1VERSION = 4 2PATCHLEVEL = 7 3SUBLEVEL = 0 4EXTRAVERSION = -rc2 5NAME = Psychotic Stoned Sheep 6 7# *DOCUMENTATION* 8# To see a list of typical targets execute "make help" 9# More info can be located in ./README 10# Comments in this file are targeted only to the developer, do not 11# expect to learn how to build the kernel reading this file. 12 13# o Do not use make's built-in rules and variables 14# (this increases performance and avoids hard-to-debug behaviour); 15# o Look for make include files relative to root of kernel src 16MAKEFLAGS += -rR --include-dir=$(CURDIR) 17 18# Avoid funny character set dependencies 19unexport LC_ALL 20LC_COLLATE=C 21LC_NUMERIC=C 22export LC_COLLATE LC_NUMERIC 23 24# Avoid interference with shell env settings 25unexport GREP_OPTIONS 26 27# We are using a recursive build, so we need to do a little thinking 28# to get the ordering right. 29# 30# Most importantly: sub-Makefiles should only ever modify files in 31# their own directory. If in some directory we have a dependency on 32# a file in another dir (which doesn't happen often, but it's often 33# unavoidable when linking the built-in.o targets which finally 34# turn into vmlinux), we will call a sub make in that other dir, and 35# after that we are sure that everything which is in that other dir 36# is now up to date. 37# 38# The only cases where we need to modify files which have global 39# effects are thus separated out and done before the recursive 40# descending is started. They are now explicitly listed as the 41# prepare rule. 42 43# Beautify output 44# --------------------------------------------------------------------------- 45# 46# Normally, we echo the whole command before executing it. By making 47# that echo $($(quiet)$(cmd)), we now have the possibility to set 48# $(quiet) to choose other forms of output instead, e.g. 49# 50# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@ 51# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< 52# 53# If $(quiet) is empty, the whole command will be printed. 54# If it is set to "quiet_", only the short version will be printed. 55# If it is set to "silent_", nothing will be printed at all, since 56# the variable $(silent_cmd_cc_o_c) doesn't exist. 57# 58# A simple variant is to prefix commands with $(Q) - that's useful 59# for commands that shall be hidden in non-verbose mode. 60# 61# $(Q)ln $@ :< 62# 63# If KBUILD_VERBOSE equals 0 then the above command will be hidden. 64# If KBUILD_VERBOSE equals 1 then the above command is displayed. 65# 66# To put more focus on warnings, be less verbose as default 67# Use 'make V=1' to see the full commands 68 69ifeq ("$(origin V)", "command line") 70 KBUILD_VERBOSE = $(V) 71endif 72ifndef KBUILD_VERBOSE 73 KBUILD_VERBOSE = 0 74endif 75 76ifeq ($(KBUILD_VERBOSE),1) 77 quiet = 78 Q = 79else 80 quiet=quiet_ 81 Q = @ 82endif 83 84# If the user is running make -s (silent mode), suppress echoing of 85# commands 86 87ifneq ($(filter 4.%,$(MAKE_VERSION)),) # make-4 88ifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),) 89 quiet=silent_ 90endif 91else # make-3.8x 92ifneq ($(filter s% -s%,$(MAKEFLAGS)),) 93 quiet=silent_ 94endif 95endif 96 97export quiet Q KBUILD_VERBOSE 98 99# kbuild supports saving output files in a separate directory. 100# To locate output files in a separate directory two syntaxes are supported. 101# In both cases the working directory must be the root of the kernel src. 102# 1) O= 103# Use "make O=dir/to/store/output/files/" 104# 105# 2) Set KBUILD_OUTPUT 106# Set the environment variable KBUILD_OUTPUT to point to the directory 107# where the output files shall be placed. 108# export KBUILD_OUTPUT=dir/to/store/output/files/ 109# make 110# 111# The O= assignment takes precedence over the KBUILD_OUTPUT environment 112# variable. 113 114# KBUILD_SRC is set on invocation of make in OBJ directory 115# KBUILD_SRC is not intended to be used by the regular user (for now) 116ifeq ($(KBUILD_SRC),) 117 118# OK, Make called in directory where kernel src resides 119# Do we want to locate output files in a separate directory? 120ifeq ("$(origin O)", "command line") 121 KBUILD_OUTPUT := $(O) 122endif 123 124# That's our default target when none is given on the command line 125PHONY := _all 126_all: 127 128# Cancel implicit rules on top Makefile 129$(CURDIR)/Makefile Makefile: ; 130 131ifneq ($(words $(subst :, ,$(CURDIR))), 1) 132 $(error main directory cannot contain spaces nor colons) 133endif 134 135ifneq ($(KBUILD_OUTPUT),) 136# Invoke a second make in the output directory, passing relevant variables 137# check that the output directory actually exists 138saved-output := $(KBUILD_OUTPUT) 139KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \ 140 && /bin/pwd) 141$(if $(KBUILD_OUTPUT),, \ 142 $(error failed to create output directory "$(saved-output)")) 143 144PHONY += $(MAKECMDGOALS) sub-make 145 146$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make 147 @: 148 149sub-make: 150 $(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \ 151 -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS)) 152 153# Leave processing to above invocation of make 154skip-makefile := 1 155endif # ifneq ($(KBUILD_OUTPUT),) 156endif # ifeq ($(KBUILD_SRC),) 157 158# We process the rest of the Makefile if this is the final invocation of make 159ifeq ($(skip-makefile),) 160 161# Do not print "Entering directory ...", 162# but we want to display it when entering to the output directory 163# so that IDEs/editors are able to understand relative filenames. 164MAKEFLAGS += --no-print-directory 165 166# Call a source code checker (by default, "sparse") as part of the 167# C compilation. 168# 169# Use 'make C=1' to enable checking of only re-compiled files. 170# Use 'make C=2' to enable checking of *all* source files, regardless 171# of whether they are re-compiled or not. 172# 173# See the file "Documentation/sparse.txt" for more details, including 174# where to get the "sparse" utility. 175 176ifeq ("$(origin C)", "command line") 177 KBUILD_CHECKSRC = $(C) 178endif 179ifndef KBUILD_CHECKSRC 180 KBUILD_CHECKSRC = 0 181endif 182 183# Use make M=dir to specify directory of external module to build 184# Old syntax make ... SUBDIRS=$PWD is still supported 185# Setting the environment variable KBUILD_EXTMOD take precedence 186ifdef SUBDIRS 187 KBUILD_EXTMOD ?= $(SUBDIRS) 188endif 189 190ifeq ("$(origin M)", "command line") 191 KBUILD_EXTMOD := $(M) 192endif 193 194# If building an external module we do not care about the all: rule 195# but instead _all depend on modules 196PHONY += all 197ifeq ($(KBUILD_EXTMOD),) 198_all: all 199else 200_all: modules 201endif 202 203ifeq ($(KBUILD_SRC),) 204 # building in the source tree 205 srctree := . 206else 207 ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR))) 208 # building in a subdirectory of the source tree 209 srctree := .. 210 else 211 srctree := $(KBUILD_SRC) 212 endif 213endif 214objtree := . 215src := $(srctree) 216obj := $(objtree) 217 218VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD)) 219 220export srctree objtree VPATH 221 222# SUBARCH tells the usermode build what the underlying arch is. That is set 223# first, and if a usermode build is happening, the "ARCH=um" on the command 224# line overrides the setting of ARCH below. If a native build is happening, 225# then ARCH is assigned, getting whatever value it gets normally, and 226# SUBARCH is subsequently ignored. 