1# SPDX-License-Identifier: GPL-2.0 2VERSION = 4 3PATCHLEVEL = 19 4SUBLEVEL = 0 5EXTRAVERSION = -rc4 6NAME = Merciless Moray 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# o Do not use make's built-in rules and variables 19# (this increases performance and avoids hard-to-debug behaviour); 20# o Look for make include files relative to root of kernel src 21MAKEFLAGS += -rR --include-dir=$(CURDIR) 22 23# Avoid funny character set dependencies 24unexport LC_ALL 25LC_COLLATE=C 26LC_NUMERIC=C 27export LC_COLLATE LC_NUMERIC 28 29# Avoid interference with shell env settings 30unexport GREP_OPTIONS 31 32# We are using a recursive build, so we need to do a little thinking 33# to get the ordering right. 34# 35# Most importantly: sub-Makefiles should only ever modify files in 36# their own directory. If in some directory we have a dependency on 37# a file in another dir (which doesn't happen often, but it's often 38# unavoidable when linking the built-in.a targets which finally 39# turn into vmlinux), we will call a sub make in that other dir, and 40# after that we are sure that everything which is in that other dir 41# is now up to date. 42# 43# The only cases where we need to modify files which have global 44# effects are thus separated out and done before the recursive 45# descending is started. They are now explicitly listed as the 46# prepare rule. 47 48# Beautify output 49# --------------------------------------------------------------------------- 50# 51# Normally, we echo the whole command before executing it. By making 52# that echo $($(quiet)$(cmd)), we now have the possibility to set 53# $(quiet) to choose other forms of output instead, e.g. 54# 55# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@ 56# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< 57# 58# If $(quiet) is empty, the whole command will be printed. 59# If it is set to "quiet_", only the short version will be printed. 60# If it is set to "silent_", nothing will be printed at all, since 61# the variable $(silent_cmd_cc_o_c) doesn't exist. 62# 63# A simple variant is to prefix commands with $(Q) - that's useful 64# for commands that shall be hidden in non-verbose mode. 65# 66# $(Q)ln $@ :< 67# 68# If KBUILD_VERBOSE equals 0 then the above command will be hidden. 69# If KBUILD_VERBOSE equals 1 then the above command is displayed. 70# 71# To put more focus on warnings, be less verbose as default 72# Use 'make V=1' to see the full commands 73 74ifeq ("$(origin V)", "command line") 75 KBUILD_VERBOSE = $(V) 76endif 77ifndef KBUILD_VERBOSE 78 KBUILD_VERBOSE = 0 79endif 80 81ifeq ($(KBUILD_VERBOSE),1) 82 quiet = 83 Q = 84else 85 quiet=quiet_ 86 Q = @ 87endif 88 89# If the user is running make -s (silent mode), suppress echoing of 90# commands 91 92ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),) 93 quiet=silent_ 94 tools_silent=s 95endif 96 97export quiet Q KBUILD_VERBOSE 98 99# kbuild supports saving output files in a separate directory. 100# To locate output files in a separate directory two syntaxes are supported. 101# In both cases the working directory must be the root of the kernel src. 102# 1) O= 103# Use "make O=dir/to/store/output/files/" 104# 105# 2) Set KBUILD_OUTPUT 106# Set the environment variable KBUILD_OUTPUT to point to the directory 107# where the output files shall be placed. 108# export KBUILD_OUTPUT=dir/to/store/output/files/ 109# make 110# 111# The O= assignment takes precedence over the KBUILD_OUTPUT environment 112# variable. 113 114# KBUILD_SRC is not intended to be used by the regular user (for now), 115# it is set on invocation of make with KBUILD_OUTPUT or O= specified. 116ifeq ($(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 := $(O) 122endif 123 124# Cancel implicit rules on top Makefile 125$(CURDIR)/Makefile Makefile: ; 126 127ifneq ($(words $(subst :, ,$(CURDIR))), 1) 128 $(error main directory cannot contain spaces nor colons) 129endif 130 131ifneq ($(KBUILD_OUTPUT),) 132# check that the output directory actually exists 133saved-output := $(KBUILD_OUTPUT) 134KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \ 135 && pwd) 136$(if $(KBUILD_OUTPUT),, \ 137 $(error failed to create output directory "$(saved-output)")) 138 139PHONY += $(MAKECMDGOALS) sub-make 140 141$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make 142 @: 143 144# Invoke a second make in the output directory, passing relevant variables 145sub-make: 146 $(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \ 147 -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS)) 148 149# Leave processing to above invocation of make 150skip-makefile := 1 151endif # ifneq ($(KBUILD_OUTPUT),) 152endif # ifeq ($(KBUILD_SRC),) 153 154# We process the rest of the Makefile if this is the final invocation of make 155ifeq ($(skip-makefile),) 156 157# Do not print "Entering directory ...", 158# but we want to display it when entering to the output directory 159# so that IDEs/editors are able to understand relative filenames. 160MAKEFLAGS += --no-print-directory 161 162# Call a source code checker (by default, "sparse") as part of the 163# C compilation. 164# 165# Use 'make C=1' to enable checking of only re-compiled files. 166# Use 'make C=2' to enable checking of *all* source files, regardless 167# of whether they are re-compiled or not. 168# 169# See the file "Documentation/dev-tools/sparse.rst" for more details, 170# including where to get the "sparse" utility. 171 172ifeq ("$(origin C)", "command line") 173 KBUILD_CHECKSRC = $(C) 174endif 175ifndef KBUILD_CHECKSRC 176 KBUILD_CHECKSRC = 0 177endif 178 179# Use make M=dir to specify directory of external module to build 180# Old syntax make ... SUBDIRS=$PWD is still supported 181# Setting the environment variable KBUILD_EXTMOD take precedence 182ifdef SUBDIRS 183 KBUILD_EXTMOD ?= $(SUBDIRS) 184endif 185 186ifeq ("$(origin M)", "command line") 187 KBUILD_EXTMOD := $(M) 188endif 189 190ifeq ($(KBUILD_SRC),) 191 # building in the source tree 192 srctree := . 193else 194 ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR))) 195 # building in a subdirectory of the source tree 196 srctree := .. 197 else 198 srctree := $(KBUILD_SRC) 199 endif 200endif 201 202export KBUILD_CHECKSRC KBUILD_EXTMOD KBUILD_SRC 203 204objtree := . 205src := $(srctree) 206obj := $(objtree) 207 208VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD)) 209 210export srctree objtree VPATH 211 212# To make sure we do not include .config for any of the *config targets 213# catch them early, and hand them over to scripts/kconfig/Makefile 214# It is allowed to specify more targets when calling make, including 215# mixing *config targets and build targets. 216# For example 'make oldconfig all'. 217# Detect when mixed targets is specified, and make a second invocation 218# of make so .config is not included in this case either (for *config). 