1# SPDX-License-Identifier: GPL-2.0 2VERSION = 4 3PATCHLEVEL = 20 4SUBLEVEL = 0 5EXTRAVERSION = -rc1 6NAME = "People's Front" 7 8# *DOCUMENTATION* 9# To see a list of typical targets execute "make help" 10# More info can be located in ./README 11# Comments in this file are targeted only to the developer, do not 12# expect to learn how to build the kernel reading this file. 13 14# That's our default target when none is given on the command line 15PHONY := _all 16_all: 17 18# Do not use make's built-in rules and variables 19# (this increases performance and avoids hard-to-debug behaviour) 20MAKEFLAGS += -rR 21 22# Avoid funny character set dependencies 23unexport LC_ALL 24LC_COLLATE=C 25LC_NUMERIC=C 26export LC_COLLATE LC_NUMERIC 27 28# Avoid interference with shell env settings 29unexport GREP_OPTIONS 30 31# We are using a recursive build, so we need to do a little thinking 32# to get the ordering right. 33# 34# Most importantly: sub-Makefiles should only ever modify files in 35# their own directory. If in some directory we have a dependency on 36# a file in another dir (which doesn't happen often, but it's often 37# unavoidable when linking the built-in.a targets which finally 38# turn into vmlinux), we will call a sub make in that other dir, and 39# after that we are sure that everything which is in that other dir 40# is now up to date. 41# 42# The only cases where we need to modify files which have global 43# effects are thus separated out and done before the recursive 44# descending is started. They are now explicitly listed as the 45# prepare rule. 46 47# Beautify output 48# --------------------------------------------------------------------------- 49# 50# Normally, we echo the whole command before executing it. By making 51# that echo $($(quiet)$(cmd)), we now have the possibility to set 52# $(quiet) to choose other forms of output instead, e.g. 53# 54# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@ 55# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< 56# 57# If $(quiet) is empty, the whole command will be printed. 58# If it is set to "quiet_", only the short version will be printed. 59# If it is set to "silent_", nothing will be printed at all, since 60# the variable $(silent_cmd_cc_o_c) doesn't exist. 61# 62# A simple variant is to prefix commands with $(Q) - that's useful 63# for commands that shall be hidden in non-verbose mode. 64# 65# $(Q)ln $@ :< 66# 67# If KBUILD_VERBOSE equals 0 then the above command will be hidden. 68# If KBUILD_VERBOSE equals 1 then the above command is displayed. 69# 70# To put more focus on warnings, be less verbose as default 71# Use 'make V=1' to see the full commands 72 73ifeq ("$(origin V)", "command line") 74 KBUILD_VERBOSE = $(V) 75endif 76ifndef KBUILD_VERBOSE 77 KBUILD_VERBOSE = 0 78endif 79 80ifeq ($(KBUILD_VERBOSE),1) 81 quiet = 82 Q = 83else 84 quiet=quiet_ 85 Q = @ 86endif 87 88# If the user is running make -s (silent mode), suppress echoing of 89# commands 90 91ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),) 92 quiet=silent_ 93 tools_silent=s 94endif 95 96export quiet Q KBUILD_VERBOSE 97 98# kbuild supports saving output files in a separate directory. 99# To locate output files in a separate directory two syntaxes are supported. 100# In both cases the working directory must be the root of the kernel src. 101# 1) O= 102# Use "make O=dir/to/store/output/files/" 103# 104# 2) Set KBUILD_OUTPUT 105# Set the environment variable KBUILD_OUTPUT to point to the directory 106# where the output files shall be placed. 107# export KBUILD_OUTPUT=dir/to/store/output/files/ 108# make 109# 110# The O= assignment takes precedence over the KBUILD_OUTPUT environment 111# variable. 112 113# KBUILD_SRC is not intended to be used by the regular user (for now), 114# it is set on invocation of make with KBUILD_OUTPUT or O= specified. 115ifeq ($(KBUILD_SRC),) 116 117# OK, Make called in directory where kernel src resides 118# Do we want to locate output files in a separate directory? 119ifeq ("$(origin O)", "command line") 120 KBUILD_OUTPUT := $(O) 121endif 122 123# Cancel implicit rules on top Makefile 124$(CURDIR)/Makefile Makefile: ; 125 126ifneq ($(words $(subst :, ,$(CURDIR))), 1) 127 $(error main directory cannot contain spaces nor colons) 128endif 129 130ifneq ($(KBUILD_OUTPUT),) 131# check that the output directory actually exists 132saved-output := $(KBUILD_OUTPUT) 133KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \ 134 && pwd) 135$(if $(KBUILD_OUTPUT),, \ 136 $(error failed to create output directory "$(saved-output)")) 137 138# Look for make include files relative to root of kernel src 139# 140# This does not become effective immediately because MAKEFLAGS is re-parsed 141# once after the Makefile is read. It is OK since we are going to invoke 142# 'sub-make' below. 143MAKEFLAGS += --include-dir=$(CURDIR) 144 145PHONY += $(MAKECMDGOALS) sub-make 146 147$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make 148 @: 149 150# Invoke a second make in the output directory, passing relevant variables 151sub-make: 152 $(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \ 153 -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS)) 154 155# Leave processing to above invocation of make 156skip-makefile := 1 157endif # ifneq ($(KBUILD_OUTPUT),) 158endif # ifeq ($(KBUILD_SRC),) 159 160# We process the rest of the Makefile if this is the final invocation of make 161ifeq ($(skip-makefile),) 162 163# Do not print "Entering directory ...", 164# but we want to display it when entering to the output directory 165# so that IDEs/editors are able to understand relative filenames. 166MAKEFLAGS += --no-print-directory 167 168# Call a source code checker (by default, "sparse") as part of the 169# C compilation. 170# 171# Use 'make C=1' to enable checking of only re-compiled files. 172# Use 'make C=2' to enable checking of *all* source files, regardless 173# of whether they are re-compiled or not. 174# 175# See the file "Documentation/dev-tools/sparse.rst" for more details, 176# including where to get the "sparse" utility. 177 178ifeq ("$(origin C)", "command line") 179 KBUILD_CHECKSRC = $(C) 180endif 181ifndef KBUILD_CHECKSRC 182 KBUILD_CHECKSRC = 0 183endif 184 185# Use make M=dir to specify directory of external module to build 186# Old syntax make ... SUBDIRS=$PWD is still supported 187# Setting the environment variable KBUILD_EXTMOD take precedence 188ifdef SUBDIRS 189 KBUILD_EXTMOD ?= $(SUBDIRS) 190endif 191 192ifeq ("$(origin M)", "command line") 193 KBUILD_EXTMOD := $(M) 194endif 195 196ifeq ($(KBUILD_SRC),) 197 # building in the source tree 198 srctree := . 199else 200 ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR))) 201 # building in a subdirectory of the source tree 202 srctree := .. 203 else 204 srctree := $(KBUILD_SRC) 205 endif 206endif 207 208export KBUILD_CHECKSRC KBUILD_EXTMOD KBUILD_SRC 209 210objtree := . 211src := $(srctree) 212obj := $(objtree) 213 214VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD)) 215 216export srctree objtree VPATH 217 218# To make sure we do not include .config for any of the *config targets 219# catch them early, and hand them over to scripts/kconfig/Makefile 220# It is allowed to specify more targets when calling make, including 221# mixing *config targets and build targets. 222# For example 'make oldconfig all'. 223# Detect when mixed targets is specified, and make a second invocation 224# of make so .config is not included in this case either (for *config). 