227 228SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \ 229 -e s/sun4u/sparc64/ \ 230 -e s/arm.*/arm/ -e s/sa110/arm/ \ 231 -e s/s390x/s390/ -e s/parisc64/parisc/ \ 232 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \ 233 -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ ) 234 235# Cross compiling and selecting different set of gcc/bin-utils 236# --------------------------------------------------------------------------- 237# 238# When performing cross compilation for other architectures ARCH shall be set 239# to the target architecture. (See arch/* for the possibilities). 240# ARCH can be set during invocation of make: 241# make ARCH=ia64 242# Another way is to have ARCH set in the environment. 243# The default ARCH is the host where make is executed. 244 245# CROSS_COMPILE specify the prefix used for all executables used 246# during compilation. Only gcc and related bin-utils executables 247# are prefixed with $(CROSS_COMPILE). 248# CROSS_COMPILE can be set on the command line 249# make CROSS_COMPILE=ia64-linux- 250# Alternatively CROSS_COMPILE can be set in the environment. 251# A third alternative is to store a setting in .config so that plain 252# "make" in the configured kernel build directory always uses that. 253# Default value for CROSS_COMPILE is not to prefix executables 254# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 255ARCH ?= $(SUBARCH) 256CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%) 257 258# Architecture as present in compile.h 259UTS_MACHINE := $(ARCH) 260SRCARCH := $(ARCH) 261 262# Additional ARCH settings for x86 263ifeq ($(ARCH),i386) 264 SRCARCH := x86 265endif 266ifeq ($(ARCH),x86_64) 267 SRCARCH := x86 268endif 269 270# Additional ARCH settings for sparc 271ifeq ($(ARCH),sparc32) 272 SRCARCH := sparc 273endif 274ifeq ($(ARCH),sparc64) 275 SRCARCH := sparc 276endif 277 278# Additional ARCH settings for sh 279ifeq ($(ARCH),sh64) 280 SRCARCH := sh 281endif 282 283# Additional ARCH settings for tile 284ifeq ($(ARCH),tilepro) 285 SRCARCH := tile 286endif 287ifeq ($(ARCH),tilegx) 288 SRCARCH := tile 289endif 290 291# Where to locate arch specific headers 292hdr-arch := $(SRCARCH) 293 294KCONFIG_CONFIG ?= .config 295export KCONFIG_CONFIG 296 297# SHELL used by kbuild 298CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \ 299 else if [ -x /bin/bash ]; then echo /bin/bash; \ 300 else echo sh; fi ; fi) 301 302HOSTCC = gcc 303HOSTCXX = g++ 304HOSTCFLAGS = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer -std=gnu89 305HOSTCXXFLAGS = -O2 306 307ifeq ($(shell $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1) 308HOSTCFLAGS += -Wno-unused-value -Wno-unused-parameter \ 309 -Wno-missing-field-initializers -fno-delete-null-pointer-checks 310endif 311 312# Decide whether to build built-in, modular, or both. 313# Normally, just do built-in. 314 315KBUILD_MODULES := 316KBUILD_BUILTIN := 1 317 318# If we have only "make modules", don't compile built-in objects. 319# When we're building modules with modversions, we need to consider 320# the built-in objects during the descend as well, in order to 321# make sure the checksums are up to date before we record them. 322 323ifeq ($(MAKECMDGOALS),modules) 324 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1) 325endif 326 327# If we have "make <whatever> modules", compile modules 328# in addition to whatever we do anyway. 329# Just "make" or "make all" shall build modules as well 330 331ifneq ($(filter all _all modules,$(MAKECMDGOALS)),) 332 KBUILD_MODULES := 1 333endif 334 335ifeq ($(MAKECMDGOALS),) 336 KBUILD_MODULES := 1 337endif 338 339export KBUILD_MODULES KBUILD_BUILTIN 340export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD 341 342# We need some generic definitions (do not try to remake the file). 343scripts/Kbuild.include: ; 344include scripts/Kbuild.include 345 346# Make variables (CC, etc...) 347AS = $(CROSS_COMPILE)as 348LD = $(CROSS_COMPILE)ld 349CC = $(CROSS_COMPILE)gcc 350CPP = $(CC) -E 351AR = $(CROSS_COMPILE)ar 352NM = $(CROSS_COMPILE)nm 353STRIP = $(CROSS_COMPILE)strip 354OBJCOPY = $(CROSS_COMPILE)objcopy 355OBJDUMP = $(CROSS_COMPILE)objdump 356AWK = awk 357GENKSYMS = scripts/genksyms/genksyms 358INSTALLKERNEL := installkernel 359DEPMOD = /sbin/depmod 360PERL = perl 361PYTHON = python 362CHECK = sparse 363 364CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 365 -Wbitwise -Wno-return-void $(CF) 366CFLAGS_MODULE = 367AFLAGS_MODULE = 368LDFLAGS_MODULE = 369CFLAGS_KERNEL = 370AFLAGS_KERNEL = 371CFLAGS_GCOV = -fprofile-arcs -ftest-coverage -fno-tree-loop-im -Wno-maybe-uninitialized 372CFLAGS_KCOV = -fsanitize-coverage=trace-pc 373 374 375# Use USERINCLUDE when you must reference the UAPI directories only. 376USERINCLUDE := \ 377 -I$(srctree)/arch/$(hdr-arch)/include/uapi \ 378 -Iarch/$(hdr-arch)/include/generated/uapi \ 379 -I$(srctree)/include/uapi \ 380 -Iinclude/generated/uapi \ 381 -include $(srctree)/include/linux/kconfig.h 382 383# Use LINUXINCLUDE when you must reference the include/ directory. 384# Needed to be compatible with the O= option 385LINUXINCLUDE := \ 386 -I$(srctree)/arch/$(hdr-arch)/include \ 387 -Iarch/$(hdr-arch)/include/generated/uapi \ 388 -Iarch/$(hdr-arch)/include/generated \ 389 $(if $(KBUILD_SRC), -I$(srctree)/include) \ 390 -Iinclude \ 391 $(USERINCLUDE) 392 393KBUILD_CPPFLAGS := -D__KERNEL__ 394 395KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \ 396 -fno-strict-aliasing -fno-common \ 397 -Werror-implicit-function-declaration \ 398 -Wno-format-security \ 399 -std=gnu89 400 401KBUILD_AFLAGS_KERNEL := 402KBUILD_CFLAGS_KERNEL := 403KBUILD_AFLAGS := -D__ASSEMBLY__ 404KBUILD_AFLAGS_MODULE := -DMODULE 405KBUILD_CFLAGS_MODULE := -DMODULE 406KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds 407 408# Read KERNELRELEASE from include/config/kernel.release (if it exists) 409KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null) 410KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 411 412export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 413export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC 414export CPP AR NM STRIP OBJCOPY OBJDUMP 415export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE 416export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS 417 418export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS 419export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV CFLAGS_KCOV CFLAGS_KASAN CFLAGS_UBSAN 420export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 421export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 422export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 423export KBUILD_ARFLAGS 424 425# When compiling out-of-tree modules, put MODVERDIR in the module 426# tree rather than in the kernel tree. The kernel tree might 427# even be read-only. 428export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions 429 430# Files to ignore in find ... statements 431 432export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 433 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 434 -prune -o 435export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 436 --exclude CVS --exclude .pc --exclude .hg --exclude .git 437 438# =========================================================================== 439# Rules shared between *config targets and build targets 440 441# Basic helpers built in scripts/ 442PHONY += scripts_basic 443scripts_basic: 444 $(Q)$(MAKE) $(build)=scripts/basic 445 $(Q)rm -f .tmp_quiet_recordmcount 446 447# To avoid any implicit rule to kick in, define an empty command. 