1# SPDX-License-Identifier: GPL-2.0 2VERSION = 5 3PATCHLEVEL = 2 4SUBLEVEL = 0 5EXTRAVERSION = 6NAME = Bobtail Squid 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# We are using a recursive build, so we need to do a little thinking 19# to get the ordering right. 20# 21# Most importantly: sub-Makefiles should only ever modify files in 22# their own directory. If in some directory we have a dependency on 23# a file in another dir (which doesn't happen often, but it's often 24# unavoidable when linking the built-in.a targets which finally 25# turn into vmlinux), we will call a sub make in that other dir, and 26# after that we are sure that everything which is in that other dir 27# is now up to date. 28# 29# The only cases where we need to modify files which have global 30# effects are thus separated out and done before the recursive 31# descending is started. They are now explicitly listed as the 32# prepare rule. 33 34ifneq ($(sub_make_done),1) 35 36# Do not use make's built-in rules and variables 37# (this increases performance and avoids hard-to-debug behaviour) 38MAKEFLAGS += -rR 39 40# Avoid funny character set dependencies 41unexport LC_ALL 42LC_COLLATE=C 43LC_NUMERIC=C 44export LC_COLLATE LC_NUMERIC 45 46# Avoid interference with shell env settings 47unexport GREP_OPTIONS 48 49# Beautify output 50# --------------------------------------------------------------------------- 51# 52# Normally, we echo the whole command before executing it. By making 53# that echo $($(quiet)$(cmd)), we now have the possibility to set 54# $(quiet) to choose other forms of output instead, e.g. 55# 56# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@ 57# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< 58# 59# If $(quiet) is empty, the whole command will be printed. 60# If it is set to "quiet_", only the short version will be printed. 61# If it is set to "silent_", nothing will be printed at all, since 62# the variable $(silent_cmd_cc_o_c) doesn't exist. 63# 64# A simple variant is to prefix commands with $(Q) - that's useful 65# for commands that shall be hidden in non-verbose mode. 66# 67# $(Q)ln $@ :< 68# 69# If KBUILD_VERBOSE equals 0 then the above command will be hidden. 70# If KBUILD_VERBOSE equals 1 then the above command is displayed. 71# 72# To put more focus on warnings, be less verbose as default 73# Use 'make V=1' to see the full commands 74 75ifeq ("$(origin V)", "command line") 76 KBUILD_VERBOSE = $(V) 77endif 78ifndef KBUILD_VERBOSE 79 KBUILD_VERBOSE = 0 80endif 81 82ifeq ($(KBUILD_VERBOSE),1) 83 quiet = 84 Q = 85else 86 quiet=quiet_ 87 Q = @ 88endif 89 90# If the user is running make -s (silent mode), suppress echoing of 91# commands 92 93ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),) 94 quiet=silent_ 95endif 96 97export quiet Q KBUILD_VERBOSE 98 99# Kbuild will save output files in the current working directory. 100# This does not need to match to the root of the kernel source tree. 101# 102# For example, you can do this: 103# 104# cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile 105# 106# If you want to save output files in a different location, there are 107# two syntaxes to specify it. 108# 109# 1) O= 110# Use "make O=dir/to/store/output/files/" 111# 112# 2) Set KBUILD_OUTPUT 113# Set the environment variable KBUILD_OUTPUT to point to the output directory. 114# export KBUILD_OUTPUT=dir/to/store/output/files/; make 115# 116# The O= assignment takes precedence over the KBUILD_OUTPUT environment 117# variable. 118 119# Do we want to change the working directory? 120ifeq ("$(origin O)", "command line") 121 KBUILD_OUTPUT := $(O) 122endif 123 124ifneq ($(KBUILD_OUTPUT),) 125# Make's built-in functions such as $(abspath ...), $(realpath ...) cannot 126# expand a shell special character '~'. We use a somewhat tedious way here. 127abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd) 128$(if $(abs_objtree),, \ 129 $(error failed to create output directory "$(KBUILD_OUTPUT)")) 130 131# $(realpath ...) resolves symlinks 132abs_objtree := $(realpath $(abs_objtree)) 133else 134abs_objtree := $(CURDIR) 135endif # ifneq ($(KBUILD_OUTPUT),) 136 137ifeq ($(abs_objtree),$(CURDIR)) 138# Suppress "Entering directory ..." unless we are changing the work directory. 139MAKEFLAGS += --no-print-directory 140else 141need-sub-make := 1 142endif 143 144abs_srctree := $(realpath $(dir $(lastword $(MAKEFILE_LIST)))) 145 146ifneq ($(words $(subst :, ,$(abs_srctree))), 1) 147$(error source directory cannot contain spaces or colons) 148endif 149 150ifneq ($(abs_srctree),$(abs_objtree)) 151# Look for make include files relative to root of kernel src 152# 153# This does not become effective immediately because MAKEFLAGS is re-parsed 154# once after the Makefile is read. We need to invoke sub-make. 155MAKEFLAGS += --include-dir=$(abs_srctree) 156need-sub-make := 1 157endif 158 159ifneq ($(filter 3.%,$(MAKE_VERSION)),) 160# 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x 161# We need to invoke sub-make to avoid implicit rules in the top Makefile. 162need-sub-make := 1 163# Cancel implicit rules for this Makefile. 164$(lastword $(MAKEFILE_LIST)): ; 165endif 166 167export abs_srctree abs_objtree 168export sub_make_done := 1 169 170ifeq ($(need-sub-make),1) 171 172PHONY += $(MAKECMDGOALS) sub-make 173 174$(filter-out _all sub-make $(lastword $(MAKEFILE_LIST)), $(MAKECMDGOALS)) _all: sub-make 175 @: 176 177# Invoke a second make in the output directory, passing relevant variables 178sub-make: 179 $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS) 180 181endif # need-sub-make 182endif # sub_make_done 183 184# We process the rest of the Makefile if this is the final invocation of make 185ifeq ($(need-sub-make),) 186 187# Do not print "Entering directory ...", 188# but we want to display it when entering to the output directory 189# so that IDEs/editors are able to understand relative filenames. 190MAKEFLAGS += --no-print-directory 191 192# Call a source code checker (by default, "sparse") as part of the 193# C compilation. 194# 195# Use 'make C=1' to enable checking of only re-compiled files. 196# Use 'make C=2' to enable checking of *all* source files, regardless 197# of whether they are re-compiled or not. 198# 199# See the file "Documentation/dev-tools/sparse.rst" for more details, 200# including where to get the "sparse" utility. 201 202ifeq ("$(origin C)", "command line") 203 KBUILD_CHECKSRC = $(C) 204endif 205ifndef KBUILD_CHECKSRC 206 KBUILD_CHECKSRC = 0 207endif 208 209# Use make M=dir to specify directory of external module to build 210# Old syntax make ... SUBDIRS=$PWD is still supported 211# Setting the environment variable KBUILD_EXTMOD take precedence 212ifdef SUBDIRS 213 $(warning ================= WARNING ================) 214 $(warning 'SUBDIRS' will be removed after Linux 5.3) 215 $(warning ) 216 $(warning If you are building an individual subdirectory) 217 $(warning in the kernel tree, you can do like this:) 218 $(warning $$ make path/to/dir/you/want/to/build/) 219 $(warning (Do not forget the trailing slash)) 220 $(warning ) 221 $(warning If you are building an external module,) 222 $(warning Please use 'M=' or 'KBUILD_EXTMOD' instead) 223 $(warning ==========================================) 224 KBUILD_EXTMOD ?= $(SUBDIRS) 225endif 226 227ifeq ("$(origin M)", "command line") 228 KBUILD_EXTMOD := $(M) 229endif 230 231export KBUILD_CHECKSRC KBUILD_EXTMOD 232 233ifeq ($(abs_srctree),$(abs_objtree)) 234 # building in the source tree 235 srctree := . 236 building_out_of_srctree := 237else 238 ifeq ($(abs_srctree)/,$(dir $(abs_objtree))) 239 # building in a subdirectory of the source tree 240 srctree := .. 241 else 242 srctree := $(abs_srctree) 243 endif 244 building_out_of_srctree := 1 245endif 246 247ifneq ($(KBUILD_ABS_SRCTREE),) 248srctree := $(abs_srctree) 249endif 250 251objtree := . 