219 220version_h := include/generated/uapi/linux/version.h 221old_version_h := include/linux/version.h 222 223clean-targets := %clean mrproper cleandocs 224no-dot-config-targets := $(clean-targets) \ 225 cscope gtags TAGS tags help% %docs check% coccicheck \ 226 $(version_h) headers_% archheaders archscripts \ 227 %asm-generic kernelversion %src-pkg 228no-sync-config-targets := $(no-dot-config-targets) install %install \ 229 kernelrelease 230 231config-targets := 0 232mixed-targets := 0 233dot-config := 1 234may-sync-config := 1 235 236ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 237 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 238 dot-config := 0 239 endif 240endif 241 242ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),) 243 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),) 244 may-sync-config := 0 245 endif 246endif 247 248ifneq ($(KBUILD_EXTMOD),) 249 may-sync-config := 0 250endif 251 252ifeq ($(KBUILD_EXTMOD),) 253 ifneq ($(filter config %config,$(MAKECMDGOALS)),) 254 config-targets := 1 255 ifneq ($(words $(MAKECMDGOALS)),1) 256 mixed-targets := 1 257 endif 258 endif 259endif 260 261# For "make -j clean all", "make -j mrproper defconfig all", etc. 262ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),) 263 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) 264 mixed-targets := 1 265 endif 266endif 267 268# install and modules_install need also be processed one by one 269ifneq ($(filter install,$(MAKECMDGOALS)),) 270 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 271 mixed-targets := 1 272 endif 273endif 274 275ifeq ($(mixed-targets),1) 276# =========================================================================== 277# We're called with mixed targets (*config and build targets). 278# Handle them one by one. 279 280PHONY += $(MAKECMDGOALS) __build_one_by_one 281 282$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one 283 @: 284 285__build_one_by_one: 286 $(Q)set -e; \ 287 for i in $(MAKECMDGOALS); do \ 288 $(MAKE) -f $(srctree)/Makefile $$i; \ 289 done 290 291else 292 293# We need some generic definitions (do not try to remake the file). 294scripts/Kbuild.include: ; 295include scripts/Kbuild.include 296 297# Read KERNELRELEASE from include/config/kernel.release (if it exists) 298KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null) 299KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 300export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 301 302# SUBARCH tells the usermode build what the underlying arch is. That is set 303# first, and if a usermode build is happening, the "ARCH=um" on the command 304# line overrides the setting of ARCH below. If a native build is happening, 305# then ARCH is assigned, getting whatever value it gets normally, and 306# SUBARCH is subsequently ignored. 307 308SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \ 309 -e s/sun4u/sparc64/ \ 310 -e s/arm.*/arm/ -e s/sa110/arm/ \ 311 -e s/s390x/s390/ -e s/parisc64/parisc/ \ 312 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \ 313 -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ \ 314 -e s/riscv.*/riscv/) 315 316# Cross compiling and selecting different set of gcc/bin-utils 317# --------------------------------------------------------------------------- 318# 319# When performing cross compilation for other architectures ARCH shall be set 320# to the target architecture. (See arch/* for the possibilities). 321# ARCH can be set during invocation of make: 322# make ARCH=ia64 323# Another way is to have ARCH set in the environment. 324# The default ARCH is the host where make is executed. 325 326# CROSS_COMPILE specify the prefix used for all executables used 327# during compilation. Only gcc and related bin-utils executables 328# are prefixed with $(CROSS_COMPILE). 329# CROSS_COMPILE can be set on the command line 330# make CROSS_COMPILE=ia64-linux- 331# Alternatively CROSS_COMPILE can be set in the environment. 332# Default value for CROSS_COMPILE is not to prefix executables 333# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 334ARCH ?= $(SUBARCH) 335 336# Architecture as present in compile.h 337UTS_MACHINE := $(ARCH) 338SRCARCH := $(ARCH) 339 340# Additional ARCH settings for x86 341ifeq ($(ARCH),i386) 342 SRCARCH := x86 343endif 344ifeq ($(ARCH),x86_64) 345 SRCARCH := x86 346endif 347 348# Additional ARCH settings for sparc 349ifeq ($(ARCH),sparc32) 350 SRCARCH := sparc 351endif 352ifeq ($(ARCH),sparc64) 353 SRCARCH := sparc 354endif 355 356# Additional ARCH settings for sh 357ifeq ($(ARCH),sh64) 358 SRCARCH := sh 359endif 360 361KCONFIG_CONFIG ?= .config 362export KCONFIG_CONFIG 363 364# SHELL used by kbuild 365CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \ 366 else if [ -x /bin/bash ]; then echo /bin/bash; \ 367 else echo sh; fi ; fi) 368 369HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null) 370HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null) 371HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null) 372 373HOSTCC = gcc 374HOSTCXX = g++ 375KBUILD_HOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \ 376 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) \ 377 $(HOSTCFLAGS) 378KBUILD_HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) 379KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 380KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 381 382# Make variables (CC, etc...) 383AS = $(CROSS_COMPILE)as 384LD = $(CROSS_COMPILE)ld 385CC = $(CROSS_COMPILE)gcc 386CPP = $(CC) -E 387AR = $(CROSS_COMPILE)ar 388NM = $(CROSS_COMPILE)nm 389STRIP = $(CROSS_COMPILE)strip 390OBJCOPY = $(CROSS_COMPILE)objcopy 391OBJDUMP = $(CROSS_COMPILE)objdump 392LEX = flex 393YACC = bison 394AWK = awk 395GENKSYMS = scripts/genksyms/genksyms 396INSTALLKERNEL := installkernel 397DEPMOD = /sbin/depmod 398PERL = perl 399PYTHON = python 400PYTHON2 = python2 401PYTHON3 = python3 402CHECK = sparse 403 404CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 405 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 406NOSTDINC_FLAGS = 407CFLAGS_MODULE = 408AFLAGS_MODULE = 409LDFLAGS_MODULE = 410CFLAGS_KERNEL = 411AFLAGS_KERNEL = 412LDFLAGS_vmlinux = 413 414# Use USERINCLUDE when you must reference the UAPI directories only. 415USERINCLUDE := \ 416 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 417 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 418 -I$(srctree)/include/uapi \ 419 -I$(objtree)/include/generated/uapi \ 420 -include $(srctree)/include/linux/kconfig.h 421 422# Use LINUXINCLUDE when you must reference the include/ directory. 423# Needed to be compatible with the O= option 424LINUXINCLUDE := \ 425 -I$(srctree)/arch/$(SRCARCH)/include \ 426 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 427 $(if $(KBUILD_SRC), -I$(srctree)/include) \ 428 -I$(objtree)/include \ 429 $(USERINCLUDE) 430 431KBUILD_AFLAGS := -D__ASSEMBLY__ 432KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \ 433 -fno-strict-aliasing -fno-common -fshort-wchar \ 434 -Werror-implicit-function-declaration \ 435 -Wno-format-security \ 436 -std=gnu89 437KBUILD_CPPFLAGS := -D__KERNEL__ 438KBUILD_AFLAGS_KERNEL := 439KBUILD_CFLAGS_KERNEL := 440KBUILD_AFLAGS_MODULE := -DMODULE 441KBUILD_CFLAGS_MODULE := -DMODULE 442KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds 443KBUILD_LDFLAGS := 444GCC_PLUGINS_CFLAGS := 445 446export ARCH SRCARCH CONFIG_SHELL HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE AS LD CC 447export CPP AR NM STRIP OBJCOPY OBJDUMP KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS 448export MAKE LEX YACC AWK GENKSYMS INSTALLKERNEL PERL PYTHON PYTHON2 PYTHON3 UTS_MACHINE 449export HOSTCXX KBUILD_HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS 450 451export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 452export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 453export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN 454export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 455export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 456export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 457export KBUILD_ARFLAGS 458 459# When compiling out-of-tree modules, put MODVERDIR in the module 460# tree rather than in the kernel tree. The kernel tree might 461# even be read-only. 462export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions 463 464# Files to ignore in find ... statements 465 466export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 467 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 468 -prune -o 469export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 470 --exclude CVS --exclude .pc --exclude .hg --exclude .git 471 472# =========================================================================== 473# Rules shared between *config targets and build targets 474 475# Basic helpers built in scripts/basic/ 476PHONY += scripts_basic 477scripts_basic: 478 $(Q)$(MAKE) $(build)=scripts/basic 479 $(Q)rm -f .tmp_quiet_recordmcount 480 481# To avoid any implicit rule to kick in, define an empty command. 