448scripts/basic/%: scripts_basic ; 449 450PHONY += outputmakefile 451# outputmakefile generates a Makefile in the output directory, if using a 452# separate output directory. This allows convenient use of make in the 453# output directory. 454outputmakefile: 455ifneq ($(KBUILD_SRC),) 456 $(Q)ln -fsn $(srctree) source 457 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \ 458 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL) 459endif 460 461# Support for using generic headers in asm-generic 462PHONY += asm-generic 463asm-generic: 464 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \ 465 src=asm obj=arch/$(SRCARCH)/include/generated/asm 466 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \ 467 src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm 468 469# To make sure we do not include .config for any of the *config targets 470# catch them early, and hand them over to scripts/kconfig/Makefile 471# It is allowed to specify more targets when calling make, including 472# mixing *config targets and build targets. 473# For example 'make oldconfig all'. 474# Detect when mixed targets is specified, and make a second invocation 475# of make so .config is not included in this case either (for *config). 476 477version_h := include/generated/uapi/linux/version.h 478old_version_h := include/linux/version.h 479 480no-dot-config-targets := clean mrproper distclean \ 481 cscope gtags TAGS tags help% %docs check% coccicheck \ 482 $(version_h) headers_% archheaders archscripts \ 483 kernelversion %src-pkg 484 485config-targets := 0 486mixed-targets := 0 487dot-config := 1 488 489ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 490 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 491 dot-config := 0 492 endif 493endif 494 495ifeq ($(KBUILD_EXTMOD),) 496 ifneq ($(filter config %config,$(MAKECMDGOALS)),) 497 config-targets := 1 498 ifneq ($(words $(MAKECMDGOALS)),1) 499 mixed-targets := 1 500 endif 501 endif 502endif 503# install and module_install need also be processed one by one 504ifneq ($(filter install,$(MAKECMDGOALS)),) 505 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 506 mixed-targets := 1 507 endif 508endif 509 510ifeq ($(mixed-targets),1) 511# =========================================================================== 512# We're called with mixed targets (*config and build targets). 513# Handle them one by one. 514 515PHONY += $(MAKECMDGOALS) __build_one_by_one 516 517$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one 518 @: 519 520__build_one_by_one: 521 $(Q)set -e; \ 522 for i in $(MAKECMDGOALS); do \ 523 $(MAKE) -f $(srctree)/Makefile $$i; \ 524 done 525 526else 527ifeq ($(config-targets),1) 528# =========================================================================== 529# *config targets only - make sure prerequisites are updated, and descend 530# in scripts/kconfig to make the *config target 531 532# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 533# KBUILD_DEFCONFIG may point out an alternative default configuration 534# used for 'make defconfig' 535include arch/$(SRCARCH)/Makefile 536export KBUILD_DEFCONFIG KBUILD_KCONFIG 537 538config: scripts_basic outputmakefile FORCE 539 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 540 541%config: scripts_basic outputmakefile FORCE 542 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 543 544else 545# =========================================================================== 546# Build targets only - this includes vmlinux, arch specific targets, clean 547# targets and others. In general all targets except *config targets. 548 549ifeq ($(KBUILD_EXTMOD),) 550# Additional helpers built in scripts/ 551# Carefully list dependencies so we do not try to build scripts twice 552# in parallel 553PHONY += scripts 554scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \ 555 asm-generic 556 $(Q)$(MAKE) $(build)=$(@) 557 558# Objects we will link into vmlinux / subdirs we need to visit 559init-y := init/ 560drivers-y := drivers/ sound/ firmware/ 561net-y := net/ 562libs-y := lib/ 563core-y := usr/ 564virt-y := virt/ 565endif # KBUILD_EXTMOD 566 567ifeq ($(dot-config),1) 568# Read in config 569-include include/config/auto.conf 570 571ifeq ($(KBUILD_EXTMOD),) 572# Read in dependencies to all Kconfig* files, make sure to run 573# oldconfig if changes are detected. 574-include include/config/auto.conf.cmd 575 576# To avoid any implicit rule to kick in, define an empty command 577$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ; 578 579# If .config is newer than include/config/auto.conf, someone tinkered 580# with it and forgot to run make oldconfig. 581# if auto.conf.cmd is missing then we are probably in a cleaned tree so 582# we execute the config step to be sure to catch updated Kconfig files 583include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd 584 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig 585else 586# external modules needs include/generated/autoconf.h and include/config/auto.conf 587# but do not care if they are up-to-date. Use auto.conf to trigger the test 588PHONY += include/config/auto.conf 589 590include/config/auto.conf: 591 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 592 echo >&2; \ 593 echo >&2 " ERROR: Kernel configuration is invalid."; \ 594 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 595 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 596 echo >&2 ; \ 597 /bin/false) 598 599endif # KBUILD_EXTMOD 600 601else 602# Dummy target needed, because used as prerequisite 603include/config/auto.conf: ; 604endif # $(dot-config) 605 606# The all: target is the default when no target is given on the 607# command line. 608# This allow a user to issue only 'make' to build a kernel including modules 609# Defaults to vmlinux, but the arch makefile usually adds further targets 610all: vmlinux 611 612# The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default 613# values of the respective KBUILD_* variables 614ARCH_CPPFLAGS := 615ARCH_AFLAGS := 616ARCH_CFLAGS := 617include arch/$(SRCARCH)/Makefile 618 619KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,) 620 621ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 622KBUILD_CFLAGS += -Os $(call cc-disable-warning,maybe-uninitialized,) 623else 624ifdef CONFIG_PROFILE_ALL_BRANCHES 625KBUILD_CFLAGS += -O2 $(call cc-disable-warning,maybe-uninitialized,) 626else 627KBUILD_CFLAGS += -O2 628endif 629endif 630 631# Tell gcc to never replace conditional load with a non-conditional one 632KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 633 634ifdef CONFIG_READABLE_ASM 635# Disable optimizations that make assembler listings hard to read. 636# reorder blocks reorders the control in the function 637# ipa clone creates specialized cloned functions 638# partial inlining inlines only parts of functions 639KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \ 640 $(call cc-option,-fno-ipa-cp-clone,) \ 641 $(call cc-option,-fno-partial-inlining) 642endif 643 644ifneq ($(CONFIG_FRAME_WARN),0) 645KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN}) 646endif 647 648# Handle stack protector mode. 649# 650# Since kbuild can potentially perform two passes (first with the old 651# .config values and then with updated .config values), we cannot error out 652# if a desired compiler option is unsupported. If we were to error, kbuild 653# could never get to the second pass and actually notice that we changed 654# the option to something that was supported. 