1VERSION = 4 2PATCHLEVEL = 7 3SUBLEVEL = 0 4EXTRAVERSION = 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 $(CF) 366NOSTDINC_FLAGS = 367CFLAGS_MODULE = 368AFLAGS_MODULE = 369LDFLAGS_MODULE = 370CFLAGS_KERNEL = 371AFLAGS_KERNEL = 372LDFLAGS_vmlinux = 373CFLAGS_GCOV = -fprofile-arcs -ftest-coverage -fno-tree-loop-im -Wno-maybe-uninitialized 374CFLAGS_KCOV = -fsanitize-coverage=trace-pc 375 376 377# Use USERINCLUDE when you must reference the UAPI directories only. 378USERINCLUDE := \ 379 -I$(srctree)/arch/$(hdr-arch)/include/uapi \ 380 -Iarch/$(hdr-arch)/include/generated/uapi \ 381 -I$(srctree)/include/uapi \ 382 -Iinclude/generated/uapi \ 383 -include $(srctree)/include/linux/kconfig.h 384 385# Use LINUXINCLUDE when you must reference the include/ directory. 386# Needed to be compatible with the O= option 387LINUXINCLUDE := \ 388 -I$(srctree)/arch/$(hdr-arch)/include \ 389 -Iarch/$(hdr-arch)/include/generated/uapi \ 390 -Iarch/$(hdr-arch)/include/generated \ 391 $(if $(KBUILD_SRC), -I$(srctree)/include) \ 392 -Iinclude \ 393 $(USERINCLUDE) 394 395KBUILD_CPPFLAGS := -D__KERNEL__ 396 397KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \ 398 -fno-strict-aliasing -fno-common \ 399 -Werror-implicit-function-declaration \ 400 -Wno-format-security \ 401 -std=gnu89 402 403KBUILD_AFLAGS_KERNEL := 404KBUILD_CFLAGS_KERNEL := 405KBUILD_AFLAGS := -D__ASSEMBLY__ 406KBUILD_AFLAGS_MODULE := -DMODULE 407KBUILD_CFLAGS_MODULE := -DMODULE 408KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds 409 410# Read KERNELRELEASE from include/config/kernel.release (if it exists) 411KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null) 412KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 413 414export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 415export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC 416export CPP AR NM STRIP OBJCOPY OBJDUMP 417export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE 418export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS 419 420export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS 421export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV CFLAGS_KCOV CFLAGS_KASAN CFLAGS_UBSAN 422export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 423export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 424export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 425export KBUILD_ARFLAGS 426 427# When compiling out-of-tree modules, put MODVERDIR in the module 428# tree rather than in the kernel tree. The kernel tree might 429# even be read-only. 430export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions 431 432# Files to ignore in find ... statements 433 434export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 435 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 436 -prune -o 437export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 438 --exclude CVS --exclude .pc --exclude .hg --exclude .git 439 440# =========================================================================== 441# Rules shared between *config targets and build targets 442 443# Basic helpers built in scripts/ 444PHONY += scripts_basic 445scripts_basic: 446 $(Q)$(MAKE) $(build)=scripts/basic 447 $(Q)rm -f .tmp_quiet_recordmcount 448 449# To avoid any implicit rule to kick in, define an empty command. 450scripts/basic/%: scripts_basic ; 451 452PHONY += outputmakefile 453# outputmakefile generates a Makefile in the output directory, if using a 454# separate output directory. This allows convenient use of make in the 455# output directory. 456outputmakefile: 457ifneq ($(KBUILD_SRC),) 458 $(Q)ln -fsn $(srctree) source 459 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \ 460 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL) 461endif 462 463# Support for using generic headers in asm-generic 464PHONY += asm-generic 465asm-generic: 466 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \ 467 src=asm obj=arch/$(SRCARCH)/include/generated/asm 468 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \ 469 src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm 470 471# To make sure we do not include .config for any of the *config targets 472# catch them early, and hand them over to scripts/kconfig/Makefile 473# It is allowed to specify more targets when calling make, including 474# mixing *config targets and build targets. 475# For example 'make oldconfig all'. 476# Detect when mixed targets is specified, and make a second invocation 477# of make so .config is not included in this case either (for *config). 478 479version_h := include/generated/uapi/linux/version.h 480old_version_h := include/linux/version.h 481 482no-dot-config-targets := clean mrproper distclean \ 483 cscope gtags TAGS tags help% %docs check% coccicheck \ 484 $(version_h) headers_% archheaders archscripts \ 485 kernelversion %src-pkg 486 487config-targets := 0 488mixed-targets := 0 489dot-config := 1 490 491ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 492 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 493 dot-config := 0 494 endif 495endif 496 497ifeq ($(KBUILD_EXTMOD),) 498 ifneq ($(filter config %config,$(MAKECMDGOALS)),) 499 config-targets := 1 500 ifneq ($(words $(MAKECMDGOALS)),1) 501 mixed-targets := 1 502 endif 503 endif 504endif 505# install and module_install need also be processed one by one 506ifneq ($(filter install,$(MAKECMDGOALS)),) 507 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 508 mixed-targets := 1 509 endif 510endif 511 512ifeq ($(mixed-targets),1) 513# =========================================================================== 514# We're called with mixed targets (*config and build targets). 