252VPATH := $(srctree) 253 254export building_out_of_srctree srctree objtree VPATH 255 256# To make sure we do not include .config for any of the *config targets 257# catch them early, and hand them over to scripts/kconfig/Makefile 258# It is allowed to specify more targets when calling make, including 259# mixing *config targets and build targets. 260# For example 'make oldconfig all'. 261# Detect when mixed targets is specified, and make a second invocation 262# of make so .config is not included in this case either (for *config). 263 264version_h := include/generated/uapi/linux/version.h 265old_version_h := include/linux/version.h 266 267clean-targets := %clean mrproper cleandocs 268no-dot-config-targets := $(clean-targets) \ 269 cscope gtags TAGS tags help% %docs check% coccicheck \ 270 $(version_h) headers headers_% archheaders archscripts \ 271 %asm-generic kernelversion %src-pkg 272no-sync-config-targets := $(no-dot-config-targets) install %install \ 273 kernelrelease 274 275config-targets := 0 276mixed-targets := 0 277dot-config := 1 278may-sync-config := 1 279 280ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 281 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 282 dot-config := 0 283 endif 284endif 285 286ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),) 287 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),) 288 may-sync-config := 0 289 endif 290endif 291 292ifneq ($(KBUILD_EXTMOD),) 293 may-sync-config := 0 294endif 295 296ifeq ($(KBUILD_EXTMOD),) 297 ifneq ($(filter config %config,$(MAKECMDGOALS)),) 298 config-targets := 1 299 ifneq ($(words $(MAKECMDGOALS)),1) 300 mixed-targets := 1 301 endif 302 endif 303endif 304 305# For "make -j clean all", "make -j mrproper defconfig all", etc. 306ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),) 307 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) 308 mixed-targets := 1 309 endif 310endif 311 312# install and modules_install need also be processed one by one 313ifneq ($(filter install,$(MAKECMDGOALS)),) 314 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 315 mixed-targets := 1 316 endif 317endif 318 319ifeq ($(mixed-targets),1) 320# =========================================================================== 321# We're called with mixed targets (*config and build targets). 322# Handle them one by one. 323 324PHONY += $(MAKECMDGOALS) __build_one_by_one 325 326$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one 327 @: 328 329__build_one_by_one: 330 $(Q)set -e; \ 331 for i in $(MAKECMDGOALS); do \ 332 $(MAKE) -f $(srctree)/Makefile $$i; \ 333 done 334 335else 336 337include scripts/Kbuild.include 338 339# Read KERNELRELEASE from include/config/kernel.release (if it exists) 340KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null) 341KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 342export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 343 344include scripts/subarch.include 345 346# Cross compiling and selecting different set of gcc/bin-utils 347# --------------------------------------------------------------------------- 348# 349# When performing cross compilation for other architectures ARCH shall be set 350# to the target architecture. (See arch/* for the possibilities). 351# ARCH can be set during invocation of make: 352# make ARCH=ia64 353# Another way is to have ARCH set in the environment. 354# The default ARCH is the host where make is executed. 355 356# CROSS_COMPILE specify the prefix used for all executables used 357# during compilation. Only gcc and related bin-utils executables 358# are prefixed with $(CROSS_COMPILE). 359# CROSS_COMPILE can be set on the command line 360# make CROSS_COMPILE=ia64-linux- 361# Alternatively CROSS_COMPILE can be set in the environment. 362# Default value for CROSS_COMPILE is not to prefix executables 363# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 364ARCH ?= $(SUBARCH) 365 366# Architecture as present in compile.h 367UTS_MACHINE := $(ARCH) 368SRCARCH := $(ARCH) 369 370# Additional ARCH settings for x86 371ifeq ($(ARCH),i386) 372 SRCARCH := x86 373endif 374ifeq ($(ARCH),x86_64) 375 SRCARCH := x86 376endif 377 378# Additional ARCH settings for sparc 379ifeq ($(ARCH),sparc32) 380 SRCARCH := sparc 381endif 382ifeq ($(ARCH),sparc64) 383 SRCARCH := sparc 384endif 385 386# Additional ARCH settings for sh 387ifeq ($(ARCH),sh64) 388 SRCARCH := sh 389endif 390 391KCONFIG_CONFIG ?= .config 392export KCONFIG_CONFIG 393 394# SHELL used by kbuild 395CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \ 396 else if [ -x /bin/bash ]; then echo /bin/bash; \ 397 else echo sh; fi ; fi) 398 399HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null) 400HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null) 401HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null) 402 403HOSTCC = gcc 404HOSTCXX = g++ 405KBUILD_HOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \ 406 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) \ 407 $(HOSTCFLAGS) 408KBUILD_HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) 409KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 410KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 411 412# Make variables (CC, etc...) 413AS = $(CROSS_COMPILE)as 414LD = $(CROSS_COMPILE)ld 415CC = $(CROSS_COMPILE)gcc 416CPP = $(CC) -E 417AR = $(CROSS_COMPILE)ar 418NM = $(CROSS_COMPILE)nm 419STRIP = $(CROSS_COMPILE)strip 420OBJCOPY = $(CROSS_COMPILE)objcopy 421OBJDUMP = $(CROSS_COMPILE)objdump 422PAHOLE = pahole 423LEX = flex 424YACC = bison 425AWK = awk 426INSTALLKERNEL := installkernel 427DEPMOD = /sbin/depmod 428PERL = perl 429PYTHON = python 430PYTHON2 = python2 431PYTHON3 = python3 432CHECK = sparse 433 434CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 435 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 436NOSTDINC_FLAGS := 437CFLAGS_MODULE = 438AFLAGS_MODULE = 439LDFLAGS_MODULE = 440CFLAGS_KERNEL = 441AFLAGS_KERNEL = 442LDFLAGS_vmlinux = 443 444# Use USERINCLUDE when you must reference the UAPI directories only. 445USERINCLUDE := \ 446 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 447 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 448 -I$(srctree)/include/uapi \ 449 -I$(objtree)/include/generated/uapi \ 450 -include $(srctree)/include/linux/kconfig.h 451 452# Use LINUXINCLUDE when you must reference the include/ directory. 453# Needed to be compatible with the O= option 454LINUXINCLUDE := \ 455 -I$(srctree)/arch/$(SRCARCH)/include \ 456 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 457 $(if $(building_out_of_srctree),-I$(srctree)/include) \ 458 -I$(objtree)/include \ 459 $(USERINCLUDE) 460 461KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 462KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \ 463 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \ 464 -Werror=implicit-function-declaration -Werror=implicit-int \ 465 -Wno-format-security \ 466 -std=gnu89 467KBUILD_CPPFLAGS := -D__KERNEL__ 468KBUILD_AFLAGS_KERNEL := 469KBUILD_CFLAGS_KERNEL := 470KBUILD_AFLAGS_MODULE := -DMODULE 471KBUILD_CFLAGS_MODULE := -DMODULE 472KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds 473KBUILD_LDFLAGS := 474GCC_PLUGINS_CFLAGS := 475 476export ARCH SRCARCH CONFIG_SHELL HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE AS LD CC 477export CPP AR NM STRIP OBJCOPY OBJDUMP PAHOLE KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS 478export MAKE LEX YACC AWK INSTALLKERNEL PERL PYTHON PYTHON2 PYTHON3 UTS_MACHINE 479export HOSTCXX KBUILD_HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS 480 481export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 482export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 483export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN 484export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 485export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 486export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 487export KBUILD_ARFLAGS 488 489# When compiling out-of-tree modules, put MODVERDIR in the module 490# tree rather than in the kernel tree. The kernel tree might 491# even be read-only. 492export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions 493 494# Files to ignore in find ... statements 495 496export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 497 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 498 -prune -o 499export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 500 --exclude CVS --exclude .pc --exclude .hg --exclude .git 501 502# =========================================================================== 503# Rules shared between *config targets and build targets 504 505# Basic helpers built in scripts/basic/ 506PHONY += scripts_basic 507scripts_basic: 508 $(Q)$(MAKE) $(build)=scripts/basic 509 $(Q)rm -f .tmp_quiet_recordmcount 510 511PHONY += outputmakefile 512# outputmakefile generates a Makefile in the output directory, if using a 513# separate output directory. This allows convenient use of make in the 514# output directory. 