655# 656# Additionally, we don't want to fallback and/or silently change which compiler 657# flags will be used, since that leads to producing kernels with different 658# security feature characteristics depending on the compiler used. ("But I 659# selected CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!") 660# 661# The middle ground is to warn here so that the failed option is obvious, but 662# to let the build fail with bad compiler flags so that we can't produce a 663# kernel when there is a CONFIG and compiler mismatch. 664# 665ifdef CONFIG_CC_STACKPROTECTOR_REGULAR 666 stackp-flag := -fstack-protector 667 ifeq ($(call cc-option, $(stackp-flag)),) 668 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_REGULAR: \ 669 -fstack-protector not supported by compiler) 670 endif 671else 672ifdef CONFIG_CC_STACKPROTECTOR_STRONG 673 stackp-flag := -fstack-protector-strong 674 ifeq ($(call cc-option, $(stackp-flag)),) 675 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: \ 676 -fstack-protector-strong not supported by compiler) 677 endif 678else 679 # Force off for distro compilers that enable stack protector by default. 680 stackp-flag := $(call cc-option, -fno-stack-protector) 681endif 682endif 683KBUILD_CFLAGS += $(stackp-flag) 684 685ifdef CONFIG_KCOV 686 ifeq ($(call cc-option, $(CFLAGS_KCOV)),) 687 $(warning Cannot use CONFIG_KCOV: \ 688 -fsanitize-coverage=trace-pc is not supported by compiler) 689 CFLAGS_KCOV = 690 endif 691endif 692 693ifeq ($(cc-name),clang) 694KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,) 695KBUILD_CPPFLAGS += $(call cc-option,-Wno-unknown-warning-option,) 696KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable) 697KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier) 698KBUILD_CFLAGS += $(call cc-disable-warning, gnu) 699# Quiet clang warning: comparison of unsigned expression < 0 is always false 700KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare) 701# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the 702# source of a reference will be _MergedGlobals and not on of the whitelisted names. 703# See modpost pattern 2 704KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,) 705KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior) 706else 707 708# These warnings generated too much noise in a regular build. 709# Use make W=1 to enable them (see scripts/Makefile.build) 710KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable) 711KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) 712endif 713 714ifdef CONFIG_FRAME_POINTER 715KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 716else 717# Some targets (ARM with Thumb2, for example), can't be built with frame 718# pointers. For those, we don't have FUNCTION_TRACER automatically 719# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 720# incompatible with -fomit-frame-pointer with current GCC, so we don't use 721# -fomit-frame-pointer with FUNCTION_TRACER. 722ifndef CONFIG_FUNCTION_TRACER 723KBUILD_CFLAGS += -fomit-frame-pointer 724endif 725endif 726 727KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments) 728 729ifdef CONFIG_DEBUG_INFO 730ifdef CONFIG_DEBUG_INFO_SPLIT 731KBUILD_CFLAGS += $(call cc-option, -gsplit-dwarf, -g) 732else 733KBUILD_CFLAGS += -g 734endif 735KBUILD_AFLAGS += -Wa,-gdwarf-2 736endif 737ifdef CONFIG_DEBUG_INFO_DWARF4 738KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,) 739endif 740 741ifdef CONFIG_DEBUG_INFO_REDUCED 742KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \ 743 $(call cc-option,-fno-var-tracking) 744endif 745 746ifdef CONFIG_FUNCTION_TRACER 747ifndef CC_FLAGS_FTRACE 748CC_FLAGS_FTRACE := -pg 749endif 750export CC_FLAGS_FTRACE 751ifdef CONFIG_HAVE_FENTRY 752CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY) 753endif 754KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY) 755KBUILD_AFLAGS += $(CC_USING_FENTRY) 756ifdef CONFIG_DYNAMIC_FTRACE 757 ifdef CONFIG_HAVE_C_RECORDMCOUNT 758 BUILD_C_RECORDMCOUNT := y 759 export BUILD_C_RECORDMCOUNT 760 endif 761endif 762endif 763 764# We trigger additional mismatches with less inlining 765ifdef CONFIG_DEBUG_SECTION_MISMATCH 766KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) 767endif 768 769# arch Makefile may override CC so keep this after arch Makefile is included 770NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) 771CHECKFLAGS += $(NOSTDINC_FLAGS) 772 773# warn about C99 declaration after statement 774KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,) 775 776# disable pointer signed / unsigned warnings in gcc 4.0 777KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign) 778 779# disable invalid "can't wrap" optimizations for signed / pointers 780KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow) 781 782# conserve stack if available 783KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) 784 785# disallow errors like 'EXPORT_GPL(foo);' with missing header 786KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int) 787 788# require functions to have arguments in prototypes, not empty 'int foo()' 789KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes) 790 791# Prohibit date/time macros, which would make the build non-deterministic 792KBUILD_CFLAGS += $(call cc-option,-Werror=date-time) 793 794# enforce correct pointer usage 795KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 796 797# use the deterministic mode of AR if available 798KBUILD_ARFLAGS := $(call ar-option,D) 799 800# check for 'asm goto' 801ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y) 802 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO 803 KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO 804endif 805 806include scripts/Makefile.kasan 807include scripts/Makefile.extrawarn 808include scripts/Makefile.ubsan 809 810# Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the 811# last assignments 812KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS) 813KBUILD_AFLAGS += $(ARCH_AFLAGS) $(KAFLAGS) 814KBUILD_CFLAGS += $(ARCH_CFLAGS) $(KCFLAGS) 815 816# Use --build-id when available. 817LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\ 818 $(call cc-ldoption, -Wl$(comma)--build-id,)) 819KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID) 820LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID) 821 822ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 823LDFLAGS_vmlinux += $(call ld-option, -X,) 824endif 825 826# Default kernel image to build when no specific target is given. 827# KBUILD_IMAGE may be overruled on the command line or 828# set in the environment 829# Also any assignments in arch/$(ARCH)/Makefile take precedence over 830# this default value 831export KBUILD_IMAGE ?= vmlinux 832 833# 834# INSTALL_PATH specifies where to place the updated kernel and system map 835# images. Default is /boot, but you can set it to other values 836export INSTALL_PATH ?= /boot 837 838# 839# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 840# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 841# an argument if needed. Otherwise it defaults to the kernel install path 842# 843export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 844 845# 846# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 847# relocations required by build roots. This is not defined in the 848# makefile but the argument can be passed to make if needed. 