call cc-option, -gsplit-dwarf, -g) 774else 775KBUILD_CFLAGS += -g 776endif 777KBUILD_AFLAGS += -Wa,-gdwarf-2 778endif 779ifdef CONFIG_DEBUG_INFO_DWARF4 780KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,) 781endif 782 783ifdef CONFIG_DEBUG_INFO_REDUCED 784KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \ 785 $(call cc-option,-fno-var-tracking) 786endif 787 788ifdef CONFIG_FUNCTION_TRACER 789ifndef CC_FLAGS_FTRACE 790CC_FLAGS_FTRACE := -pg 791endif 792export CC_FLAGS_FTRACE 793ifdef CONFIG_HAVE_FENTRY 794CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY) 795endif 796KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY) 797KBUILD_AFLAGS += $(CC_USING_FENTRY) 798ifdef CONFIG_DYNAMIC_FTRACE 799 ifdef CONFIG_HAVE_C_RECORDMCOUNT 800 BUILD_C_RECORDMCOUNT := y 801 export BUILD_C_RECORDMCOUNT 802 endif 803endif 804endif 805 806# We trigger additional mismatches with less inlining 807ifdef CONFIG_DEBUG_SECTION_MISMATCH 808KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) 809endif 810 811ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 812KBUILD_CFLAGS += $(call cc-option,-ffunction-sections,) 813KBUILD_CFLAGS += $(call cc-option,-fdata-sections,) 814endif 815 816# arch Makefile may override CC so keep this after arch Makefile is included 817NOSTDINC_FLAGS += -nostdinc -isystem $(call shell-cached,$(CC) -print-file-name=include) 818CHECKFLAGS += $(NOSTDINC_FLAGS) 819 820# warn about C99 declaration after statement 821KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,) 822 823# disable pointer signed / unsigned warnings in gcc 4.0 824KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign) 825 826# disable invalid "can't wrap" optimizations for signed / pointers 827KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow) 828 829# clang sets -fmerge-all-constants by default as optimization, but this 830# is non-conforming behavior for C and in fact breaks the kernel, so we 831# need to disable it here generally. 832KBUILD_CFLAGS += $(call cc-option,-fno-merge-all-constants) 833 834# for gcc -fno-merge-all-constants disables everything, but it is fine 835# to have actual conforming behavior enabled. 836KBUILD_CFLAGS += $(call cc-option,-fmerge-constants) 837 838# Make sure -fstack-check isn't enabled (like gentoo apparently did) 839KBUILD_CFLAGS += $(call cc-option,-fno-stack-check,) 840 841# conserve stack if available 842KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) 843 844# disallow errors like 'EXPORT_GPL(foo);' with missing header 845KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int) 846 847# require functions to have arguments in prototypes, not empty 'int foo()' 848KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes) 849 850# Prohibit date/time macros, which would make the build non-deterministic 851KBUILD_CFLAGS += $(call cc-option,-Werror=date-time) 852 853# enforce correct pointer usage 854KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 855 856# Require designated initializers for all marked structures 857KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) 858 859# use the deterministic mode of AR if available 860KBUILD_ARFLAGS := $(call ar-option,D) 861 862include scripts/Makefile.kasan 863include scripts/Makefile.extrawarn 864include scripts/Makefile.ubsan 865 866# Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the 867# last assignments 868KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS) 869KBUILD_AFLAGS += $(ARCH_AFLAGS) $(KAFLAGS) 870KBUILD_CFLAGS += $(ARCH_CFLAGS) $(KCFLAGS) 871 872# Use --build-id when available. 873LDFLAGS_BUILD_ID := $(call ld-option, --build-id) 874KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID) 875LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID) 876 877ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 878LDFLAGS_vmlinux += $(call ld-option, --gc-sections,) 879endif 880 881ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 882LDFLAGS_vmlinux += $(call ld-option, -X,) 883endif 884 885# Default kernel image to build when no specific target is given. 886# KBUILD_IMAGE may be overruled on the command line or 887# set in the environment 888# Also any assignments in arch/$(ARCH)/Makefile take precedence over 889# this default value 890export KBUILD_IMAGE ?= vmlinux 891 892# 893# INSTALL_PATH specifies where to place the updated kernel and system map 894# images. Default is /boot, but you can set it to other values 895export INSTALL_PATH ?