1# SPDX-License-Identifier: GPL-2.0 2VERSION = 4 3PATCHLEVEL = 14 4SUBLEVEL = 0 5EXTRAVERSION = -rc7 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/ ) 230 231# Cross compiling and selecting different set of gcc/bin-utils 232# --------------------------------------------------------------------------- 233# 234# When performing cross compilation for other architectures ARCH shall be set 235# to the target architecture. (See arch/* for the possibilities). 236# ARCH can be set during invocation of make: 237# make ARCH=ia64 238# Another way is to have ARCH set in the environment. 239# The default ARCH is the host where make is executed. 240 241# CROSS_COMPILE specify the prefix used for all executables used 242# during compilation. Only gcc and related bin-utils executables 243# are prefixed with $(CROSS_COMPILE). 244# CROSS_COMPILE can be set on the command line 245# make CROSS_COMPILE=ia64-linux- 246# Alternatively CROSS_COMPILE can be set in the environment. 247# A third alternative is to store a setting in .config so that plain 248# "make" in the configured kernel build directory always uses that. 249# Default value for CROSS_COMPILE is not to prefix executables 250# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 251ARCH ?= $(SUBARCH) 252CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%) 253 254# Architecture as present in compile.h 255UTS_MACHINE := $(ARCH) 256SRCARCH := $(ARCH) 257 258# Additional ARCH settings for x86 259ifeq ($(ARCH),i386) 260 SRCARCH := x86 261endif 262ifeq ($(ARCH),x86_64) 263 SRCARCH := x86 264endif 265 266# Additional ARCH settings for sparc 267ifeq ($(ARCH),sparc32) 268 SRCARCH := sparc 269endif 270ifeq ($(ARCH),sparc64) 271 SRCARCH := sparc 272endif 273 274# Additional ARCH settings for sh 275ifeq ($(ARCH),sh64) 276 SRCARCH := sh 277endif 278 279# Additional ARCH settings for tile 280ifeq ($(ARCH),tilepro) 281 SRCARCH := tile 282endif 283ifeq ($(ARCH),tilegx) 284 SRCARCH := tile 285endif 286 287# Where to locate arch specific headers 288hdr-arch := $(SRCARCH) 289 290KCONFIG_CONFIG ?= .config 291export KCONFIG_CONFIG 292 293# SHELL used by kbuild 294CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \ 295 else if [ -x /bin/bash ]; then echo /bin/bash; \ 296 else echo sh; fi ; fi) 297 298HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS) 299HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS) 300HOST_LFS_LIBS := $(shell getconf LFS_LIBS) 301 302HOSTCC = gcc 303HOSTCXX = g++ 304HOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \ 305 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) 306HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS) 307HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) 308HOST_LOADLIBES := $(HOST_LFS_LIBS) 309 310ifeq ($(shell $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1) 311HOSTCFLAGS += -Wno-unused-value -Wno-unused-parameter \ 312 -Wno-missing-field-initializers -fno-delete-null-pointer-checks 313endif 314 315# Decide whether to build built-in, modular, or both. 316# Normally, just do built-in. 317 318KBUILD_MODULES := 319KBUILD_BUILTIN := 1 320 321# If we have only "make modules", don't compile built-in objects. 322# When we're building modules with modversions, we need to consider 323# the built-in objects during the descend as well, in order to 324# make sure the checksums are up to date before we record them. 325 326ifeq ($(MAKECMDGOALS),modules) 327 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1) 328endif 329 330# If we have "make <whatever> modules", compile modules 331# in addition to whatever we do anyway. 332# Just "make" or "make all" shall build modules as well 333 334ifneq ($(filter all _all modules,$(MAKECMDGOALS)),) 335 KBUILD_MODULES := 1 336endif 337 338ifeq ($(MAKECMDGOALS),) 339 KBUILD_MODULES := 1 340endif 341 342export KBUILD_MODULES KBUILD_BUILTIN 343export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD 344 345# We need some generic definitions (do not try to remake the file). 346scripts/Kbuild.include: ; 347include scripts/Kbuild.include 348 349# Make variables (CC, etc...) 350AS = $(CROSS_COMPILE)as 351LD = $(CROSS_COMPILE)ld 352CC = $(CROSS_COMPILE)gcc 353CPP = $(CC) -E 354AR = $(CROSS_COMPILE)ar 355NM = $(CROSS_COMPILE)nm 356STRIP = $(CROSS_COMPILE)strip 357OBJCOPY = $(CROSS_COMPILE)objcopy 358OBJDUMP = $(CROSS_COMPILE)objdump 359AWK = awk 360GENKSYMS = scripts/genksyms/genksyms 361INSTALLKERNEL := installkernel 362DEPMOD = /sbin/depmod 363PERL = perl 364PYTHON = python 365CHECK = sparse 366 367CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 368 -Wbitwise -Wno-return-void $(CF) 369NOSTDINC_FLAGS = 370CFLAGS_MODULE = 371AFLAGS_MODULE = 372LDFLAGS_MODULE = 373CFLAGS_KERNEL = 374AFLAGS_KERNEL = 375LDFLAGS_vmlinux = 376CFLAGS_GCOV := -fprofile-arcs -ftest-coverage -fno-tree-loop-im $(call cc-disable-warning,maybe-uninitialized,) 377CFLAGS_KCOV := $(call cc-option,-fsanitize-coverage=trace-pc,) 378 379 380# Use USERINCLUDE when you must reference the UAPI directories only. 381USERINCLUDE := \ 382 -I$(srctree)/arch/$(hdr-arch)/include/uapi \ 383 -I$(objtree)/arch/$(hdr-arch)/include/generated/uapi \ 384 -I$(srctree)/include/uapi \ 385 -I$(objtree)/include/generated/uapi \ 386 -include $(srctree)/include/linux/kconfig.h 387 388# Use LINUXINCLUDE when you must reference the include/ directory. 389# Needed to be compatible with the O= option 390LINUXINCLUDE := \ 391 -I$(srctree)/arch/$(hdr-arch)/include \ 392 -I$(objtree)/arch/$(hdr-arch)/include/generated \ 393 $(if $(KBUILD_SRC), -I$(srctree)/include) \ 394 -I$(objtree)/include \ 395 $(USERINCLUDE) 396 397KBUILD_CPPFLAGS := -D__KERNEL__ 398 399KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \ 400 -fno-strict-aliasing -fno-common -fshort-wchar \ 401 -Werror-implicit-function-declaration \ 402 -Wno-format-security \ 403 -std=gnu89 $(call cc-option,-fno-PIE) 404 405 406KBUILD_AFLAGS_KERNEL := 407KBUILD_CFLAGS_KERNEL := 408KBUILD_AFLAGS := -D__ASSEMBLY__ $(call cc-option,-fno-PIE) 409KBUILD_AFLAGS_MODULE := -DMODULE 410KBUILD_CFLAGS_MODULE := -DMODULE 411KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds 412 413# Read KERNELRELEASE from include/config/kernel.release (if it exists) 414KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null) 415KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 416 417export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 418export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC 419export CPP AR NM STRIP OBJCOPY OBJDUMP HOSTLDFLAGS HOST_LOADLIBES 420export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE 421export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS 422 423export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS 424export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV CFLAGS_KCOV CFLAGS_KASAN CFLAGS_UBSAN 425export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 