849# 850 851MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 852export MODLIB 853 854# 855# INSTALL_MOD_STRIP, if defined, will cause modules to be 856# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then 857# the default option --strip-debug will be used. Otherwise, 858# INSTALL_MOD_STRIP value will be used as the options to the strip command. 859 860ifdef INSTALL_MOD_STRIP 861ifeq ($(INSTALL_MOD_STRIP),1) 862mod_strip_cmd = $(STRIP) --strip-debug 863else 864mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP) 865endif # INSTALL_MOD_STRIP=1 866else 867mod_strip_cmd = true 868endif # INSTALL_MOD_STRIP 869export mod_strip_cmd 870 871# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed 872# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP 873# or CONFIG_MODULE_COMPRESS_XZ. 874 875mod_compress_cmd = true 876ifdef CONFIG_MODULE_COMPRESS 877 ifdef CONFIG_MODULE_COMPRESS_GZIP 878 mod_compress_cmd = gzip -n -f 879 endif # CONFIG_MODULE_COMPRESS_GZIP 880 ifdef CONFIG_MODULE_COMPRESS_XZ 881 mod_compress_cmd = xz -f 882 endif # CONFIG_MODULE_COMPRESS_XZ 883endif # CONFIG_MODULE_COMPRESS 884export mod_compress_cmd 885 886# Select initial ramdisk compression format, default is gzip(1). 887# This shall be used by the dracut(8) tool while creating an initramfs image. 888# 889INITRD_COMPRESS-y := gzip 890INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2 891INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma 892INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz 893INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo 894INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4 895# do not export INITRD_COMPRESS, since we didn't actually 896# choose a sane default compression above. 897# export INITRD_COMPRESS := $(INITRD_COMPRESS-y) 898 899ifdef CONFIG_MODULE_SIG_ALL 900$(eval $(call config_filename,MODULE_SIG_KEY)) 901 902mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509 903else 904mod_sign_cmd = true 905endif 906export mod_sign_cmd 907 908 909ifeq ($(KBUILD_EXTMOD),) 910core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/ 911 912vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \ 913 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 914 $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y))) 915 916vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \ 917 $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-)))) 918 919init-y := $(patsubst %/, %/built-in.o, $(init-y)) 920core-y := $(patsubst %/, %/built-in.o, $(core-y)) 921drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y)) 922net-y := $(patsubst %/, %/built-in.o, $(net-y)) 923libs-y1 := $(patsubst %/, %/lib.a, $(libs-y)) 924libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y)) 925libs-y := $(libs-y1) $(libs-y2) 926virt-y := $(patsubst %/, %/built-in.o, $(virt-y)) 927 928# Externally visible symbols (used by link-vmlinux.sh) 929export KBUILD_VMLINUX_INIT := $(head-y) $(init-y) 930export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y) $(virt-y) 931export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 932export LDFLAGS_vmlinux 933# used by scripts/pacmage/Makefile 934export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools) 935 936vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) 937 938# Include targets which we want to execute sequentially if the rest of the 939# kernel build went well. If CONFIG_TRIM_UNUSED_KSYMS is set, this might be 940# evaluated more than once. 941PHONY += vmlinux_prereq 942vmlinux_prereq: $(vmlinux-deps) FORCE 943ifdef CONFIG_HEADERS_CHECK 944 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check 945endif 946ifdef CONFIG_BUILD_DOCSRC 947 $(Q)$(MAKE) $(build)=Documentation 948endif 949ifdef CONFIG_GDB_SCRIPTS 950 $(Q)ln -fsn `cd $(srctree) && /bin/pwd`/scripts/gdb/vmlinux-gdb.py 951endif 952ifdef CONFIG_TRIM_UNUSED_KSYMS 953 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ 954 "$(MAKE) KBUILD_MODULES=1 -f $(srctree)/Makefile vmlinux_prereq" 955endif 956 957# standalone target for easier testing 958include/generated/autoksyms.h: FORCE 959 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh true 960 961# Final link of vmlinux 962 cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) 963quiet_cmd_link-vmlinux = LINK $@ 964 965vmlinux: scripts/link-vmlinux.sh vmlinux_prereq $(vmlinux-deps) FORCE 966 +$(call if_changed,link-vmlinux) 967 968# Build samples along the rest of the kernel 969ifdef CONFIG_SAMPLES 970vmlinux-dirs += samples 971endif 972 973# The actual objects are generated when descending, 974# make sure no implicit rule kicks in 975$(sort $(vmlinux-deps)): $(vmlinux-dirs) ; 976 977# Handle descending into subdirectories listed in $(vmlinux-dirs) 978# Preset locale variables to speed up the build process. Limit locale 979# tweaks to this spot to avoid wrong language settings when running 980# make menuconfig etc. 981# Error messages still appears in the original language 982 983PHONY += $(vmlinux-dirs) 984$(vmlinux-dirs): prepare scripts 985 $(Q)$(MAKE) $(build)=$@ 986 987define filechk_kernel.release 988 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 989endef 990 991# Store (new) KERNELRELEASE string in include/config/kernel.release 992include/config/kernel.release: include/config/auto.conf FORCE 993 $(call filechk,kernel.release) 994 995 996# Things we need to do before we recursively start building the kernel 997# or the modules are listed in "prepare". 998# A multi level approach is used. prepareN is processed before prepareN-1. 999# archprepare is used in arch Makefiles and when processed asm symlink, 1000# version.h and scripts_basic is processed / created. 1001 1002# Listed in dependency order 1003PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3 1004 1005# prepare3 is used to check if we are building in a separate output directory, 1006# and if so do: 1007# 1) Check that make has not been executed in the kernel src $(srctree) 1008prepare3: include/config/kernel.release 1009ifneq ($(KBUILD_SRC),) 1010 @$(kecho) ' Using $(srctree) as source for kernel' 1011 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \ 1012 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \ 1013 echo >&2 " in the '$(srctree)' directory.";\ 1014 /bin/false; \ 1015 fi; 1016endif 1017 1018# prepare2 creates a makefile if using a separate output directory 1019prepare2: prepare3 outputmakefile asm-generic 1020 1021prepare1: prepare2 $(version_h) include/generated/utsrelease.h \ 1022 include/config/auto.conf 1023 $(cmd_crmodverdir) 1024 $(Q)test -e include/generated/autoksyms.h || \ 1025 touch include/generated/autoksyms.h 1026 1027archprepare: archheaders archscripts prepare1 scripts_basic 1028 1029prepare0: archprepare 1030 $(Q)$(MAKE) $(build)=. 1031 1032# All the preparing.. 