= /boot 896 897# 898# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 899# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 900# an argument if needed. Otherwise it defaults to the kernel install path 901# 902export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 903 904# 905# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 906# relocations required by build roots. This is not defined in the 907# makefile but the argument can be passed to make if needed. 908# 909 910MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 911export MODLIB 912 913# 914# INSTALL_MOD_STRIP, if defined, will cause modules to be 915# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then 916# the default option --strip-debug will be used. Otherwise, 917# INSTALL_MOD_STRIP value will be used as the options to the strip command. 918 919ifdef INSTALL_MOD_STRIP 920ifeq ($(INSTALL_MOD_STRIP),1) 921mod_strip_cmd = $(STRIP) --strip-debug 922else 923mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP) 924endif # INSTALL_MOD_STRIP=1 925else 926mod_strip_cmd = true 927endif # INSTALL_MOD_STRIP 928export mod_strip_cmd 929 930# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed 931# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP 932# or CONFIG_MODULE_COMPRESS_XZ. 933 934mod_compress_cmd = true 935ifdef CONFIG_MODULE_COMPRESS 936 ifdef CONFIG_MODULE_COMPRESS_GZIP 937 mod_compress_cmd = gzip -n -f 938 endif # CONFIG_MODULE_COMPRESS_GZIP 939 ifdef CONFIG_MODULE_COMPRESS_XZ 940 mod_compress_cmd = xz -f 941 endif # CONFIG_MODULE_COMPRESS_XZ 942endif # CONFIG_MODULE_COMPRESS 943export mod_compress_cmd 944 945# Select initial ramdisk compression format, default is gzip(1). 946# This shall be used by the dracut(8) tool while creating an initramfs image. 947# 948INITRD_COMPRESS-y := gzip 949INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2 950INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma 951INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz 952INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo 953INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4 954# do not export INITRD_COMPRESS, since we didn't actually 955# choose a sane default compression above. 956# export INITRD_COMPRESS := $(INITRD_COMPRESS-y) 957 958ifdef CONFIG_MODULE_SIG_ALL 959$(eval $(call config_filename,MODULE_SIG_KEY)) 960 961mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509 962else 963mod_sign_cmd = true 964endif 965export mod_sign_cmd 966 967ifdef CONFIG_STACK_VALIDATION 968 has_libelf := $(call try-run,\ 969 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0) 970 ifeq ($(has_libelf),1) 971 objtool_target := tools/objtool FORCE 972 else 973 ifdef CONFIG_UNWINDER_ORC 974 $(error "Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel") 975 else 976 $(warning "Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel") 977 endif 978 SKIP_STACK_VALIDATION := 1 979 export SKIP_STACK_VALIDATION 980 endif 981endif 982 983 984ifeq ($(KBUILD_EXTMOD),) 985core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/ 986 987vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \ 988 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 989 $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y))) 990 991vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \ 992 $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-)))) 993 994init-y := $(patsubst %/, %/built-in.o, $(init-y)) 995core-y := $(patsubst %/, %/built-in.o, $(core-y)) 996drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y)) 997net-y := $(patsubst %/, %/built-in.o, $(net-y)) 998libs-y1 := $(patsubst %/, %/lib.a, $(libs-y)) 999libs-y2 := $(filter-out %.a, $(patsubst %/, %/built-in.o, $(libs-y))) 1000virt-y := $(patsubst %/, %/built-in.o, $(virt-y)) 1001 1002# Externally visible symbols (used by link-vmlinux.sh) 1003export KBUILD_VMLINUX_INIT := $(head-y) $(init-y) 1004export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y2) $(drivers-y) $(net-y) $(virt-y) 1005export KBUILD_VMLINUX_LIBS := $(libs-y1) 1006export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1007export LDFLAGS_vmlinux 1008# used by scripts/package/Makefile 1009export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools) 1010 1011vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) $(KBUILD_VMLINUX_LIBS) 1012 1013# Include targets which we want to execute sequentially if the rest of the 1014# kernel build went well. If CONFIG_TRIM_UNUSED_KSYMS is set, this might be 1015# evaluated more than once. 1016PHONY += vmlinux_prereq 1017vmlinux_prereq: $(vmlinux-deps) FORCE 1018ifdef CONFIG_HEADERS_CHECK 1019 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check 1020endif 1021ifdef CONFIG_GDB_SCRIPTS 1022 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1023endif 1024ifdef CONFIG_TRIM_UNUSED_KSYMS 1025 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ 1026 "$(MAKE) -f $(srctree)/Makefile vmlinux" 1027endif 1028 1029# standalone target for easier testing 1030include/generated/autoksyms.h: FORCE 1031 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh true 1032 1033ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink) 1034 1035# Final link of vmlinux with optional arch pass after final link 1036cmd_link-vmlinux = \ 1037 $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) ; \ 1038 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) 1039 1040vmlinux: scripts/link-vmlinux.sh vmlinux_prereq $(vmlinux-deps) FORCE 1041 +$(call if_changed,link-vmlinux) 1042 1043# Build samples along the rest of the kernel 1044ifdef CONFIG_SAMPLES 1045vmlinux-dirs += samples 1046endif 1047 1048# The actual objects are generated when descending, 1049# make sure no implicit rule kicks in 1050$(sort $(vmlinux-deps)): $(vmlinux-dirs) ; 1051 1052# Handle descending into subdirectories listed in $(vmlinux-dirs) 1053# Preset locale variables to speed up the build process. Limit locale 1054# tweaks to this spot to avoid wrong language settings when running 1055# make menuconfig etc. 1056# Error messages still appears in the original language 1057 1058PHONY += $(vmlinux-dirs) 1059$(vmlinux-dirs): prepare scripts 1060 $(Q)$(MAKE) $(build)=$@ need-builtin=1 1061 1062define filechk_kernel.release 1063 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1064endef 1065 1066# Store (new) KERNELRELEASE string in include/config/kernel.release 1067include/config/kernel.release: include/config/auto.conf FORCE 1068 $(call filechk,kernel.release) 1069 1070 1071# Things we need to do before we recursively start building the kernel 1072# or the modules are listed in "prepare". 1073# A multi level approach is used. prepareN is processed before prepareN-1. 1074# archprepare is used in arch Makefiles and when processed asm symlink, 1075# version.h and scripts_basic is processed / created. 1076 1077# Listed in dependency order 1078PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3 1079 1080# prepare3 is used to check if we are building in a separate output directory, 1081# and if so do: 1082# 1) Check that make has not been executed in the kernel src $(srctree) 1083prepare3: include/config/kernel.release 1084ifneq ($(KBUILD_SRC),) 1085 @$(kecho) ' Using $(srctree) as source for kernel' 1086 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \ 1087 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \ 1088 echo >&2 " in the '$(srctree)' directory.";\ 1089 /bin/false; \ 1090 fi; 1091endif 1092 1093# prepare2 creates a makefile if using a separate output directory. 1094# From this point forward, .config has been reprocessed, so any rules 1095# that need to depend on updated CONFIG_* values can be checked here. 1096prepare2: prepare3 prepare-compiler-check outputmakefile asm-generic 1097 1098prepare1: prepare2 $(version_h) include/generated/utsrelease.h \ 1099 include/config/auto.conf 1100 $(cmd_crmodverdir) 1101 1102archprepare: archheaders archscripts prepare1 scripts_basic 1103 1104prepare0: archprepare gcc-plugins 1105 $(Q)$(MAKE) $(build)=. 1106 1107# All the preparing.. 1108prepare: prepare0 prepare-objtool 1109 1110# Support for using generic headers in asm-generic 1111PHONY += asm-generic uapi-asm-generic 1112asm-generic: uapi-asm-generic 1113 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \ 1114 src=asm obj=arch/$(SRCARCH)/include/generated/asm 1115uapi-asm-generic: 1116 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \ 1117 src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm 1118 1119PHONY += prepare-objtool 1120prepare-objtool: $(objtool_target) 1121 1122# Check for CONFIG flags that require compiler support. Abort the build 1123# after .config has been processed, but before the kernel build starts. 1124# 1125# For security-sensitive CONFIG options, we don't want to fallback and/or 1126# silently change which compiler flags will be used, since that leads to 1127# producing kernels with different security feature characteristics 1128# depending on the compiler used. (For example, "But I selected 1129# CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!") 1130PHONY += prepare-compiler-check 1131prepare-compiler-check: FORCE 1132# Make sure compiler supports requested stack protector flag. 1133ifdef stackp-name 1134 # Warn about CONFIG_CC_STACKPROTECTOR_AUTO having found no option. 1135 ifeq ($(stackp-flag),) 1136 @echo CONFIG_CC_STACKPROTECTOR_$(stackp-name): \ 1137 Compiler does not support any known stack-protector >&2 1138 else 1139 # Fail if specifically requested stack protector is missing. 