515# At the same time when output Makefile generated, generate .gitignore to 516# ignore whole output directory 517outputmakefile: 518ifdef building_out_of_srctree 519 $(Q)ln -fsn $(srctree) source 520 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree) 521 $(Q)test -e .gitignore || \ 522 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 523endif 524 525ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),) 526ifneq ($(CROSS_COMPILE),) 527CLANG_FLAGS := --target=$(notdir $(CROSS_COMPILE:%-=%)) 528GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit)) 529CLANG_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR) 530GCC_TOOLCHAIN := $(realpath $(GCC_TOOLCHAIN_DIR)/..) 531endif 532ifneq ($(GCC_TOOLCHAIN),) 533CLANG_FLAGS += --gcc-toolchain=$(GCC_TOOLCHAIN) 534endif 535ifeq ($(shell $(AS) --version 2>&1 | head -n 1 | grep clang),) 536CLANG_FLAGS += -no-integrated-as 537endif 538CLANG_FLAGS += -Werror=unknown-warning-option 539KBUILD_CFLAGS += $(CLANG_FLAGS) 540KBUILD_AFLAGS += $(CLANG_FLAGS) 541export CLANG_FLAGS 542endif 543 544# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 545# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 546# CC_VERSION_TEXT is referenced from Kconfig (so it needs export), 547# and from include/config/auto.conf.cmd to detect the compiler upgrade. 548CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1) 549 550ifeq ($(config-targets),1) 551# =========================================================================== 552# *config targets only - make sure prerequisites are updated, and descend 553# in scripts/kconfig to make the *config target 554 555# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 556# KBUILD_DEFCONFIG may point out an alternative default configuration 557# used for 'make defconfig' 558include arch/$(SRCARCH)/Makefile 559export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT 560 561config: scripts_basic outputmakefile FORCE 562 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 563 564%config: scripts_basic outputmakefile FORCE 565 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 566 567else 568# =========================================================================== 569# Build targets only - this includes vmlinux, arch specific targets, clean 570# targets and others. In general all targets except *config targets. 571 572# If building an external module we do not care about the all: rule 573# but instead _all depend on modules 574PHONY += all 575ifeq ($(KBUILD_EXTMOD),) 576_all: all 577else 578_all: modules 579endif 580 581# Decide whether to build built-in, modular, or both. 582# Normally, just do built-in. 583 584KBUILD_MODULES := 585KBUILD_BUILTIN := 1 586 587# If we have only "make modules", don't compile built-in objects. 588# When we're building modules with modversions, we need to consider 589# the built-in objects during the descend as well, in order to 590# make sure the checksums are up to date before we record them. 591 592ifeq ($(MAKECMDGOALS),modules) 593 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1) 594endif 595 596# If we have "make <whatever> modules", compile modules 597# in addition to whatever we do anyway. 598# Just "make" or "make all" shall build modules as well 599 600ifneq ($(filter all _all modules,$(MAKECMDGOALS)),) 601 KBUILD_MODULES := 1 602endif 603 604ifeq ($(MAKECMDGOALS),) 605 KBUILD_MODULES := 1 606endif 607 608export KBUILD_MODULES KBUILD_BUILTIN 609 610ifeq ($(dot-config),1) 611include include/config/auto.conf 612endif 613 614ifeq ($(KBUILD_EXTMOD),) 615# Objects we will link into vmlinux / subdirs we need to visit 616init-y := init/ 617drivers-y := drivers/ sound/ 618drivers-$(CONFIG_SAMPLES) += samples/ 619drivers-$(CONFIG_KERNEL_HEADER_TEST) += include/ 620net-y := net/ 621libs-y := lib/ 622core-y := usr/ 623virt-y := virt/ 624endif # KBUILD_EXTMOD 625 626# The all: target is the default when no target is given on the 627# command line. 628# This allow a user to issue only 'make' to build a kernel including modules 629# Defaults to vmlinux, but the arch makefile usually adds further targets 630all: vmlinux 631 632CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \ 633 $(call cc-option,-fno-tree-loop-im) \ 634 $(call cc-disable-warning,maybe-uninitialized,) 635export CFLAGS_GCOV 636 637# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 638ifdef CONFIG_FUNCTION_TRACER 639 CC_FLAGS_FTRACE := -pg 640endif 641 642RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register 643RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register 644RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk 645RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline 646RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG))) 647RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG))) 648export RETPOLINE_CFLAGS 649export RETPOLINE_VDSO_CFLAGS 650 651# The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default 652# values of the respective KBUILD_* variables 653ARCH_CPPFLAGS := 654ARCH_AFLAGS := 655ARCH_CFLAGS := 656include arch/$(SRCARCH)/Makefile 657 658ifeq ($(dot-config),1) 659ifeq ($(may-sync-config),1) 660# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 661# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 662# because some architectures define CROSS_COMPILE there. 663include include/config/auto.conf.cmd 664 665$(KCONFIG_CONFIG): 666 @echo >&2 '***' 667 @echo >&2 '*** Configuration file "$@" not found!' 668 @echo >&2 '***' 669 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 670 @echo >&2 '*** "make menuconfig" or "make xconfig").' 671 @echo >&2 '***' 672 @/bin/false 673 674# The actual configuration files used during the build are stored in 675# include/generated/ and include/config/. Update them if .config is newer than 676# include/config/auto.conf (which mirrors .config). 677# 678# This exploits the 'multi-target pattern rule' trick. 679# The syncconfig should be executed only once to make all the targets. 