1033prepare: prepare0 prepare-objtool 1034 1035ifdef CONFIG_STACK_VALIDATION 1036 has_libelf := $(call try-run,\ 1037 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0) 1038 ifeq ($(has_libelf),1) 1039 objtool_target := tools/objtool FORCE 1040 else 1041 $(warning "Cannot use CONFIG_STACK_VALIDATION, please install libelf-dev or elfutils-libelf-devel") 1042 SKIP_STACK_VALIDATION := 1 1043 export SKIP_STACK_VALIDATION 1044 endif 1045endif 1046 1047PHONY += prepare-objtool 1048prepare-objtool: $(objtool_target) 1049 1050# Generate some files 1051# --------------------------------------------------------------------------- 1052 1053# KERNELRELEASE can change from a few different places, meaning version.h 1054# needs to be updated, so this check is forced on all builds 1055 1056uts_len := 64 1057define filechk_utsrelease.h 1058 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1059 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1060 exit 1; \ 1061 fi; \ 1062 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";) 1063endef 1064 1065define filechk_version.h 1066 (echo \#define LINUX_VERSION_CODE $(shell \ 1067 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \ 1068 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';) 1069endef 1070 1071$(version_h): $(srctree)/Makefile FORCE 1072 $(call filechk,version.h) 1073 $(Q)rm -f $(old_version_h) 1074 1075include/generated/utsrelease.h: include/config/kernel.release FORCE 1076 $(call filechk,utsrelease.h) 1077 1078PHONY += headerdep 1079headerdep: 1080 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1081 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1082 1083# --------------------------------------------------------------------------- 1084# Firmware install 1085INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware 1086export INSTALL_FW_PATH 1087 1088PHONY += firmware_install 1089firmware_install: 1090 @mkdir -p $(objtree)/firmware 1091 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install 1092 1093# --------------------------------------------------------------------------- 1094# Kernel headers 1095 1096#Default location for installed headers 1097export INSTALL_HDR_PATH = $(objtree)/usr 1098 1099# If we do an all arch process set dst to asm-$(hdr-arch) 1100hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm) 1101 1102PHONY += archheaders 1103archheaders: 1104 1105PHONY += archscripts 1106archscripts: 1107 1108PHONY += __headers 1109__headers: $(version_h) scripts_basic asm-generic archheaders archscripts 1110 $(Q)$(MAKE) $(build)=scripts build_unifdef 1111 1112PHONY += headers_install_all 1113headers_install_all: 1114 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install 1115 1116PHONY += headers_install 1117headers_install: __headers 1118 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \ 1119 $(error Headers not exportable for the $(SRCARCH) architecture)) 1120 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1121 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) 1122 1123PHONY += headers_check_all 1124headers_check_all: headers_install_all 1125 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check 1126 1127PHONY += headers_check 1128headers_check: headers_install 1129 $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1 1130 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1 1131 1132# --------------------------------------------------------------------------- 1133# Kernel selftest 1134 1135PHONY += kselftest 1136kselftest: 1137 $(Q)$(MAKE) -C tools/testing/selftests run_tests 1138 1139kselftest-clean: 1140 $(Q)$(MAKE) -C tools/testing/selftests clean 1141 1142PHONY += kselftest-merge 1143kselftest-merge: 1144 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1145 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \ 1146 -m $(objtree)/.config \ 1147 $(srctree)/tools/testing/selftests/*/config 1148 +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1149 1150# --------------------------------------------------------------------------- 1151# Modules 1152 1153ifdef CONFIG_MODULES 1154 1155# By default, build modules as well 1156 1157all: modules 1158 1159# Build modules 1160# 1161# A module can be listed more than once in obj-m resulting in 1162# duplicate lines in modules.order files. Those are removed 1163# using awk while concatenating to the final file. 1164 1165PHONY += modules 1166modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin 1167 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order 1168 @$(kecho) ' Building modules, stage 2.'; 1169 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1170 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild 1171 1172modules.builtin: $(vmlinux-dirs:%=%/modules.builtin) 1173 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin 1174 1175%/modules.builtin: include/config/auto.conf 1176 $(Q)$(MAKE) $(modbuiltin)=$* 1177 1178 1179# Target to prepare building external modules 1180PHONY += modules_prepare 1181modules_prepare: prepare scripts 1182 1183# Target to install modules 1184PHONY += modules_install 1185modules_install: _modinst_ _modinst_post 1186 1187PHONY += _modinst_ 1188_modinst_: 1189 @rm -rf $(MODLIB)/kernel 1190 @rm -f $(MODLIB)/source 1191 @mkdir -p $(MODLIB)/kernel 1192 @ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source 1193 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1194 rm -f $(MODLIB)/build ; \ 1195 ln -s $(CURDIR) $(MODLIB)/build ; \ 1196 fi 1197 @cp -f $(objtree)/modules.order $(MODLIB)/ 1198 @cp -f $(objtree)/modules.builtin $(MODLIB)/ 1199 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1200 1201# This depmod is only for convenience to give the initial 1202# boot a modules.dep even before / is mounted read-write. However the 1203# boot script depmod is the master version. 1204PHONY += _modinst_post 1205_modinst_post: _modinst_ 1206 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst 1207 $(call cmd,depmod) 1208 1209ifeq ($(CONFIG_MODULE_SIG), y) 1210PHONY += modules_sign 1211modules_sign: 1212 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign 1213endif 1214 1215else # CONFIG_MODULES 1216 1217# Modules not configured 1218# --------------------------------------------------------------------------- 1219 1220PHONY += modules modules_install 1221modules modules_install: 1222 @echo >&2 1223 @echo >&2 "The present kernel configuration has modules disabled." 1224 @echo >&2 "Type 'make config' and enable loadable module support." 1225 @echo >&2 "Then build a kernel with module support enabled." 1226 @echo >&2 1227 @exit 1 1228 1229endif # CONFIG_MODULES 1230 1231### 1232# Cleaning is done on three levels. 1233# make clean Delete most generated files 1234# Leave enough to build external modules 1235# make mrproper Delete the current configuration, and all generated files 1236# make distclean Remove editor backup files, patch leftover files and the like 1237 1238# Directories & files removed with 'make clean' 1239CLEAN_DIRS += $(MODVERDIR) 1240 1241# Directories & files removed with 'make mrproper' 1242MRPROPER_DIRS += include/config usr/include include/generated \ 1243 arch/*/include/generated .tmp_objdiff 1244MRPROPER_FILES += .config .config.old .version .old_version \ 1245 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \ 1246 signing_key.pem signing_key.priv signing_key.x509 \ 1247 x509.genkey extra_certificates signing_key.x509.keyid \ 1248 signing_key.x509.signer vmlinux-gdb.py 1249 1250# clean - Delete most, but leave enough to build external modules 1251# 1252clean: rm-dirs := $(CLEAN_DIRS) 1253clean: rm-files := $(CLEAN_FILES) 1254clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples) 1255 1256PHONY += $(clean-dirs) clean archclean vmlinuxclean 1257$(clean-dirs): 1258 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1259 1260vmlinuxclean: 1261 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1262 1263clean: archclean vmlinuxclean 1264 1265# mrproper - Delete all generated files, including .config 1266# 1267mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS)) 1268mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1269mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts) 1270 1271PHONY += $(mrproper-dirs) mrproper archmrproper 1272$(mrproper-dirs): 1273 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1274 1275mrproper: clean archmrproper $(mrproper-dirs) 1276 $(call cmd,rmdirs) 1277 $(call cmd,rmfiles) 1278 1279# distclean 1280# 1281PHONY += distclean 1282 1283distclean: mrproper 1284 @find $(srctree) $(RCS_FIND_IGNORE) \ 1285 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1286 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \ 1287 -o -name '.