482scripts/basic/%: scripts_basic ; 483 484PHONY += outputmakefile 485# outputmakefile generates a Makefile in the output directory, if using a 486# separate output directory. This allows convenient use of make in the 487# output directory. 488outputmakefile: 489ifneq ($(KBUILD_SRC),) 490 $(Q)ln -fsn $(srctree) source 491 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \ 492 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL) 493endif 494 495ifeq ($(cc-name),clang) 496ifneq ($(CROSS_COMPILE),) 497CLANG_TARGET := --target=$(notdir $(CROSS_COMPILE:%-=%)) 498GCC_TOOLCHAIN := $(realpath $(dir $(shell which $(LD)))/..) 499endif 500ifneq ($(GCC_TOOLCHAIN),) 501CLANG_GCC_TC := --gcc-toolchain=$(GCC_TOOLCHAIN) 502endif 503KBUILD_CFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC) 504KBUILD_AFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC) 505KBUILD_CFLAGS += $(call cc-option, -no-integrated-as) 506KBUILD_AFLAGS += $(call cc-option, -no-integrated-as) 507endif 508 509RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register 510RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register 511RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk 512RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline 513RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG))) 514RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG))) 515export RETPOLINE_CFLAGS 516export RETPOLINE_VDSO_CFLAGS 517 518KBUILD_CFLAGS += $(call cc-option,-fno-PIE) 519KBUILD_AFLAGS += $(call cc-option,-fno-PIE) 520 521# check for 'asm goto' 522ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y) 523 CC_HAVE_ASM_GOTO := 1 524 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO 525 KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO 526endif 527 528# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 529# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 530# CC_VERSION_TEXT is referenced from Kconfig (so it needs export), 531# and from include/config/auto.conf.cmd to detect the compiler upgrade. 532CC_VERSION_TEXT = $(shell $(CC) --version | head -n 1) 533 534ifeq ($(config-targets),1) 535# =========================================================================== 536# *config targets only - make sure prerequisites are updated, and descend 537# in scripts/kconfig to make the *config target 538 539# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 540# KBUILD_DEFCONFIG may point out an alternative default configuration 541# used for 'make defconfig' 542include arch/$(SRCARCH)/Makefile 543export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT 544 545config: scripts_basic outputmakefile FORCE 546 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 547 548%config: scripts_basic outputmakefile FORCE 549 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 550 551else 552# =========================================================================== 553# Build targets only - this includes vmlinux, arch specific targets, clean 554# targets and others. In general all targets except *config targets. 555 556# If building an external module we do not care about the all: rule 557# but instead _all depend on modules 558PHONY += all 559ifeq ($(KBUILD_EXTMOD),) 560_all: all 561else 562_all: modules 563endif 564 565# Decide whether to build built-in, modular, or both. 566# Normally, just do built-in. 567 568KBUILD_MODULES := 569KBUILD_BUILTIN := 1 570 571# If we have only "make modules", don't compile built-in objects. 572# When we're building modules with modversions, we need to consider 573# the built-in objects during the descend as well, in order to 574# make sure the checksums are up to date before we record them. 575 576ifeq ($(MAKECMDGOALS),modules) 577 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1) 578endif 579 580# If we have "make <whatever> modules", compile modules 581# in addition to whatever we do anyway. 582# Just "make" or "make all" shall build modules as well 583 584ifneq ($(filter all _all modules,$(MAKECMDGOALS)),) 585 KBUILD_MODULES := 1 586endif 587 588ifeq ($(MAKECMDGOALS),) 589 KBUILD_MODULES := 1 590endif 591 592export KBUILD_MODULES KBUILD_BUILTIN 593 594ifeq ($(KBUILD_EXTMOD),) 595# Objects we will link into vmlinux / subdirs we need to visit 596init-y := init/ 597drivers-y := drivers/ sound/ firmware/ 598net-y := net/ 599libs-y := lib/ 600core-y := usr/ 601virt-y := virt/ 602endif # KBUILD_EXTMOD 603 604ifeq ($(dot-config),1) 605include include/config/auto.conf 606endif 607 608# The all: target is the default when no target is given on the 609# command line. 610# This allow a user to issue only 'make' to build a kernel including modules 611# Defaults to vmlinux, but the arch makefile usually adds further targets 612all: vmlinux 613 614CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \ 615 $(call cc-option,-fno-tree-loop-im) \ 616 $(call cc-disable-warning,maybe-uninitialized,) 617export CFLAGS_GCOV 618 619# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 620ifdef CONFIG_FUNCTION_TRACER 621 CC_FLAGS_FTRACE := -pg 622endif 623 624# The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default 625# values of the respective KBUILD_* variables 626ARCH_CPPFLAGS := 627ARCH_AFLAGS := 628ARCH_CFLAGS := 629include arch/$(SRCARCH)/Makefile 630 631ifeq ($(dot-config),1) 632ifeq ($(may-sync-config),1) 633# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 634# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 635# because some architectures define CROSS_COMPILE there. 636-include include/config/auto.conf.cmd 637 638# To avoid any implicit rule to kick in, define an empty command 639$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ; 640 641# The actual configuration files used during the build are stored in 642# include/generated/ and include/config/. Update them if .config is newer than 643# include/config/auto.conf (which mirrors .config). 