426export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 427export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 428export KBUILD_ARFLAGS 429 430# When compiling out-of-tree modules, put MODVERDIR in the module 431# tree rather than in the kernel tree. The kernel tree might 432# even be read-only. 433export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions 434 435# Files to ignore in find ... statements 436 437export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 438 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 439 -prune -o 440export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 441 --exclude CVS --exclude .pc --exclude .hg --exclude .git 442 443# =========================================================================== 444# Rules shared between *config targets and build targets 445 446# Basic helpers built in scripts/basic/ 447PHONY += scripts_basic 448scripts_basic: 449 $(Q)$(MAKE) $(build)=scripts/basic 450 $(Q)rm -f .tmp_quiet_recordmcount 451 452# To avoid any implicit rule to kick in, define an empty command. 453scripts/basic/%: scripts_basic ; 454 455PHONY += outputmakefile 456# outputmakefile generates a Makefile in the output directory, if using a 457# separate output directory. This allows convenient use of make in the 458# output directory. 459outputmakefile: 460ifneq ($(KBUILD_SRC),) 461 $(Q)ln -fsn $(srctree) source 462 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \ 463 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL) 464endif 465 466# Support for using generic headers in asm-generic 467PHONY += asm-generic uapi-asm-generic 468asm-generic: uapi-asm-generic 469 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \ 470 src=asm obj=arch/$(SRCARCH)/include/generated/asm 471uapi-asm-generic: 472 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \ 473 src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm 474 475# To make sure we do not include .config for any of the *config targets 476# catch them early, and hand them over to scripts/kconfig/Makefile 477# It is allowed to specify more targets when calling make, including 478# mixing *config targets and build targets. 479# For example 'make oldconfig all'. 480# Detect when mixed targets is specified, and make a second invocation 481# of make so .config is not included in this case either (for *config). 482 483version_h := include/generated/uapi/linux/version.h 484old_version_h := include/linux/version.h 485 486no-dot-config-targets := clean mrproper distclean \ 487 cscope gtags TAGS tags help% %docs check% coccicheck \ 488 $(version_h) headers_% archheaders archscripts \ 489 kernelversion %src-pkg 490 491config-targets := 0 492mixed-targets := 0 493dot-config := 1 494 495ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 496 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 497 dot-config := 0 498 endif 499endif 500 501ifeq ($(KBUILD_EXTMOD),) 502 ifneq ($(filter config %config,$(MAKECMDGOALS)),) 503 config-targets := 1 504 ifneq ($(words $(MAKECMDGOALS)),1) 505 mixed-targets := 1 506 endif 507 endif 508endif 509# install and modules_install need also be processed one by one 510ifneq ($(filter install,$(MAKECMDGOALS)),) 511 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 512 mixed-targets := 1 513 endif 514endif 515 516ifeq ($(mixed-targets),1) 517# =========================================================================== 518# We're called with mixed targets (*config and build targets). 519# Handle them one by one. 520 521PHONY += $(MAKECMDGOALS) __build_one_by_one 522 523$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one 524 @: 525 526__build_one_by_one: 527 $(Q)set -e; \ 528 for i in $(MAKECMDGOALS); do \ 529 $(MAKE) -f $(srctree)/Makefile $$i; \ 530 done 531 532else 533ifeq ($(config-targets),1) 534# =========================================================================== 535# *config targets only - make sure prerequisites are updated, and descend 536# in scripts/kconfig to make the *config target 537 538# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 539# KBUILD_DEFCONFIG may point out an alternative default configuration 540# used for 'make defconfig' 541include arch/$(SRCARCH)/Makefile 542export KBUILD_DEFCONFIG KBUILD_KCONFIG 543 544config: scripts_basic outputmakefile FORCE 545 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 546 547%config: scripts_basic outputmakefile FORCE 548 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 549 550else 551# =========================================================================== 552# Build targets only - this includes vmlinux, arch specific targets, clean 553# targets and others. In general all targets except *config targets. 554 555ifeq ($(KBUILD_EXTMOD),) 556# Additional helpers built in scripts/ 557# Carefully list dependencies so we do not try to build scripts twice 558# in parallel 559PHONY += scripts 560scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \ 561 asm-generic gcc-plugins 562 $(Q)$(MAKE) $(build)=$(@) 563 564# Objects we will link into vmlinux / subdirs we need to visit 565init-y := init/ 566drivers-y := drivers/ sound/ firmware/ 567net-y := net/ 568libs-y := lib/ 569core-y := usr/ 570virt-y := virt/ 571endif # KBUILD_EXTMOD 572 573ifeq ($(dot-config),1) 574# Read in config 575-include include/config/auto.conf 576 577ifeq ($(KBUILD_EXTMOD),) 578# Read in dependencies to all Kconfig* files, make sure to run 579# oldconfig if changes are detected. 580-include include/config/auto.conf.cmd 581 582# To avoid any implicit rule to kick in, define an empty command 583$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ; 584 585# If .config is newer than include/config/auto.conf, someone tinkered 586# with it and forgot to run make oldconfig. 587# if auto.conf.cmd is missing then we are probably in a cleaned tree so 588# we execute the config step to be sure to catch updated Kconfig files 589include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd 590 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig 591else 592# external modules needs include/generated/autoconf.h and include/config/auto.conf 593# but do not care if they are up-to-date. Use auto.conf to trigger the test 594PHONY += include/config/auto.conf 595 596include/config/auto.conf: 597 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 598 echo >&2; \ 599 echo >&2 " ERROR: Kernel configuration is invalid."; \ 600 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 601 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 602 echo >&2 ; \ 603 /bin/false) 604 605endif # KBUILD_EXTMOD 606 607else 608# Dummy target needed, because used as prerequisite 609include/config/auto.conf: ; 610endif # $(dot-config) 611 612# For the kernel to actually contain only the needed exported symbols, 613# we have to build modules as well to determine what those symbols are. 