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- # SPDX-License-Identifier: GPL-2.0
- VERSION = 5
- PATCHLEVEL = 17
- SUBLEVEL = 0
- EXTRAVERSION =
- NAME = Superb Owl
- # *DOCUMENTATION*
- # To see a list of typical targets execute "make help"
- # More info can be located in ./README
- # Comments in this file are targeted only to the developer, do not
- # expect to learn how to build the kernel reading this file.
- $(if $(filter __%, $(MAKECMDGOALS)), \
- $(error targets prefixed with '__' are only for internal use))
- # That's our default target when none is given on the command line
- PHONY := __all
- __all:
- # We are using a recursive build, so we need to do a little thinking
- # to get the ordering right.
- #
- # Most importantly: sub-Makefiles should only ever modify files in
- # their own directory. If in some directory we have a dependency on
- # a file in another dir (which doesn't happen often, but it's often
- # unavoidable when linking the built-in.a targets which finally
- # turn into vmlinux), we will call a sub make in that other dir, and
- # after that we are sure that everything which is in that other dir
- # is now up to date.
- #
- # The only cases where we need to modify files which have global
- # effects are thus separated out and done before the recursive
- # descending is started. They are now explicitly listed as the
- # prepare rule.
- ifneq ($(sub_make_done),1)
- # Do not use make's built-in rules and variables
- # (this increases performance and avoids hard-to-debug behaviour)
- MAKEFLAGS += -rR
- # Avoid funny character set dependencies
- unexport LC_ALL
- LC_COLLATE=C
- LC_NUMERIC=C
- export LC_COLLATE LC_NUMERIC
- # Avoid interference with shell env settings
- unexport GREP_OPTIONS
- # Beautify output
- # ---------------------------------------------------------------------------
- #
- # Normally, we echo the whole command before executing it. By making
- # that echo $($(quiet)$(cmd)), we now have the possibility to set
- # $(quiet) to choose other forms of output instead, e.g.
- #
- # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
- # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
- #
- # If $(quiet) is empty, the whole command will be printed.
- # If it is set to "quiet_", only the short version will be printed.
- # If it is set to "silent_", nothing will be printed at all, since
- # the variable $(silent_cmd_cc_o_c) doesn't exist.
- #
- # A simple variant is to prefix commands with $(Q) - that's useful
- # for commands that shall be hidden in non-verbose mode.
- #
- # $(Q)ln $@ :<
- #
- # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
- # If KBUILD_VERBOSE equals 1 then the above command is displayed.
- # If KBUILD_VERBOSE equals 2 then give the reason why each target is rebuilt.
- #
- # To put more focus on warnings, be less verbose as default
- # Use 'make V=1' to see the full commands
- ifeq ("$(origin V)", "command line")
- KBUILD_VERBOSE = $(V)
- endif
- ifndef KBUILD_VERBOSE
- KBUILD_VERBOSE = 0
- endif
- ifeq ($(KBUILD_VERBOSE),1)
- quiet =
- Q =
- else
- quiet=quiet_
- Q = @
- endif
- # If the user is running make -s (silent mode), suppress echoing of
- # commands
- ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
- quiet=silent_
- KBUILD_VERBOSE = 0
- endif
- export quiet Q KBUILD_VERBOSE
- # Call a source code checker (by default, "sparse") as part of the
- # C compilation.
- #
- # Use 'make C=1' to enable checking of only re-compiled files.
- # Use 'make C=2' to enable checking of *all* source files, regardless
- # of whether they are re-compiled or not.
- #
- # See the file "Documentation/dev-tools/sparse.rst" for more details,
- # including where to get the "sparse" utility.
- ifeq ("$(origin C)", "command line")
- KBUILD_CHECKSRC = $(C)
- endif
- ifndef KBUILD_CHECKSRC
- KBUILD_CHECKSRC = 0
- endif
- export KBUILD_CHECKSRC
- # Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the
- # directory of external module to build. Setting M= takes precedence.
- ifeq ("$(origin M)", "command line")
- KBUILD_EXTMOD := $(M)
- endif
- $(if $(word 2, $(KBUILD_EXTMOD)), \
- $(error building multiple external modules is not supported))
- # Remove trailing slashes
- ifneq ($(filter %/, $(KBUILD_EXTMOD)),)
- KBUILD_EXTMOD := $(shell dirname $(KBUILD_EXTMOD).)