515# Handle them one by one. 516 517PHONY += $(MAKECMDGOALS) __build_one_by_one 518 519$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one 520 @: 521 522__build_one_by_one: 523 $(Q)set -e; \ 524 for i in $(MAKECMDGOALS); do \ 525 $(MAKE) -f $(srctree)/Makefile $$i; \ 526 done 527 528else 529ifeq ($(config-targets),1) 530# =========================================================================== 531# *config targets only - make sure prerequisites are updated, and descend 532# in scripts/kconfig to make the *config target 533 534# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 535# KBUILD_DEFCONFIG may point out an alternative default configuration 536# used for 'make defconfig' 537include arch/$(SRCARCH)/Makefile 538export KBUILD_DEFCONFIG KBUILD_KCONFIG 539 540config: scripts_basic outputmakefile FORCE 541 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 542 543%config: scripts_basic outputmakefile FORCE 544 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 545 546else 547# =========================================================================== 548# Build targets only - this includes vmlinux, arch specific targets, clean 549# targets and others. In general all targets except *config targets. 550 551ifeq ($(KBUILD_EXTMOD),) 552# Additional helpers built in scripts/ 553# Carefully list dependencies so we do not try to build scripts twice 554# in parallel 555PHONY += scripts 556scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \ 557 asm-generic 558 $(Q)$(MAKE) $(build)=$(@) 559 560# Objects we will link into vmlinux / subdirs we need to visit 561init-y := init/ 562drivers-y := drivers/ sound/ firmware/ 563net-y := net/ 564libs-y := lib/ 565core-y := usr/ 566virt-y := virt/ 567endif # KBUILD_EXTMOD 568 569ifeq ($(dot-config),1) 570# Read in config 571-include include/config/auto.conf 572 573ifeq ($(KBUILD_EXTMOD),) 574# Read in dependencies to all Kconfig* files, make sure to run 575# oldconfig if changes are detected. 576-include include/config/auto.conf.cmd 577 578# To avoid any implicit rule to kick in, define an empty command 579$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ; 580 581# If .config is newer than include/config/auto.conf, someone tinkered 582# with it and forgot to run make oldconfig. 583# if auto.conf.cmd is missing then we are probably in a cleaned tree so 584# we execute the config step to be sure to catch updated Kconfig files 585include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd 586 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig 587else 588# external modules needs include/generated/autoconf.h and include/config/auto.conf 589# but do not care if they are up-to-date. Use auto.conf to trigger the test 590PHONY += include/config/auto.conf 591 592include/config/auto.conf: 593 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 594 echo >&2; \ 595 echo >&2 " ERROR: Kernel configuration is invalid."; \ 596 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 597 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 598 echo >&2 ; \ 599 /bin/false) 600 601endif # KBUILD_EXTMOD 602 603else 604# Dummy target needed, because used as prerequisite 605include/config/auto.conf: ; 606endif # $(dot-config) 607 608# The all: target is the default when no target is given on the 609# command line. 610# This allow a user to issue only 'make' to build a kernel including modules 611# Defaults to vmlinux, but the arch makefile usually adds further targets 612all: vmlinux 613 614# The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default 615# values of the respective KBUILD_* variables 616ARCH_CPPFLAGS := 617ARCH_AFLAGS := 618ARCH_CFLAGS := 619include arch/$(SRCARCH)/Makefile 620 621KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,) 622 623ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 624KBUILD_CFLAGS += -Os $(call cc-disable-warning,maybe-uninitialized,) 625else 626ifdef CONFIG_PROFILE_ALL_BRANCHES 627KBUILD_CFLAGS += -O2 $(call cc-disable-warning,maybe-uninitialized,) 628else 629KBUILD_CFLAGS += -O2 630endif 631endif 632 633# Tell gcc to never replace conditional load with a non-conditional one 634KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 635 636ifdef CONFIG_READABLE_ASM 637# Disable optimizations that make assembler listings hard to read. 638# reorder blocks reorders the control in the function 639# ipa clone creates specialized cloned functions 640# partial inlining inlines only parts of functions 641KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \ 642 $(call cc-option,-fno-ipa-cp-clone,) \ 643 $(call cc-option,-fno-partial-inlining) 644endif 645 646ifneq ($(CONFIG_FRAME_WARN),0) 647KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN}) 648endif 649 650# Handle stack protector mode. 651# 652# Since kbuild can potentially perform two passes (first with the old 653# .config values and then with updated .config values), we cannot error out 654# if a desired compiler option is unsupported. If we were to error, kbuild 655# could never get to the second pass and actually notice that we changed 656# the option to something that was supported. 657# 658# Additionally, we don't want to fallback and/or silently change which compiler 659# flags will be used, since that leads to producing kernels with different 660# security feature characteristics depending on the compiler used. ("But I 661# selected CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!") 662# 663# The middle ground is to warn here so that the failed option is obvious, but 664# to let the build fail with bad compiler flags so that we can't produce a 665# kernel when there is a CONFIG and compiler mismatch. 666# 667ifdef CONFIG_CC_STACKPROTECTOR_REGULAR 668 stackp-flag := -fstack-protector 669 ifeq ($(call cc-option, $(stackp-flag)),) 670 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_REGULAR: \ 671 -fstack-protector not supported by compiler) 672 endif 673else 674ifdef CONFIG_CC_STACKPROTECTOR_STRONG 675 stackp-flag := -fstack-protector-strong 676 ifeq ($(call cc-option, $(stackp-flag)),) 677 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: \ 678 -fstack-protector-strong not supported by compiler) 679 endif 680else 681 # Force off for distro compilers that enable stack protector by default. 