1140 ifeq ($(call cc-option, $(stackp-flag)),) 1141 @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \ 1142 $(stackp-flag) not supported by compiler >&2 && exit 1 1143 endif 1144 endif 1145endif 1146# Make sure compiler does not have buggy stack-protector support. If a 1147# specific stack-protector was requested, fail the build, otherwise warn. 1148ifdef stackp-broken 1149 ifeq ($(stackp-name),AUTO) 1150 @echo CONFIG_CC_STACKPROTECTOR_$(stackp-name): \ 1151 $(stackp-flag) available but compiler is broken: disabling >&2 1152 else 1153 @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \ 1154 $(stackp-flag) available but compiler is broken >&2 && exit 1 1155 endif 1156endif 1157 @: 1158 1159# Generate some files 1160# --------------------------------------------------------------------------- 1161 1162# KERNELRELEASE can change from a few different places, meaning version.h 1163# needs to be updated, so this check is forced on all builds 1164 1165uts_len := 64 1166define filechk_utsrelease.h 1167 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1168 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1169 exit 1; \ 1170 fi; \ 1171 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";) 1172endef 1173 1174define filechk_version.h 1175 (echo \#define LINUX_VERSION_CODE $(shell \ 1176 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \ 1177 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';) 1178endef 1179 1180$(version_h): $(srctree)/Makefile FORCE 1181 $(call filechk,version.h) 1182 $(Q)rm -f $(old_version_h) 1183 1184include/generated/utsrelease.h: include/config/kernel.release FORCE 1185 $(call filechk,utsrelease.h) 1186 1187PHONY += headerdep 1188headerdep: 1189 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1190 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1191 1192# --------------------------------------------------------------------------- 1193# Kernel headers 1194 1195#Default location for installed headers 1196export INSTALL_HDR_PATH = $(objtree)/usr 1197 1198# If we do an all arch process set dst to include/arch-$(SRCARCH) 1199hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(SRCARCH), dst=include) 1200 1201PHONY += archheaders 1202archheaders: 1203 1204PHONY += archscripts 1205archscripts: 1206 1207PHONY += __headers 1208__headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts 1209 $(Q)$(MAKE) $(build)=scripts build_unifdef 1210 1211PHONY += headers_install_all 1212headers_install_all: 1213 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install 1214 1215PHONY += headers_install 1216headers_install: __headers 1217 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \ 1218 $(error Headers not exportable for the $(SRCARCH) architecture)) 1219 $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include 1220 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) 1221 1222PHONY += headers_check_all 1223headers_check_all: headers_install_all 1224 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check 1225 1226PHONY += headers_check 1227headers_check: headers_install 1228 $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1 1229 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) HDRCHECK=1 1230 1231# --------------------------------------------------------------------------- 1232# Kernel selftest 1233 1234PHONY += kselftest 1235kselftest: 1236 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1237 1238PHONY += kselftest-clean 1239kselftest-clean: 1240 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean 1241 1242PHONY += kselftest-merge 1243kselftest-merge: 1244 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1245 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \ 1246 -m $(objtree)/.config \ 1247 $(srctree)/tools/testing/selftests/*/config 1248 +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1249 1250# --------------------------------------------------------------------------- 1251# Modules 1252 1253ifdef CONFIG_MODULES 1254 1255# By default, build modules as well 1256 1257all: modules 1258 1259# Build modules 1260# 1261# A module can be listed more than once in obj-m resulting in 1262# duplicate lines in modules.order files. Those are removed 1263# using awk while concatenating to the final file. 1264 1265PHONY += modules 1266modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin 1267 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order 1268 @$(kecho) ' Building modules, stage 2.'; 1269 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1270 1271modules.builtin: $(vmlinux-dirs:%=%/modules.builtin) 1272 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin 1273 1274%/modules.builtin: include/config/auto.conf 1275 $(Q)$(MAKE) $(modbuiltin)=$* 