680%/auto.conf %/auto.conf.cmd %/tristate.conf: $(KCONFIG_CONFIG) 681 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 682else 683# External modules and some install targets need include/generated/autoconf.h 684# and include/config/auto.conf but do not care if they are up-to-date. 685# Use auto.conf to trigger the test 686PHONY += include/config/auto.conf 687 688include/config/auto.conf: 689 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 690 echo >&2; \ 691 echo >&2 " ERROR: Kernel configuration is invalid."; \ 692 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 693 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 694 echo >&2 ; \ 695 /bin/false) 696 697endif # may-sync-config 698endif # $(dot-config) 699 700KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,) 701KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) 702KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) 703KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) 704KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) 705 706ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 707KBUILD_CFLAGS += -Os 708else 709KBUILD_CFLAGS += -O2 710endif 711 712ifdef CONFIG_CC_DISABLE_WARN_MAYBE_UNINITIALIZED 713KBUILD_CFLAGS += -Wno-maybe-uninitialized 714endif 715 716# Tell gcc to never replace conditional load with a non-conditional one 717KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 718 719include scripts/Makefile.kcov 720include scripts/Makefile.gcc-plugins 721 722ifdef CONFIG_READABLE_ASM 723# Disable optimizations that make assembler listings hard to read. 724# reorder blocks reorders the control in the function 725# ipa clone creates specialized cloned functions 726# partial inlining inlines only parts of functions 727KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \ 728 $(call cc-option,-fno-ipa-cp-clone,) \ 729 $(call cc-option,-fno-partial-inlining) 730endif 731 732ifneq ($(CONFIG_FRAME_WARN),0) 733KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN}) 734endif 735 736stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector 737stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 738stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 739 740KBUILD_CFLAGS += $(stackp-flags-y) 741 742ifdef CONFIG_CC_IS_CLANG 743KBUILD_CPPFLAGS += -Qunused-arguments 744KBUILD_CFLAGS += -Wno-format-invalid-specifier 745KBUILD_CFLAGS += -Wno-gnu 746# Quiet clang warning: comparison of unsigned expression < 0 is always false 747KBUILD_CFLAGS += -Wno-tautological-compare 748# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the 749# source of a reference will be _MergedGlobals and not on of the whitelisted names. 750# See modpost pattern 2 751KBUILD_CFLAGS += -mno-global-merge 752else 753 754# These warnings generated too much noise in a regular build. 755# Use make W=1 to enable them (see scripts/Makefile.extrawarn) 756KBUILD_CFLAGS += -Wno-unused-but-set-variable 757endif 758 759KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) 760ifdef CONFIG_FRAME_POINTER 761KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 762else 763# Some targets (ARM with Thumb2, for example), can't be built with frame 764# pointers. For those, we don't have FUNCTION_TRACER automatically 765# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 766# incompatible with -fomit-frame-pointer with current GCC, so we don't use 767# -fomit-frame-pointer with FUNCTION_TRACER. 768ifndef CONFIG_FUNCTION_TRACER 769KBUILD_CFLAGS += -fomit-frame-pointer 770endif 771endif 772 773# Initialize all stack variables with a pattern, if desired. 774ifdef CONFIG_INIT_STACK_ALL 775KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 776endif 777 778DEBUG_CFLAGS := $(call cc-option, -fno-var-tracking-assignments) 779 780ifdef CONFIG_DEBUG_INFO 781ifdef CONFIG_DEBUG_INFO_SPLIT 782DEBUG_CFLAGS += -gsplit-dwarf 783else 784DEBUG_CFLAGS += -g 785endif 786KBUILD_AFLAGS += -Wa,-gdwarf-2 787endif 788ifdef CONFIG_DEBUG_INFO_DWARF4 789DEBUG_CFLAGS += -gdwarf-4 790endif 791 792ifdef CONFIG_DEBUG_INFO_REDUCED 793DEBUG_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \ 794 $(call cc-option,-fno-var-tracking) 795endif 796 797KBUILD_CFLAGS += $(DEBUG_CFLAGS) 798export DEBUG_CFLAGS 799 800ifdef CONFIG_FUNCTION_TRACER 801ifdef CONFIG_FTRACE_MCOUNT_RECORD 802 # gcc 5 supports generating the mcount tables directly 803 ifeq ($(call cc-option-yn,-mrecord-mcount),y) 804 CC_FLAGS_FTRACE += -mrecord-mcount 805 export CC_USING_RECORD_MCOUNT := 1 806 endif 807 ifdef CONFIG_HAVE_NOP_MCOUNT 808 ifeq ($(call cc-option-yn, -mnop-mcount),y) 809 CC_FLAGS_FTRACE += -mnop-mcount 810 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 811 endif 812 endif 813endif 814ifdef CONFIG_HAVE_FENTRY 815 ifeq ($(call cc-option-yn, -mfentry),y) 816 CC_FLAGS_FTRACE += -mfentry 817 CC_FLAGS_USING += -DCC_USING_FENTRY 818 endif 819endif 820export CC_FLAGS_FTRACE 821KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 822KBUILD_AFLAGS += $(CC_FLAGS_USING) 823ifdef CONFIG_DYNAMIC_FTRACE 824 ifdef CONFIG_HAVE_C_RECORDMCOUNT 825 BUILD_C_RECORDMCOUNT := y 826 export BUILD_C_RECORDMCOUNT 827 endif 828endif 829endif 830 831# We trigger additional mismatches with less inlining 832ifdef CONFIG_DEBUG_SECTION_MISMATCH 833KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) 834endif 835 836ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 837KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 838LDFLAGS_vmlinux += --gc-sections 839endif 840 841ifdef CONFIG_LIVEPATCH 842KBUILD_CFLAGS += $(call cc-option, -flive-patching=inline-clone) 843endif 844 845# arch Makefile may override CC so keep this after arch Makefile is included 846NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) 847 848# warn about C99 declaration after statement 849KBUILD_CFLAGS += -Wdeclaration-after-statement 850 851# Variable Length Arrays (VLAs) should not be used anywhere in the kernel 852KBUILD_CFLAGS += -Wvla 853 854# disable pointer signed / unsigned warnings in gcc 4.0 855KBUILD_CFLAGS += -Wno-pointer-sign 856 857# disable stringop warnings in gcc 8+ 858KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation) 859 860# disable invalid "can't wrap" optimizations for signed / pointers 861KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow) 862 863# clang sets -fmerge-all-constants by default as optimization, but this 864# is non-conforming behavior for C and in fact breaks the kernel, so we 865# need to disable it here generally. 866KBUILD_CFLAGS += $(call cc-option,-fno-merge-all-constants) 867 868# for gcc -fno-merge-all-constants disables everything, but it is fine 869# to have actual conforming behavior enabled. 870KBUILD_CFLAGS += $(call cc-option,-fmerge-constants) 871 872# Make sure -fstack-check isn't enabled (like gentoo apparently did) 873KBUILD_CFLAGS += $(call cc-option,-fno-stack-check,) 874 875# conserve stack if available 876KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) 877 878# Prohibit date/time macros, which would make the build non-deterministic 879KBUILD_CFLAGS += $(call cc-option,-Werror=date-time) 880 881# enforce correct pointer usage 882KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 883 884# Require designated initializers for all marked structures 885KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) 886 887# change __FILE__ to the relative path from the srctree 888KBUILD_CFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 889 890# use the deterministic mode of AR if available 891KBUILD_ARFLAGS := $(call ar-option,D) 892 893include scripts/Makefile.kasan 894include scripts/Makefile.extrawarn 895include scripts/Makefile.ubsan 896 897# Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the 898# last assignments 899KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS) 900KBUILD_AFLAGS += $(ARCH_AFLAGS) $(KAFLAGS) 901KBUILD_CFLAGS += $(ARCH_CFLAGS) $(KCFLAGS) 902 903# Use --build-id when available. 904LDFLAGS_BUILD_ID := $(call ld-option, --build-id) 905KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID) 906LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID) 907 908ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 909LDFLAGS_vmlinux += $(call ld-option, -X,) 910endif 911 912# insure the checker run with the right endianness 913CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 914 915# the checker needs the correct machine size 916CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 917 918# Default kernel image to build when no specific target is given. 919# KBUILD_IMAGE may be overruled on the command line or 920# set in the environment 921# Also any assignments in arch/$(ARCH)/Makefile take precedence over 922# this default value 923export KBUILD_IMAGE ?