682 stackp-flag := $(call cc-option, -fno-stack-protector) 683endif 684endif 685KBUILD_CFLAGS += $(stackp-flag) 686 687ifdef CONFIG_KCOV 688 ifeq ($(call cc-option, $(CFLAGS_KCOV)),) 689 $(warning Cannot use CONFIG_KCOV: \ 690 -fsanitize-coverage=trace-pc is not supported by compiler) 691 CFLAGS_KCOV = 692 endif 693endif 694 695ifeq ($(cc-name),clang) 696KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,) 697KBUILD_CPPFLAGS += $(call cc-option,-Wno-unknown-warning-option,) 698KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable) 699KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier) 700KBUILD_CFLAGS += $(call cc-disable-warning, gnu) 701# Quiet clang warning: comparison of unsigned expression < 0 is always false 702KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare) 703# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the 704# source of a reference will be _MergedGlobals and not on of the whitelisted names. 705# See modpost pattern 2 706KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,) 707KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior) 708else 709 710# These warnings generated too much noise in a regular build. 711# Use make W=1 to enable them (see scripts/Makefile.build) 712KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable) 713KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) 714endif 715 716ifdef CONFIG_FRAME_POINTER 717KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 718else 719# Some targets (ARM with Thumb2, for example), can't be built with frame 720# pointers. For those, we don't have FUNCTION_TRACER automatically 721# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 722# incompatible with -fomit-frame-pointer with current GCC, so we don't use 723# -fomit-frame-pointer with FUNCTION_TRACER. 724ifndef CONFIG_FUNCTION_TRACER 725KBUILD_CFLAGS += -fomit-frame-pointer 726endif 727endif 728 729KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments) 730 731ifdef CONFIG_DEBUG_INFO 732ifdef CONFIG_DEBUG_INFO_SPLIT 733KBUILD_CFLAGS += $(call cc-option, -gsplit-dwarf, -g) 734else 735KBUILD_CFLAGS += -g 736endif 737KBUILD_AFLAGS += -Wa,-gdwarf-2 738endif 739ifdef CONFIG_DEBUG_INFO_DWARF4 740KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,) 741endif 742 743ifdef CONFIG_DEBUG_INFO_REDUCED 744KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \ 745 $(call cc-option,-fno-var-tracking) 746endif 747 748ifdef CONFIG_FUNCTION_TRACER 749ifndef CC_FLAGS_FTRACE 750CC_FLAGS_FTRACE := -pg 751endif 752export CC_FLAGS_FTRACE 753ifdef CONFIG_HAVE_FENTRY 754CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY) 755endif 756KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY) 757KBUILD_AFLAGS += $(CC_USING_FENTRY) 758ifdef CONFIG_DYNAMIC_FTRACE 759 ifdef CONFIG_HAVE_C_RECORDMCOUNT 760 BUILD_C_RECORDMCOUNT := y 761 export BUILD_C_RECORDMCOUNT 762 endif 763endif 764endif 765 766# We trigger additional mismatches with less inlining 767ifdef CONFIG_DEBUG_SECTION_MISMATCH 768KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) 769endif 770 771# arch Makefile may override CC so keep this after arch Makefile is included 772NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) 773CHECKFLAGS += $(NOSTDINC_FLAGS) 774 775# warn about C99 declaration after statement 776KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,) 777 778# disable pointer signed / unsigned warnings in gcc 4.0 779KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign) 780 781# disable invalid "can't wrap" optimizations for signed / pointers 782KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow) 783 784# conserve stack if available 785KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) 786 787# disallow errors like 'EXPORT_GPL(foo);' with missing header 788KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int) 789 790# require functions to have arguments in prototypes, not empty 'int foo()' 791KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes) 792 793# Prohibit date/time macros, which would make the build non-deterministic 794KBUILD_CFLAGS += $(call cc-option,-Werror=date-time) 795 796# enforce correct pointer usage 797KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 798 799# use the deterministic mode of AR if available 800KBUILD_ARFLAGS := $(call ar-option,D) 801 802# check for 'asm goto' 803ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y) 804 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO 805 KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO 806endif 807 808include scripts/Makefile.kasan 809include scripts/Makefile.extrawarn 810include scripts/Makefile.ubsan 811 812# Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the 813# last assignments 814KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS) 815KBUILD_AFLAGS += $(ARCH_AFLAGS) $(KAFLAGS) 816KBUILD_CFLAGS += $(ARCH_CFLAGS) $(KCFLAGS) 817 818# Use --build-id when available. 819LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\ 820 $(call cc-ldoption, -Wl$(comma)--build-id,)) 821KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID) 822LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID) 823 824ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 825LDFLAGS_vmlinux += $(call ld-option, -X,) 826endif 827 828# Default kernel image to build when no specific target is given. 829# KBUILD_IMAGE may be overruled on the command line or 830# set in the environment 831# Also any assignments in arch/$(ARCH)/Makefile take precedence over 832# this default value 833export KBUILD_IMAGE ?= vmlinux 834 835# 836# INSTALL_PATH specifies where to place the updated kernel and system map 837# images. Default is /boot, but you can set it to other values 838export INSTALL_PATH ?= /boot 839 840# 841# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 842# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 843# an argument if needed. Otherwise it defaults to the kernel install path 844# 845export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 846 847# 848# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 849# relocations required by build roots. This is not defined in the 850# makefile but the argument can be passed to make if needed. 