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