614# (this can be evaluated only once include/config/auto.conf has been included) 615ifdef CONFIG_TRIM_UNUSED_KSYMS 616 KBUILD_MODULES := 1 617endif 618 619# The all: target is the default when no target is given on the 620# command line. 621# This allow a user to issue only 'make' to build a kernel including modules 622# Defaults to vmlinux, but the arch makefile usually adds further targets 623all: vmlinux 624 625# The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default 626# values of the respective KBUILD_* variables 627ARCH_CPPFLAGS := 628ARCH_AFLAGS := 629ARCH_CFLAGS := 630include arch/$(SRCARCH)/Makefile 631 632KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,) 633KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) 634KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) 635KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) 636KBUILD_CFLAGS += $(call cc-disable-warning, int-in-bool-context) 637 638ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 639KBUILD_CFLAGS += $(call cc-option,-Oz,-Os) 640KBUILD_CFLAGS += $(call cc-disable-warning,maybe-uninitialized,) 641else 642ifdef CONFIG_PROFILE_ALL_BRANCHES 643KBUILD_CFLAGS += -O2 $(call cc-disable-warning,maybe-uninitialized,) 644else 645KBUILD_CFLAGS += -O2 646endif 647endif 648 649KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \ 650 $(call cc-disable-warning,maybe-uninitialized,)) 651 652# Tell gcc to never replace conditional load with a non-conditional one 653KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 654 655# check for 'asm goto' 656ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y) 657 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO 658 KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO 659endif 660 661include scripts/Makefile.gcc-plugins 662 663ifdef CONFIG_READABLE_ASM 664# Disable optimizations that make assembler listings hard to read. 665# reorder blocks reorders the control in the function 666# ipa clone creates specialized cloned functions 667# partial inlining inlines only parts of functions 668KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \ 669 $(call cc-option,-fno-ipa-cp-clone,) \ 670 $(call cc-option,-fno-partial-inlining) 671endif 672 673ifneq ($(CONFIG_FRAME_WARN),0) 674KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN}) 675endif 676 677# This selects the stack protector compiler flag. Testing it is delayed 678# until after .config has been reprocessed, in the prepare-compiler-check 679# target. 680ifdef CONFIG_CC_STACKPROTECTOR_REGULAR 681 stackp-flag := -fstack-protector 682 stackp-name := REGULAR 683else 684ifdef CONFIG_CC_STACKPROTECTOR_STRONG 685 stackp-flag := -fstack-protector-strong 686 stackp-name := STRONG 687else 688 # Force off for distro compilers that enable stack protector by default. 689 stackp-flag := $(call cc-option, -fno-stack-protector) 690endif 691endif 692# Find arch-specific stack protector compiler sanity-checking script. 693ifdef CONFIG_CC_STACKPROTECTOR 694 stackp-path := $(srctree)/scripts/gcc-$(SRCARCH)_$(BITS)-has-stack-protector.sh 695 stackp-check := $(wildcard $(stackp-path)) 696endif 697KBUILD_CFLAGS += $(stackp-flag) 698 699ifeq ($(cc-name),clang) 700ifneq ($(CROSS_COMPILE),) 701CLANG_TARGET := --target=$(notdir $(CROSS_COMPILE:%-=%)) 702GCC_TOOLCHAIN := $(realpath $(dir $(shell which $(LD)))/..) 703endif 704ifneq ($(GCC_TOOLCHAIN),) 705CLANG_GCC_TC := --gcc-toolchain=$(GCC_TOOLCHAIN) 706endif 707KBUILD_CFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC) 708KBUILD_AFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC) 709KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,) 710KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable) 711KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier) 712KBUILD_CFLAGS += $(call cc-disable-warning, gnu) 713KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) 714# Quiet clang warning: comparison of unsigned expression < 0 is always false 715KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare) 716# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the 717# source of a reference will be _MergedGlobals and not on of the whitelisted names. 718# See modpost pattern 2 719KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,) 720KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior) 721KBUILD_CFLAGS += $(call cc-option, -no-integrated-as) 722KBUILD_AFLAGS += $(call cc-option, -no-integrated-as) 723else 724 725# These warnings generated too much noise in a regular build. 726# Use make W=1 to enable them (see scripts/Makefile.extrawarn) 727KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable) 728KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) 729endif 730 731ifdef CONFIG_FRAME_POINTER 732KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 733else 734# Some targets (ARM with Thumb2, for example), can't be built with frame 735# pointers. For those, we don't have FUNCTION_TRACER automatically 736# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 737# incompatible with -fomit-frame-pointer with current GCC, so we don't use 738# -fomit-frame-pointer with FUNCTION_TRACER. 739ifndef CONFIG_FUNCTION_TRACER 740KBUILD_CFLAGS += -fomit-frame-pointer 741endif 742endif 743 744KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments) 745 746ifdef CONFIG_DEBUG_INFO 747ifdef CONFIG_DEBUG_INFO_SPLIT 748KBUILD_CFLAGS += $(call cc-option, -gsplit-dwarf, -g) 749else 750KBUILD_CFLAGS += -g 751endif 752KBUILD_AFLAGS += -Wa,-gdwarf-2 753endif 754ifdef CONFIG_DEBUG_INFO_DWARF4 755KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,) 756endif 757 758ifdef CONFIG_DEBUG_INFO_REDUCED 759KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \ 760 $(call cc-option,-fno-var-tracking) 761endif 762 763ifdef CONFIG_FUNCTION_TRACER 764ifndef CC_FLAGS_FTRACE 765CC_FLAGS_FTRACE := -pg 766endif 767export CC_FLAGS_FTRACE 768ifdef CONFIG_HAVE_FENTRY 769CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY) 770endif 771KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY) 772KBUILD_AFLAGS += $(CC_USING_FENTRY) 773ifdef CONFIG_DYNAMIC_FTRACE 774 ifdef CONFIG_HAVE_C_RECORDMCOUNT 775 BUILD_C_RECORDMCOUNT := y 776 export BUILD_C_RECORDMCOUNT 777 endif 778endif 779endif 780 781# We trigger additional mismatches with less inlining 782ifdef CONFIG_DEBUG_SECTION_MISMATCH 783KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) 784endif 785 786ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 787KBUILD_CFLAGS += $(call cc-option,-ffunction-sections,) 788KBUILD_CFLAGS += $(call cc-option,-fdata-sections,) 789endif 790 791# arch Makefile may override CC so keep this after arch Makefile is included 792NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) 793CHECKFLAGS += $(NOSTDINC_FLAGS) 794 795# warn about C99 declaration after statement 796KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,) 797 798# disable