- endif
- export KBUILD_EXTMOD
- # Kbuild will save output files in the current working directory.
- # This does not need to match to the root of the kernel source tree.
- #
- # For example, you can do this:
- #
- # cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile
- #
- # If you want to save output files in a different location, there are
- # two syntaxes to specify it.
- #
- # 1) O=
- # Use "make O=dir/to/store/output/files/"
- #
- # 2) Set KBUILD_OUTPUT
- # Set the environment variable KBUILD_OUTPUT to point to the output directory.
- # export KBUILD_OUTPUT=dir/to/store/output/files/; make
- #
- # The O= assignment takes precedence over the KBUILD_OUTPUT environment
- # variable.
- # Do we want to change the working directory?
- ifeq ("$(origin O)", "command line")
- KBUILD_OUTPUT := $(O)
- endif
- ifneq ($(KBUILD_OUTPUT),)
- # Make's built-in functions such as $(abspath ...), $(realpath ...) cannot
- # expand a shell special character '~'. We use a somewhat tedious way here.
- abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd)
- $(if $(abs_objtree),, \
- $(error failed to create output directory "$(KBUILD_OUTPUT)"))
- # $(realpath ...) resolves symlinks
- abs_objtree := $(realpath $(abs_objtree))
- else
- abs_objtree := $(CURDIR)
- endif # ifneq ($(KBUILD_OUTPUT),)
- ifeq ($(abs_objtree),$(CURDIR))
- # Suppress "Entering directory ..." unless we are changing the work directory.
- MAKEFLAGS += --no-print-directory
- else
- need-sub-make := 1
- endif
- this-makefile := $(lastword $(MAKEFILE_LIST))
- abs_srctree := $(realpath $(dir $(this-makefile)))
- ifneq ($(words $(subst :, ,$(abs_srctree))), 1)
- $(error source directory cannot contain spaces or colons)
- endif
- ifneq ($(abs_srctree),$(abs_objtree))
- # Look for make include files relative to root of kernel src
- #
- # --included-dir is added for backward compatibility, but you should not rely on
- # it. Please add $(srctree)/ prefix to include Makefiles in the source tree.
- MAKEFLAGS += --include-dir=$(abs_srctree)
- endif
- ifneq ($(filter 3.%,$(MAKE_VERSION)),)
- # 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
- # We need to invoke sub-make to avoid implicit rules in the top Makefile.
- need-sub-make := 1
- # Cancel implicit rules for this Makefile.
- $(this-makefile): ;
- endif
- export abs_srctree abs_objtree
- export sub_make_done := 1
- ifeq ($(need-sub-make),1)
- PHONY += $(MAKECMDGOALS) __sub-make
- $(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make
- @:
- # Invoke a second make in the output directory, passing relevant variables
- __sub-make:
- $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS)
- endif # need-sub-make
- endif # sub_make_done
- # We process the rest of the Makefile if this is the final invocation of make
- ifeq ($(need-sub-make),)
- # Do not print "Entering directory ...",
- # but we want to display it when entering to the output directory
- # so that IDEs/editors are able to understand relative filenames.
- MAKEFLAGS += --no-print-directory
- ifeq ($(abs_srctree),$(abs_objtree))
- # building in the source tree
- srctree := .
- building_out_of_srctree :=
- else
- ifeq ($(abs_srctree)/,$(dir $(abs_objtree)))
- # building in a subdirectory of the source tree
- srctree := ..
- else
- srctree := $(abs_srctree)
- endif
- building_out_of_srctree := 1
- endif
- ifneq ($(KBUILD_ABS_SRCTREE),)
- srctree := $(abs_srctree)
- endif
- objtree := .
- VPATH := $(srctree)
- export building_out_of_srctree srctree objtree VPATH
- # To make sure we do not include .config for any of the *config targets
- # catch them early, and hand them over to scripts/kconfig/Makefile
- # It is allowed to specify more targets when calling make, including
- # mixing *config targets and build targets.
- # For example 'make oldconfig all'.
- # Detect when mixed targets is specified, and make a second invocation
- # of make so .config is not included in this case either (for *config).
- version_h := include/generated/uapi/linux/version.h
- clean-targets := %clean mrproper cleandocs
- no-dot-config-targets := $(clean-targets) \
- cscope gtags TAGS tags help% %docs check% coccicheck \
- $(version_h) headers headers_% archheaders archscripts \
- %asm-generic kernelversion %src-pkg dt_binding_check \
- outputmakefile
- # Installation targets should not require compiler. Unfortunately, vdso_install
- # is an exception where build artifacts may be updated. This must be fixed.