= vmlinux 924 925# 926# INSTALL_PATH specifies where to place the updated kernel and system map 927# images. Default is /boot, but you can set it to other values 928export INSTALL_PATH ?= /boot 929 930# 931# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 932# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 933# an argument if needed. Otherwise it defaults to the kernel install path 934# 935export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 936 937# 938# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 939# relocations required by build roots. This is not defined in the 940# makefile but the argument can be passed to make if needed. 941# 942 943MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 944export MODLIB 945 946# 947# INSTALL_MOD_STRIP, if defined, will cause modules to be 948# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then 949# the default option --strip-debug will be used. Otherwise, 950# INSTALL_MOD_STRIP value will be used as the options to the strip command. 951 952ifdef INSTALL_MOD_STRIP 953ifeq ($(INSTALL_MOD_STRIP),1) 954mod_strip_cmd = $(STRIP) --strip-debug 955else 956mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP) 957endif # INSTALL_MOD_STRIP=1 958else 959mod_strip_cmd = true 960endif # INSTALL_MOD_STRIP 961export mod_strip_cmd 962 963# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed 964# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP 965# or CONFIG_MODULE_COMPRESS_XZ. 966 967mod_compress_cmd = true 968ifdef CONFIG_MODULE_COMPRESS 969 ifdef CONFIG_MODULE_COMPRESS_GZIP 970 mod_compress_cmd = gzip -n -f 971 endif # CONFIG_MODULE_COMPRESS_GZIP 972 ifdef CONFIG_MODULE_COMPRESS_XZ 973 mod_compress_cmd = xz -f 974 endif # CONFIG_MODULE_COMPRESS_XZ 975endif # CONFIG_MODULE_COMPRESS 976export mod_compress_cmd 977 978ifdef CONFIG_MODULE_SIG_ALL 979$(eval $(call config_filename,MODULE_SIG_KEY)) 980 981mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509 982else 983mod_sign_cmd = true 984endif 985export mod_sign_cmd 986 987HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf) 988 989ifdef CONFIG_STACK_VALIDATION 990 has_libelf := $(call try-run,\ 991 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0) 992 ifeq ($(has_libelf),1) 993 objtool_target := tools/objtool FORCE 994 else 995 SKIP_STACK_VALIDATION := 1 996 export SKIP_STACK_VALIDATION 997 endif 998endif 999 1000PHONY += prepare0 1001 1002ifeq ($(KBUILD_EXTMOD),) 1003core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/ 1004 1005vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \ 1006 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 1007 $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y))) 1008 1009vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \ 1010 $(patsubst %/,%,$(filter %/, $(init-) $(core-) \ 1011 $(drivers-) $(net-) $(libs-) $(virt-)))) 1012 1013init-y := $(patsubst %/, %/built-in.a, $(init-y)) 1014core-y := $(patsubst %/, %/built-in.a, $(core-y)) 1015drivers-y := $(patsubst %/, %/built-in.a, $(drivers-y)) 1016net-y := $(patsubst %/, %/built-in.a, $(net-y)) 1017libs-y1 := $(patsubst %/, %/lib.a, $(libs-y)) 1018libs-y2 := $(patsubst %/, %/built-in.a, $(filter-out %.a, $(libs-y))) 1019virt-y := $(patsubst %/, %/built-in.a, $(virt-y)) 1020 1021# Externally visible symbols (used by link-vmlinux.sh) 1022export KBUILD_VMLINUX_OBJS := $(head-y) $(init-y) $(core-y) $(libs-y2) \ 1023 $(drivers-y) $(net-y) $(virt-y) 1024export KBUILD_VMLINUX_LIBS := $(libs-y1) 1025export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1026export LDFLAGS_vmlinux 1027# used by scripts/package/Makefile 1028export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools) 1029 1030vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS) 1031 1032# Recurse until adjust_autoksyms.sh is satisfied 1033PHONY += autoksyms_recursive 1034autoksyms_recursive: $(vmlinux-deps) 1035ifdef CONFIG_TRIM_UNUSED_KSYMS 1036 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ 1037 "$(MAKE) -f $(srctree)/Makefile vmlinux" 1038endif 1039 1040# For the kernel to actually contain only the needed exported symbols, 1041# we have to build modules as well to determine what those symbols are. 1042# (this can be evaluated only once include/config/auto.conf has been included) 1043ifdef CONFIG_TRIM_UNUSED_KSYMS 1044 KBUILD_MODULES := 1 1045endif 1046 1047autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h) 1048 1049$(autoksyms_h): 1050 $(Q)mkdir -p $(dir $@) 1051 $(Q)touch $@ 1052 1053ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink) 1054 1055# Final link of vmlinux with optional arch pass after final link 1056cmd_link-vmlinux = \ 1057 $(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ; \ 1058 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) 1059 1060vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE 1061 +$(call if_changed,link-vmlinux) 1062 1063targets := vmlinux 1064 1065# The actual objects are generated when descending, 1066# make sure no implicit rule kicks in 1067$(sort $(vmlinux-deps)): $(vmlinux-dirs) ; 1068 1069# Handle descending into subdirectories listed in $(vmlinux-dirs) 1070# Preset locale variables to speed up the build process. Limit locale 1071# tweaks to this spot to avoid wrong language settings when running 1072# make menuconfig etc. 1073# Error messages still appears in the original language 1074 1075PHONY += $(vmlinux-dirs) 1076$(vmlinux-dirs): prepare 1077 $(Q)$(MAKE) $(build)=$@ need-builtin=1 1078 1079filechk_kernel.release = \ 1080 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1081 1082# Store (new) KERNELRELEASE string in include/config/kernel.release 1083include/config/kernel.release: FORCE 1084 $(call filechk,kernel.release) 1085 1086# Additional helpers built in scripts/ 1087# Carefully list dependencies so we do not try to build scripts twice 1088# in parallel 1089PHONY += scripts 1090scripts: scripts_basic scripts_dtc 1091 $(Q)$(MAKE) $(build)=$(@) 1092 1093# Things we need to do before we recursively start building the kernel 1094# or the modules are listed in "prepare". 1095# A multi level approach is used. prepareN is processed before prepareN-1. 1096# archprepare is used in arch Makefiles and when processed asm symlink, 1097# version.h and scripts_basic is processed / created. 1098 1099PHONY += prepare archprepare prepare1 prepare3 1100 1101# prepare3 is used to check if we are building in a separate output directory, 1102# and if so do: 1103# 1) Check that make has not been executed in the kernel src $(srctree) 1104prepare3: include/config/kernel.release 1105ifdef building_out_of_srctree 1106 @$(kecho) ' Using $(srctree) as source for kernel' 1107 $(Q)if [ -f $(srctree)/.config -o \ 1108 -d $(srctree)/include/config -o \ 1109 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 1110 echo >&2 " $(srctree) is not clean, please run 'make ARCH=$(ARCH) mrproper'"; \ 1111 echo >&2 " in the '$(srctree)' directory.";\ 1112 /bin/false; \ 1113 fi; 1114endif 1115 1116prepare1: prepare3 outputmakefile asm-generic $(version_h) $(autoksyms_h) \ 1117 include/generated/utsrelease.h 1118 $(cmd_crmodverdir) 1119 1120archprepare: archheaders archscripts prepare1 scripts 1121 1122prepare0: archprepare 1123 $(Q)$(MAKE) $(build)=scripts/mod 1124 $(Q)$(MAKE) $(build)=. 1125 1126# All the preparing.. 