225 226version_h := include/generated/uapi/linux/version.h 227old_version_h := include/linux/version.h 228 229clean-targets := %clean mrproper cleandocs 230no-dot-config-targets := $(clean-targets) \ 231 cscope gtags TAGS tags help% %docs check% coccicheck \ 232 $(version_h) headers_% archheaders archscripts \ 233 %asm-generic kernelversion %src-pkg 234no-sync-config-targets := $(no-dot-config-targets) install %install \ 235 kernelrelease 236 237config-targets := 0 238mixed-targets := 0 239dot-config := 1 240may-sync-config := 1 241 242ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 243 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 244 dot-config := 0 245 endif 246endif 247 248ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),) 249 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),) 250 may-sync-config := 0 251 endif 252endif 253 254ifneq ($(KBUILD_EXTMOD),) 255 may-sync-config := 0 256endif 257 258ifeq ($(KBUILD_EXTMOD),) 259 ifneq ($(filter config %config,$(MAKECMDGOALS)),) 260 config-targets := 1 261 ifneq ($(words $(MAKECMDGOALS)),1) 262 mixed-targets := 1 263 endif 264 endif 265endif 266 267# For "make -j clean all", "make -j mrproper defconfig all", etc. 268ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),) 269 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) 270 mixed-targets := 1 271 endif 272endif 273 274# install and modules_install need also be processed one by one 275ifneq ($(filter install,$(MAKECMDGOALS)),) 276 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 277 mixed-targets := 1 278 endif 279endif 280 281ifeq ($(mixed-targets),1) 282# =========================================================================== 283# We're called with mixed targets (*config and build targets). 284# Handle them one by one. 285 286PHONY += $(MAKECMDGOALS) __build_one_by_one 287 288$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one 289 @: 290 291__build_one_by_one: 292 $(Q)set -e; \ 293 for i in $(MAKECMDGOALS); do \ 294 $(MAKE) -f $(srctree)/Makefile $$i; \ 295 done 296 297else 298 299# We need some generic definitions (do not try to remake the file). 300scripts/Kbuild.include: ; 301include scripts/Kbuild.include 302 303# Read KERNELRELEASE from include/config/kernel.release (if it exists) 304KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null) 305KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 306export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 307 308include scripts/subarch.include 309 310# Cross compiling and selecting different set of gcc/bin-utils 311# --------------------------------------------------------------------------- 312# 313# When performing cross compilation for other architectures ARCH shall be set 314# to the target architecture. (See arch/* for the possibilities). 315# ARCH can be set during invocation of make: 316# make ARCH=ia64 317# Another way is to have ARCH set in the environment. 318# The default ARCH is the host where make is executed. 319 320# CROSS_COMPILE specify the prefix used for all executables used 321# during compilation. Only gcc and related bin-utils executables 322# are prefixed with $(CROSS_COMPILE). 323# CROSS_COMPILE can be set on the command line 324# make CROSS_COMPILE=ia64-linux- 325# Alternatively CROSS_COMPILE can be set in the environment. 326# Default value for CROSS_COMPILE is not to prefix executables 327# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 328ARCH ?= $(SUBARCH) 329 330# Architecture as present in compile.h 331UTS_MACHINE := $(ARCH) 332SRCARCH := $(ARCH) 333 334# Additional ARCH settings for x86 335ifeq ($(ARCH),i386) 336 SRCARCH := x86 337endif 338ifeq ($(ARCH),x86_64) 339 SRCARCH := x86 340endif 341 342# Additional ARCH settings for sparc 343ifeq ($(ARCH),sparc32) 344 SRCARCH := sparc 345endif 346ifeq ($(ARCH),sparc64) 347 SRCARCH := sparc 348endif 349 350# Additional ARCH settings for sh 351ifeq ($(ARCH),sh64) 352 SRCARCH := sh 353endif 354 355KCONFIG_CONFIG ?= .config 356export KCONFIG_CONFIG 357 358# SHELL used by kbuild 359CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \ 360 else if [ -x /bin/bash ]; then echo /bin/bash; \ 361 else echo sh; fi ; fi) 362 363HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null) 364HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null) 365HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null) 366 367HOSTCC = gcc 368HOSTCXX = g++ 369KBUILD_HOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \ 370 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) \ 371 $(HOSTCFLAGS) 372KBUILD_HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) 373KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 374KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 375 376# Make variables (CC, etc...) 377AS = $(CROSS_COMPILE)as 378LD = $(CROSS_COMPILE)ld 379CC = $(CROSS_COMPILE)gcc 380CPP = $(CC) -E 381AR = $(CROSS_COMPILE)ar 382NM = $(CROSS_COMPILE)nm 383STRIP = $(CROSS_COMPILE)strip 384OBJCOPY = $(CROSS_COMPILE)objcopy 385OBJDUMP = $(CROSS_COMPILE)objdump 386LEX = flex 387YACC = bison 388AWK = awk 389GENKSYMS = scripts/genksyms/genksyms 390INSTALLKERNEL := installkernel 391DEPMOD = /sbin/depmod 392PERL = perl 393PYTHON = python 394PYTHON2 = python2 395PYTHON3 = python3 396CHECK = sparse 397 398CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 399 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 400NOSTDINC_FLAGS = 401CFLAGS_MODULE = 402AFLAGS_MODULE = 403LDFLAGS_MODULE = 404CFLAGS_KERNEL = 405AFLAGS_KERNEL = 406LDFLAGS_vmlinux = 407 408# Use USERINCLUDE when you must reference the UAPI directories only. 409USERINCLUDE := \ 410 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 411 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 412 -I$(srctree)/include/uapi \ 413 -I$(objtree)/include/generated/uapi \ 414 -include $(srctree)/include/linux/kconfig.h 415 416# Use LINUXINCLUDE when you must reference the include/ directory. 417# Needed to be compatible with the O= option 418LINUXINCLUDE := \ 419 -I$(srctree)/arch/$(SRCARCH)/include \ 420 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 421 $(if $(KBUILD_SRC), -I$(srctree)/include) \ 422 -I$(objtree)/include \ 423 $(USERINCLUDE) 424 425KBUILD_AFLAGS := -D__ASSEMBLY__ 426KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \ 427 -fno-strict-aliasing -fno-common -fshort-wchar \ 428 -Werror-implicit-function-declaration \ 429 -Wno-format-security \ 430 -std=gnu89 431KBUILD_CPPFLAGS := -D__KERNEL__ 432KBUILD_AFLAGS_KERNEL := 433KBUILD_CFLAGS_KERNEL := 434KBUILD_AFLAGS_MODULE := -DMODULE 435KBUILD_CFLAGS_MODULE := -DMODULE 436KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds 437KBUILD_LDFLAGS := 438GCC_PLUGINS_CFLAGS := 439 440export ARCH SRCARCH CONFIG_SHELL HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE AS LD CC 441export CPP AR NM STRIP OBJCOPY OBJDUMP KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS 442export MAKE LEX YACC AWK GENKSYMS INSTALLKERNEL PERL PYTHON PYTHON2 PYTHON3 UTS_MACHINE 443export HOSTCXX KBUILD_HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS 444 445export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 446export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 447export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN 448export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 449export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 450export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 451export KBUILD_ARFLAGS 452 453# When compiling out-of-tree modules, put MODVERDIR in the module 454# tree rather than in the kernel tree. The kernel tree might 455# even be read-only. 456export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions 457 458# Files to ignore in find ... statements 459 460export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 461 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 462 -prune -o 463export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 464 --exclude CVS --exclude .pc --exclude .hg --exclude .git 465 466# =========================================================================== 467# Rules shared between *config targets and build targets 468 469# Basic helpers built in scripts/basic/ 470PHONY += scripts_basic 471scripts_basic: 472 $(Q)$(MAKE) $(build)=scripts/basic 473 $(Q)rm -f .tmp_quiet_recordmcount 474 475# To avoid any implicit rule to kick in, define an empty command. 