851# 852 853MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 854export MODLIB 855 856# 857# INSTALL_MOD_STRIP, if defined, will cause modules to be 858# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then 859# the default option --strip-debug will be used. Otherwise, 860# INSTALL_MOD_STRIP value will be used as the options to the strip command. 861 862ifdef INSTALL_MOD_STRIP 863ifeq ($(INSTALL_MOD_STRIP),1) 864mod_strip_cmd = $(STRIP) --strip-debug 865else 866mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP) 867endif # INSTALL_MOD_STRIP=1 868else 869mod_strip_cmd = true 870endif # INSTALL_MOD_STRIP 871export mod_strip_cmd 872 873# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed 874# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP 875# or CONFIG_MODULE_COMPRESS_XZ. 876 877mod_compress_cmd = true 878ifdef CONFIG_MODULE_COMPRESS 879 ifdef CONFIG_MODULE_COMPRESS_GZIP 880 mod_compress_cmd = gzip -n -f 881 endif # CONFIG_MODULE_COMPRESS_GZIP 882 ifdef CONFIG_MODULE_COMPRESS_XZ 883 mod_compress_cmd = xz -f 884 endif # CONFIG_MODULE_COMPRESS_XZ 885endif # CONFIG_MODULE_COMPRESS 886export mod_compress_cmd 887 888# Select initial ramdisk compression format, default is gzip(1). 889# This shall be used by the dracut(8) tool while creating an initramfs image. 890# 891INITRD_COMPRESS-y := gzip 892INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2 893INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma 894INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz 895INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo 896INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4 897# do not export INITRD_COMPRESS, since we didn't actually 898# choose a sane default compression above. 899# export INITRD_COMPRESS := $(INITRD_COMPRESS-y) 900 901ifdef CONFIG_MODULE_SIG_ALL 902$(eval $(call config_filename,MODULE_SIG_KEY)) 903 904mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509 905else 906mod_sign_cmd = true 907endif 908export mod_sign_cmd 909 910 911ifeq ($(KBUILD_EXTMOD),) 912core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/ 913 914vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \ 915 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 916 $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y))) 917 918vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \ 919 $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-)))) 920 921init-y := $(patsubst %/, %/built-in.o, $(init-y)) 922core-y := $(patsubst %/, %/built-in.o, $(core-y)) 923drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y)) 924net-y := $(patsubst %/, %/built-in.o, $(net-y)) 925libs-y1 := $(patsubst %/, %/lib.a, $(libs-y)) 926libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y)) 927libs-y := $(libs-y1) $(libs-y2) 928virt-y := $(patsubst %/, %/built-in.o, $(virt-y)) 929 930# Externally visible symbols (used by link-vmlinux.sh) 931export KBUILD_VMLINUX_INIT := $(head-y) $(init-y) 932export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y) $(virt-y) 933export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 934export LDFLAGS_vmlinux 935# used by scripts/pacmage/Makefile 936export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools) 937 938vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) 939 940# Include targets which we want to execute sequentially if the rest of the 941# kernel build went well. If CONFIG_TRIM_UNUSED_KSYMS is set, this might be 942# evaluated more than once. 943PHONY += vmlinux_prereq 944vmlinux_prereq: $(vmlinux-deps) FORCE 945ifdef CONFIG_HEADERS_CHECK 946 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check 947endif 948ifdef CONFIG_BUILD_DOCSRC 949 $(Q)$(MAKE) $(build)=Documentation 950endif 951ifdef CONFIG_GDB_SCRIPTS 952 $(Q)ln -fsn `cd $(srctree) && /bin/pwd`/scripts/gdb/vmlinux-gdb.py 953endif 954ifdef CONFIG_TRIM_UNUSED_KSYMS 955 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ 956 "$(MAKE) KBUILD_MODULES=1 -f $(srctree)/Makefile vmlinux_prereq" 957endif 958 959# standalone target for easier testing 960include/generated/autoksyms.h: FORCE 961 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh true 962 963# Final link of vmlinux 964 cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) 965quiet_cmd_link-vmlinux = LINK $@ 966 967vmlinux: scripts/link-vmlinux.sh vmlinux_prereq $(vmlinux-deps) FORCE 968 +$(call if_changed,link-vmlinux) 969 970# Build samples along the rest of the kernel 971ifdef CONFIG_SAMPLES 972vmlinux-dirs += samples 973endif 974 975# The actual objects are generated when descending, 976# make sure no implicit rule kicks in 977$(sort $(vmlinux-deps)): $(vmlinux-dirs) ; 978 979# Handle descending into subdirectories listed in $(vmlinux-dirs) 980# Preset locale variables to speed up the build process. Limit locale 981# tweaks to this spot to avoid wrong language settings when running 982# make menuconfig etc. 983# Error messages still appears in the original language 984 985PHONY += $(vmlinux-dirs) 986$(vmlinux-dirs): prepare scripts 987 $(Q)$(MAKE) $(build)=$@ 988 989define filechk_kernel.release 990 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 991endef 992 993# Store (new) KERNELRELEASE string in include/config/kernel.release 994include/config/kernel.release: include/config/auto.conf FORCE 995 $(call filechk,kernel.release) 996 997 998# Things we need to do before we recursively start building the kernel 999# or the modules are listed in "prepare". 1000# A multi level approach is used. prepareN is processed before prepareN-1. 1001# archprepare is used in arch Makefiles and when processed asm symlink, 1002# version.h and scripts_basic is processed / created. 