1127prepare: prepare0 prepare-objtool 1128 1129# Support for using generic headers in asm-generic 1130asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj 1131 1132PHONY += asm-generic uapi-asm-generic 1133asm-generic: uapi-asm-generic 1134 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1135 generic=include/asm-generic 1136uapi-asm-generic: 1137 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1138 generic=include/uapi/asm-generic 1139 1140PHONY += prepare-objtool 1141prepare-objtool: $(objtool_target) 1142ifeq ($(SKIP_STACK_VALIDATION),1) 1143ifdef CONFIG_UNWINDER_ORC 1144 @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1145 @false 1146else 1147 @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1148endif 1149endif 1150 1151# Generate some files 1152# --------------------------------------------------------------------------- 1153 1154# KERNELRELEASE can change from a few different places, meaning version.h 1155# needs to be updated, so this check is forced on all builds 1156 1157uts_len := 64 1158define filechk_utsrelease.h 1159 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1160 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1161 exit 1; \ 1162 fi; \ 1163 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1164endef 1165 1166define filechk_version.h 1167 echo \#define LINUX_VERSION_CODE $(shell \ 1168 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \ 1169 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))' 1170endef 1171 1172$(version_h): FORCE 1173 $(call filechk,version.h) 1174 $(Q)rm -f $(old_version_h) 1175 1176include/generated/utsrelease.h: include/config/kernel.release FORCE 1177 $(call filechk,utsrelease.h) 1178 1179PHONY += headerdep 1180headerdep: 1181 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1182 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1183 1184# --------------------------------------------------------------------------- 1185# Kernel headers 1186 1187#Default location for installed headers 1188export INSTALL_HDR_PATH = $(objtree)/usr 1189 1190quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1191 cmd_headers_install = \ 1192 mkdir -p $(INSTALL_HDR_PATH); \ 1193 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1194 usr/include $(INSTALL_HDR_PATH) 1195 1196PHONY += headers_install 1197headers_install: headers 1198 $(call cmd,headers_install) 1199 1200PHONY += archheaders archscripts 1201 1202hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1203 1204PHONY += headers 1205headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts 1206 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \ 1207 $(error Headers not exportable for the $(SRCARCH) architecture)) 1208 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1209 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1210 1211PHONY += headers_check 1212headers_check: headers 1213 $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1 1214 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi HDRCHECK=1 1215 1216ifdef CONFIG_HEADERS_INSTALL 1217prepare: headers 1218endif 1219 1220ifdef CONFIG_HEADERS_CHECK 1221all: headers_check 1222endif 1223 1224PHONY += scripts_unifdef 1225scripts_unifdef: scripts_basic 1226 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1227 1228# --------------------------------------------------------------------------- 1229# Kernel selftest 1230 1231PHONY += kselftest 1232kselftest: 1233 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1234 1235PHONY += kselftest-clean 1236kselftest-clean: 1237 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean 1238 1239PHONY += kselftest-merge 1240kselftest-merge: 1241 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1242 $(Q)find $(srctree)/tools/testing/selftests -name config | \ 1243 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config 1244 +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1245 1246# --------------------------------------------------------------------------- 1247# Devicetree files 1248 1249ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1250dtstree := arch/$(SRCARCH)/boot/dts 1251endif 1252 1253ifneq ($(dtstree),) 1254 1255%.dtb: prepare3 scripts_dtc 1256 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1257 1258PHONY += dtbs dtbs_install dt_binding_check 1259dtbs dtbs_check: prepare3 scripts_dtc 1260 $(Q)$(MAKE) $(build)=$(dtstree) 1261 1262dtbs_check: export CHECK_DTBS=1 1263dtbs_check: dt_binding_check 1264 1265dtbs_install: 1266 $(Q)$(MAKE) $(dtbinst)=$(dtstree) 1267 1268ifdef CONFIG_OF_EARLY_FLATTREE 1269all: dtbs 1270endif 1271 1272endif 1273 1274PHONY += scripts_dtc 1275scripts_dtc: scripts_basic 1276 $(Q)$(MAKE) $(build)=scripts/dtc 1277 1278dt_binding_check: scripts_dtc 1279 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings 1280 1281# --------------------------------------------------------------------------- 1282# Modules 1283 1284ifdef CONFIG_MODULES 1285 1286# By default, build modules as well 1287 1288all: modules 1289 1290# Build modules 1291# 1292# A module can be listed more than once in obj-m resulting in 1293# duplicate lines in modules.order files. Those are removed 1294# using awk while concatenating to the final file. 1295 1296PHONY += modules 1297modules: $(if $(KBUILD_BUILTIN),vmlinux) modules.order modules.builtin 1298 @$(kecho) ' Building modules, stage 2.'; 1299 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1300 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh 1301 1302modules.order: $(vmlinux-dirs) 1303 $(Q)$(AWK) '!x[$$0]++' $(addsuffix /$@, $(vmlinux-dirs)) > $@ 1304 1305modbuiltin-dirs := $(addprefix _modbuiltin_, $(vmlinux-dirs)) 1306 1307modules.builtin: $(modbuiltin-dirs) 1308 $(Q)$(AWK) '!x[$$0]++' $(addsuffix /$@, $(vmlinux-dirs)) > $@ 1309 1310PHONY += $(modbuiltin-dirs) 1311# tristate.conf is not included from this Makefile. Add it as a prerequisite 1312# here to make it self-healing in case somebody accidentally removes it. 1313$(modbuiltin-dirs): include/config/tristate.conf 1314 $(Q)$(MAKE) $(modbuiltin)=$(patsubst _modbuiltin_%,%,$@) 1315 1316# Target to prepare building external modules 1317PHONY += modules_prepare 1318modules_prepare: prepare 1319 1320# Target to install modules 1321PHONY += modules_install 1322modules_install: _modinst_ _modinst_post 1323 1324PHONY += _modinst_ 1325_modinst_: 1326 @rm -rf $(MODLIB)/kernel 1327 @rm -f $(MODLIB)/source 1328 @mkdir -p $(MODLIB)/kernel 1329 @ln -s $(abspath $(srctree)) $(MODLIB)/source 1330 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1331 rm -f $(MODLIB)/build ; \ 1332 ln -s $(CURDIR) $(MODLIB)/build ; \ 1333 fi 1334 @cp -f $(objtree)/modules.order $(MODLIB)/ 1335 @cp -f $(objtree)/modules.builtin $(MODLIB)/ 1336 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/ 1337 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1338 1339# This depmod is only for convenience to give the initial 1340# boot a modules.dep even before / is mounted read-write. However the 1341# boot script depmod is the master version. 1342PHONY += _modinst_post 1343_modinst_post: _modinst_ 1344 $(call cmd,depmod) 1345 1346ifeq ($(CONFIG_MODULE_SIG), y) 1347PHONY += modules_sign 1348modules_sign: 1349 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign 1350endif 1351 1352else # CONFIG_MODULES 1353 1354# Modules not configured 1355# --------------------------------------------------------------------------- 1356 1357PHONY += modules modules_install 1358modules modules_install: 1359 @echo >&2 1360 @echo >&2 "The present kernel configuration has modules disabled." 1361 @echo >&2 "Type 'make config' and enable loadable module support." 1362 @echo >&2 "Then build a kernel with module support enabled." 1363 @echo >&2 1364 @exit 1 1365 1366endif # CONFIG_MODULES 1367 1368### 1369# Cleaning is done on three levels. 