1276 1277 1278# Target to prepare building external modules 1279PHONY += modules_prepare 1280modules_prepare: prepare scripts 1281 1282# Target to install modules 1283PHONY += modules_install 1284modules_install: _modinst_ _modinst_post 1285 1286PHONY += _modinst_ 1287_modinst_: 1288 @rm -rf $(MODLIB)/kernel 1289 @rm -f $(MODLIB)/source 1290 @mkdir -p $(MODLIB)/kernel 1291 @ln -s $(abspath $(srctree)) $(MODLIB)/source 1292 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1293 rm -f $(MODLIB)/build ; \ 1294 ln -s $(CURDIR) $(MODLIB)/build ; \ 1295 fi 1296 @cp -f $(objtree)/modules.order $(MODLIB)/ 1297 @cp -f $(objtree)/modules.builtin $(MODLIB)/ 1298 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1299 1300# This depmod is only for convenience to give the initial 1301# boot a modules.dep even before / is mounted read-write. However the 1302# boot script depmod is the master version. 1303PHONY += _modinst_post 1304_modinst_post: _modinst_ 1305 $(call cmd,depmod) 1306 1307ifeq ($(CONFIG_MODULE_SIG), y) 1308PHONY += modules_sign 1309modules_sign: 1310 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign 1311endif 1312 1313else # CONFIG_MODULES 1314 1315# Modules not configured 1316# --------------------------------------------------------------------------- 1317 1318PHONY += modules modules_install 1319modules modules_install: 1320 @echo >&2 1321 @echo >&2 "The present kernel configuration has modules disabled." 1322 @echo >&2 "Type 'make config' and enable loadable module support." 1323 @echo >&2 "Then build a kernel with module support enabled." 1324 @echo >&2 1325 @exit 1 1326 1327endif # CONFIG_MODULES 1328 1329### 1330# Cleaning is done on three levels. 1331# make clean Delete most generated files 1332# Leave enough to build external modules 1333# make mrproper Delete the current configuration, and all generated files 1334# make distclean Remove editor backup files, patch leftover files and the like 1335 1336# Directories & files removed with 'make clean' 1337CLEAN_DIRS += $(MODVERDIR) 1338 1339# Directories & files removed with 'make mrproper' 1340MRPROPER_DIRS += include/config usr/include include/generated \ 1341 arch/*/include/generated .tmp_objdiff 1342MRPROPER_FILES += .config .config.old .version \ 1343 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \ 1344 signing_key.pem signing_key.priv signing_key.x509 \ 1345 x509.genkey extra_certificates signing_key.x509.keyid \ 1346 signing_key.x509.signer vmlinux-gdb.py 1347 1348# clean - Delete most, but leave enough to build external modules 1349# 1350clean: rm-dirs := $(CLEAN_DIRS) 1351clean: rm-files := $(CLEAN_FILES) 1352clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples) 1353 1354PHONY += $(clean-dirs) clean archclean vmlinuxclean 1355$(clean-dirs): 1356 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1357 1358vmlinuxclean: 1359 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1360 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1361 1362clean: archclean vmlinuxclean 1363 1364# mrproper - Delete all generated files, including .config 1365# 1366mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS)) 1367mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1368mrproper-dirs := $(addprefix _mrproper_,scripts) 1369 1370PHONY += $(mrproper-dirs) mrproper archmrproper 1371$(mrproper-dirs): 1372 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1373 1374mrproper: clean archmrproper $(mrproper-dirs) 1375 $(call cmd,rmdirs) 1376 $(call cmd,rmfiles) 1377 1378# distclean 1379# 1380PHONY += distclean 1381 1382distclean: mrproper 1383 @find $(srctree) $(RCS_FIND_IGNORE) \ 1384 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1385 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1386 -o -name 'core' \) \ 1387 -type f -print | xargs rm -f 1388 1389 1390# Packaging of the kernel to various formats 1391# --------------------------------------------------------------------------- 1392# rpm target kept for backward compatibility 1393package-dir := scripts/package 1394 1395%src-pkg: FORCE 1396 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1397%pkg: include/config/kernel.release FORCE 1398 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1399rpm: rpm-pkg 1400 @echo " WARNING: \"rpm\" target will be removed after Linux 4.18" 1401 @echo " Please use \"rpm-pkg\" instead." 