*.rej' -o -name '*%' -o -name 'core' \) \ 1288 -type f -print | xargs rm -f 1289 1290 1291# Packaging of the kernel to various formats 1292# --------------------------------------------------------------------------- 1293# rpm target kept for backward compatibility 1294package-dir := scripts/package 1295 1296%src-pkg: FORCE 1297 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1298%pkg: include/config/kernel.release FORCE 1299 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1300rpm: include/config/kernel.release FORCE 1301 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1302 1303 1304# Brief documentation of the typical targets used 1305# --------------------------------------------------------------------------- 1306 1307boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1308boards := $(sort $(notdir $(boards))) 1309board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1310board-dirs := $(sort $(notdir $(board-dirs:/=))) 1311 1312PHONY += help 1313help: 1314 @echo 'Cleaning targets:' 1315 @echo ' clean - Remove most generated files but keep the config and' 1316 @echo ' enough build support to build external modules' 1317 @echo ' mrproper - Remove all generated files + config + various backup files' 1318 @echo ' distclean - mrproper + remove editor backup and patch files' 1319 @echo '' 1320 @echo 'Configuration targets:' 1321 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1322 @echo '' 1323 @echo 'Other generic targets:' 1324 @echo ' all - Build all targets marked with [*]' 1325 @echo '* vmlinux - Build the bare kernel' 1326 @echo '* modules - Build all modules' 1327 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1328 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH' 1329 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)' 1330 @echo ' dir/ - Build all files in dir and below' 1331 @echo ' dir/file.[ois] - Build specified target only' 1332 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1333 @echo ' (requires a recent binutils and recent build (System.map))' 1334 @echo ' dir/file.ko - Build module including final link' 1335 @echo ' modules_prepare - Set up for building external modules' 1336 @echo ' tags/TAGS - Generate tags file for editors' 1337 @echo ' cscope - Generate cscope index' 1338 @echo ' gtags - Generate GNU GLOBAL index' 1339 @echo ' kernelrelease - Output the release version string (use with make -s)' 1340 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1341 @echo ' image_name - Output the image name (use with make -s)' 1342 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1343 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1344 echo '' 1345 @echo 'Static analysers' 1346 @echo ' checkstack - Generate a list of stack hogs' 1347 @echo ' namespacecheck - Name space analysis on compiled kernel' 1348 @echo ' versioncheck - Sanity check on version.h usage' 1349 @echo ' includecheck - Check for duplicate included header files' 1350 @echo ' export_report - List the usages of all exported symbols' 1351 @echo ' headers_check - Sanity check on exported headers' 1352 @echo ' headerdep - Detect inclusion cycles in headers' 1353 @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help 1354 @echo '' 1355 @echo 'Kernel selftest' 1356 @echo ' kselftest - Build and run kernel selftest (run as root)' 1357 @echo ' Build, install, and boot kernel before' 1358 @echo ' running kselftest on it' 1359 @echo ' kselftest-clean - Remove all generated kselftest files' 1360 @echo ' kselftest-merge - Merge all the config dependencies of kselftest to existed' 1361 @echo ' .config.' 1362 @echo '' 1363 @echo 'Kernel packaging:' 1364 @$(MAKE) $(build)=$(package-dir) help 1365 @echo '' 1366 @echo 'Documentation targets:' 1367 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp 1368 @echo '' 1369 @echo 'Architecture specific targets ($(SRCARCH)):' 1370 @$(if $(archhelp),$(archhelp),\ 1371 echo ' No architecture specific help defined for $(SRCARCH)') 1372 @echo '' 1373 @$(if $(boards), \ 1374 $(foreach b, $(boards), \ 1375 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1376 echo '') 1377 @$(if $(board-dirs), \ 1378 $(foreach b, $(board-dirs), \ 1379 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1380 printf " %-16s - Show all of the above\\n" help-boards; \ 1381 echo '') 1382 1383 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1384 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1385 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1386 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)' 1387 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1388 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1389 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where' 1390 @echo ' 1: warnings which may be relevant and do not occur too often' 1391 @echo ' 2: warnings which occur quite often but may still be relevant' 1392 @echo ' 3: more obscure warnings, can most likely be ignored' 1393 @echo ' Multiple levels can be combined with W=12 or W=123' 1394 @echo '' 1395 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1396 @echo 'For further info see the ./README file' 1397 1398 1399help-board-dirs := $(addprefix help-,$(board-dirs)) 1400 1401help-boards: $(help-board-dirs) 1402 1403boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1404 1405$(help-board-dirs): help-%: 1406 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1407 @$(if $(boards-per-dir), \ 1408 $(foreach b, $(boards-per-dir), \ 1409 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1410 echo '') 1411 1412 1413# Documentation targets 1414# --------------------------------------------------------------------------- 1415%docs: scripts_basic FORCE 1416 $(Q)$(MAKE) $(build)=scripts build_docproc build_check-lc_ctype 1417 $(Q)$(MAKE) $(build)=Documentation/DocBook $@ 1418 1419else # KBUILD_EXTMOD 1420 1421### 1422# External module support. 1423# When building external modules the kernel used as basis is considered 1424# read-only, and no consistency checks are made and the make 1425# system is not used on the basis kernel. If updates are required 1426# in the basis kernel ordinary make commands (without M=...) must 1427# be used. 1428# 1429# The following are the only valid targets when building external 1430# modules. 