1370# make clean Delete most generated files 1371# Leave enough to build external modules 1372# make mrproper Delete the current configuration, and all generated files 1373# make distclean Remove editor backup files, patch leftover files and the like 1374 1375# Directories & files removed with 'make clean' 1376CLEAN_DIRS += $(MODVERDIR) include/ksym 1377CLEAN_FILES += modules.builtin.modinfo 1378 1379# Directories & files removed with 'make mrproper' 1380MRPROPER_DIRS += include/config include/generated \ 1381 arch/$(SRCARCH)/include/generated .tmp_objdiff 1382MRPROPER_FILES += .config .config.old .version \ 1383 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \ 1384 signing_key.pem signing_key.priv signing_key.x509 \ 1385 x509.genkey extra_certificates signing_key.x509.keyid \ 1386 signing_key.x509.signer vmlinux-gdb.py 1387 1388# clean - Delete most, but leave enough to build external modules 1389# 1390clean: rm-dirs := $(CLEAN_DIRS) 1391clean: rm-files := $(CLEAN_FILES) 1392clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs)) 1393 1394PHONY += $(clean-dirs) clean archclean vmlinuxclean 1395$(clean-dirs): 1396 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1397 1398vmlinuxclean: 1399 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1400 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1401 1402clean: archclean vmlinuxclean 1403 1404# mrproper - Delete all generated files, including .config 1405# 1406mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS)) 1407mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1408mrproper-dirs := $(addprefix _mrproper_,scripts) 1409 1410PHONY += $(mrproper-dirs) mrproper 1411$(mrproper-dirs): 1412 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1413 1414mrproper: clean $(mrproper-dirs) 1415 $(call cmd,rmdirs) 1416 $(call cmd,rmfiles) 1417 1418# distclean 1419# 1420PHONY += distclean 1421 1422distclean: mrproper 1423 @find $(srctree) $(RCS_FIND_IGNORE) \ 1424 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1425 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1426 -o -name 'core' \) \ 1427 -type f -print | xargs rm -f 1428 1429 1430# Packaging of the kernel to various formats 1431# --------------------------------------------------------------------------- 1432package-dir := scripts/package 1433 1434%src-pkg: FORCE 1435 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1436%pkg: include/config/kernel.release FORCE 1437 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1438 1439 1440# Brief documentation of the typical targets used 1441# --------------------------------------------------------------------------- 1442 1443boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1444boards := $(sort $(notdir $(boards))) 1445board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1446board-dirs := $(sort $(notdir $(board-dirs:/=))) 1447 1448PHONY += help 1449help: 1450 @echo 'Cleaning targets:' 1451 @echo ' clean - Remove most generated files but keep the config and' 1452 @echo ' enough build support to build external modules' 1453 @echo ' mrproper - Remove all generated files + config + various backup files' 1454 @echo ' distclean - mrproper + remove editor backup and patch files' 1455 @echo '' 1456 @echo 'Configuration targets:' 1457 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1458 @echo '' 1459 @echo 'Other generic targets:' 1460 @echo ' all - Build all targets marked with [*]' 1461 @echo '* vmlinux - Build the bare kernel' 1462 @echo '* modules - Build all modules' 1463 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1464 @echo ' dir/ - Build all files in dir and below' 1465 @echo ' dir/file.[ois] - Build specified target only' 1466 @echo ' dir/file.ll - Build the LLVM assembly file' 1467 @echo ' (requires compiler support for LLVM assembly generation)' 1468 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1469 @echo ' (requires a recent binutils and recent build (System.map))' 1470 @echo ' dir/file.ko - Build module including final link' 1471 @echo ' modules_prepare - Set up for building external modules' 1472 @echo ' tags/TAGS - Generate tags file for editors' 1473 @echo ' cscope - Generate cscope index' 1474 @echo ' gtags - Generate GNU GLOBAL index' 1475 @echo ' kernelrelease - Output the release version string (use with make -s)' 1476 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1477 @echo ' image_name - Output the image name (use with make -s)' 1478 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1479 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1480 echo '' 1481 @echo 'Static analysers:' 1482 @echo ' checkstack - Generate a list of stack hogs' 1483 @echo ' namespacecheck - Name space analysis on compiled kernel' 1484 @echo ' versioncheck - Sanity check on version.h usage' 1485 @echo ' includecheck - Check for duplicate included header files' 1486 @echo ' export_report - List the usages of all exported symbols' 1487 @echo ' headers_check - Sanity check on exported headers' 1488 @echo ' headerdep - Detect inclusion cycles in headers' 1489 @echo ' coccicheck - Check with Coccinelle' 1490 @echo '' 1491 @echo 'Kernel selftest:' 1492 @echo ' kselftest - Build and run kernel selftest (run as root)' 1493 @echo ' Build, install, and boot kernel before' 1494 @echo ' running kselftest on it' 1495 @echo ' kselftest-clean - Remove all generated kselftest files' 1496 @echo ' kselftest-merge - Merge all the config dependencies of kselftest to existing' 1497 @echo ' .config.' 1498 @echo '' 1499 @$(if $(dtstree), \ 1500 echo 'Devicetree:'; \ 1501 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1502 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1503 echo '') 1504 1505 @echo 'Userspace tools targets:' 1506 @echo ' use "make tools/help"' 1507 @echo ' or "cd tools; make help"' 1508 @echo '' 1509 @echo 'Kernel packaging:' 1510 @$(MAKE) $(build)=$(package-dir) help 1511 @echo '' 1512 @echo 'Documentation targets:' 1513 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1514 @echo '' 1515 @echo 'Architecture specific targets ($(SRCARCH)):' 1516 @$(if $(archhelp),$(archhelp),\ 1517 echo ' No architecture specific help defined for $(SRCARCH)') 1518 @echo '' 1519 @$(if $(boards), \ 1520 $(foreach b, $(boards), \ 1521 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1522 echo '') 1523 @$(if $(board-dirs), \ 1524 $(foreach b, $(board-dirs), \ 1525 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1526 printf " %-16s - Show all of the above\\n" help-boards; \ 1527 echo '') 1528 1529 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1530 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1531 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1532 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK (sparse by default)' 1533 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1534 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1535 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where' 1536 @echo ' 1: warnings which may be relevant and do not occur too often' 1537 @echo ' 2: warnings which occur quite often but may still be relevant' 1538 @echo ' 3: more obscure warnings, can most likely be ignored' 1539 @echo ' Multiple levels can be combined with W=12 or W=123' 1540 @echo '' 1541 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1542 @echo 'For further info see the ./README file' 1543 1544 1545help-board-dirs := $(addprefix help-,$(board-dirs)) 1546 1547help-boards: $(help-board-dirs) 1548 1549boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1550 1551$(help-board-dirs): help-%: 1552 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1553 @$(if $(boards-per-dir), \ 1554 $(foreach b, $(boards-per-dir), \ 1555 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1556 echo '') 1557 1558 1559# Documentation targets 1560# --------------------------------------------------------------------------- 1561DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1562 linkcheckdocs dochelp refcheckdocs 1563PHONY += $(DOC_TARGETS) 1564$(DOC_TARGETS): scripts_basic FORCE 1565 $(Q)$(MAKE) $(build)=Documentation $@ 1566 1567# Misc 1568# --------------------------------------------------------------------------- 1569 1570PHONY += scripts_gdb 1571scripts_gdb: prepare0 1572 $(Q)$(MAKE) $(build)=scripts/gdb 1573 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1574 1575ifdef CONFIG_GDB_SCRIPTS 1576all: scripts_gdb 1577endif 1578 1579else # KBUILD_EXTMOD 1580 1581### 1582# External module support. 