1402 1403 1404# Brief documentation of the typical targets used 1405# --------------------------------------------------------------------------- 1406 1407boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1408boards := $(sort $(notdir $(boards))) 1409board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1410board-dirs := $(sort $(notdir $(board-dirs:/=))) 1411 1412PHONY += help 1413help: 1414 @echo 'Cleaning targets:' 1415 @echo ' clean - Remove most generated files but keep the config and' 1416 @echo ' enough build support to build external modules' 1417 @echo ' mrproper - Remove all generated files + config + various backup files' 1418 @echo ' distclean - mrproper + remove editor backup and patch files' 1419 @echo '' 1420 @echo 'Configuration targets:' 1421 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1422 @echo '' 1423 @echo 'Other generic targets:' 1424 @echo ' all - Build all targets marked with [*]' 1425 @echo '* vmlinux - Build the bare kernel' 1426 @echo '* modules - Build all modules' 1427 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1428 @echo ' dir/ - Build all files in dir and below' 1429 @echo ' dir/file.[ois] - Build specified target only' 1430 @echo ' dir/file.ll - Build the LLVM assembly file' 1431 @echo ' (requires compiler support for LLVM assembly generation)' 1432 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1433 @echo ' (requires a recent binutils and recent build (System.map))' 1434 @echo ' dir/file.ko - Build module including final link' 1435 @echo ' modules_prepare - Set up for building external modules' 1436 @echo ' tags/TAGS - Generate tags file for editors' 1437 @echo ' cscope - Generate cscope index' 1438 @echo ' gtags - Generate GNU GLOBAL index' 1439 @echo ' kernelrelease - Output the release version string (use with make -s)' 1440 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1441 @echo ' image_name - Output the image name (use with make -s)' 1442 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1443 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1444 echo '' 1445 @echo 'Static analysers:' 1446 @echo ' checkstack - Generate a list of stack hogs' 1447 @echo ' namespacecheck - Name space analysis on compiled kernel' 1448 @echo ' versioncheck - Sanity check on version.h usage' 1449 @echo ' includecheck - Check for duplicate included header files' 1450 @echo ' export_report - List the usages of all exported symbols' 1451 @echo ' headers_check - Sanity check on exported headers' 1452 @echo ' headerdep - Detect inclusion cycles in headers' 1453 @echo ' coccicheck - Check with Coccinelle' 1454 @echo '' 1455 @echo 'Kernel selftest:' 1456 @echo ' kselftest - Build and run kernel selftest (run as root)' 1457 @echo ' Build, install, and boot kernel before' 1458 @echo ' running kselftest on it' 1459 @echo ' kselftest-clean - Remove all generated kselftest files' 1460 @echo ' kselftest-merge - Merge all the config dependencies of kselftest to existing' 1461 @echo ' .config.' 1462 @echo '' 1463 @echo 'Userspace tools targets:' 1464 @echo ' use "make tools/help"' 1465 @echo ' or "cd tools; make help"' 1466 @echo '' 1467 @echo 'Kernel packaging:' 1468 @$(MAKE) $(build)=$(package-dir) help 1469 @echo '' 1470 @echo 'Documentation targets:' 1471 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1472 @echo '' 1473 @echo 'Architecture specific targets ($(SRCARCH)):' 1474 @$(if $(archhelp),$(archhelp),\ 1475 echo ' No architecture specific help defined for $(SRCARCH)') 1476 @echo '' 1477 @$(if $(boards), \ 1478 $(foreach b, $(boards), \ 1479 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1480 echo '') 1481 @$(if $(board-dirs), \ 1482 $(foreach b, $(board-dirs), \ 1483 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1484 printf " %-16s - Show all of the above\\n" help-boards; \ 1485 echo '') 1486 1487 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1488 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1489 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1490 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK (sparse by default)' 1491 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1492 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1493 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where' 1494 @echo ' 1: warnings which may be relevant and do not occur too often' 1495 @echo ' 2: warnings which occur quite often but may still be relevant' 1496 @echo ' 3: more obscure warnings, can most likely be ignored' 1497 @echo ' Multiple levels can be combined with W=12 or W=123' 1498 @echo '' 1499 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1500 @echo 'For further info see the ./README file' 1501 1502 1503help-board-dirs := $(addprefix help-,$(board-dirs)) 1504 1505help-boards: $(help-board-dirs) 1506 1507boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1508 1509$(help-board-dirs): help-%: 1510 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1511 @$(if $(boards-per-dir), \ 1512 $(foreach b, $(boards-per-dir), \ 1513 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1514 echo '') 1515 1516 1517# Documentation targets 1518# --------------------------------------------------------------------------- 1519DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1520 linkcheckdocs dochelp refcheckdocs 1521PHONY += $(DOC_TARGETS) 1522$(DOC_TARGETS): scripts_basic FORCE 1523 $(Q)$(MAKE) $(build)=Documentation $@ 1524 1525else # KBUILD_EXTMOD 1526 1527### 1528# External module support. 