pointer signed / unsigned warnings in gcc 4.0 799KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign) 800 801# disable invalid "can't wrap" optimizations for signed / pointers 802KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow) 803 804# conserve stack if available 805KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) 806 807# disallow errors like 'EXPORT_GPL(foo);' with missing header 808KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int) 809 810# require functions to have arguments in prototypes, not empty 'int foo()' 811KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes) 812 813# Prohibit date/time macros, which would make the build non-deterministic 814KBUILD_CFLAGS += $(call cc-option,-Werror=date-time) 815 816# enforce correct pointer usage 817KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 818 819# Require designated initializers for all marked structures 820KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) 821 822# use the deterministic mode of AR if available 823KBUILD_ARFLAGS := $(call ar-option,D) 824 825include scripts/Makefile.kasan 826include scripts/Makefile.extrawarn 827include scripts/Makefile.ubsan 828 829# Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the 830# last assignments 831KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS) 832KBUILD_AFLAGS += $(ARCH_AFLAGS) $(KAFLAGS) 833KBUILD_CFLAGS += $(ARCH_CFLAGS) $(KCFLAGS) 834 835# Use --build-id when available. 836LDFLAGS_BUILD_ID := $(patsubst -Wl$(comma)%,%,\ 837 $(call cc-ldoption, -Wl$(comma)--build-id,)) 838KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID) 839LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID) 840 841ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 842LDFLAGS_vmlinux += $(call ld-option, --gc-sections,) 843endif 844 845ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 846LDFLAGS_vmlinux += $(call ld-option, -X,) 847endif 848 849# Default kernel image to build when no specific target is given. 850# KBUILD_IMAGE may be overruled on the command line or 851# set in the environment 852# Also any assignments in arch/$(ARCH)/Makefile take precedence over 853# this default value 854export KBUILD_IMAGE ?= vmlinux 855 856# 857# INSTALL_PATH specifies where to place the updated kernel and system map 858# images. Default is /boot, but you can set it to other values 859export INSTALL_PATH ?= /boot 860 861# 862# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 863# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 864# an argument if needed. Otherwise it defaults to the kernel install path 865# 866export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 867 868# 869# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 870# relocations required by build roots. This is not defined in the 871# makefile but the argument can be passed to make if needed. 872# 873 874MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 875export MODLIB 876 877# 878# INSTALL_MOD_STRIP, if defined, will cause modules to be 879# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then 880# the default option --strip-debug will be used. Otherwise, 881# INSTALL_MOD_STRIP value will be used as the options to the strip command. 882 883ifdef INSTALL_MOD_STRIP 884ifeq ($(INSTALL_MOD_STRIP),1) 885mod_strip_cmd = $(STRIP) --strip-debug 886else 887mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP) 888endif # INSTALL_MOD_STRIP=1 889else 890mod_strip_cmd = true 891endif # INSTALL_MOD_STRIP 892export mod_strip_cmd 893 894# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed 895# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP 896# or CONFIG_MODULE_COMPRESS_XZ. 897 898mod_compress_cmd = true 899ifdef CONFIG_MODULE_COMPRESS 900 ifdef CONFIG_MODULE_COMPRESS_GZIP 901 mod_compress_cmd = gzip -n -f 902 endif # CONFIG_MODULE_COMPRESS_GZIP 903 ifdef CONFIG_MODULE_COMPRESS_XZ 904 mod_compress_cmd = xz -f 905 endif # CONFIG_MODULE_COMPRESS_XZ 906endif # CONFIG_MODULE_COMPRESS 907export mod_compress_cmd 908 909# Select initial ramdisk compression format, default is gzip(1). 910# This shall be used by the dracut(8) tool while creating an initramfs image. 911# 912INITRD_COMPRESS-y := gzip 913INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2 914INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma 915INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz 916INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo 917INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4 918# do not export INITRD_COMPRESS, since we didn't actually 919# choose a sane default compression above. 920# export INITRD_COMPRESS := $(INITRD_COMPRESS-y) 921 922ifdef CONFIG_MODULE_SIG_ALL 923$(eval $(call config_filename,MODULE_SIG_KEY)) 924 925mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509 926else 927mod_sign_cmd = true 928endif 929export mod_sign_cmd 930 931ifdef CONFIG_STACK_VALIDATION 932 has_libelf := $(call try-run,\ 933 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0) 934 ifeq ($(has_libelf),1) 935 objtool_target := tools/objtool FORCE 936 else 937 ifdef CONFIG_ORC_UNWINDER 938 $(error "Cannot generate ORC metadata for CONFIG_ORC_UNWINDER=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel") 939 else 940 $(warning "Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel") 941 endif 942 SKIP_STACK_VALIDATION := 1 943 export SKIP_STACK_VALIDATION 944 endif 945endif 946 947 948ifeq ($(KBUILD_EXTMOD),) 949core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/ 950 951vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \ 952 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 953 $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y))) 954 955vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \ 956 $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-)))) 957 958init-y := $(patsubst %/, %/built-in.o, $(init-y)) 959core-y := $(patsubst %/, %/built-in.o, $(core-y)) 960drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y)) 961net-y := $(patsubst %/, %/built-in.o, $(net-y)) 962libs-y1 := $(patsubst %/, %/lib.a, $(libs-y)) 963libs-y2 := $(filter-out %.a, $(patsubst %/, %/built-in.o, $(libs-y))) 964virt-y := $(patsubst %/, %/built-in.o, $(virt-y)) 965 966# Externally visible symbols (used by link-vmlinux.sh) 967export KBUILD_VMLINUX_INIT := $(head-y) $(init-y) 968export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y2) $(drivers-y) $(net-y) $(virt-y) 969export KBUILD_VMLINUX_LIBS := $(libs-y1) 970export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 971export LDFLAGS_vmlinux 972# used by scripts/package/Makefile 973export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools) 974 975vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) $(KBUILD_VMLINUX_LIBS) 976 977# Include targets which we want to execute sequentially if the rest of the 978# kernel build went well. If CONFIG_TRIM_UNUSED_KSYMS