1003 1004# Listed in dependency order 1005PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3 1006 1007# prepare3 is used to check if we are building in a separate output directory, 1008# and if so do: 1009# 1) Check that make has not been executed in the kernel src $(srctree) 1010prepare3: include/config/kernel.release 1011ifneq ($(KBUILD_SRC),) 1012 @$(kecho) ' Using $(srctree) as source for kernel' 1013 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \ 1014 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \ 1015 echo >&2 " in the '$(srctree)' directory.";\ 1016 /bin/false; \ 1017 fi; 1018endif 1019 1020# prepare2 creates a makefile if using a separate output directory 1021prepare2: prepare3 outputmakefile asm-generic 1022 1023prepare1: prepare2 $(version_h) include/generated/utsrelease.h \ 1024 include/config/auto.conf 1025 $(cmd_crmodverdir) 1026 $(Q)test -e include/generated/autoksyms.h || \ 1027 touch include/generated/autoksyms.h 1028 1029archprepare: archheaders archscripts prepare1 scripts_basic 1030 1031prepare0: archprepare 1032 $(Q)$(MAKE) $(build)=. 1033 1034# All the preparing.. 1035prepare: prepare0 prepare-objtool 1036 1037ifdef CONFIG_STACK_VALIDATION 1038 has_libelf := $(call try-run,\ 1039 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0) 1040 ifeq ($(has_libelf),1) 1041 objtool_target := tools/objtool FORCE 1042 else 1043 $(warning "Cannot use CONFIG_STACK_VALIDATION, please install libelf-dev or elfutils-libelf-devel") 1044 SKIP_STACK_VALIDATION := 1 1045 export SKIP_STACK_VALIDATION 1046 endif 1047endif 1048 1049PHONY += prepare-objtool 1050prepare-objtool: $(objtool_target) 1051 1052# Generate some files 1053# --------------------------------------------------------------------------- 1054 1055# KERNELRELEASE can change from a few different places, meaning version.h 1056# needs to be updated, so this check is forced on all builds 1057 1058uts_len := 64 1059define filechk_utsrelease.h 1060 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1061 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1062 exit 1; \ 1063 fi; \ 1064 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";) 1065endef 1066 1067define filechk_version.h 1068 (echo \#define LINUX_VERSION_CODE $(shell \ 1069 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \ 1070 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';) 1071endef 1072 1073$(version_h): $(srctree)/Makefile FORCE 1074 $(call filechk,version.h) 1075 $(Q)rm -f $(old_version_h) 1076 1077include/generated/utsrelease.h: include/config/kernel.release FORCE 1078 $(call filechk,utsrelease.h) 1079 1080PHONY += headerdep 1081headerdep: 1082 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1083 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1084 1085# --------------------------------------------------------------------------- 1086# Firmware install 1087INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware 1088export INSTALL_FW_PATH 1089 1090PHONY += firmware_install 1091firmware_install: 1092 @mkdir -p $(objtree)/firmware 1093 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install 1094 1095# --------------------------------------------------------------------------- 1096# Kernel headers 1097 1098#Default location for installed headers 1099export INSTALL_HDR_PATH = $(objtree)/usr 1100 1101# If we do an all arch process set dst to asm-$(hdr-arch) 1102hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm) 1103 1104PHONY += archheaders 1105archheaders: 1106 1107PHONY += archscripts 1108archscripts: 1109 1110PHONY += __headers 1111__headers: $(version_h) scripts_basic asm-generic archheaders archscripts 1112 $(Q)$(MAKE) $(build)=scripts build_unifdef 1113 1114PHONY += headers_install_all 1115headers_install_all: 1116 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install 1117 1118PHONY += headers_install 1119headers_install: __headers 1120 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \ 1121 $(error Headers not exportable for the $(SRCARCH) architecture)) 1122 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1123 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) 1124 1125PHONY += headers_check_all 1126headers_check_all: headers_install_all 1127 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check 1128 1129PHONY += headers_check 1130headers_check: headers_install 1131 $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1 1132 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1 1133 1134# --------------------------------------------------------------------------- 1135# Kernel selftest 1136 1137PHONY += kselftest 1138kselftest: 1139 $(Q)$(MAKE) -C tools/testing/selftests run_tests 1140 1141kselftest-clean: 1142 $(Q)$(MAKE) -C tools/testing/selftests clean 1143 1144PHONY += kselftest-merge 1145kselftest-merge: 1146 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1147 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \ 1148 -m $(objtree)/.config \ 1149 $(srctree)/tools/testing/selftests/*/config 1150 +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1151 1152# --------------------------------------------------------------------------- 1153# Modules 1154 1155ifdef CONFIG_MODULES 1156 1157# By default, build modules as well 1158 1159all: modules 1160 1161# Build modules 1162# 1163# A module can be listed more than once in obj-m resulting in 1164# duplicate lines in modules.order files. Those are removed 1165# using awk while concatenating to the final file. 1166 1167PHONY += modules 1168modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin 1169 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order 1170 @$(kecho) ' Building modules, stage 2.'; 1171 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1172 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild 1173 1174modules.builtin: $(vmlinux-dirs:%=%/modules.builtin) 1175 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin 1176 1177%/modules.builtin: include/config/auto.conf 1178 $(Q)$(MAKE) $(modbuiltin)=$* 1179 1180 1181# Target to prepare building external modules 1182PHONY += modules_prepare 1183modules_prepare: prepare scripts 1184 1185# Target to install modules 1186PHONY += modules_install 1187modules_install: _modinst_ _modinst_post 1188 1189PHONY += _modinst_ 1190_modinst_: 1191 @rm -rf $(MODLIB)/kernel 1192 @rm -f $(MODLIB)/source 1193 @mkdir -p $(MODLIB)/kernel 1194 @ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source 1195 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1196 rm -f $(MODLIB)/build ; \ 1197 ln -s $(CURDIR) $(MODLIB)/build ; \ 1198 fi 1199 @cp -f $(objtree)/modules.order $(MODLIB)/ 1200 @cp -f $(objtree)/modules.builtin $(MODLIB)/ 1201 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1202 1203# This depmod is only for convenience to give the initial 1204# boot a modules.dep even before / is mounted read-write. However the 1205# boot script depmod is the master version. 