- no-compiler-targets := $(no-dot-config-targets) install dtbs_install \
- headers_install modules_install kernelrelease image_name
- no-sync-config-targets := $(no-dot-config-targets) %install kernelrelease \
- image_name
- single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/
- config-build :=
- mixed-build :=
- need-config := 1
- need-compiler := 1
- may-sync-config := 1
- single-build :=
- ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
- ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
- need-config :=
- endif
- endif
- ifneq ($(filter $(no-compiler-targets), $(MAKECMDGOALS)),)
- ifeq ($(filter-out $(no-compiler-targets), $(MAKECMDGOALS)),)
- need-compiler :=
- endif
- endif
- ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
- ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
- may-sync-config :=
- endif
- endif
- ifneq ($(KBUILD_EXTMOD),)
- may-sync-config :=
- endif
- ifeq ($(KBUILD_EXTMOD),)
- ifneq ($(filter %config,$(MAKECMDGOALS)),)
- config-build := 1
- ifneq ($(words $(MAKECMDGOALS)),1)
- mixed-build := 1
- endif
- endif
- endif
- # We cannot build single targets and the others at the same time
- ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),)
- single-build := 1
- ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),)
- mixed-build := 1
- endif
- endif
- # For "make -j clean all", "make -j mrproper defconfig all", etc.
- ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
- ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
- mixed-build := 1
- endif
- endif
- # install and modules_install need also be processed one by one
- ifneq ($(filter install,$(MAKECMDGOALS)),)
- ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
- mixed-build := 1
- endif
- endif
- ifdef mixed-build
- # ===========================================================================
- # We're called with mixed targets (*config and build targets).
- # Handle them one by one.
- PHONY += $(MAKECMDGOALS) __build_one_by_one
- $(MAKECMDGOALS): __build_one_by_one
- @:
- __build_one_by_one:
- $(Q)set -e; \
- for i in $(MAKECMDGOALS); do \
- $(MAKE) -f $(srctree)/Makefile $$i; \
- done
- else # !mixed-build
- include $(srctree)/scripts/Kbuild.include
- # Read KERNELRELEASE from include/config/kernel.release (if it exists)
- KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
- KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
- export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
- include $(srctree)/scripts/subarch.include
- # Cross compiling and selecting different set of gcc/bin-utils
- # ---------------------------------------------------------------------------
- #
- # When performing cross compilation for other architectures ARCH shall be set
- # to the target architecture. (See arch/* for the possibilities).
- # ARCH can be set during invocation of make:
- # make ARCH=ia64
- # Another way is to have ARCH set in the environment.
- # The default ARCH is the host where make is executed.
- # CROSS_COMPILE specify the prefix used for all executables used
- # during compilation. Only gcc and related bin-utils executables
- # are prefixed with $(CROSS_COMPILE).
- # CROSS_COMPILE can be set on the command line
- # make CROSS_COMPILE=ia64-linux-
- # Alternatively CROSS_COMPILE can be set in the environment.
- # Default value for CROSS_COMPILE is not to prefix executables
- # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
- ARCH ?= $(SUBARCH)
- # Architecture as present in compile.h
- UTS_MACHINE := $(ARCH)
- SRCARCH := $(ARCH)
- # Additional ARCH settings for x86
- ifeq ($(ARCH),i386)
- SRCARCH := x86
- endif
- ifeq ($(ARCH),x86_64)
- SRCARCH := x86
- endif
- # Additional ARCH settings for sparc
- ifeq ($(ARCH),sparc32)
- SRCARCH := sparc
- endif
- ifeq ($(ARCH),sparc64)
- SRCARCH := sparc
- endif
- # Additional ARCH settings for parisc
- ifeq ($(ARCH),parisc64)
- SRCARCH := parisc
- endif
- export cross_compiling :=
- ifneq ($(SRCARCH),$(SUBARCH))
- cross_compiling := 1
- endif
- KCONFIG_CONFIG ?= .config
- export KCONFIG_CONFIG
- # SHELL used by kbuild
- CONFIG_SHELL := sh
- HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
- HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
- HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
- ifneq ($(LLVM),)
- HOSTCC = clang
- HOSTCXX = clang++
- else
- HOSTCC = gcc
- HOSTCXX = g++
- endif
- export KBUILD_USERCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \
- -O2 -fomit-frame-pointer -std=gnu89
- export KBUILD_USERLDFLAGS :=
- KBUILD_HOSTCFLAGS := $(KBUILD_USERCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS)
- KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
- KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
- KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
- # Make variables (CC, etc...)