is set, this might be 979# evaluated more than once. 980PHONY += vmlinux_prereq 981vmlinux_prereq: $(vmlinux-deps) FORCE 982ifdef CONFIG_HEADERS_CHECK 983 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check 984endif 985ifdef CONFIG_GDB_SCRIPTS 986 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 987endif 988ifdef CONFIG_TRIM_UNUSED_KSYMS 989 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ 990 "$(MAKE) -f $(srctree)/Makefile vmlinux" 991endif 992 993# standalone target for easier testing 994include/generated/autoksyms.h: FORCE 995 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh true 996 997ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink) 998 999# Final link of vmlinux with optional arch pass after final link 1000cmd_link-vmlinux = \ 1001 $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) ; \ 1002 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) 1003 1004vmlinux: scripts/link-vmlinux.sh vmlinux_prereq $(vmlinux-deps) FORCE 1005 +$(call if_changed,link-vmlinux) 1006 1007# Build samples along the rest of the kernel 1008ifdef CONFIG_SAMPLES 1009vmlinux-dirs += samples 1010endif 1011 1012# The actual objects are generated when descending, 1013# make sure no implicit rule kicks in 1014$(sort $(vmlinux-deps)): $(vmlinux-dirs) ; 1015 1016# Handle descending into subdirectories listed in $(vmlinux-dirs) 1017# Preset locale variables to speed up the build process. Limit locale 1018# tweaks to this spot to avoid wrong language settings when running 1019# make menuconfig etc. 1020# Error messages still appears in the original language 1021 1022PHONY += $(vmlinux-dirs) 1023$(vmlinux-dirs): prepare scripts 1024 $(Q)$(MAKE) $(build)=$@ 1025 1026define filechk_kernel.release 1027 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1028endef 1029 1030# Store (new) KERNELRELEASE string in include/config/kernel.release 1031include/config/kernel.release: include/config/auto.conf FORCE 1032 $(call filechk,kernel.release) 1033 1034 1035# Things we need to do before we recursively start building the kernel 1036# or the modules are listed in "prepare". 1037# A multi level approach is used. prepareN is processed before prepareN-1. 1038# archprepare is used in arch Makefiles and when processed asm symlink, 1039# version.h and scripts_basic is processed / created. 1040 1041# Listed in dependency order 1042PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3 1043 1044# prepare3 is used to check if we are building in a separate output directory, 1045# and if so do: 1046# 1) Check that make has not been executed in the kernel src $(srctree) 1047prepare3: include/config/kernel.release 1048ifneq ($(KBUILD_SRC),) 1049 @$(kecho) ' Using $(srctree) as source for kernel' 1050 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \ 1051 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \ 1052 echo >&2 " in the '$(srctree)' directory.";\ 1053 /bin/false; \ 1054 fi; 1055endif 1056 1057# prepare2 creates a makefile if using a separate output directory. 1058# From this point forward, .config has been reprocessed, so any rules 1059# that need to depend on updated CONFIG_* values can be checked here. 1060prepare2: prepare3 prepare-compiler-check outputmakefile asm-generic 1061 1062prepare1: prepare2 $(version_h) include/generated/utsrelease.h \ 1063 include/config/auto.conf 1064 $(cmd_crmodverdir) 1065 1066archprepare: archheaders archscripts prepare1 scripts_basic 1067 1068prepare0: archprepare gcc-plugins 1069 $(Q)$(MAKE) $(build)=. 1070 1071# All the preparing.. 1072prepare: prepare0 prepare-objtool 1073 1074PHONY += prepare-objtool 1075prepare-objtool: $(objtool_target) 1076 1077# Check for CONFIG flags that require compiler support. Abort the build 1078# after .config has been processed, but before the kernel build starts. 1079# 1080# For security-sensitive CONFIG options, we don't want to fallback and/or 1081# silently change which compiler flags will be used, since that leads to 1082# producing kernels with different security feature characteristics 1083# depending on the compiler used. (For example, "But I selected 1084# CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!") 1085PHONY += prepare-compiler-check 1086prepare-compiler-check: FORCE 1087# Make sure compiler supports requested stack protector flag. 1088ifdef stackp-name 1089 ifeq ($(call cc-option, $(stackp-flag)),) 1090 @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \ 1091 $(stackp-flag) not supported by compiler >&2 && exit 1 1092 endif 1093endif 1094# Make sure compiler does not have buggy stack-protector support. 1095ifdef stackp-check 1096 ifneq ($(shell $(CONFIG_SHELL) $(stackp-check) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y) 1097 @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \ 1098 $(stackp-flag) available but compiler is broken >&2 && exit 1 1099 endif 1100endif 1101 @: 1102 1103# Generate some files 1104# --------------------------------------------------------------------------- 1105 1106# KERNELRELEASE can change from a few different places, meaning version.h 1107# needs to be updated, so this check is forced on all builds 1108 1109uts_len := 64 1110define filechk_utsrelease.h 1111 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1112 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1113 exit 1; \ 1114 fi; \ 1115 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";) 1116endef 1117 1118define filechk_version.h 1119 (echo \#define LINUX_VERSION_CODE $(shell \ 1120 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \ 1121 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';) 1122endef 1123 1124$(version_h): $(srctree)/Makefile FORCE 1125 $(call filechk,version.h) 1126 $(Q)rm -f $(old_version_h) 1127 1128include/generated/utsrelease.h: include/config/kernel.release FORCE 1129 $(call filechk,utsrelease.h) 1130 1131PHONY += headerdep 1132headerdep: 1133 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1134 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1135 1136# --------------------------------------------------------------------------- 1137# Kernel headers 1138 1139#Default location for installed headers 1140export INSTALL_HDR_PATH = $(objtree)/usr 1141 1142# If we do an all arch process set dst to include/arch-$(hdr-arch) 1143hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(hdr-arch), dst=include) 1144 1145PHONY += archheaders 1146archheaders: 1147 1148PHONY += archscripts 1149archscripts: 1150 1151PHONY += __headers 1152__headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts 1153 $(Q)$(MAKE) $(build)=scripts build_unifdef 1154 1155PHONY += headers_install_all 1156headers_install_all: 1157 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install 1158 1159PHONY += headers_install 1160headers_install: __headers 1161 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \ 1162 $(error Headers not