1206PHONY += _modinst_post 1207_modinst_post: _modinst_ 1208 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst 1209 $(call cmd,depmod) 1210 1211ifeq ($(CONFIG_MODULE_SIG), y) 1212PHONY += modules_sign 1213modules_sign: 1214 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign 1215endif 1216 1217else # CONFIG_MODULES 1218 1219# Modules not configured 1220# --------------------------------------------------------------------------- 1221 1222PHONY += modules modules_install 1223modules modules_install: 1224 @echo >&2 1225 @echo >&2 "The present kernel configuration has modules disabled." 1226 @echo >&2 "Type 'make config' and enable loadable module support." 1227 @echo >&2 "Then build a kernel with module support enabled." 1228 @echo >&2 1229 @exit 1 1230 1231endif # CONFIG_MODULES 1232 1233### 1234# Cleaning is done on three levels. 1235# make clean Delete most generated files 1236# Leave enough to build external modules 1237# make mrproper Delete the current configuration, and all generated files 1238# make distclean Remove editor backup files, patch leftover files and the like 1239 1240# Directories & files removed with 'make clean' 1241CLEAN_DIRS += $(MODVERDIR) 1242 1243# Directories & files removed with 'make mrproper' 1244MRPROPER_DIRS += include/config usr/include include/generated \ 1245 arch/*/include/generated .tmp_objdiff 1246MRPROPER_FILES += .config .config.old .version .old_version \ 1247 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \ 1248 signing_key.pem signing_key.priv signing_key.x509 \ 1249 x509.genkey extra_certificates signing_key.x509.keyid \ 1250 signing_key.x509.signer vmlinux-gdb.py 1251 1252# clean - Delete most, but leave enough to build external modules 1253# 1254clean: rm-dirs := $(CLEAN_DIRS) 1255clean: rm-files := $(CLEAN_FILES) 1256clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples) 1257 1258PHONY += $(clean-dirs) clean archclean vmlinuxclean 1259$(clean-dirs): 1260 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1261 1262vmlinuxclean: 1263 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1264 1265clean: archclean vmlinuxclean 1266 1267# mrproper - Delete all generated files, including .config 1268# 1269mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS)) 1270mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1271mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts) 1272 1273PHONY += $(mrproper-dirs) mrproper archmrproper 1274$(mrproper-dirs): 1275 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1276 1277mrproper: clean archmrproper $(mrproper-dirs) 1278 $(call cmd,rmdirs) 1279 $(call cmd,rmfiles) 1280 1281# distclean 1282# 1283PHONY += distclean 1284 1285distclean: mrproper 1286 @find $(srctree) $(RCS_FIND_IGNORE) \ 1287 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1288 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \ 1289 -o -name '.*.rej' -o -name '*%' -o -name 'core' \) \ 1290 -type f -print | xargs rm -f 1291 1292 1293# Packaging of the kernel to various formats 1294# --------------------------------------------------------------------------- 1295# rpm target kept for backward compatibility 1296package-dir := scripts/package 1297 1298%src-pkg: FORCE 1299 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1300%pkg: include/config/kernel.release FORCE 1301 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1302rpm: include/config/kernel.release FORCE 1303 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1304 1305 1306# Brief documentation of the typical targets used 1307# --------------------------------------------------------------------------- 1308 1309boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1310boards := $(sort $(notdir $(boards))) 1311board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1312board-dirs := $(sort $(notdir $(board-dirs:/=))) 1313 1314PHONY += help 1315help: 1316 @echo 'Cleaning targets:' 1317 @echo ' clean - Remove most generated files but keep the config and' 1318 @echo ' enough build support to build external modules' 1319 @echo ' mrproper - Remove all generated files + config + various backup files' 1320 @echo ' distclean - mrproper + remove editor backup and patch files' 1321 @echo '' 1322 @echo 'Configuration targets:' 1323 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1324 @echo '' 1325 @echo 'Other generic targets:' 1326 @echo ' all - Build all targets marked with [*]' 1327 @echo '* vmlinux - Build the bare kernel' 1328 @echo '* modules - Build all modules' 1329 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1330 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH' 1331 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)' 1332 @echo ' dir/ - Build all files in dir and below' 1333 @echo ' dir/file.