1431# make M=dir clean Delete all automatically generated files 1432# make M=dir modules Make all modules in specified dir 1433# make M=dir Same as 'make M=dir modules' 1434# make M=dir modules_install 1435# Install the modules built in the module directory 1436# Assumes install directory is already created 1437 1438# We are always building modules 1439KBUILD_MODULES := 1 1440PHONY += crmodverdir 1441crmodverdir: 1442 $(cmd_crmodverdir) 1443 1444PHONY += $(objtree)/Module.symvers 1445$(objtree)/Module.symvers: 1446 @test -e $(objtree)/Module.symvers || ( \ 1447 echo; \ 1448 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \ 1449 echo " is missing; modules will have no dependencies and modversions."; \ 1450 echo ) 1451 1452module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD)) 1453PHONY += $(module-dirs) modules 1454$(module-dirs): crmodverdir $(objtree)/Module.symvers 1455 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@) 1456 1457modules: $(module-dirs) 1458 @$(kecho) ' Building modules, stage 2.'; 1459 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1460 1461PHONY += modules_install 1462modules_install: _emodinst_ _emodinst_post 1463 1464install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra) 1465PHONY += _emodinst_ 1466_emodinst_: 1467 $(Q)mkdir -p $(MODLIB)/$(install-dir) 1468 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1469 1470PHONY += _emodinst_post 1471_emodinst_post: _emodinst_ 1472 $(call cmd,depmod) 1473 1474clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD)) 1475 1476PHONY += $(clean-dirs) clean 1477$(clean-dirs): 1478 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1479 1480clean: rm-dirs := $(MODVERDIR) 1481clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers 1482 1483PHONY += help 1484help: 1485 @echo ' Building external modules.' 1486 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1487 @echo '' 1488 @echo ' modules - default target, build the module(s)' 1489 @echo ' modules_install - install the module' 1490 @echo ' clean - remove generated files in module directory only' 1491 @echo '' 1492 1493# Dummies... 1494PHONY += prepare scripts 1495prepare: ; 1496scripts: ; 1497endif # KBUILD_EXTMOD 1498 1499clean: $(clean-dirs) 1500 $(call cmd,rmdirs) 1501 $(call cmd,rmfiles) 1502 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1503 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \ 1504 -o -name '*.ko.*' \ 1505 -o -name '*.dwo' \ 1506 -o -name '*.su' \ 1507 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1508 -o -name '*.symtypes' -o -name 'modules.order' \ 1509 -o -name modules.builtin -o -name '.tmp_*.o.*' \ 1510 -o -name '*.gcno' \) -type f -print | xargs rm -f 1511 1512# Generate tags for editors 1513# --------------------------------------------------------------------------- 1514quiet_cmd_tags = GEN $@ 1515 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@ 1516 1517tags TAGS cscope gtags: FORCE 1518 $(call cmd,tags) 1519 1520# Scripts to check various things for consistency 1521# --------------------------------------------------------------------------- 1522 1523PHONY += includecheck versioncheck coccicheck namespacecheck export_report 1524 1525includecheck: 1526 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1527 -name '*.[hcS]' -type f -print | sort \ 1528 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1529 1530versioncheck: 1531 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1532 -name '*.[hcS]' -type f -print | sort \ 1533 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1534 1535coccicheck: 1536 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@ 1537 1538namespacecheck: 1539 $(PERL) $(srctree)/scripts/namespace.pl 1540 1541export_report: 1542 $(PERL) $(srctree)/scripts/export_report.pl 1543 1544endif #ifeq ($(config-targets),1) 1545endif #ifeq ($(mixed-targets),1) 1546 1547PHONY += checkstack kernelrelease kernelversion image_name 1548 1549# UML needs a little special treatment here. It wants to use the host 1550# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1551# else wants $(ARCH), including people doing cross-builds, which means 1552# that $(SUBARCH) doesn't work here. 1553ifeq ($(ARCH), um) 1554CHECKSTACK_ARCH := $(SUBARCH) 1555else 1556CHECKSTACK_ARCH := $(ARCH) 1557endif 1558checkstack: 1559 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1560 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1561 1562kernelrelease: 1563 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1564 1565kernelversion: 1566 @echo $(KERNELVERSION) 1567 1568image_name: 1569 @echo $(KBUILD_IMAGE) 1570 1571# Clear a bunch of variables before executing the submake 1572tools/: FORCE 1573 $(Q)mkdir -p $(objtree)/tools 1574 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/ 1575 1576tools/%: FORCE 1577 $(Q)mkdir -p $(objtree)/tools 1578 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/ $* 1579 1580# Single targets 1581# --------------------------------------------------------------------------- 1582# Single targets are compatible with: 1583# - build with mixed source and output 1584# - build with separate output dir 'make O=...' 1585# - external modules 1586# 1587# target-dir => where to store outputfile 1588# build-dir => directory in kernel source tree to use 1589 1590ifeq ($(KBUILD_EXTMOD),) 1591 build-dir = $(patsubst %/,%,$(dir $@)) 1592 target-dir = $(dir $@) 1593else 1594 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@))) 1595 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash)) 1596 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@)) 1597endif 1598 1599%.s: %.c prepare scripts FORCE 1600 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1601%.i: %.c prepare scripts FORCE 1602 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1603%.o: %.c prepare scripts FORCE 1604 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1605%.lst: %.c prepare scripts FORCE 1606 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1607%.s: %.S prepare scripts FORCE 1608 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1609%.o: %.S prepare scripts FORCE 1610 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1611%.symtypes: %.c prepare scripts FORCE 1612 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1613 1614# Modules 1615/: prepare scripts FORCE 1616 $(cmd_crmodverdir) 1617 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1618 $(build)=$(build-dir) 1619# Make sure the latest headers are built for Documentation 1620Documentation/: headers_install 1621%/: prepare scripts FORCE 1622 $(cmd_crmodverdir) 1623 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1624 $(build)=$(build-dir) 1625%.ko: prepare scripts FORCE 1626 $(cmd_crmodverdir) 1627 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1628 $(build)=$(build-dir) $(@:.ko=.o) 1629 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1630 1631# FIXME Should go into a make.lib or something 1632# =========================================================================== 1633 1634quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs))) 1635 cmd_rmdirs = rm -rf $(rm-dirs) 1636 1637quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1638 cmd_rmfiles = rm -f $(rm-files) 1639 1640# Run depmod only if we have System.map and depmod is executable 1641quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) 1642 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1643 $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))" 1644 1645# Create temporary dir for module support files 1646# clean it up only when building all modules 1647cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \ 1648 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*) 1649 1650# read all saved command lines 1651 1652targets := $(wildcard $(sort $(targets))) 1653cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd)) 1654 1655ifneq ($(cmd_files),) 1656 $(cmd_files): ; # Do not try to update included dependency files 1657 include $(cmd_files) 1658endif 1659 1660endif # skip-makefile 1661 1662PHONY += FORCE 1663FORCE: 1664 1665# Declare the contents of the .PHONY variable as phony. We keep that 1666# information in a variable so we can use it in if_changed and friends. 1667.PHONY: $(PHONY) 1668