644include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd 645 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 646else 647# External modules and some install targets need include/generated/autoconf.h 648# and include/config/auto.conf but do not care if they are up-to-date. 649# Use auto.conf to trigger the test 650PHONY += include/config/auto.conf 651 652include/config/auto.conf: 653 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 654 echo >&2; \ 655 echo >&2 " ERROR: Kernel configuration is invalid."; \ 656 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 657 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 658 echo >&2 ; \ 659 /bin/false) 660 661endif # may-sync-config 662endif # $(dot-config) 663 664KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,) 665KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) 666KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) 667KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) 668KBUILD_CFLAGS += $(call cc-disable-warning, int-in-bool-context) 669 670ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 671KBUILD_CFLAGS += $(call cc-option,-Oz,-Os) 672KBUILD_CFLAGS += $(call cc-disable-warning,maybe-uninitialized,) 673else 674ifdef CONFIG_PROFILE_ALL_BRANCHES 675KBUILD_CFLAGS += -O2 $(call cc-disable-warning,maybe-uninitialized,) 676else 677KBUILD_CFLAGS += -O2 678endif 679endif 680 681KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \ 682 $(call cc-disable-warning,maybe-uninitialized,)) 683 684# Tell gcc to never replace conditional load with a non-conditional one 685KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 686 687include scripts/Makefile.kcov 688include scripts/Makefile.gcc-plugins 689 690ifdef CONFIG_READABLE_ASM 691# Disable optimizations that make assembler listings hard to read. 692# reorder blocks reorders the control in the function 693# ipa clone creates specialized cloned functions 694# partial inlining inlines only parts of functions 695KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \ 696 $(call cc-option,-fno-ipa-cp-clone,) \ 697 $(call cc-option,-fno-partial-inlining) 698endif 699 700ifneq ($(CONFIG_FRAME_WARN),0) 701KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN}) 702endif 703 704stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector 705stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 706stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 707 708KBUILD_CFLAGS += $(stackp-flags-y) 709 710ifeq ($(cc-name),clang) 711KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,) 712KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier) 713KBUILD_CFLAGS += $(call cc-disable-warning, gnu) 714KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) 715# Quiet clang warning: comparison of unsigned expression < 0 is always false 716KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare) 717# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the 718# source of a reference will be _MergedGlobals and not on of the whitelisted names. 719# See modpost pattern 2 720KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,) 721KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior) 722else 723 724# These warnings generated too much noise in a regular build. 725# Use make W=1 to enable them (see scripts/Makefile.extrawarn) 726KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable) 727endif 728 729KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) 730ifdef CONFIG_FRAME_POINTER 731KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 732else 733# Some targets (ARM with Thumb2, for example), can't be built with frame 734# pointers. For those, we don't have FUNCTION_TRACER automatically 735# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 736# incompatible with -fomit-frame-pointer with current GCC, so we don't use 737# -fomit-frame-pointer with FUNCTION_TRACER. 738ifndef CONFIG_FUNCTION_TRACER 739KBUILD_CFLAGS += -fomit-frame-pointer 740endif 741endif 742 743KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments) 744 745ifdef CONFIG_DEBUG_INFO 746ifdef CONFIG_DEBUG_INFO_SPLIT 747KBUILD_CFLAGS += $(call cc-option, -gsplit-dwarf, -g) 748else 749KBUILD_CFLAGS += -g 750endif 751KBUILD_AFLAGS += -Wa,-gdwarf-2 752endif 753ifdef CONFIG_DEBUG_INFO_DWARF4 754KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,) 755endif 756 757ifdef CONFIG_DEBUG_INFO_REDUCED 758KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \ 759 $(call cc-option,-fno-var-tracking) 760endif 761 762ifdef CONFIG_FUNCTION_TRACER 763ifdef CONFIG_FTRACE_MCOUNT_RECORD 764 # gcc 5 supports generating the mcount tables directly 765 ifeq ($(call cc-option-yn,-mrecord-mcount),y) 766 CC_FLAGS_FTRACE += -mrecord-mcount 767 export CC_USING_RECORD_MCOUNT := 1 768 endif 769 ifdef CONFIG_HAVE_NOP_MCOUNT 770 ifeq ($(call cc-option-yn, -mnop-mcount),y) 771 CC_FLAGS_FTRACE += -mnop-mcount 772 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 773 endif 774 endif 775endif 776ifdef CONFIG_HAVE_FENTRY 777 ifeq ($(call cc-option-yn, -mfentry),y) 778 CC_FLAGS_FTRACE += -mfentry 779 CC_FLAGS_USING += -DCC_USING_FENTRY 780 endif 781endif 782export CC_FLAGS_FTRACE 783KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 784KBUILD_AFLAGS += $(CC_FLAGS_USING) 785ifdef CONFIG_DYNAMIC_FTRACE 786 ifdef CONFIG_HAVE_C_RECORDMCOUNT 787 BUILD_C_RECORDMCOUNT := y 788 export BUILD_C_RECORDMCOUNT 789 endif 790endif 791endif 792 793# We trigger additional mismatches with less inlining 794ifdef CONFIG_DEBUG_SECTION_MISMATCH 795KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) 796endif 797 798ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 799KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 800LDFLAGS_vmlinux += --gc-sections 801endif 802 803# arch Makefile may override CC so keep this after arch Makefile is included 804NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) 805 806# warn about C99 declaration after statement 807KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,) 808 809# disable pointer signed / unsigned warnings in gcc 4.0 810KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign) 811 812# disable stringop warnings in gcc 8+ 813KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation) 814 815# disable invalid "can't wrap" optimizations for signed / pointers 816KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow) 817 818# clang sets -fmerge-all-constants by default as optimization, but this 819# is non-conforming behavior for C and in fact breaks the kernel, so we 820# need to disable it here generally. 821KBUILD_CFLAGS += $(call cc-option,-fno-merge-all-constants) 822 823# for gcc -fno-merge-all-constants disables everything, but it is fine 824# to have actual conforming behavior enabled. 825KBUILD_CFLAGS += $(call cc-option,-fmerge-constants) 826 827# Make sure -fstack-check isn't enabled (like gentoo apparently did) 828KBUILD_CFLAGS += $(call cc-option,-fno-stack-check,) 829 830# conserve stack if available 831KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) 832 833# disallow errors like 'EXPORT_GPL(foo);' with missing header 834KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int) 835 836# require functions to have arguments in prototypes, not empty 'int foo()' 837KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes) 838 839# Prohibit date/time macros, which would make the build non-deterministic 840KBUILD_CFLAGS += $(call cc-option,-Werror=date-time) 841 842# enforce correct pointer usage 843KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 844 845# Require designated initializers for all marked structures 846KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) 847 848# change __FILE__ to the relative path from the srctree 849KBUILD_CFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 850 851# use the deterministic mode of AR if available 852KBUILD_ARFLAGS := $(call ar-option,D) 853 854include scripts/Makefile.kasan 855include scripts/Makefile.extrawarn 856include scripts/Makefile.ubsan 857 858# Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the 859# last assignments 860KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS) 861KBUILD_AFLAGS += $(ARCH_AFLAGS) $(KAFLAGS) 862KBUILD_CFLAGS += $(ARCH_CFLAGS) $(KCFLAGS) 863 864# Use --build-id when available. 