476scripts/basic/%: scripts_basic ; 477 478PHONY += outputmakefile 479# outputmakefile generates a Makefile in the output directory, if using a 480# separate output directory. This allows convenient use of make in the 481# output directory. 482outputmakefile: 483ifneq ($(KBUILD_SRC),) 484 $(Q)ln -fsn $(srctree) source 485 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree) 486endif 487 488ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),) 489ifneq ($(CROSS_COMPILE),) 490CLANG_TARGET := --target=$(notdir $(CROSS_COMPILE:%-=%)) 491GCC_TOOLCHAIN_DIR := $(dir $(shell which $(LD))) 492CLANG_PREFIX := --prefix=$(GCC_TOOLCHAIN_DIR) 493GCC_TOOLCHAIN := $(realpath $(GCC_TOOLCHAIN_DIR)/..) 494endif 495ifneq ($(GCC_TOOLCHAIN),) 496CLANG_GCC_TC := --gcc-toolchain=$(GCC_TOOLCHAIN) 497endif 498KBUILD_CFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC) $(CLANG_PREFIX) 499KBUILD_AFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC) $(CLANG_PREFIX) 500KBUILD_CFLAGS += $(call cc-option, -no-integrated-as) 501KBUILD_AFLAGS += $(call cc-option, -no-integrated-as) 502endif 503 504RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register 505RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register 506RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk 507RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline 508RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG))) 509RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG))) 510export RETPOLINE_CFLAGS 511export RETPOLINE_VDSO_CFLAGS 512 513KBUILD_CFLAGS += $(call cc-option,-fno-PIE) 514KBUILD_AFLAGS += $(call cc-option,-fno-PIE) 515 516# check for 'asm goto' 517ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y) 518 CC_HAVE_ASM_GOTO := 1 519 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO 520 KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO 521endif 522 523# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 524# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 525# CC_VERSION_TEXT is referenced from Kconfig (so it needs export), 526# and from include/config/auto.conf.cmd to detect the compiler upgrade. 527CC_VERSION_TEXT = $(shell $(CC) --version | head -n 1) 528 529ifeq ($(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 CC_VERSION_TEXT 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 $@ 545 546else 547# =========================================================================== 548# Build targets only - this includes vmlinux, arch specific targets, clean 549# targets and others. In general all targets except *config targets. 550 551# If building an external module we do not care about the all: rule 552# but instead _all depend on modules 553PHONY += all 554ifeq ($(KBUILD_EXTMOD),) 555_all: all 556else 557_all: modules 558endif 559 560# Decide whether to build built-in, modular, or both. 561# Normally, just do built-in. 562 563KBUILD_MODULES := 564KBUILD_BUILTIN := 1 565 566# If we have only "make modules", don't compile built-in objects. 567# When we're building modules with modversions, we need to consider 568# the built-in objects during the descend as well, in order to 569# make sure the checksums are up to date before we record them. 570 571ifeq ($(MAKECMDGOALS),modules) 572 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1) 573endif 574 575# If we have "make <whatever> modules", compile modules 576# in addition to whatever we do anyway. 577# Just "make" or "make all" shall build modules as well 578 579ifneq ($(filter all _all modules,$(MAKECMDGOALS)),) 580 KBUILD_MODULES := 1 581endif 582 583ifeq ($(MAKECMDGOALS),) 584 KBUILD_MODULES := 1 585endif 586 587export KBUILD_MODULES KBUILD_BUILTIN 588 589ifeq ($(KBUILD_EXTMOD),) 590# Objects we will link into vmlinux / subdirs we need to visit 591init-y := init/ 592drivers-y := drivers/ sound/ firmware/ 593net-y := net/ 594libs-y := lib/ 595core-y := usr/ 596virt-y := virt/ 597endif # KBUILD_EXTMOD 598 599ifeq ($(dot-config),1) 600include include/config/auto.conf 601endif 602 603# The all: target is the default when no target is given on the 604# command line. 605# This allow a user to issue only 'make' to build a kernel including modules 606# Defaults to vmlinux, but the arch makefile usually adds further targets 607all: vmlinux 608 609CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \ 610 $(call cc-option,-fno-tree-loop-im) \ 611 $(call cc-disable-warning,maybe-uninitialized,) 612export CFLAGS_GCOV 613 614# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 615ifdef CONFIG_FUNCTION_TRACER 616 CC_FLAGS_FTRACE := -pg 617endif 618 619# The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default 620# values of the respective KBUILD_* variables 621ARCH_CPPFLAGS := 622ARCH_AFLAGS := 623ARCH_CFLAGS := 624include arch/$(SRCARCH)/Makefile 625 626ifeq ($(dot-config),1) 627ifeq ($(may-sync-config),1) 628# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 629# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 630# because some architectures define CROSS_COMPILE there. 631-include include/config/auto.conf.cmd 632 633# To avoid any implicit rule to kick in, define an empty command 634$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ; 635 636# The actual configuration files used during the build are stored in 637# include/generated/ and include/config/. Update them if .config is newer than 638# include/config/auto.conf (which mirrors .config). 639include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd 640 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 641else 642# External modules and some install targets need include/generated/autoconf.h 643# and include/config/auto.conf but do not care if they are up-to-date. 644# Use auto.conf to trigger the test 645PHONY += include/config/auto.conf 646 647include/config/auto.conf: 648 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 649 echo >&2; \ 650 echo >&2 " ERROR: Kernel configuration is invalid."; \ 651 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 652 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 653 echo >&2 ; \ 654 /bin/false) 655 656endif # may-sync-config 657endif # $(dot-config) 658 659KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,) 660KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) 661KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) 662KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) 663KBUILD_CFLAGS += $(call cc-disable-warning, int-in-bool-context) 664 665ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 666KBUILD_CFLAGS += $(call cc-option,-Oz,-Os) 667KBUILD_CFLAGS += $(call cc-disable-warning,maybe-uninitialized,) 668else 669ifdef CONFIG_PROFILE_ALL_BRANCHES 670KBUILD_CFLAGS += -O2 $(call cc-disable-warning,maybe-uninitialized,) 671else 672KBUILD_CFLAGS += -O2 673endif 674endif 675 676KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \ 677 $(call cc-disable-warning,maybe-uninitialized,)) 678 679# Tell gcc to never replace conditional load with a non-conditional one 680KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 681 682include scripts/Makefile.kcov 683include scripts/Makefile.gcc-plugins 684 685ifdef CONFIG_READABLE_ASM 686# Disable optimizations that make assembler listings hard to read. 687# reorder blocks reorders the control in the function 688# ipa clone creates specialized cloned functions 689# partial inlining inlines only parts of functions 690KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \ 691 $(call cc-option,-fno-ipa-cp-clone,) \ 692 $(call cc-option,-fno-partial-inlining) 693endif 694 695ifneq ($(CONFIG_FRAME_WARN),0) 696KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN}) 697endif 698 699stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector 700stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 701stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 702 703KBUILD_CFLAGS += $(stackp-flags-y) 704 705ifdef CONFIG_CC_IS_CLANG 706KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,) 707KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier) 708KBUILD_CFLAGS += $(call cc-disable-warning, gnu) 709KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) 710# Quiet clang warning: comparison of unsigned expression < 0 is always false 711KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare) 712# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the 713# source of a reference will be _MergedGlobals and not on of the whitelisted names. 