- CPP = $(CC) -E
- ifneq ($(LLVM),)
- CC = clang
- LD = ld.lld
- AR = llvm-ar
- NM = llvm-nm
- OBJCOPY = llvm-objcopy
- OBJDUMP = llvm-objdump
- READELF = llvm-readelf
- STRIP = llvm-strip
- else
- CC = $(CROSS_COMPILE)gcc
- LD = $(CROSS_COMPILE)ld
- AR = $(CROSS_COMPILE)ar
- NM = $(CROSS_COMPILE)nm
- OBJCOPY = $(CROSS_COMPILE)objcopy
- OBJDUMP = $(CROSS_COMPILE)objdump
- READELF = $(CROSS_COMPILE)readelf
- STRIP = $(CROSS_COMPILE)strip
- endif
- PAHOLE = pahole
- RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids
- LEX = flex
- YACC = bison
- AWK = awk
- INSTALLKERNEL := installkernel
- DEPMOD = depmod
- PERL = perl
- PYTHON3 = python3
- CHECK = sparse
- BASH = bash
- KGZIP = gzip
- KBZIP2 = bzip2
- KLZOP = lzop
- LZMA = lzma
- LZ4 = lz4c
- XZ = xz
- ZSTD = zstd
- PAHOLE_FLAGS = $(shell PAHOLE=$(PAHOLE) $(srctree)/scripts/pahole-flags.sh)
- CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
- -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
- NOSTDINC_FLAGS :=
- CFLAGS_MODULE =
- AFLAGS_MODULE =
- LDFLAGS_MODULE =
- CFLAGS_KERNEL =
- AFLAGS_KERNEL =
- LDFLAGS_vmlinux =
- # Use USERINCLUDE when you must reference the UAPI directories only.
- USERINCLUDE := \
- -I$(srctree)/arch/$(SRCARCH)/include/uapi \
- -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
- -I$(srctree)/include/uapi \
- -I$(objtree)/include/generated/uapi \
- -include $(srctree)/include/linux/compiler-version.h \
- -include $(srctree)/include/linux/kconfig.h
- # Use LINUXINCLUDE when you must reference the include/ directory.
- # Needed to be compatible with the O= option
- LINUXINCLUDE := \
- -I$(srctree)/arch/$(SRCARCH)/include \
- -I$(objtree)/arch/$(SRCARCH)/include/generated \
- $(if $(building_out_of_srctree),-I$(srctree)/include) \
- -I$(objtree)/include \
- $(USERINCLUDE)
- KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE
- KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
- -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \
- -Werror=implicit-function-declaration -Werror=implicit-int \
- -Werror=return-type -Wno-format-security \
- -std=gnu89
- KBUILD_CPPFLAGS := -D__KERNEL__
- KBUILD_AFLAGS_KERNEL :=
- KBUILD_CFLAGS_KERNEL :=
- KBUILD_AFLAGS_MODULE := -DMODULE
- KBUILD_CFLAGS_MODULE := -DMODULE
- KBUILD_LDFLAGS_MODULE :=
- KBUILD_LDFLAGS :=
- CLANG_FLAGS :=
- export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC
- export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL
- export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
- export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD
- export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
- export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
- export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
- export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
- export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
- export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
- export PAHOLE_FLAGS
- # Files to ignore in find ... statements
- export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
- -name CVS -o -name .pc -o -name .hg -o -name .git \) \
- -prune -o
- export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
- --exclude CVS --exclude .pc --exclude .hg --exclude .git
- # ===========================================================================
- # Rules shared between *config targets and build targets
- # Basic helpers built in scripts/basic/
- PHONY += scripts_basic
- scripts_basic:
- $(Q)$(MAKE) $(build)=scripts/basic
- PHONY += outputmakefile
- ifdef building_out_of_srctree
- # Before starting out-of-tree build, make sure the source tree is clean.
- # outputmakefile generates a Makefile in the output directory, if using a
- # separate output directory. This allows convenient use of make in the
- # output directory.