1583# When building external modules the kernel used as basis is considered 1584# read-only, and no consistency checks are made and the make 1585# system is not used on the basis kernel. If updates are required 1586# in the basis kernel ordinary make commands (without M=...) must 1587# be used. 1588# 1589# The following are the only valid targets when building external 1590# modules. 1591# make M=dir clean Delete all automatically generated files 1592# make M=dir modules Make all modules in specified dir 1593# make M=dir Same as 'make M=dir modules' 1594# make M=dir modules_install 1595# Install the modules built in the module directory 1596# Assumes install directory is already created 1597 1598# We are always building modules 1599KBUILD_MODULES := 1 1600 1601PHONY += $(objtree)/Module.symvers 1602$(objtree)/Module.symvers: 1603 @test -e $(objtree)/Module.symvers || ( \ 1604 echo; \ 1605 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \ 1606 echo " is missing; modules will have no dependencies and modversions."; \ 1607 echo ) 1608 1609module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD)) 1610PHONY += $(module-dirs) modules 1611$(module-dirs): prepare $(objtree)/Module.symvers 1612 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@) 1613 1614modules: $(module-dirs) 1615 @$(kecho) ' Building modules, stage 2.'; 1616 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1617 1618PHONY += modules_install 1619modules_install: _emodinst_ _emodinst_post 1620 1621install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra) 1622PHONY += _emodinst_ 1623_emodinst_: 1624 $(Q)mkdir -p $(MODLIB)/$(install-dir) 1625 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1626 1627PHONY += _emodinst_post 1628_emodinst_post: _emodinst_ 1629 $(call cmd,depmod) 1630 1631clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD)) 1632 1633PHONY += $(clean-dirs) clean 1634$(clean-dirs): 1635 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1636 1637clean: rm-dirs := $(MODVERDIR) 1638clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers 1639 1640PHONY += help 1641help: 1642 @echo ' Building external modules.' 1643 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1644 @echo '' 1645 @echo ' modules - default target, build the module(s)' 1646 @echo ' modules_install - install the module' 1647 @echo ' clean - remove generated files in module directory only' 1648 @echo '' 1649 1650PHONY += prepare 1651prepare: 1652 $(cmd_crmodverdir) 1653endif # KBUILD_EXTMOD 1654 1655clean: $(clean-dirs) 1656 $(call cmd,rmdirs) 1657 $(call cmd,rmfiles) 1658 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1659 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \ 1660 -o -name '*.ko.*' \ 1661 -o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \ 1662 -o -name '*.dwo' -o -name '*.lst' \ 1663 -o -name '*.su' \ 1664 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1665 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 1666 -o -name '*.asn1.[ch]' \ 1667 -o -name '*.symtypes' -o -name 'modules.order' \ 1668 -o -name modules.builtin -o -name '.tmp_*.o.*' \ 1669 -o -name '*.c.[012]*.*' \ 1670 -o -name '*.ll' \ 1671 -o -name '*.gcno' \) -type f -print | xargs rm -f 1672 1673# Generate tags for editors 1674# --------------------------------------------------------------------------- 1675quiet_cmd_tags = GEN $@ 1676 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@ 1677 1678tags TAGS cscope gtags: FORCE 1679 $(call cmd,tags) 1680 1681# Scripts to check various things for consistency 1682# --------------------------------------------------------------------------- 1683 1684PHONY += includecheck versioncheck coccicheck namespacecheck export_report 1685 1686includecheck: 1687 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1688 -name '*.[hcS]' -type f -print | sort \ 1689 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1690 1691versioncheck: 1692 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1693 -name '*.[hcS]' -type f -print | sort \ 1694 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1695 1696coccicheck: 1697 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@ 1698 1699namespacecheck: 1700 $(PERL) $(srctree)/scripts/namespace.pl 1701 1702export_report: 1703 $(PERL) $(srctree)/scripts/export_report.pl 1704 1705PHONY += checkstack kernelrelease kernelversion image_name 1706 1707# UML needs a little special treatment here. It wants to use the host 1708# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1709# else wants $(ARCH), including people doing cross-builds, which means 1710# that $(SUBARCH) doesn't work here. 1711ifeq ($(ARCH), um) 1712CHECKSTACK_ARCH := $(SUBARCH) 1713else 1714CHECKSTACK_ARCH := $(ARCH) 1715endif 1716checkstack: 1717 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1718 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1719 1720kernelrelease: 1721 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1722 1723kernelversion: 1724 @echo $(KERNELVERSION) 1725 1726image_name: 1727 @echo $(KBUILD_IMAGE) 1728 1729# Clear a bunch of variables before executing the submake 1730 1731ifeq ($(quiet),silent_) 1732tools_silent=s 1733endif 1734 1735tools/: FORCE 1736 $(Q)mkdir -p $(objtree)/tools 1737 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1738 1739tools/%: FORCE 1740 $(Q)mkdir -p $(objtree)/tools 1741 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1742 1743# Single targets 1744# --------------------------------------------------------------------------- 1745# Single targets are compatible with: 1746# - build with mixed source and output 1747# - build with separate output dir 'make O=...' 1748# - external modules 1749# 1750# target-dir => where to store outputfile 1751# build-dir => directory in kernel source tree to use 1752 1753build-target = $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD)/)$@ 1754build-dir = $(patsubst %/,%,$(dir $(build-target))) 1755 1756%.i: prepare FORCE 1757 $(Q)$(MAKE) $(build)=$(build-dir) $(build-target) 1758%.ll: prepare FORCE 1759 $(Q)$(MAKE) $(build)=$(build-dir) $(build-target) 1760%.lst: prepare FORCE 1761 $(Q)$(MAKE) $(build)=$(build-dir) $(build-target) 1762%.o: prepare FORCE 1763 $(Q)$(MAKE) $(build)=$(build-dir) $(build-target) 1764%.s: prepare FORCE 1765 $(Q)$(MAKE) $(build)=$(build-dir) $(build-target) 1766%.symtypes: prepare FORCE 1767 $(Q)$(MAKE) $(build)=$(build-dir) $(build-target) 1768%.ko: %.o 1769 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1770 1771# Modules 1772PHONY += / 1773/: ./ 1774 1775%/: prepare FORCE 1776 $(Q)$(MAKE) KBUILD_MODULES=1 $(build)=$(build-dir) 1777 1778# FIXME Should go into a make.lib or something 1779# =========================================================================== 1780 1781quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs))) 1782 cmd_rmdirs = rm -rf $(rm-dirs) 1783 1784quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1785 cmd_rmfiles = rm -f $(rm-files) 1786 1787# Run depmod only if we have System.map and depmod is executable 1788quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) 1789 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1790 $(KERNELRELEASE) 1791 1792# Create temporary dir for module support files 1793# clean it up only when building all modules 1794cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \ 1795 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*) 1796 1797# read saved command lines for existing targets 1798existing-targets := $(wildcard $(sort $(targets))) 1799 1800-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 1801 1802endif # ifeq ($(config-targets),1) 1803endif # ifeq ($(mixed-targets),1) 1804endif # need-sub-make 1805 1806PHONY += FORCE 1807FORCE: 1808 1809# Declare the contents of the PHONY variable as phony. We keep that 1810# information in a variable so we can use it in if_changed and friends. 1811.PHONY: $(PHONY) 1812