714# See modpost pattern 2 715KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,) 716KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior) 717else 718 719# These warnings generated too much noise in a regular build. 720# Use make W=1 to enable them (see scripts/Makefile.extrawarn) 721KBUILD_CFLAGS += -Wno-unused-but-set-variable 722endif 723 724KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) 725ifdef CONFIG_FRAME_POINTER 726KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 727else 728# Some targets (ARM with Thumb2, for example), can't be built with frame 729# pointers. For those, we don't have FUNCTION_TRACER automatically 730# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 731# incompatible with -fomit-frame-pointer with current GCC, so we don't use 732# -fomit-frame-pointer with FUNCTION_TRACER. 733ifndef CONFIG_FUNCTION_TRACER 734KBUILD_CFLAGS += -fomit-frame-pointer 735endif 736endif 737 738KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments) 739 740ifdef CONFIG_DEBUG_INFO 741ifdef CONFIG_DEBUG_INFO_SPLIT 742KBUILD_CFLAGS += $(call cc-option, -gsplit-dwarf, -g) 743else 744KBUILD_CFLAGS += -g 745endif 746KBUILD_AFLAGS += -Wa,-gdwarf-2 747endif 748ifdef CONFIG_DEBUG_INFO_DWARF4 749KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,) 750endif 751 752ifdef CONFIG_DEBUG_INFO_REDUCED 753KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \ 754 $(call cc-option,-fno-var-tracking) 755endif 756 757ifdef CONFIG_FUNCTION_TRACER 758ifdef CONFIG_FTRACE_MCOUNT_RECORD 759 # gcc 5 supports generating the mcount tables directly 760 ifeq ($(call cc-option-yn,-mrecord-mcount),y) 761 CC_FLAGS_FTRACE += -mrecord-mcount 762 export CC_USING_RECORD_MCOUNT := 1 763 endif 764 ifdef CONFIG_HAVE_NOP_MCOUNT 765 ifeq ($(call cc-option-yn, -mnop-mcount),y) 766 CC_FLAGS_FTRACE += -mnop-mcount 767 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 768 endif 769 endif 770endif 771ifdef CONFIG_HAVE_FENTRY 772 ifeq ($(call cc-option-yn, -mfentry),y) 773 CC_FLAGS_FTRACE += -mfentry 774 CC_FLAGS_USING += -DCC_USING_FENTRY 775 endif 776endif 777export CC_FLAGS_FTRACE 778KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 779KBUILD_AFLAGS += $(CC_FLAGS_USING) 780ifdef CONFIG_DYNAMIC_FTRACE 781 ifdef CONFIG_HAVE_C_RECORDMCOUNT 782 BUILD_C_RECORDMCOUNT := y 783 export BUILD_C_RECORDMCOUNT 784 endif 785endif 786endif 787 788# We trigger additional mismatches with less inlining 789ifdef CONFIG_DEBUG_SECTION_MISMATCH 790KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) 791endif 792 793ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 794KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 795LDFLAGS_vmlinux += --gc-sections 796endif 797 798# arch Makefile may override CC so keep this after arch Makefile is included 799NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) 800 801# warn about C99 declaration after statement 802KBUILD_CFLAGS += -Wdeclaration-after-statement 803 804# Variable Length Arrays (VLAs) should not be used anywhere in the kernel 805KBUILD_CFLAGS += $(call cc-option,-Wvla) 806 807# disable pointer signed / unsigned warnings in gcc 4.0 808KBUILD_CFLAGS += -Wno-pointer-sign 809 810# disable stringop warnings in gcc 8+ 811KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation) 812 813# disable invalid "can't wrap" optimizations for signed / pointers 814KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow) 815 816# clang sets -fmerge-all-constants by default as optimization, but this 817# is non-conforming behavior for C and in fact breaks the kernel, so we 818# need to disable it here generally. 819KBUILD_CFLAGS += $(call cc-option,-fno-merge-all-constants) 820 821# for gcc -fno-merge-all-constants disables everything, but it is fine 822# to have actual conforming behavior enabled. 823KBUILD_CFLAGS += $(call cc-option,-fmerge-constants) 824 825# Make sure -fstack-check isn't enabled (like gentoo apparently did) 826KBUILD_CFLAGS += $(call cc-option,-fno-stack-check,) 827 828# conserve stack if available 829KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) 830 831# disallow errors like 'EXPORT_GPL(foo);' with missing header 832KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int) 833 834# require functions to have arguments in prototypes, not empty 'int foo()' 835KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes) 836 837# Prohibit date/time macros, which would make the build non-deterministic 838KBUILD_CFLAGS += $(call cc-option,-Werror=date-time) 839 840# enforce correct pointer usage 841KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 842 843# Require designated initializers for all marked structures 844KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) 845 846# change __FILE__ to the relative path from the srctree 847KBUILD_CFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 848 849# use the deterministic mode of AR if available 850KBUILD_ARFLAGS := $(call ar-option,D) 851 852include scripts/Makefile.kasan 853include scripts/Makefile.extrawarn 854include scripts/Makefile.ubsan 855 856# Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the 857# last assignments 858KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS) 859KBUILD_AFLAGS += $(ARCH_AFLAGS) $(KAFLAGS) 860KBUILD_CFLAGS += $(ARCH_CFLAGS) $(KCFLAGS) 861 862# Use --build-id when available. 863LDFLAGS_BUILD_ID := $(call ld-option, --build-id) 864KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID) 865LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID) 866 867ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 868LDFLAGS_vmlinux += $(call ld-option, -X,) 869endif 870 871# insure the checker run with the right endianness 872CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 873 874# the checker needs the correct machine size 875CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 876 877# Default kernel image to build when no specific target is given. 878# KBUILD_IMAGE may be overruled on the command line or 879# set in the environment 880# Also any assignments in arch/$(ARCH)/Makefile take precedence over 881# this default value 882export KBUILD_IMAGE ?= vmlinux 883 884# 885# INSTALL_PATH specifies where to place the updated kernel and system map 886# images. Default is /boot, but you can set it to other values 887export INSTALL_PATH ?= /boot 888 889# 890# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 891# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 892# an argument if needed. Otherwise it defaults to the kernel install path 893# 894export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 895 896# 897# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 898# relocations required by build roots. This is not defined in the 899# makefile but the argument can be passed to make if needed. 900# 901 902MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 903export MODLIB 904 905# 906# INSTALL_MOD_STRIP, if defined, will cause modules to be 907# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then 908# the default option --strip-debug will be used. Otherwise, 909# INSTALL_MOD_STRIP value will be used as the options to the strip command. 