865LDFLAGS_BUILD_ID := $(call ld-option, --build-id) 866KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID) 867LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID) 868 869ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 870LDFLAGS_vmlinux += $(call ld-option, -X,) 871endif 872 873# insure the checker run with the right endianness 874CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 875 876# the checker needs the correct machine size 877CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 878 879# Default kernel image to build when no specific target is given. 880# KBUILD_IMAGE may be overruled on the command line or 881# set in the environment 882# Also any assignments in arch/$(ARCH)/Makefile take precedence over 883# this default value 884export KBUILD_IMAGE ?= vmlinux 885 886# 887# INSTALL_PATH specifies where to place the updated kernel and system map 888# images. Default is /boot, but you can set it to other values 889export INSTALL_PATH ?= /boot 890 891# 892# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 893# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 894# an argument if needed. Otherwise it defaults to the kernel install path 895# 896export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 897 898# 899# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 900# relocations required by build roots. This is not defined in the 901# makefile but the argument can be passed to make if needed. 902# 903 904MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 905export MODLIB 906 907# 908# INSTALL_MOD_STRIP, if defined, will cause modules to be 909# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then 910# the default option --strip-debug will be used. Otherwise, 911# INSTALL_MOD_STRIP value will be used as the options to the strip command. 912 913ifdef INSTALL_MOD_STRIP 914ifeq ($(INSTALL_MOD_STRIP),1) 915mod_strip_cmd = $(STRIP) --strip-debug 916else 917mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP) 918endif # INSTALL_MOD_STRIP=1 919else 920mod_strip_cmd = true 921endif # INSTALL_MOD_STRIP 922export mod_strip_cmd 923 924# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed 925# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP 926# or CONFIG_MODULE_COMPRESS_XZ. 927 928mod_compress_cmd = true 929ifdef CONFIG_MODULE_COMPRESS 930 ifdef CONFIG_MODULE_COMPRESS_GZIP 931 mod_compress_cmd = gzip -n -f 932 endif # CONFIG_MODULE_COMPRESS_GZIP 933 ifdef CONFIG_MODULE_COMPRESS_XZ 934 mod_compress_cmd = xz -f 935 endif # CONFIG_MODULE_COMPRESS_XZ 936endif # CONFIG_MODULE_COMPRESS 937export mod_compress_cmd 938 939# Select initial ramdisk compression format, default is gzip(1). 940# This shall be used by the dracut(8) tool while creating an initramfs image. 941# 942INITRD_COMPRESS-y := gzip 943INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2 944INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma 945INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz 946INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo 947INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4 948# do not export INITRD_COMPRESS, since we didn't actually 949# choose a sane default compression above. 950# export INITRD_COMPRESS := $(INITRD_COMPRESS-y) 951 952ifdef CONFIG_MODULE_SIG_ALL 953$(eval $(call config_filename,MODULE_SIG_KEY)) 954 955mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509 956else 957mod_sign_cmd = true 958endif 959export mod_sign_cmd 960 961ifdef CONFIG_STACK_VALIDATION 962 has_libelf := $(call try-run,\ 963 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0) 964 ifeq ($(has_libelf),1) 965 objtool_target := tools/objtool FORCE 966 else 967 ifdef CONFIG_UNWINDER_ORC 968 $(error "Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel") 969 else 970 $(warning "Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel") 971 endif 972 SKIP_STACK_VALIDATION := 1 973 export SKIP_STACK_VALIDATION 974 endif 975endif 976 977 978ifeq ($(KBUILD_EXTMOD),) 979core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/ 980 981vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \ 982 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 983 $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y))) 984 985vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \ 986 $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-)))) 987 988init-y := $(patsubst %/, %/built-in.a, $(init-y)) 989core-y := $(patsubst %/, %/built-in.a, $(core-y)) 990drivers-y := $(patsubst %/, %/built-in.a, $(drivers-y)) 991net-y := $(patsubst %/, %/built-in.a, $(net-y)) 992libs-y1 := $(patsubst %/, %/lib.a, $(libs-y)) 993libs-y2 := $(patsubst %/, %/built-in.a, $(filter-out %.a, $(libs-y))) 994virt-y := $(patsubst %/, %/built-in.a, $(virt-y)) 995 996# Externally visible symbols (used by link-vmlinux.sh) 997export KBUILD_VMLINUX_INIT := $(head-y) $(init-y) 998export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y2) $(drivers-y) $(net-y) $(virt-y) 999export KBUILD_VMLINUX_LIBS := $(libs-y1) 1000export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1001export LDFLAGS_vmlinux 1002# used by scripts/package/Makefile 1003export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools) 1004 1005vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) $(KBUILD_VMLINUX_LIBS) 1006 1007# Recurse until adjust_autoksyms.sh is satisfied 1008PHONY += autoksyms_recursive 1009autoksyms_recursive: $(vmlinux-deps) 1010ifdef CONFIG_TRIM_UNUSED_KSYMS 1011 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ 1012 "$(MAKE) -f $(srctree)/Makefile vmlinux" 1013endif 1014 1015# For the kernel to actually contain only the needed exported symbols, 1016# we have to build modules as well to determine what those symbols are. 1017# (this can be evaluated only once include/config/auto.conf has been included) 1018ifdef CONFIG_TRIM_UNUSED_KSYMS 1019 KBUILD_MODULES := 1 1020endif 1021 1022autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h) 1023 1024$(autoksyms_h): 1025 $(Q)mkdir -p $(dir $@) 1026 $(Q)touch $@ 1027 1028ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink) 1029 1030# Final link of vmlinux with optional arch pass after final link 1031cmd_link-vmlinux = \ 1032 $(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ; \ 1033 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) 1034 1035vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE 1036ifdef CONFIG_HEADERS_CHECK 1037 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check 1038endif 1039ifdef CONFIG_GDB_SCRIPTS 1040 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1041endif 1042 +$(call if_changed,link-vmlinux) 1043 1044# Build samples along the rest of the kernel. This needs headers_install. 1045ifdef CONFIG_SAMPLES 1046vmlinux-dirs += samples 1047samples: headers_install 1048endif 1049 1050# The actual objects are generated when descending, 1051# make sure no implicit rule kicks in 1052$(sort $(vmlinux-deps)): $(vmlinux-dirs) ; 1053 1054# Handle descending into subdirectories listed in $(vmlinux-dirs) 1055# Preset locale variables to speed up the build process. Limit locale 1056# tweaks to this spot to avoid wrong language settings when running 1057# make menuconfig etc. 1058# Error messages still appears in the original language 1059 1060PHONY += $(vmlinux-dirs) 1061$(vmlinux-dirs): prepare scripts 1062 $(Q)$(MAKE) $(build)=$@ need-builtin=1 1063 1064define filechk_kernel.release 1065 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1066endef 1067 1068# Store (new) KERNELRELEASE string in include/config/kernel.release 1069include/config/kernel.release: $(srctree)/Makefile FORCE 1070 $(call filechk,kernel.release) 1071 1072# Additional helpers built in scripts/ 1073# Carefully list dependencies so we do not try to build scripts twice 1074# in parallel 1075PHONY += scripts 1076scripts: scripts_basic asm-generic gcc-plugins $(autoksyms_h) 1077 $(Q)$(MAKE) $(build)=$(@) 1078 1079# Things we need to do before we recursively start building the kernel 1080# or the modules are listed in "prepare". 