exportable for the $(SRCARCH) architecture)) 1163 $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include 1164 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi $(hdr-dst) 1165 1166PHONY += headers_check_all 1167headers_check_all: headers_install_all 1168 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check 1169 1170PHONY += headers_check 1171headers_check: headers_install 1172 $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1 1173 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi $(hdr-dst) HDRCHECK=1 1174 1175# --------------------------------------------------------------------------- 1176# Kernel selftest 1177 1178PHONY += kselftest 1179kselftest: 1180 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1181 1182PHONY += kselftest-clean 1183kselftest-clean: 1184 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean 1185 1186PHONY += kselftest-merge 1187kselftest-merge: 1188 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1189 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \ 1190 -m $(objtree)/.config \ 1191 $(srctree)/tools/testing/selftests/*/config 1192 +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1193 1194# --------------------------------------------------------------------------- 1195# Modules 1196 1197ifdef CONFIG_MODULES 1198 1199# By default, build modules as well 1200 1201all: modules 1202 1203# Build modules 1204# 1205# A module can be listed more than once in obj-m resulting in 1206# duplicate lines in modules.order files. Those are removed 1207# using awk while concatenating to the final file. 1208 1209PHONY += modules 1210modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin 1211 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order 1212 @$(kecho) ' Building modules, stage 2.'; 1213 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1214 1215modules.builtin: $(vmlinux-dirs:%=%/modules.builtin) 1216 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin 1217 1218%/modules.builtin: include/config/auto.conf 1219 $(Q)$(MAKE) $(modbuiltin)=$* 1220 1221 1222# Target to prepare building external modules 1223PHONY += modules_prepare 1224modules_prepare: prepare scripts 1225 1226# Target to install modules 1227PHONY += modules_install 1228modules_install: _modinst_ _modinst_post 1229 1230PHONY += _modinst_ 1231_modinst_: 1232 @rm -rf $(MODLIB)/kernel 1233 @rm -f $(MODLIB)/source 1234 @mkdir -p $(MODLIB)/kernel 1235 @ln -s $(abspath $(srctree)) $(MODLIB)/source 1236 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1237 rm -f $(MODLIB)/build ; \ 1238 ln -s $(CURDIR) $(MODLIB)/build ; \ 1239 fi 1240 @cp -f $(objtree)/modules.order $(MODLIB)/ 1241 @cp -f $(objtree)/modules.builtin $(MODLIB)/ 1242 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1243 1244# This depmod is only for convenience to give the initial 1245# boot a modules.dep even before / is mounted read-write. However the 1246# boot script depmod is the master version. 1247PHONY += _modinst_post 1248_modinst_post: _modinst_ 1249 $(call cmd,depmod) 1250 1251ifeq ($(CONFIG_MODULE_SIG), y) 1252PHONY += modules_sign 1253modules_sign: 1254 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign 1255endif 1256 1257else # CONFIG_MODULES 1258 1259# Modules not configured 1260# --------------------------------------------------------------------------- 1261 1262PHONY += modules modules_install 1263modules modules_install: 1264 @echo >&2 1265 @echo >&2 "The present kernel configuration has modules disabled." 1266 @echo >&2 "Type 'make config' and enable loadable module support." 1267 @echo >&2 "Then build a kernel with module support enabled." 1268 @echo >&2 1269 @exit 1 1270 1271endif # CONFIG_MODULES 1272 1273### 1274# Cleaning is done on three levels. 1275# make clean Delete most generated files 1276# Leave enough to build external modules 1277# make mrproper Delete the current configuration, and all generated files 1278# make distclean Remove editor backup files, patch leftover files and the like 1279 1280# Directories & files removed with 'make clean' 1281CLEAN_DIRS += $(MODVERDIR) 1282 1283# Directories & files removed with 'make mrproper' 1284MRPROPER_DIRS += include/config usr/include include/generated \ 1285 arch/*/include/generated .tmp_objdiff 1286MRPROPER_FILES += .config .config.old .version .old_version \ 1287 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \ 1288 signing_key.pem signing_key.priv signing_key.x509 \ 1289 x509.genkey extra_certificates signing_key.x509.keyid \ 1290 signing_key.x509.signer vmlinux-gdb.py 1291 1292# clean - Delete most, but leave enough to build external modules 1293# 1294clean: rm-dirs := $(CLEAN_DIRS) 1295clean: rm-files := $(CLEAN_FILES) 1296clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples) 1297 1298PHONY += $(clean-dirs) clean archclean vmlinuxclean 1299$(clean-dirs): 1300 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1301 1302vmlinuxclean: 1303 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1304 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1305 1306clean: archclean vmlinuxclean 1307 1308# mrproper - Delete all generated files, including .config 1309# 1310mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS)) 1311mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1312mrproper-dirs := $(addprefix _mrproper_,scripts) 1313 1314PHONY += $(mrproper-dirs) mrproper archmrproper 1315$(mrproper-dirs): 1316 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1317 1318mrproper: clean archmrproper $(mrproper-dirs) 1319 $(call cmd,rmdirs) 1320 $(call cmd,rmfiles) 1321 1322# distclean 1323# 1324PHONY += distclean 1325 1326distclean: mrproper 1327 @find $(srctree) $(RCS_FIND_IGNORE) \ 1328 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1329 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1330 -o -name 'core' \) \ 1331 -type f -print | xargs rm -f 1332 1333 1334# Packaging of the kernel to various formats 1335# --------------------------------------------------------------------------- 1336# rpm target kept for backward compatibility 1337package-dir := scripts/package 1338 1339%src-pkg: FORCE 1340 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1341%pkg: include/config/kernel.release FORCE 1342 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1343rpm: include/config/kernel.release FORCE 1344 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1345 1346 1347# Brief documentation of the typical targets used 1348# --------------------------------------------------------------------------- 1349 1350boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1351boards := $(sort $(notdir $(boards))) 1352board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1353board-dirs := $(sort $(notdir $(board-dirs:/=))) 1354 1355PHONY += help 1356help: 1357 @echo 'Cleaning targets:' 1358 @echo ' clean - Remove most generated files but keep the config and' 1359 @echo ' enough build support to build external modules' 1360 @echo ' mrproper - Remove all generated files + config + various backup files' 1361 @echo ' distclean - mrproper + remove editor backup and patch files' 1362 @echo '' 1363 @echo 'Configuration targets:' 1364 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1365 @echo '' 1366 @echo 'Other generic targets:' 1367 @echo ' all - Build all targets marked with [*]' 1368 @echo '* vmlinux - Build the bare kernel' 1369 @echo '* modules - Build all modules' 1370 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1371 @echo ' dir/ - Build all files in dir and below' 1372 @echo ' dir/file.