1529# When building external modules the kernel used as basis is considered 1530# read-only, and no consistency checks are made and the make 1531# system is not used on the basis kernel. If updates are required 1532# in the basis kernel ordinary make commands (without M=...) must 1533# be used. 1534# 1535# The following are the only valid targets when building external 1536# modules. 1537# make M=dir clean Delete all automatically generated files 1538# make M=dir modules Make all modules in specified dir 1539# make M=dir Same as 'make M=dir modules' 1540# make M=dir modules_install 1541# Install the modules built in the module directory 1542# Assumes install directory is already created 1543 1544# We are always building modules 1545KBUILD_MODULES := 1 1546PHONY += crmodverdir 1547crmodverdir: 1548 $(cmd_crmodverdir) 1549 1550PHONY += $(objtree)/Module.symvers 1551$(objtree)/Module.symvers: 1552 @test -e $(objtree)/Module.symvers || ( \ 1553 echo; \ 1554 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \ 1555 echo " is missing; modules will have no dependencies and modversions."; \ 1556 echo ) 1557 1558module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD)) 1559PHONY += $(module-dirs) modules 1560$(module-dirs): crmodverdir $(objtree)/Module.symvers 1561 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@) 1562 1563modules: $(module-dirs) 1564 @$(kecho) ' Building modules, stage 2.'; 1565 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1566 1567PHONY += modules_install 1568modules_install: _emodinst_ _emodinst_post 1569 1570install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra) 1571PHONY += _emodinst_ 1572_emodinst_: 1573 $(Q)mkdir -p $(MODLIB)/$(install-dir) 1574 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1575 1576PHONY += _emodinst_post 1577_emodinst_post: _emodinst_ 1578 $(call cmd,depmod) 1579 1580clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD)) 1581 1582PHONY += $(clean-dirs) clean 1583$(clean-dirs): 1584 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1585 1586clean: rm-dirs := $(MODVERDIR) 1587clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers 1588 1589PHONY += help 1590help: 1591 @echo ' Building external modules.' 1592 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1593 @echo '' 1594 @echo ' modules - default target, build the module(s)' 1595 @echo ' modules_install - install the module' 1596 @echo ' clean - remove generated files in module directory only' 1597 @echo '' 1598 1599# Dummies... 1600PHONY += prepare scripts 1601prepare: ; 1602scripts: ; 1603endif # KBUILD_EXTMOD 1604 1605clean: $(clean-dirs) 1606 $(call cmd,rmdirs) 1607 $(call cmd,rmfiles) 1608 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1609 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \ 1610 -o -name '*.ko.*' -o -name '*.dtb' -o -name '*.dtb.S' \ 1611 -o -name '*.dwo' -o -name '*.lst' \ 1612 -o -name '*.su' \ 1613 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1614 -o -name '*.symtypes' -o -name 'modules.order' \ 1615 -o -name modules.builtin -o -name '.tmp_*.o.*' \ 1616 -o -name .cache.mk \ 1617 -o -name '*.c.[012]*.*' \ 1618 -o -name '*.ll' \ 1619 -o -name '*.gcno' \) -type f -print | xargs rm -f 1620 1621# Generate tags for editors 1622# --------------------------------------------------------------------------- 1623quiet_cmd_tags = GEN $@ 1624 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@ 1625 1626tags TAGS cscope gtags: FORCE 1627 $(call cmd,tags) 1628 1629# Scripts to check various things for consistency 1630# --------------------------------------------------------------------------- 1631 1632PHONY += includecheck versioncheck coccicheck namespacecheck export_report 1633 1634includecheck: 1635 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1636 -name '*.[hcS]' -type f -print | sort \ 1637 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1638 1639versioncheck: 1640 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1641 -name '*.