910 911ifdef INSTALL_MOD_STRIP 912ifeq ($(INSTALL_MOD_STRIP),1) 913mod_strip_cmd = $(STRIP) --strip-debug 914else 915mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP) 916endif # INSTALL_MOD_STRIP=1 917else 918mod_strip_cmd = true 919endif # INSTALL_MOD_STRIP 920export mod_strip_cmd 921 922# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed 923# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP 924# or CONFIG_MODULE_COMPRESS_XZ. 925 926mod_compress_cmd = true 927ifdef CONFIG_MODULE_COMPRESS 928 ifdef CONFIG_MODULE_COMPRESS_GZIP 929 mod_compress_cmd = gzip -n -f 930 endif # CONFIG_MODULE_COMPRESS_GZIP 931 ifdef CONFIG_MODULE_COMPRESS_XZ 932 mod_compress_cmd = xz -f 933 endif # CONFIG_MODULE_COMPRESS_XZ 934endif # CONFIG_MODULE_COMPRESS 935export mod_compress_cmd 936 937# Select initial ramdisk compression format, default is gzip(1). 938# This shall be used by the dracut(8) tool while creating an initramfs image. 939# 940INITRD_COMPRESS-y := gzip 941INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2 942INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma 943INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz 944INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo 945INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4 946# do not export INITRD_COMPRESS, since we didn't actually 947# choose a sane default compression above. 948# export INITRD_COMPRESS := $(INITRD_COMPRESS-y) 949 950ifdef CONFIG_MODULE_SIG_ALL 951$(eval $(call config_filename,MODULE_SIG_KEY)) 952 953mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509 954else 955mod_sign_cmd = true 956endif 957export mod_sign_cmd 958 959ifdef CONFIG_STACK_VALIDATION 960 has_libelf := $(call try-run,\ 961 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0) 962 ifeq ($(has_libelf),1) 963 objtool_target := tools/objtool FORCE 964 else 965 ifdef CONFIG_UNWINDER_ORC 966 $(error "Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel") 967 else 968 $(warning "Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel") 969 endif 970 SKIP_STACK_VALIDATION := 1 971 export SKIP_STACK_VALIDATION 972 endif 973endif 974 975 976ifeq ($(KBUILD_EXTMOD),) 977core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/ 978 979vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \ 980 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 981 $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y))) 982 983vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \ 984 $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-)))) 985 986init-y := $(patsubst %/, %/built-in.a, $(init-y)) 987core-y := $(patsubst %/, %/built-in.a, $(core-y)) 988drivers-y := $(patsubst %/, %/built-in.a, $(drivers-y)) 989net-y := $(patsubst %/, %/built-in.a, $(net-y)) 990libs-y1 := $(patsubst %/, %/lib.a, $(libs-y)) 991libs-y2 := $(patsubst %/, %/built-in.a, $(filter-out %.a, $(libs-y))) 992virt-y := $(patsubst %/, %/built-in.a, $(virt-y)) 993 994# Externally visible symbols (used by link-vmlinux.sh) 995export KBUILD_VMLINUX_INIT := $(head-y) $(init-y) 996export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y2) $(drivers-y) $(net-y) $(virt-y) 997export KBUILD_VMLINUX_LIBS := $(libs-y1) 998export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 999export LDFLAGS_vmlinux 1000# used by scripts/package/Makefile 1001export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools) 1002 1003vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) $(KBUILD_VMLINUX_LIBS) 1004 1005# Recurse until adjust_autoksyms.sh is satisfied 1006PHONY += autoksyms_recursive 1007autoksyms_recursive: $(vmlinux-deps) 1008ifdef CONFIG_TRIM_UNUSED_KSYMS 1009 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ 1010 "$(MAKE) -f $(srctree)/Makefile vmlinux" 1011endif 1012 1013# For the kernel to actually contain only the needed exported symbols, 1014# we have to build modules as well to determine what those symbols are. 1015# (this can be evaluated only once include/config/auto.conf has been included) 1016ifdef CONFIG_TRIM_UNUSED_KSYMS 1017 KBUILD_MODULES := 1 1018endif 1019 1020autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h) 1021 1022$(autoksyms_h): 1023 $(Q)mkdir -p $(dir $@) 1024 $(Q)touch $@ 1025 1026ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink) 1027 1028# Final link of vmlinux with optional arch pass after final link 1029cmd_link-vmlinux = \ 1030 $(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ; \ 1031 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) 1032 1033vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE 1034ifdef CONFIG_HEADERS_CHECK 1035 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check 1036endif 1037ifdef CONFIG_GDB_SCRIPTS 1038 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1039endif 1040 +$(call if_changed,link-vmlinux) 1041 1042# Build samples along the rest of the kernel. This needs headers_install. 1043ifdef CONFIG_SAMPLES 1044vmlinux-dirs += samples 1045samples: headers_install 1046endif 1047 1048# The actual objects are generated when descending, 1049# make sure no implicit rule kicks in 1050$(sort $(vmlinux-deps)): $(vmlinux-dirs) ; 1051 1052# Handle descending into subdirectories listed in $(vmlinux-dirs) 1053# Preset locale variables to speed up the build process. Limit locale 1054# tweaks to this spot to avoid wrong language settings when running 1055# make menuconfig etc. 1056# Error messages still appears in the original language 1057 1058PHONY += $(vmlinux-dirs) 1059$(vmlinux-dirs): prepare scripts 1060 $(Q)$(MAKE) $(build)=$@ need-builtin=1 1061 1062define filechk_kernel.release 1063 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1064endef 1065 1066# Store (new) KERNELRELEASE string in include/config/kernel.release 1067include/config/kernel.release: $(srctree)/Makefile FORCE 1068 $(call filechk,kernel.release) 1069 1070# Additional helpers built in scripts/ 1071# Carefully list dependencies so we do not try to build scripts twice 1072# in parallel 1073PHONY += scripts 1074scripts: scripts_basic scripts_dtc asm-generic gcc-plugins $(autoksyms_h) 1075 $(Q)$(MAKE) $(build)=$(@) 1076 1077# Things we need to do before we recursively start building the kernel 1078# or the modules are listed in "prepare". 1079# A multi level approach is used. prepareN is processed before prepareN-1. 1080# archprepare is used in arch Makefiles and when processed asm symlink, 1081# version.h and scripts_basic is processed / created. 1082 1083# Listed in dependency order 1084PHONY += prepare archprepare macroprepare prepare0 prepare1 prepare2 prepare3 1085 1086# prepare3 is used to check if we are building in a separate output directory, 1087# and if so do: 1088# 1) Check that make has not been executed in the kernel src $(srctree) 1089prepare3: include/config/kernel.release 1090ifneq ($(KBUILD_SRC),) 1091 @$(kecho) ' Using $(srctree) as source for kernel' 1092 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \ 1093 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \ 1094 echo >&2 " in the '$(srctree)' directory.";\ 1095 /bin/false; \ 1096 fi; 1097endif 1098 1099# prepare2 creates a makefile if using a separate output directory. 1100# From this point forward, .config has been reprocessed, so any rules 1101# that need to depend on updated CONFIG_* values can be checked here. 1102prepare2: prepare3 outputmakefile asm-generic 1103 1104prepare1: prepare2 $(version_h) $(autoksyms_h) include/generated/utsrelease.h 1105 $(cmd_crmodverdir) 1106 1107macroprepare: prepare1 archmacros 1108 1109archprepare: archheaders archscripts macroprepare scripts_basic 1110 1111prepare0: archprepare gcc-plugins 1112 $(Q)$(MAKE) $(build)=. 1113 1114# All the preparing.. 