- # At the same time when output Makefile generated, generate .gitignore to
- # ignore whole output directory
- quiet_cmd_makefile = GEN Makefile
- cmd_makefile = { \
- echo "\# Automatically generated by $(srctree)/Makefile: don't edit"; \
- echo "include $(srctree)/Makefile"; \
- } > Makefile
- outputmakefile:
- $(Q)if [ -f $(srctree)/.config -o \
- -d $(srctree)/include/config -o \
- -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
- echo >&2 "***"; \
- echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \
- echo >&2 "*** in $(abs_srctree)";\
- echo >&2 "***"; \
- false; \
- fi
- $(Q)ln -fsn $(srctree) source
- $(call cmd,makefile)
- $(Q)test -e .gitignore || \
- { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
- endif
- # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
- # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
- # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
- # and from include/config/auto.conf.cmd to detect the compiler upgrade.
- CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1))
- ifneq ($(findstring clang,$(CC_VERSION_TEXT)),)
- include $(srctree)/scripts/Makefile.clang
- endif
- # Include this also for config targets because some architectures need
- # cc-cross-prefix to determine CROSS_COMPILE.
- ifdef need-compiler
- include $(srctree)/scripts/Makefile.compiler
- endif
- ifdef config-build
- # ===========================================================================
- # *config targets only - make sure prerequisites are updated, and descend
- # in scripts/kconfig to make the *config target
- # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
- # KBUILD_DEFCONFIG may point out an alternative default configuration
- # used for 'make defconfig'
- include $(srctree)/arch/$(SRCARCH)/Makefile
- export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
- config: outputmakefile scripts_basic FORCE
- $(Q)$(MAKE) $(build)=scripts/kconfig $@
- %config: outputmakefile scripts_basic FORCE
- $(Q)$(MAKE) $(build)=scripts/kconfig $@
- else #!config-build
- # ===========================================================================
- # Build targets only - this includes vmlinux, arch specific targets, clean
- # targets and others. In general all targets except *config targets.
- # If building an external module we do not care about the all: rule
- # but instead __all depend on modules
- PHONY += all
- ifeq ($(KBUILD_EXTMOD),)
- __all: all
- else
- __all: modules
- endif
- # Decide whether to build built-in, modular, or both.
- # Normally, just do built-in.
- KBUILD_MODULES :=
- KBUILD_BUILTIN := 1
- # If we have only "make modules", don't compile built-in objects.
- ifeq ($(MAKECMDGOALS),modules)
- KBUILD_BUILTIN :=
- endif
- # If we have "make <whatever> modules", compile modules
- # in addition to whatever we do anyway.
- # Just "make" or "make all" shall build modules as well
- ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),)
- KBUILD_MODULES := 1
- endif
- ifeq ($(MAKECMDGOALS),)
- KBUILD_MODULES := 1
- endif
- export KBUILD_MODULES KBUILD_BUILTIN
- ifdef need-config
- include include/config/auto.conf
- endif
- ifeq ($(KBUILD_EXTMOD),)
- # Objects we will link into vmlinux / subdirs we need to visit
- core-y := init/ usr/ arch/$(SRCARCH)/
- drivers-y := drivers/ sound/
- drivers-$(CONFIG_SAMPLES) += samples/
- drivers-$(CONFIG_NET) += net/
- drivers-y += virt/
- libs-y := lib/
- endif # KBUILD_EXTMOD
- # The all: target is the default when no target is given on the
- # command line.
- # This allow a user to issue only 'make' to build a kernel including modules
- # Defaults to vmlinux, but the arch makefile usually adds further targets
- all: vmlinux
- CFLAGS_GCOV := -fprofile-arcs -ftest-coverage
- ifdef CONFIG_CC_IS_GCC
- CFLAGS_GCOV += -fno-tree-loop-im
- endif
- export CFLAGS_GCOV
- # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
- ifdef CONFIG_FUNCTION_TRACER
- CC_FLAGS_FTRACE := -pg
- endif
- include $(srctree)/arch/$(SRCARCH)/Makefile
- ifdef need-config
- ifdef may-sync-config
- # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
- # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
- # because some architectures define CROSS_COMPILE there.
- include include/config/auto.conf.cmd
- $(KCONFIG_CONFIG):
- @echo >&2 '***'
- @echo >&2 '*** Configuration file "$@" not found!'