1081# A multi level approach is used. prepareN is processed before prepareN-1. 1082# archprepare is used in arch Makefiles and when processed asm symlink, 1083# version.h and scripts_basic is processed / created. 1084 1085# Listed in dependency order 1086PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3 1087 1088# prepare3 is used to check if we are building in a separate output directory, 1089# and if so do: 1090# 1) Check that make has not been executed in the kernel src $(srctree) 1091prepare3: include/config/kernel.release 1092ifneq ($(KBUILD_SRC),) 1093 @$(kecho) ' Using $(srctree) as source for kernel' 1094 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \ 1095 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \ 1096 echo >&2 " in the '$(srctree)' directory.";\ 1097 /bin/false; \ 1098 fi; 1099endif 1100 1101# prepare2 creates a makefile if using a separate output directory. 1102# From this point forward, .config has been reprocessed, so any rules 1103# that need to depend on updated CONFIG_* values can be checked here. 1104prepare2: prepare3 outputmakefile asm-generic 1105 1106prepare1: prepare2 $(version_h) $(autoksyms_h) include/generated/utsrelease.h 1107 $(cmd_crmodverdir) 1108 1109archprepare: archheaders archscripts prepare1 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 += __headers 1178__headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts 1179 $(Q)$(MAKE) $(build)=scripts build_unifdef 1180 1181PHONY += headers_install_all 1182headers_install_all: 1183 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install 1184 1185PHONY += headers_install 1186headers_install: __headers 1187 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \ 1188 $(error Headers not exportable for the $(SRCARCH) architecture)) 1189 $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include 1190 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) 1191 1192PHONY += headers_check_all 1193headers_check_all: headers_install_all 1194 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check 1195 1196PHONY += headers_check 1197headers_check: headers_install 1198 $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1 1199 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) HDRCHECK=1 1200 1201# --------------------------------------------------------------------------- 1202# Kernel selftest 1203 1204PHONY += kselftest 1205kselftest: 1206 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1207 1208PHONY += kselftest-clean 1209kselftest-clean: 1210 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean 1211 1212PHONY += kselftest-merge 1213kselftest-merge: 1214 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1215 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \ 1216 -m $(objtree)/.config \ 1217 $(srctree)/tools/testing/selftests/*/config 1218 +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1219 1220# --------------------------------------------------------------------------- 1221# Modules 1222 1223ifdef CONFIG_MODULES 1224 1225# By default, build modules as well 1226 1227all: modules 1228 1229# Build modules 1230# 1231# A module can be listed more than once in obj-m resulting in 1232# duplicate lines in modules.order files. Those are removed 1233# using awk while concatenating to the final file. 1234 1235PHONY += modules 1236modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin 1237 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order 1238 @$(kecho) ' Building modules, stage 2.'; 1239 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1240 1241modules.builtin: $(vmlinux-dirs:%=%/modules.builtin) 1242 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin 1243 1244%/modules.builtin: include/config/auto.conf include/config/tristate.conf 1245 $(Q)$(MAKE) $(modbuiltin)=$* 1246 1247 1248# Target to prepare building external modules 1249PHONY += modules_prepare 1250modules_prepare: prepare scripts 1251 1252# Target to install modules 1253PHONY += modules_install 1254modules_install: _modinst_ _modinst_post 1255 1256PHONY += _modinst_ 1257_modinst_: 1258 @rm -rf $(MODLIB)/kernel 1259 @rm -f $(MODLIB)/source 1260 @mkdir -p $(MODLIB)/kernel 1261 @ln -s $(abspath $(srctree)) $(MODLIB)/source 1262 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1263 rm -f $(MODLIB)/build ; \ 1264 ln -s $(CURDIR) $(MODLIB)/build ; \ 1265 fi 1266 @cp -f $(objtree)/modules.order $(MODLIB)/ 1267 @cp -f $(objtree)/modules.builtin $(MODLIB)/ 1268 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1269 1270# This depmod is only for convenience to give the initial 1271# boot a modules.dep even before / is mounted read-write. However the 1272# boot script depmod is the master version. 1273PHONY += _modinst_post 1274_modinst_post: _modinst_ 1275 $(call cmd,depmod) 1276 1277ifeq ($(CONFIG_MODULE_SIG), y) 1278PHONY += modules_sign 1279modules_sign: 1280 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign 1281endif 1282 1283else # CONFIG_MODULES 1284 1285# Modules not configured 1286# --------------------------------------------------------------------------- 1287 1288PHONY += modules modules_install 1289modules modules_install: 1290 @echo >&2 1291 @echo >&2 "The present kernel configuration has modules disabled." 1292 @echo >&2 "Type 'make config' and enable loadable module support." 1293 @echo >&2 "Then build a kernel with module support enabled." 1294 @echo >&2 1295 @exit 1 1296 1297endif # CONFIG_MODULES 1298 1299### 1300# Cleaning is done on three levels. 1301# make clean Delete most generated files 1302# Leave enough to build external modules 1303# make mrproper Delete the current configuration, and all generated files 1304# make distclean Remove editor backup files, patch leftover files and the like 1305 1306# Directories & files removed with 'make clean' 1307CLEAN_DIRS += $(MODVERDIR) include/ksym 1308 1309# Directories & files removed with 'make mrproper' 1310MRPROPER_DIRS += include/config usr/include include/generated \ 1311 arch/*/include/generated .tmp_objdiff 1312MRPROPER_FILES += .config .config.old .version \ 1313 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \ 1314 signing_key.pem signing_key.priv signing_key.x509 \ 1315 x509.genkey extra_certificates signing_key.x509.keyid \ 1316 signing_key.x509.signer vmlinux-gdb.py 1317 1318# clean - Delete most, but leave enough to build external modules 1319# 1320clean: rm-dirs := $(CLEAN_DIRS) 1321clean: rm-files := $(CLEAN_FILES) 1322clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples) 1323 1324PHONY += $(clean-dirs) clean archclean vmlinuxclean 1325$(clean-dirs): 1326 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1327 1328vmlinuxclean: 1329 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1330 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1331 1332clean: archclean vmlinuxclean 1333 1334# mrproper - Delete all generated files, including .config 1335# 1336mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS)) 1337mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1338mrproper-dirs := $(addprefix _mrproper_,scripts) 1339 1340PHONY += $(mrproper-dirs) mrproper archmrproper 1341$(mrproper-dirs): 1342 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1343 