1115prepare: prepare0 prepare-objtool 1116 1117# Support for using generic headers in asm-generic 1118PHONY += asm-generic uapi-asm-generic 1119asm-generic: uapi-asm-generic 1120 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \ 1121 src=asm obj=arch/$(SRCARCH)/include/generated/asm 1122uapi-asm-generic: 1123 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \ 1124 src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm 1125 1126PHONY += prepare-objtool 1127prepare-objtool: $(objtool_target) 1128 1129# Generate some files 1130# --------------------------------------------------------------------------- 1131 1132# KERNELRELEASE can change from a few different places, meaning version.h 1133# needs to be updated, so this check is forced on all builds 1134 1135uts_len := 64 1136define filechk_utsrelease.h 1137 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1138 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1139 exit 1; \ 1140 fi; \ 1141 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";) 1142endef 1143 1144define filechk_version.h 1145 (echo \#define LINUX_VERSION_CODE $(shell \ 1146 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \ 1147 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';) 1148endef 1149 1150$(version_h): FORCE 1151 $(call filechk,version.h) 1152 $(Q)rm -f $(old_version_h) 1153 1154include/generated/utsrelease.h: include/config/kernel.release FORCE 1155 $(call filechk,utsrelease.h) 1156 1157PHONY += headerdep 1158headerdep: 1159 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1160 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1161 1162# --------------------------------------------------------------------------- 1163# Kernel headers 1164 1165#Default location for installed headers 1166export INSTALL_HDR_PATH = $(objtree)/usr 1167 1168# If we do an all arch process set dst to include/arch-$(SRCARCH) 1169hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(SRCARCH), dst=include) 1170 1171PHONY += archheaders 1172archheaders: 1173 1174PHONY += archscripts 1175archscripts: 1176 1177PHONY += archmacros 1178archmacros: 1179 1180PHONY += __headers 1181__headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts 1182 $(Q)$(MAKE) $(build)=scripts build_unifdef 1183 1184PHONY += headers_install_all 1185headers_install_all: 1186 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install 1187 1188PHONY += headers_install 1189headers_install: __headers 1190 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \ 1191 $(error Headers not exportable for the $(SRCARCH) architecture)) 1192 $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include 1193 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) 1194 1195PHONY += headers_check_all 1196headers_check_all: headers_install_all 1197 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check 1198 1199PHONY += headers_check 1200headers_check: headers_install 1201 $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1 1202 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) HDRCHECK=1 1203 1204# --------------------------------------------------------------------------- 1205# Kernel selftest 1206 1207PHONY += kselftest 1208kselftest: 1209 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1210 1211PHONY += kselftest-clean 1212kselftest-clean: 1213 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean 1214 1215PHONY += kselftest-merge 1216kselftest-merge: 1217 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1218 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \ 1219 -m $(objtree)/.config \ 1220 $(srctree)/tools/testing/selftests/*/config 1221 +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1222 1223# --------------------------------------------------------------------------- 1224# Devicetree files 1225 1226ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1227dtstree := arch/$(SRCARCH)/boot/dts 1228endif 1229 1230ifneq ($(dtstree),) 1231 1232%.dtb: prepare3 scripts_dtc 1233 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1234 1235PHONY += dtbs dtbs_install 1236dtbs: prepare3 scripts_dtc 1237 $(Q)$(MAKE) $(build)=$(dtstree) 1238 1239dtbs_install: 1240 $(Q)$(MAKE) $(dtbinst)=$(dtstree) 1241 1242ifdef CONFIG_OF_EARLY_FLATTREE 1243all: dtbs 1244endif 1245 1246endif 1247 1248PHONY += scripts_dtc 1249scripts_dtc: scripts_basic 1250 $(Q)$(MAKE) $(build)=scripts/dtc 1251 1252# --------------------------------------------------------------------------- 1253# Modules 1254 1255ifdef CONFIG_MODULES 1256 1257# By default, build modules as well 1258 1259all: modules 1260 1261# Build modules 1262# 1263# A module can be listed more than once in obj-m resulting in 1264# duplicate lines in modules.order files. Those are removed 1265# using awk while concatenating to the final file. 1266 1267PHONY += modules 1268modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin 1269 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order 1270 @$(kecho) ' Building modules, stage 2.'; 1271 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1272 1273modules.builtin: $(vmlinux-dirs:%=%/modules.builtin) 1274 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin 1275 1276%/modules.builtin: include/config/auto.conf include/config/tristate.conf 1277 $(Q)$(MAKE) $(modbuiltin)=$* 1278 1279 1280# Target to prepare building external modules 1281PHONY += modules_prepare 1282modules_prepare: prepare scripts 1283 1284# Target to install modules 1285PHONY += modules_install 1286modules_install: _modinst_ _modinst_post 1287 1288PHONY += _modinst_ 1289_modinst_: 1290 @rm -rf $(MODLIB)/kernel 1291 @rm -f $(MODLIB)/source 1292 @mkdir -p $(MODLIB)/kernel 1293 @ln -s $(abspath $(srctree)) $(MODLIB)/source 1294 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1295 rm -f $(MODLIB)/build ; \ 1296 ln -s $(CURDIR) $(MODLIB)/build ; \ 1297 fi 1298 @cp -f $(objtree)/modules.order $(MODLIB)/ 1299 @cp -f $(objtree)/modules.builtin $(MODLIB)/ 1300 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1301 1302# This depmod is only for convenience to give the initial 1303# boot a modules.dep even before / is mounted read-write. However the 1304# boot script depmod is the master version. 1305PHONY += _modinst_post 1306_modinst_post: _modinst_ 1307 $(call cmd,depmod) 1308 1309ifeq ($(CONFIG_MODULE_SIG), y) 1310PHONY += modules_sign 1311modules_sign: 1312 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign 1313endif 1314 1315else # CONFIG_MODULES 1316 1317# Modules not configured 1318# --------------------------------------------------------------------------- 1319 1320PHONY += modules modules_install 1321modules modules_install: 1322 @echo >&2 1323 @echo >&2 "The present kernel configuration has modules disabled." 1324 @echo >&2 "Type 'make config' and enable loadable module support." 1325 @echo >&2 "Then build a kernel with module support enabled." 1326 @echo >&2 1327 @exit 1 1328 1329endif # CONFIG_MODULES 1330 1331### 1332# Cleaning is done on three levels. 