[ois] - Build specified target only' 1334 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1335 @echo ' (requires a recent binutils and recent build (System.map))' 1336 @echo ' dir/file.ko - Build module including final link' 1337 @echo ' modules_prepare - Set up for building external modules' 1338 @echo ' tags/TAGS - Generate tags file for editors' 1339 @echo ' cscope - Generate cscope index' 1340 @echo ' gtags - Generate GNU GLOBAL index' 1341 @echo ' kernelrelease - Output the release version string (use with make -s)' 1342 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1343 @echo ' image_name - Output the image name (use with make -s)' 1344 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1345 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1346 echo '' 1347 @echo 'Static analysers' 1348 @echo ' checkstack - Generate a list of stack hogs' 1349 @echo ' namespacecheck - Name space analysis on compiled kernel' 1350 @echo ' versioncheck - Sanity check on version.h usage' 1351 @echo ' includecheck - Check for duplicate included header files' 1352 @echo ' export_report - List the usages of all exported symbols' 1353 @echo ' headers_check - Sanity check on exported headers' 1354 @echo ' headerdep - Detect inclusion cycles in headers' 1355 @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help 1356 @echo '' 1357 @echo 'Kernel selftest' 1358 @echo ' kselftest - Build and run kernel selftest (run as root)' 1359 @echo ' Build, install, and boot kernel before' 1360 @echo ' running kselftest on it' 1361 @echo ' kselftest-clean - Remove all generated kselftest files' 1362 @echo ' kselftest-merge - Merge all the config dependencies of kselftest to existed' 1363 @echo ' .config.' 1364 @echo '' 1365 @echo 'Kernel packaging:' 1366 @$(MAKE) $(build)=$(package-dir) help 1367 @echo '' 1368 @echo 'Documentation targets:' 1369 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp 1370 @echo '' 1371 @echo 'Architecture specific targets ($(SRCARCH)):' 1372 @$(if $(archhelp),$(archhelp),\ 1373 echo ' No architecture specific help defined for $(SRCARCH)') 1374 @echo '' 1375 @$(if $(boards), \ 1376 $(foreach b, $(boards), \ 1377 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1378 echo '') 1379 @$(if $(board-dirs), \ 1380 $(foreach b, $(board-dirs), \ 1381 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1382 printf " %-16s - Show all of the above\\n" help-boards; \ 1383 echo '') 1384 1385 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1386 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1387 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1388 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)' 1389 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1390 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1391 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where' 1392 @echo ' 1: warnings which may be relevant and do not occur too often' 1393 @echo ' 2: warnings which occur quite often but may still be relevant' 1394 @echo ' 3: more obscure warnings, can most likely be ignored' 1395 @echo ' Multiple levels can be combined with W=12 or W=123' 1396 @echo '' 1397 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1398 @echo 'For further info see the ./README file' 1399 1400 1401help-board-dirs := $(addprefix help-,$(board-dirs)) 1402 1403help-boards: $(help-board-dirs) 1404 1405boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1406 1407$(help-board-dirs): help-%: 1408 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1409 @$(if $(boards-per-dir), \ 1410 $(foreach b, $(boards-per-dir), \ 1411 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1412 echo '') 1413 1414 1415# Documentation targets 1416# --------------------------------------------------------------------------- 1417%docs: scripts_basic FORCE 1418 $(Q)$(MAKE) $(build)=scripts build_docproc build_check-lc_ctype 1419 $(Q)$(MAKE) $(build)=Documentation/DocBook $@ 1420 1421else # KBUILD_EXTMOD 1422 1423### 1424# External module support. 1425# When building external modules the kernel used as basis is considered 1426# read-only, and no consistency checks are made and the make 1427# system is not used on the basis kernel. If updates are required 1428# in the basis kernel ordinary make commands (without M=...) must 1429# be used. 1430# 1431# The following are the only valid targets when building external 1432# modules. 1433# make M=dir clean Delete all automatically generated files 1434# make M=dir modules Make all modules in specified dir 1435# make M=dir Same as 'make M=dir modules' 1436# make M=dir modules_install 1437# Install the modules built in the module directory 1438# Assumes install directory is already created 1439 1440# We are always building modules 1441KBUILD_MODULES := 1 1442PHONY += crmodverdir 1443crmodverdir: 1444 $(cmd_crmodverdir) 1445 1446PHONY += $(objtree)/Module.symvers 1447$(objtree)/Module.symvers: 1448 @test -e $(objtree)/Module.symvers || ( \ 1449 echo; \ 1450 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \ 1451 echo " is missing; modules will have no dependencies and modversions."; \ 1452 echo ) 1453 1454module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD)) 1455PHONY += $(module-dirs) modules 1456$(module-dirs): crmodverdir $(objtree)/Module.symvers 1457 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@) 1458 1459modules: $(module-dirs) 1460 @$(kecho) ' Building modules, stage 2.'; 1461 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1462 1463PHONY += modules_install 1464modules_install: _emodinst_ _emodinst_post 1465 1466install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra) 1467PHONY += _emodinst_ 1468_emodinst_: 1469 $(Q)mkdir -p $(MODLIB)/$(install-dir) 1470 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1471 1472PHONY += _emodinst_post 1473_emodinst_post: _emodinst_ 1474 $(call cmd,depmod) 1475 1476clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD)) 1477 1478PHONY += $(clean-dirs) clean 1479$(clean-dirs): 1480 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1481 1482clean: rm-dirs := $(MODVERDIR) 1483clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers 1484 1485PHONY += help 1486help: 1487 @echo ' Building external modules.' 1488 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1489 @echo '' 1490 @echo ' modules - default target, build the module(s)' 1491 @echo ' modules_install - install the module' 1492 @echo ' clean - remove generated files in module directory only' 1493 @echo '' 1494 1495# Dummies... 