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