[ois] - Build specified target only' 1373 @echo ' dir/file.ll - Build the LLVM assembly file' 1374 @echo ' (requires compiler support for LLVM assembly generation)' 1375 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1376 @echo ' (requires a recent binutils and recent build (System.map))' 1377 @echo ' dir/file.ko - Build module including final link' 1378 @echo ' modules_prepare - Set up for building external modules' 1379 @echo ' tags/TAGS - Generate tags file for editors' 1380 @echo ' cscope - Generate cscope index' 1381 @echo ' gtags - Generate GNU GLOBAL index' 1382 @echo ' kernelrelease - Output the release version string (use with make -s)' 1383 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1384 @echo ' image_name - Output the image name (use with make -s)' 1385 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1386 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1387 echo '' 1388 @echo 'Static analysers:' 1389 @echo ' checkstack - Generate a list of stack hogs' 1390 @echo ' namespacecheck - Name space analysis on compiled kernel' 1391 @echo ' versioncheck - Sanity check on version.h usage' 1392 @echo ' includecheck - Check for duplicate included header files' 1393 @echo ' export_report - List the usages of all exported symbols' 1394 @echo ' headers_check - Sanity check on exported headers' 1395 @echo ' headerdep - Detect inclusion cycles in headers' 1396 @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help 1397 @echo '' 1398 @echo 'Kernel selftest:' 1399 @echo ' kselftest - Build and run kernel selftest (run as root)' 1400 @echo ' Build, install, and boot kernel before' 1401 @echo ' running kselftest on it' 1402 @echo ' kselftest-clean - Remove all generated kselftest files' 1403 @echo ' kselftest-merge - Merge all the config dependencies of kselftest to existing' 1404 @echo ' .config.' 1405 @echo '' 1406 @echo 'Userspace tools targets:' 1407 @echo ' use "make tools/help"' 1408 @echo ' or "cd tools; make help"' 1409 @echo '' 1410 @echo 'Kernel packaging:' 1411 @$(MAKE) $(build)=$(package-dir) help 1412 @echo '' 1413 @echo 'Documentation targets:' 1414 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1415 @echo '' 1416 @echo 'Architecture specific targets ($(SRCARCH)):' 1417 @$(if $(archhelp),$(archhelp),\ 1418 echo ' No architecture specific help defined for $(SRCARCH)') 1419 @echo '' 1420 @$(if $(boards), \ 1421 $(foreach b, $(boards), \ 1422 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1423 echo '') 1424 @$(if $(board-dirs), \ 1425 $(foreach b, $(board-dirs), \ 1426 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1427 printf " %-16s - Show all of the above\\n" help-boards; \ 1428 echo '') 1429 1430 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1431 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1432 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1433 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK (sparse by default)' 1434 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1435 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1436 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where' 1437 @echo ' 1: warnings which may be relevant and do not occur too often' 1438 @echo ' 2: warnings which occur quite often but may still be relevant' 1439 @echo ' 3: more obscure warnings, can most likely be ignored' 1440 @echo ' Multiple levels can be combined with W=12 or W=123' 1441 @echo '' 1442 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1443 @echo 'For further info see the ./README file' 1444 1445 1446help-board-dirs := $(addprefix help-,$(board-dirs)) 1447 1448help-boards: $(help-board-dirs) 1449 1450boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1451 1452$(help-board-dirs): help-%: 1453 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1454 @$(if $(boards-per-dir), \ 1455 $(foreach b, $(boards-per-dir), \ 1456 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1457 echo '') 1458 1459 1460# Documentation targets 1461# --------------------------------------------------------------------------- 1462DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs linkcheckdocs 1463PHONY += $(DOC_TARGETS) 1464$(DOC_TARGETS): scripts_basic FORCE 1465 $(Q)$(MAKE) $(build)=Documentation $@ 1466 1467else # KBUILD_EXTMOD 1468 1469### 1470# External module support. 1471# When building external modules the kernel used as basis is considered 1472# read-only, and no consistency checks are made and the make 1473# system is not used on the basis kernel. If updates are required 1474# in the basis kernel ordinary make commands (without M=...) must 1475# be used. 1476# 1477# The following are the only valid targets when building external 1478# modules. 1479# make M=dir clean Delete all automatically generated files 1480# make M=dir modules Make all modules in specified dir 1481# make M=dir Same as 'make M=dir modules' 1482# make M=dir modules_install 1483# Install the modules built in the module directory 1484# Assumes install directory is already created 1485 1486# We are always building modules 1487KBUILD_MODULES := 1 1488PHONY += crmodverdir 1489crmodverdir: 1490 $(cmd_crmodverdir) 1491 1492PHONY += $(objtree)/Module.symvers 1493$(objtree)/Module.symvers: 1494 @test -e $(objtree)/Module.symvers || ( \ 1495 echo; \ 1496 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \ 1497 echo " is missing; modules will have no dependencies and modversions."; \ 1498 echo ) 1499 1500module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD)) 1501PHONY += $(module-dirs) modules 1502$(module-dirs): crmodverdir $(objtree)/Module.symvers 1503 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@) 1504 1505modules: $(module-dirs) 1506 @$(kecho) ' Building modules, stage 2.'; 1507 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1508 1509PHONY += modules_install 1510modules_install: _emodinst_ _emodinst_post 1511 1512install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra) 1513PHONY += _emodinst_ 1514_emodinst_: 1515 $(Q)mkdir -p $(MODLIB)/$(install-dir) 1516 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1517 1518PHONY += _emodinst_post 1519_emodinst_post: _emodinst_ 1520 $(call cmd,depmod) 1521 1522clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD)) 1523 1524PHONY += $(clean-dirs) clean 1525$(clean-dirs): 1526 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1527 1528clean: rm-dirs := $(MODVERDIR) 1529clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers 1530 1531PHONY += help 1532help: 1533 @echo ' Building external modules.' 