1496PHONY += prepare scripts 1497prepare: ; 1498scripts: ; 1499endif # KBUILD_EXTMOD 1500 1501clean: $(clean-dirs) 1502 $(call cmd,rmdirs) 1503 $(call cmd,rmfiles) 1504 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1505 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \ 1506 -o -name '*.ko.*' \ 1507 -o -name '*.dwo' \ 1508 -o -name '*.su' \ 1509 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1510 -o -name '*.symtypes' -o -name 'modules.order' \ 1511 -o -name modules.builtin -o -name '.tmp_*.o.*' \ 1512 -o -name '*.gcno' \) -type f -print | xargs rm -f 1513 1514# Generate tags for editors 1515# --------------------------------------------------------------------------- 1516quiet_cmd_tags = GEN $@ 1517 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@ 1518 1519tags TAGS cscope gtags: FORCE 1520 $(call cmd,tags) 1521 1522# Scripts to check various things for consistency 1523# --------------------------------------------------------------------------- 1524 1525PHONY += includecheck versioncheck coccicheck namespacecheck export_report 1526 1527includecheck: 1528 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1529 -name '*.[hcS]' -type f -print | sort \ 1530 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1531 1532versioncheck: 1533 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1534 -name '*.[hcS]' -type f -print | sort \ 1535 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1536 1537coccicheck: 1538 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@ 1539 1540namespacecheck: 1541 $(PERL) $(srctree)/scripts/namespace.pl 1542 1543export_report: 1544 $(PERL) $(srctree)/scripts/export_report.pl 1545 1546endif #ifeq ($(config-targets),1) 1547endif #ifeq ($(mixed-targets),1) 1548 1549PHONY += checkstack kernelrelease kernelversion image_name 1550 1551# UML needs a little special treatment here. It wants to use the host 1552# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1553# else wants $(ARCH), including people doing cross-builds, which means 1554# that $(SUBARCH) doesn't work here. 1555ifeq ($(ARCH), um) 1556CHECKSTACK_ARCH := $(SUBARCH) 1557else 1558CHECKSTACK_ARCH := $(ARCH) 1559endif 1560checkstack: 1561 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1562 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1563 1564kernelrelease: 1565 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1566 1567kernelversion: 1568 @echo $(KERNELVERSION) 1569 1570image_name: 1571 @echo $(KBUILD_IMAGE) 1572 1573# Clear a bunch of variables before executing the submake 1574tools/: FORCE 1575 $(Q)mkdir -p $(objtree)/tools 1576 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/ 1577 1578tools/%: FORCE 1579 $(Q)mkdir -p $(objtree)/tools 1580 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/ $* 1581 1582# Single targets 1583# --------------------------------------------------------------------------- 1584# Single targets are compatible with: 1585# - build with mixed source and output 1586# - build with separate output dir 'make O=...' 1587# - external modules 1588# 1589# target-dir => where to store outputfile 1590# build-dir => directory in kernel source tree to use 1591 1592ifeq ($(KBUILD_EXTMOD),) 1593 build-dir = $(patsubst %/,%,$(dir $@)) 1594 target-dir = $(dir $@) 1595else 1596 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@))) 1597 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash)) 1598 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@)) 1599endif 1600 1601%.s: %.c prepare scripts FORCE 1602 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1603%.i: %.c prepare scripts FORCE 1604 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1605%.o: %.c prepare scripts FORCE 1606 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1607%.lst: %.c prepare scripts FORCE 1608 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1609%.s: %.S prepare scripts FORCE 1610 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1611%.o: %.S prepare scripts FORCE 1612 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1613%.symtypes: %.c prepare scripts FORCE 1614 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1615 1616# Modules 1617/: prepare scripts FORCE 1618 $(cmd_crmodverdir) 1619 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1620 $(build)=$(build-dir) 1621# Make sure the latest headers are built for Documentation 1622Documentation/: headers_install 1623%/: prepare scripts FORCE 1624 $(cmd_crmodverdir) 1625 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1626 $(build)=$(build-dir) 1627%.ko: prepare scripts FORCE 1628 $(cmd_crmodverdir) 1629 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1630 $(build)=$(build-dir) $(@:.ko=.o) 1631 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1632 1633# FIXME Should go into a make.lib or something 1634# =========================================================================== 1635 1636quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs))) 1637 cmd_rmdirs = rm -rf $(rm-dirs) 1638 1639quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1640 cmd_rmfiles = rm -f $(rm-files) 1641 1642# Run depmod only if we have System.map and depmod is executable 1643quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) 1644 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1645 $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))" 1646 1647# Create temporary dir for module support files 1648# clean it up only when building all modules 1649cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \ 1650 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*) 1651 1652# read all saved command lines 1653 1654targets := $(wildcard $(sort $(targets))) 1655cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd)) 1656 1657ifneq ($(cmd_files),) 1658 $(cmd_files): ; # Do not try to update included dependency files 1659 include $(cmd_files) 1660endif 1661 1662endif # skip-makefile 1663 1664PHONY += FORCE 1665FORCE: 1666 1667# Declare the contents of the .PHONY variable as phony. We keep that 1668# information in a variable so we can use it in if_changed and friends. 1669.PHONY: $(PHONY) 1670