1333# make clean Delete most generated files 1334# Leave enough to build external modules 1335# make mrproper Delete the current configuration, and all generated files 1336# make distclean Remove editor backup files, patch leftover files and the like 1337 1338# Directories & files removed with 'make clean' 1339CLEAN_DIRS += $(MODVERDIR) include/ksym 1340 1341# Directories & files removed with 'make mrproper' 1342MRPROPER_DIRS += include/config usr/include include/generated \ 1343 arch/*/include/generated .tmp_objdiff 1344MRPROPER_FILES += .config .config.old .version \ 1345 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \ 1346 signing_key.pem signing_key.priv signing_key.x509 \ 1347 x509.genkey extra_certificates signing_key.x509.keyid \ 1348 signing_key.x509.signer vmlinux-gdb.py 1349 1350# clean - Delete most, but leave enough to build external modules 1351# 1352clean: rm-dirs := $(CLEAN_DIRS) 1353clean: rm-files := $(CLEAN_FILES) 1354clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples) 1355 1356PHONY += $(clean-dirs) clean archclean vmlinuxclean 1357$(clean-dirs): 1358 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1359 1360vmlinuxclean: 1361 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1362 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1363 1364clean: archclean vmlinuxclean 1365 1366# mrproper - Delete all generated files, including .config 1367# 1368mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS)) 1369mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1370mrproper-dirs := $(addprefix _mrproper_,scripts) 1371 1372PHONY += $(mrproper-dirs) mrproper archmrproper 1373$(mrproper-dirs): 1374 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1375 1376mrproper: clean archmrproper $(mrproper-dirs) 1377 $(call cmd,rmdirs) 1378 $(call cmd,rmfiles) 1379 1380# distclean 1381# 1382PHONY += distclean 1383 1384distclean: mrproper 1385 @find $(srctree) $(RCS_FIND_IGNORE) \ 1386 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1387 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1388 -o -name 'core' \) \ 1389 -type f -print | xargs rm -f 1390 1391 1392# Packaging of the kernel to various formats 1393# --------------------------------------------------------------------------- 1394package-dir := scripts/package 1395 1396%src-pkg: FORCE 1397 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1398%pkg: include/config/kernel.release FORCE 1399 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1400 1401 1402# Brief documentation of the typical targets used 1403# --------------------------------------------------------------------------- 1404 1405boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1406boards := $(sort $(notdir $(boards))) 1407board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1408board-dirs := $(sort $(notdir $(board-dirs:/=))) 1409 1410PHONY += help 1411help: 1412 @echo 'Cleaning targets:' 1413 @echo ' clean - Remove most generated files but keep the config and' 1414 @echo ' enough build support to build external modules' 1415 @echo ' mrproper - Remove all generated files + config + various backup files' 1416 @echo ' distclean - mrproper + remove editor backup and patch files' 1417 @echo '' 1418 @echo 'Configuration targets:' 1419 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1420 @echo '' 1421 @echo 'Other generic targets:' 1422 @echo ' all - Build all targets marked with [*]' 1423 @echo '* vmlinux - Build the bare kernel' 1424 @echo '* modules - Build all modules' 1425 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1426 @echo ' dir/ - Build all files in dir and below' 1427 @echo ' dir/file.[ois] - Build specified target only' 1428 @echo ' dir/file.ll - Build the LLVM assembly file' 1429 @echo ' (requires compiler support for LLVM assembly generation)' 1430 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1431 @echo ' (requires a recent binutils and recent build (System.map))' 1432 @echo ' dir/file.ko - Build module including final link' 1433 @echo ' modules_prepare - Set up for building external modules' 1434 @echo ' tags/TAGS - Generate tags file for editors' 1435 @echo ' cscope - Generate cscope index' 1436 @echo ' gtags - Generate GNU GLOBAL index' 1437 @echo ' kernelrelease - Output the release version string (use with make -s)' 1438 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1439 @echo ' image_name - Output the image name (use with make -s)' 1440 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1441 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1442 echo '' 1443 @echo 'Static analysers:' 1444 @echo ' checkstack - Generate a list of stack hogs' 1445 @echo ' namespacecheck - Name space analysis on compiled kernel' 1446 @echo ' versioncheck - Sanity check on version.h usage' 1447 @echo ' includecheck - Check for duplicate included header files' 1448 @echo ' export_report - List the usages of all exported symbols' 1449 @echo ' headers_check - Sanity check on exported headers' 1450 @echo ' headerdep - Detect inclusion cycles in headers' 1451 @echo ' coccicheck - Check with Coccinelle' 1452 @echo '' 1453 @echo 'Kernel selftest:' 1454 @echo ' kselftest - Build and run kernel selftest (run as root)' 1455 @echo ' Build, install, and boot kernel before' 1456 @echo ' running kselftest on it' 1457 @echo ' kselftest-clean - Remove all generated kselftest files' 1458 @echo ' kselftest-merge - Merge all the config dependencies of kselftest to existing' 1459 @echo ' .config.' 1460 @echo '' 1461 @$(if $(dtstree), \ 1462 echo 'Devicetree:'; \ 1463 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1464 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1465 echo '') 1466 1467 @echo 'Userspace tools targets:' 1468 @echo ' use "make tools/help"' 1469 @echo ' or "cd tools; make help"' 1470 @echo '' 1471 @echo 'Kernel packaging:' 1472 @$(MAKE) $(build)=$(package-dir) help 1473 @echo '' 1474 @echo 'Documentation targets:' 1475 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1476 @echo '' 1477 @echo 'Architecture specific targets ($(SRCARCH)):' 1478 @$(if $(archhelp),$(archhelp),\ 1479 echo ' No architecture specific help defined for $(SRCARCH)') 1480 @echo '' 1481 @$(if $(boards), \ 1482 $(foreach b, $(boards), \ 1483 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1484 echo '') 1485 @$(if $(board-dirs), \ 1486 $(foreach b, $(board-dirs), \ 1487 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1488 printf " %-16s - Show all of the above\\n" help-boards; \ 1489 echo '') 1490 1491 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1492 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1493 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1494 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK (sparse by default)' 1495 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1496 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1497 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where' 1498 @echo ' 1: warnings which may be relevant and do not occur too often' 1499 @echo ' 2: warnings which occur quite often but may still be relevant' 1500 @echo ' 3: more obscure warnings, can most likely be ignored' 1501 @echo ' Multiple levels can be combined with W=12 or W=123' 1502 @echo '' 1503 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1504 @echo 'For further info see the ./README file' 1505 1506 1507help-board-dirs := $(addprefix help-,$(board-dirs)) 1508 1509help-boards: $(help-board-dirs) 1510 1511boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1512 1513$(help-board-dirs): help-%: 1514 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1515 @$(if $(boards-per-dir), \ 1516 $(foreach b, $(boards-per-dir), \ 1517 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1518 echo '') 1519 1520 1521# Documentation targets 1522# --------------------------------------------------------------------------- 1523DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1524 linkcheckdocs dochelp refcheckdocs 1525PHONY += $(DOC_TARGETS) 1526$(DOC_TARGETS): scripts_basic FORCE 1527 $(Q)$(MAKE) $(build)=Documentation $@ 1528 1529else # KBUILD_EXTMOD 1530 1531### 1532# External module support. 1533# When building external modules the kernel used as basis is considered 1534# read-only, and no consistency checks are made and the make 1535# system is not used on the basis kernel. If updates are required 1536# in the basis kernel ordinary make commands (without M=...) must 1537# be used. 1538# 1539# The following are the only valid targets when building external 1540# modules. 