1344mrproper: clean archmrproper $(mrproper-dirs) 1345 $(call cmd,rmdirs) 1346 $(call cmd,rmfiles) 1347 1348# distclean 1349# 1350PHONY += distclean 1351 1352distclean: mrproper 1353 @find $(srctree) $(RCS_FIND_IGNORE) \ 1354 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1355 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1356 -o -name 'core' \) \ 1357 -type f -print | xargs rm -f 1358 1359 1360# Packaging of the kernel to various formats 1361# --------------------------------------------------------------------------- 1362package-dir := scripts/package 1363 1364%src-pkg: FORCE 1365 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1366%pkg: include/config/kernel.release FORCE 1367 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1368 1369 1370# Brief documentation of the typical targets used 1371# --------------------------------------------------------------------------- 1372 1373boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1374boards := $(sort $(notdir $(boards))) 1375board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1376board-dirs := $(sort $(notdir $(board-dirs:/=))) 1377 1378PHONY += help 1379help: 1380 @echo 'Cleaning targets:' 1381 @echo ' clean - Remove most generated files but keep the config and' 1382 @echo ' enough build support to build external modules' 1383 @echo ' mrproper - Remove all generated files + config + various backup files' 1384 @echo ' distclean - mrproper + remove editor backup and patch files' 1385 @echo '' 1386 @echo 'Configuration targets:' 1387 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1388 @echo '' 1389 @echo 'Other generic targets:' 1390 @echo ' all - Build all targets marked with [*]' 1391 @echo '* vmlinux - Build the bare kernel' 1392 @echo '* modules - Build all modules' 1393 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1394 @echo ' dir/ - Build all files in dir and below' 1395 @echo ' dir/file.[ois] - Build specified target only' 1396 @echo ' dir/file.ll - Build the LLVM assembly file' 1397 @echo ' (requires compiler support for LLVM assembly generation)' 1398 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1399 @echo ' (requires a recent binutils and recent build (System.map))' 1400 @echo ' dir/file.ko - Build module including final link' 1401 @echo ' modules_prepare - Set up for building external modules' 1402 @echo ' tags/TAGS - Generate tags file for editors' 1403 @echo ' cscope - Generate cscope index' 1404 @echo ' gtags - Generate GNU GLOBAL index' 1405 @echo ' kernelrelease - Output the release version string (use with make -s)' 1406 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1407 @echo ' image_name - Output the image name (use with make -s)' 1408 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1409 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1410 echo '' 1411 @echo 'Static analysers:' 1412 @echo ' checkstack - Generate a list of stack hogs' 1413 @echo ' namespacecheck - Name space analysis on compiled kernel' 1414 @echo ' versioncheck - Sanity check on version.h usage' 1415 @echo ' includecheck - Check for duplicate included header files' 1416 @echo ' export_report - List the usages of all exported symbols' 1417 @echo ' headers_check - Sanity check on exported headers' 1418 @echo ' headerdep - Detect inclusion cycles in headers' 1419 @echo ' coccicheck - Check with Coccinelle' 1420 @echo '' 1421 @echo 'Kernel selftest:' 1422 @echo ' kselftest - Build and run kernel selftest (run as root)' 1423 @echo ' Build, install, and boot kernel before' 1424 @echo ' running kselftest on it' 1425 @echo ' kselftest-clean - Remove all generated kselftest files' 1426 @echo ' kselftest-merge - Merge all the config dependencies of kselftest to existing' 1427 @echo ' .config.' 1428 @echo '' 1429 @echo 'Userspace tools targets:' 1430 @echo ' use "make tools/help"' 1431 @echo ' or "cd tools; make help"' 1432 @echo '' 1433 @echo 'Kernel packaging:' 1434 @$(MAKE) $(build)=$(package-dir) help 1435 @echo '' 1436 @echo 'Documentation targets:' 1437 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1438 @echo '' 1439 @echo 'Architecture specific targets ($(SRCARCH)):' 1440 @$(if $(archhelp),$(archhelp),\ 1441 echo ' No architecture specific help defined for $(SRCARCH)') 1442 @echo '' 1443 @$(if $(boards), \ 1444 $(foreach b, $(boards), \ 1445 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1446 echo '') 1447 @$(if $(board-dirs), \ 1448 $(foreach b, $(board-dirs), \ 1449 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1450 printf " %-16s - Show all of the above\\n" help-boards; \ 1451 echo '') 1452 1453 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1454 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1455 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1456 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK (sparse by default)' 1457 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1458 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1459 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where' 1460 @echo ' 1: warnings which may be relevant and do not occur too often' 1461 @echo ' 2: warnings which occur quite often but may still be relevant' 1462 @echo ' 3: more obscure warnings, can most likely be ignored' 1463 @echo ' Multiple levels can be combined with W=12 or W=123' 1464 @echo '' 1465 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1466 @echo 'For further info see the ./README file' 1467 1468 1469help-board-dirs := $(addprefix help-,$(board-dirs)) 1470 1471help-boards: $(help-board-dirs) 1472 1473boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1474 1475$(help-board-dirs): help-%: 1476 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1477 @$(if $(boards-per-dir), \ 1478 $(foreach b, $(boards-per-dir), \ 1479 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1480 echo '') 1481 1482 1483# Documentation targets 1484# --------------------------------------------------------------------------- 1485DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1486 linkcheckdocs dochelp refcheckdocs 1487PHONY += $(DOC_TARGETS) 1488$(DOC_TARGETS): scripts_basic FORCE 1489 $(Q)$(MAKE) $(build)=Documentation $@ 1490 1491else # KBUILD_EXTMOD 1492 1493### 1494# External module support. 1495# When building external modules the kernel used as basis is considered 1496# read-only, and no consistency checks are made and the make 1497# system is not used on the basis kernel. If updates are required 1498# in the basis kernel ordinary make commands (without M=...) must 1499# be used. 1500# 1501# The following are the only valid targets when building external 1502# modules. 1503# make M=dir clean Delete all automatically generated files 1504# make M=dir modules Make all modules in specified dir 1505# make M=dir Same as 'make M=dir modules' 1506# make M=dir modules_install 1507# Install the modules built in the module directory 1508# Assumes install directory is already created 1509 1510# We are always building modules 1511KBUILD_MODULES := 1 1512PHONY += crmodverdir 1513crmodverdir: 1514 $(cmd_crmodverdir) 1515 1516PHONY += $(objtree)/Module.symvers 1517$(objtree)/Module.symvers: 1518 @test -e $(objtree)/Module.symvers || ( \ 1519 echo; \ 1520 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \ 1521 echo " is missing; modules will have no dependencies and modversions."; \ 1522 echo ) 1523 1524module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD)) 1525PHONY += $(module-dirs) modules 1526$(module-dirs): crmodverdir $(objtree)/Module.symvers 1527 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@) 1528 1529modules: $(module-dirs) 1530 @$(kecho) ' Building modules, stage 2.'; 1531 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1532 1533PHONY += modules_install 1534modules_install: _emodinst_ _emodinst_post 1535 1536install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra) 1537PHONY += _emodinst_ 1538_emodinst_: 1539 $(Q)mkdir -p $(MODLIB)/$(install-dir) 1540 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1541 1542PHONY += _emodinst_post 1543_emodinst_post: _emodinst_ 1544 $(call cmd,depmod) 1545 1546clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD)) 1547 1548PHONY += $(clean-dirs) clean 1549$(clean-dirs): 1550 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1551 1552clean: rm-dirs := $(MODVERDIR) 1553clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers 1554 1555PHONY += help 1556help: 1557 @echo ' Building external modules.' 