1534 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1535 @echo '' 1536 @echo ' modules - default target, build the module(s)' 1537 @echo ' modules_install - install the module' 1538 @echo ' clean - remove generated files in module directory only' 1539 @echo '' 1540 1541# Dummies... 1542PHONY += prepare scripts 1543prepare: ; 1544scripts: ; 1545endif # KBUILD_EXTMOD 1546 1547clean: $(clean-dirs) 1548 $(call cmd,rmdirs) 1549 $(call cmd,rmfiles) 1550 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1551 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \ 1552 -o -name '*.ko.*' \ 1553 -o -name '*.dwo' \ 1554 -o -name '*.su' \ 1555 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1556 -o -name '*.symtypes' -o -name 'modules.order' \ 1557 -o -name modules.builtin -o -name '.tmp_*.o.*' \ 1558 -o -name '*.c.[012]*.*' \ 1559 -o -name '*.ll' \ 1560 -o -name '*.gcno' \) -type f -print | xargs rm -f 1561 1562# Generate tags for editors 1563# --------------------------------------------------------------------------- 1564quiet_cmd_tags = GEN $@ 1565 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@ 1566 1567tags TAGS cscope gtags: FORCE 1568 $(call cmd,tags) 1569 1570# Scripts to check various things for consistency 1571# --------------------------------------------------------------------------- 1572 1573PHONY += includecheck versioncheck coccicheck namespacecheck export_report 1574 1575includecheck: 1576 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1577 -name '*.[hcS]' -type f -print | sort \ 1578 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1579 1580versioncheck: 1581 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1582 -name '*.[hcS]' -type f -print | sort \ 1583 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1584 1585coccicheck: 1586 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@ 1587 1588namespacecheck: 1589 $(PERL) $(srctree)/scripts/namespace.pl 1590 1591export_report: 1592 $(PERL) $(srctree)/scripts/export_report.pl 1593 1594endif #ifeq ($(config-targets),1) 1595endif #ifeq ($(mixed-targets),1) 1596 1597PHONY += checkstack kernelrelease kernelversion image_name 1598 1599# UML needs a little special treatment here. It wants to use the host 1600# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1601# else wants $(ARCH), including people doing cross-builds, which means 1602# that $(SUBARCH) doesn't work here. 1603ifeq ($(ARCH), um) 1604CHECKSTACK_ARCH := $(SUBARCH) 1605else 1606CHECKSTACK_ARCH := $(ARCH) 1607endif 1608checkstack: 1609 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1610 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1611 1612kernelrelease: 1613 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1614 1615kernelversion: 1616 @echo $(KERNELVERSION) 1617 1618image_name: 1619 @echo $(KBUILD_IMAGE) 1620 1621# Clear a bunch of variables before executing the submake 1622tools/: FORCE 1623 $(Q)mkdir -p $(objtree)/tools 1624 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ 1625 1626tools/%: FORCE 1627 $(Q)mkdir -p $(objtree)/tools 1628 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $* 1629 1630# Single targets 1631# --------------------------------------------------------------------------- 1632# Single targets are compatible with: 1633# - build with mixed source and output 1634# - build with separate output dir 'make O=...' 1635# - external modules 1636# 1637# target-dir => where to store outputfile 1638# build-dir => directory in kernel source tree to use 1639 1640ifeq ($(KBUILD_EXTMOD),) 1641 build-dir = $(patsubst %/,%,$(dir $@)) 1642 target-dir = $(dir $@) 1643else 1644 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@))) 1645 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash)) 1646 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@)) 1647endif 1648 1649%.s: %.c prepare scripts FORCE 1650 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1651%.i: %.c prepare scripts FORCE 1652 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1653%.o: %.c prepare scripts FORCE 1654 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1655%.lst: %.c prepare scripts FORCE 1656 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1657%.s: %.S prepare scripts FORCE 1658 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1659%.o: %.S prepare scripts FORCE 1660 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1661%.symtypes: %.c prepare scripts FORCE 1662 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1663%.ll: %.c prepare scripts FORCE 1664 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1665 1666# Modules 1667/: prepare scripts FORCE 1668 $(cmd_crmodverdir) 1669 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1670 $(build)=$(build-dir) 1671# Make sure the latest headers are built for Documentation 1672Documentation/ samples/: headers_install 1673%/: prepare scripts FORCE 1674 $(cmd_crmodverdir) 1675 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1676 $(build)=$(build-dir) 1677%.ko: prepare scripts FORCE 1678 $(cmd_crmodverdir) 1679 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1680 $(build)=$(build-dir) $(@:.ko=.o) 1681 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1682 1683# FIXME Should go into a make.lib or something 1684# =========================================================================== 1685 1686quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs))) 1687 cmd_rmdirs = rm -rf $(rm-dirs) 1688 1689quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1690 cmd_rmfiles = rm -f $(rm-files) 1691 1692# Run depmod only if we have System.map and depmod is executable 1693quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) 1694 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1695 $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))" 1696 1697# Create temporary dir for module support files 1698# clean it up only when building all modules 1699cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \ 1700 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*) 1701 1702# read all saved command lines 1703 1704targets := $(wildcard $(sort $(targets))) 1705cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd)) 1706 1707ifneq ($(cmd_files),) 1708 $(cmd_files): ; # Do not try to update included dependency files 1709 include $(cmd_files) 1710endif 1711 1712endif # skip-makefile 1713 1714PHONY += FORCE 1715FORCE: 1716 1717# Declare the contents of the .PHONY variable as phony. We keep that 1718# information in a variable so we can use it in if_changed and friends. 1719.PHONY: $(PHONY) 1720