1541# make M=dir clean Delete all automatically generated files 1542# make M=dir modules Make all modules in specified dir 1543# make M=dir Same as 'make M=dir modules' 1544# make M=dir modules_install 1545# Install the modules built in the module directory 1546# Assumes install directory is already created 1547 1548# We are always building modules 1549KBUILD_MODULES := 1 1550PHONY += crmodverdir 1551crmodverdir: 1552 $(cmd_crmodverdir) 1553 1554PHONY += $(objtree)/Module.symvers 1555$(objtree)/Module.symvers: 1556 @test -e $(objtree)/Module.symvers || ( \ 1557 echo; \ 1558 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \ 1559 echo " is missing; modules will have no dependencies and modversions."; \ 1560 echo ) 1561 1562module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD)) 1563PHONY += $(module-dirs) modules 1564$(module-dirs): crmodverdir $(objtree)/Module.symvers 1565 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@) 1566 1567modules: $(module-dirs) 1568 @$(kecho) ' Building modules, stage 2.'; 1569 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1570 1571PHONY += modules_install 1572modules_install: _emodinst_ _emodinst_post 1573 1574install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra) 1575PHONY += _emodinst_ 1576_emodinst_: 1577 $(Q)mkdir -p $(MODLIB)/$(install-dir) 1578 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1579 1580PHONY += _emodinst_post 1581_emodinst_post: _emodinst_ 1582 $(call cmd,depmod) 1583 1584clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD)) 1585 1586PHONY += $(clean-dirs) clean 1587$(clean-dirs): 1588 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1589 1590clean: rm-dirs := $(MODVERDIR) 1591clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers 1592 1593PHONY += help 1594help: 1595 @echo ' Building external modules.' 1596 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1597 @echo '' 1598 @echo ' modules - default target, build the module(s)' 1599 @echo ' modules_install - install the module' 1600 @echo ' clean - remove generated files in module directory only' 1601 @echo '' 1602 1603# Dummies... 1604PHONY += prepare scripts 1605prepare: ; 1606scripts: ; 1607endif # KBUILD_EXTMOD 1608 1609clean: $(clean-dirs) 1610 $(call cmd,rmdirs) 1611 $(call cmd,rmfiles) 1612 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1613 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \ 1614 -o -name '*.ko.*' -o -name '*.dtb' -o -name '*.dtb.S' \ 1615 -o -name '*.dwo' -o -name '*.lst' \ 1616 -o -name '*.su' \ 1617 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1618 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 1619 -o -name '*.asn1.[ch]' \ 1620 -o -name '*.symtypes' -o -name 'modules.order' \ 1621 -o -name modules.builtin -o -name '.tmp_*.o.*' \ 1622 -o -name '*.c.[012]*.*' \ 1623 -o -name '*.ll' \ 1624 -o -name '*.gcno' \) -type f -print | xargs rm -f 1625 1626# Generate tags for editors 1627# --------------------------------------------------------------------------- 1628quiet_cmd_tags = GEN $@ 1629 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@ 1630 1631tags TAGS cscope gtags: FORCE 1632 $(call cmd,tags) 1633 1634# Scripts to check various things for consistency 1635# --------------------------------------------------------------------------- 1636 1637PHONY += includecheck versioncheck coccicheck namespacecheck export_report 1638 1639includecheck: 1640 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1641 -name '*.[hcS]' -type f -print | sort \ 1642 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1643 1644versioncheck: 1645 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1646 -name '*.[hcS]' -type f -print | sort \ 1647 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1648 1649coccicheck: 1650 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@ 1651 1652namespacecheck: 1653 $(PERL) $(srctree)/scripts/namespace.pl 1654 1655export_report: 1656 $(PERL) $(srctree)/scripts/export_report.pl 1657 1658PHONY += checkstack kernelrelease kernelversion image_name 1659 1660# UML needs a little special treatment here. It wants to use the host 1661# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1662# else wants $(ARCH), including people doing cross-builds, which means 1663# that $(SUBARCH) doesn't work here. 1664ifeq ($(ARCH), um) 1665CHECKSTACK_ARCH := $(SUBARCH) 1666else 1667CHECKSTACK_ARCH := $(ARCH) 1668endif 1669checkstack: 1670 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1671 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1672 1673kernelrelease: 1674 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1675 1676kernelversion: 1677 @echo $(KERNELVERSION) 1678 1679image_name: 1680 @echo $(KBUILD_IMAGE) 1681 1682# Clear a bunch of variables before executing the submake 1683tools/: FORCE 1684 $(Q)mkdir -p $(objtree)/tools 1685 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ 1686 1687tools/%: FORCE 1688 $(Q)mkdir -p $(objtree)/tools 1689 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $* 1690 1691# Single targets 1692# --------------------------------------------------------------------------- 1693# Single targets are compatible with: 1694# - build with mixed source and output 1695# - build with separate output dir 'make O=...' 1696# - external modules 1697# 1698# target-dir => where to store outputfile 1699# build-dir => directory in kernel source tree to use 1700 1701ifeq ($(KBUILD_EXTMOD),) 1702 build-dir = $(patsubst %/,%,$(dir $@)) 1703 target-dir = $(dir $@) 1704else 1705 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@))) 1706 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash)) 1707 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@)) 1708endif 1709 1710%.s: %.c prepare scripts FORCE 1711 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1712%.i: %.c prepare scripts FORCE 1713 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1714%.o: %.c prepare scripts FORCE 1715 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1716%.lst: %.c prepare scripts FORCE 1717 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1718%.s: %.S prepare scripts FORCE 1719 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1720%.o: %.S prepare scripts FORCE 1721 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1722%.symtypes: %.c prepare scripts FORCE 1723 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1724%.ll: %.c prepare scripts FORCE 1725 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1726 1727# Modules 1728/: prepare scripts FORCE 1729 $(cmd_crmodverdir) 1730 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1731 $(build)=$(build-dir) 1732# Make sure the latest headers are built for Documentation 1733Documentation/ samples/: headers_install 1734%/: prepare scripts FORCE 1735 $(cmd_crmodverdir) 1736 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1737 $(build)=$(build-dir) 1738%.ko: prepare scripts FORCE 1739 $(cmd_crmodverdir) 1740 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1741 $(build)=$(build-dir) $(@:.ko=.o) 1742 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1743 1744# FIXME Should go into a make.lib or something 1745# =========================================================================== 1746 1747quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs))) 1748 cmd_rmdirs = rm -rf $(rm-dirs) 1749 1750quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1751 cmd_rmfiles = rm -f $(rm-files) 1752 1753# Run depmod only if we have System.map and depmod is executable 1754quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) 1755 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1756 $(KERNELRELEASE) 1757 1758# Create temporary dir for module support files 1759# clean it up only when building all modules 1760cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \ 1761 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*) 1762 1763# read all saved command lines 1764cmd_files := $(wildcard .*.cmd) 1765 1766ifneq ($(cmd_files),) 1767 $(cmd_files): ; # Do not try to update included dependency files 1768 include $(cmd_files) 1769endif 1770 1771endif # ifeq ($(config-targets),1) 1772endif # ifeq ($(mixed-targets),1) 1773endif # skip-makefile 1774 1775PHONY += FORCE 1776FORCE: 1777 1778# Declare the contents of the PHONY variable as phony. We keep that 1779# information in a variable so we can use it in if_changed and friends. 1780.PHONY: $(PHONY) 1781