1558 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1559 @echo '' 1560 @echo ' modules - default target, build the module(s)' 1561 @echo ' modules_install - install the module' 1562 @echo ' clean - remove generated files in module directory only' 1563 @echo '' 1564 1565# Dummies... 1566PHONY += prepare scripts 1567prepare: ; 1568scripts: ; 1569endif # KBUILD_EXTMOD 1570 1571clean: $(clean-dirs) 1572 $(call cmd,rmdirs) 1573 $(call cmd,rmfiles) 1574 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1575 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \ 1576 -o -name '*.ko.*' -o -name '*.dtb' -o -name '*.dtb.S' \ 1577 -o -name '*.dwo' -o -name '*.lst' \ 1578 -o -name '*.su' \ 1579 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1580 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 1581 -o -name '*.asn1.[ch]' \ 1582 -o -name '*.symtypes' -o -name 'modules.order' \ 1583 -o -name modules.builtin -o -name '.tmp_*.o.*' \ 1584 -o -name '*.c.[012]*.*' \ 1585 -o -name '*.ll' \ 1586 -o -name '*.gcno' \) -type f -print | xargs rm -f 1587 1588# Generate tags for editors 1589# --------------------------------------------------------------------------- 1590quiet_cmd_tags = GEN $@ 1591 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@ 1592 1593tags TAGS cscope gtags: FORCE 1594 $(call cmd,tags) 1595 1596# Scripts to check various things for consistency 1597# --------------------------------------------------------------------------- 1598 1599PHONY += includecheck versioncheck coccicheck namespacecheck export_report 1600 1601includecheck: 1602 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1603 -name '*.[hcS]' -type f -print | sort \ 1604 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1605 1606versioncheck: 1607 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1608 -name '*.[hcS]' -type f -print | sort \ 1609 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1610 1611coccicheck: 1612 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@ 1613 1614namespacecheck: 1615 $(PERL) $(srctree)/scripts/namespace.pl 1616 1617export_report: 1618 $(PERL) $(srctree)/scripts/export_report.pl 1619 1620endif #ifeq ($(config-targets),1) 1621endif #ifeq ($(mixed-targets),1) 1622 1623PHONY += checkstack kernelrelease kernelversion image_name 1624 1625# UML needs a little special treatment here. It wants to use the host 1626# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1627# else wants $(ARCH), including people doing cross-builds, which means 1628# that $(SUBARCH) doesn't work here. 1629ifeq ($(ARCH), um) 1630CHECKSTACK_ARCH := $(SUBARCH) 1631else 1632CHECKSTACK_ARCH := $(ARCH) 1633endif 1634checkstack: 1635 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1636 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1637 1638kernelrelease: 1639 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1640 1641kernelversion: 1642 @echo $(KERNELVERSION) 1643 1644image_name: 1645 @echo $(KBUILD_IMAGE) 1646 1647# Clear a bunch of variables before executing the submake 1648tools/: FORCE 1649 $(Q)mkdir -p $(objtree)/tools 1650 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ 1651 1652tools/%: FORCE 1653 $(Q)mkdir -p $(objtree)/tools 1654 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $* 1655 1656# Single targets 1657# --------------------------------------------------------------------------- 1658# Single targets are compatible with: 1659# - build with mixed source and output 1660# - build with separate output dir 'make O=...' 1661# - external modules 1662# 1663# target-dir => where to store outputfile 1664# build-dir => directory in kernel source tree to use 1665 1666ifeq ($(KBUILD_EXTMOD),) 1667 build-dir = $(patsubst %/,%,$(dir $@)) 1668 target-dir = $(dir $@) 1669else 1670 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@))) 1671 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash)) 1672 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@)) 1673endif 1674 1675%.s: %.c prepare scripts FORCE 1676 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1677%.i: %.c prepare scripts FORCE 1678 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1679%.o: %.c prepare scripts FORCE 1680 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1681%.lst: %.c prepare scripts FORCE 1682 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1683%.s: %.S prepare scripts FORCE 1684 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1685%.o: %.S prepare scripts FORCE 1686 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1687%.symtypes: %.c prepare scripts FORCE 1688 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1689%.ll: %.c prepare scripts FORCE 1690 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1691 1692# Modules 1693/: prepare scripts FORCE 1694 $(cmd_crmodverdir) 1695 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1696 $(build)=$(build-dir) 1697# Make sure the latest headers are built for Documentation 1698Documentation/ samples/: headers_install 1699%/: prepare scripts FORCE 1700 $(cmd_crmodverdir) 1701 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1702 $(build)=$(build-dir) 1703%.ko: prepare scripts FORCE 1704 $(cmd_crmodverdir) 1705 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1706 $(build)=$(build-dir) $(@:.ko=.o) 1707 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1708 1709# FIXME Should go into a make.lib or something 1710# =========================================================================== 1711 1712quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs))) 1713 cmd_rmdirs = rm -rf $(rm-dirs) 1714 1715quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1716 cmd_rmfiles = rm -f $(rm-files) 1717 1718# Run depmod only if we have System.map and depmod is executable 1719quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) 1720 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1721 $(KERNELRELEASE) 1722 1723# Create temporary dir for module support files 1724# clean it up only when building all modules 1725cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \ 1726 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*) 1727 1728# read all saved command lines 1729 1730cmd_files := $(wildcard .*.cmd $(foreach f,$(sort $(targets)),$(dir $(f)).$(notdir $(f)).cmd)) 1731 1732ifneq ($(cmd_files),) 1733 $(cmd_files): ; # Do not try to update included dependency files 1734 include $(cmd_files) 1735endif 1736 1737endif # skip-makefile 1738 1739PHONY += FORCE 1740FORCE: 1741 1742# Declare the contents of the PHONY variable as phony. We keep that 1743# information in a variable so we can use it in if_changed and friends. 1744.PHONY: $(PHONY) 1745