[hcS]' -type f -print | sort \ 1642 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1643 1644coccicheck: 1645 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@ 1646 1647namespacecheck: 1648 $(PERL) $(srctree)/scripts/namespace.pl 1649 1650export_report: 1651 $(PERL) $(srctree)/scripts/export_report.pl 1652 1653endif #ifeq ($(config-targets),1) 1654endif #ifeq ($(mixed-targets),1) 1655 1656PHONY += checkstack kernelrelease kernelversion image_name 1657 1658# UML needs a little special treatment here. It wants to use the host 1659# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1660# else wants $(ARCH), including people doing cross-builds, which means 1661# that $(SUBARCH) doesn't work here. 1662ifeq ($(ARCH), um) 1663CHECKSTACK_ARCH := $(SUBARCH) 1664else 1665CHECKSTACK_ARCH := $(ARCH) 1666endif 1667checkstack: 1668 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1669 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1670 1671kernelrelease: 1672 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1673 1674kernelversion: 1675 @echo $(KERNELVERSION) 1676 1677image_name: 1678 @echo $(KBUILD_IMAGE) 1679 1680# Clear a bunch of variables before executing the submake 1681tools/: FORCE 1682 $(Q)mkdir -p $(objtree)/tools 1683 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ 1684 1685tools/%: FORCE 1686 $(Q)mkdir -p $(objtree)/tools 1687 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $* 1688 1689# Single targets 1690# --------------------------------------------------------------------------- 1691# Single targets are compatible with: 1692# - build with mixed source and output 1693# - build with separate output dir 'make O=...' 1694# - external modules 1695# 1696# target-dir => where to store outputfile 1697# build-dir => directory in kernel source tree to use 1698 1699ifeq ($(KBUILD_EXTMOD),) 1700 build-dir = $(patsubst %/,%,$(dir $@)) 1701 target-dir = $(dir $@) 1702else 1703 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@))) 1704 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash)) 1705 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@)) 1706endif 1707 1708%.s: %.c prepare scripts FORCE 1709 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1710%.i: %.c prepare scripts FORCE 1711 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1712%.o: %.c prepare scripts FORCE 1713 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1714%.lst: %.c prepare scripts FORCE 1715 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1716%.s: %.S prepare scripts FORCE 1717 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1718%.o: %.S prepare scripts FORCE 1719 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1720%.symtypes: %.c prepare scripts FORCE 1721 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1722%.ll: %.c prepare scripts FORCE 1723 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1724 1725# Modules 1726/: prepare scripts FORCE 1727 $(cmd_crmodverdir) 1728 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1729 $(build)=$(build-dir) 1730# Make sure the latest headers are built for Documentation 1731Documentation/ samples/: headers_install 1732%/: prepare scripts FORCE 1733 $(cmd_crmodverdir) 1734 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1735 $(build)=$(build-dir) 1736%.ko: prepare scripts FORCE 1737 $(cmd_crmodverdir) 1738 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1739 $(build)=$(build-dir) $(@:.ko=.o) 1740 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1741 1742# FIXME Should go into a make.lib or something 1743# =========================================================================== 1744 1745quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs))) 1746 cmd_rmdirs = rm -rf $(rm-dirs) 1747 1748quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1749 cmd_rmfiles = rm -f $(rm-files) 1750 1751# Run depmod only if we have System.map and depmod is executable 1752quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) 1753 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1754 $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))" 1755 1756# Create temporary dir for module support files 1757# clean it up only when building all modules 1758cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \ 1759 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*) 1760 1761# read all saved command lines 1762 1763cmd_files := $(wildcard .*.cmd $(foreach f,$(sort $(targets)),$(dir $(f)).$(notdir $(f)).cmd)) 1764 1765ifneq ($(cmd_files),) 1766 $(cmd_files): ; # Do not try to update included dependency files 1767 include $(cmd_files) 1768endif 1769 1770endif # skip-makefile 1771 1772PHONY += FORCE 1773FORCE: 1774 1775# Declare the contents of the .PHONY variable as phony. We keep that 1776# information in a variable so we can use it in if_changed and friends. 1777.PHONY: $(PHONY) 1778