- @echo >&2 '***'
- @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
- @echo >&2 '*** "make menuconfig" or "make xconfig").'
- @echo >&2 '***'
- @/bin/false
- # The actual configuration files used during the build are stored in
- # include/generated/ and include/config/. Update them if .config is newer than
- # include/config/auto.conf (which mirrors .config).
- #
- # This exploits the 'multi-target pattern rule' trick.
- # The syncconfig should be executed only once to make all the targets.
- # (Note: use the grouped target '&:' when we bump to GNU Make 4.3)
- #
- # Do not use $(call cmd,...) here. That would suppress prompts from syncconfig,
- # so you cannot notice that Kconfig is waiting for the user input.
- %/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h: $(KCONFIG_CONFIG)
- $(Q)$(kecho) " SYNC $@"
- $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
- else # !may-sync-config
- # External modules and some install targets need include/generated/autoconf.h
- # and include/config/auto.conf but do not care if they are up-to-date.
- # Use auto.conf to trigger the test
- PHONY += include/config/auto.conf
- include/config/auto.conf:
- $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
- echo >&2; \
- echo >&2 " ERROR: Kernel configuration is invalid."; \
- echo >&2 " include/generated/autoconf.h or $@ are missing.";\
- echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
- echo >&2 ; \
- /bin/false)
- endif # may-sync-config
- endif # need-config
- KBUILD_CFLAGS += -fno-delete-null-pointer-checks
- KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,)
- KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation)
- KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow)
- KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
- ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
- KBUILD_CFLAGS += -O2
- else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3
- KBUILD_CFLAGS += -O3
- else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
- KBUILD_CFLAGS += -Os
- endif
- # Tell gcc to never replace conditional load with a non-conditional one
- ifdef CONFIG_CC_IS_GCC
- # gcc-10 renamed --param=allow-store-data-races=0 to
- # -fno-allow-store-data-races.
- KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
- KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races)
- endif
- ifdef CONFIG_READABLE_ASM
- # Disable optimizations that make assembler listings hard to read.
- # reorder blocks reorders the control in the function
- # ipa clone creates specialized cloned functions
- # partial inlining inlines only parts of functions
- KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining
- endif
- ifneq ($(CONFIG_FRAME_WARN),0)
- KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN)
- endif
- stackp-flags-y := -fno-stack-protector
- stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector
- stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong
- KBUILD_CFLAGS += $(stackp-flags-y)
- KBUILD_CFLAGS-$(CONFIG_WERROR) += -Werror
- KBUILD_CFLAGS += $(KBUILD_CFLAGS-y) $(CONFIG_CC_IMPLICIT_FALLTHROUGH)
- ifdef CONFIG_CC_IS_CLANG
- KBUILD_CPPFLAGS += -Qunused-arguments
- # The kernel builds with '-std=gnu89' so use of GNU extensions is acceptable.
- KBUILD_CFLAGS += -Wno-gnu
- # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
- # source of a reference will be _MergedGlobals and not on of the whitelisted names.
- # See modpost pattern 2
- KBUILD_CFLAGS += -mno-global-merge
- else
- # gcc inanely warns about local variables called 'main'
- KBUILD_CFLAGS += -Wno-main
- endif
- # These warnings generated too much noise in a regular build.
- # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
- KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
- KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
- ifdef CONFIG_FRAME_POINTER
- KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
- else
- # Some targets (ARM with Thumb2, for example), can't be built with frame
- # pointers. For those, we don't have FUNCTION_TRACER automatically
- # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
- # incompatible with -fomit-frame-pointer with current GCC, so we don't use
- # -fomit-frame-pointer with FUNCTION_TRACER.
- ifndef CONFIG_FUNCTION_TRACER
- KBUILD_CFLAGS += -fomit-frame-pointer
- endif
- endif
- # Initialize all stack variables with a 0xAA pattern.
- ifdef CONFIG_INIT_STACK_ALL_PATTERN
- KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern
- endif
- # Initialize all stack variables with a zero value.
- ifdef CONFIG_INIT_STACK_ALL_ZERO
- KBUILD_CFLAGS += -ftrivial-auto-var-init=zero
- ifdef CONFIG_CC_IS_CLANG
- # https://bugs.llvm.org/show_bug.cgi?id=45497
- KBUILD_CFLAGS += -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang
- endif
- endif
- # While VLAs have been removed, GCC produces unreachable stack probes
- # for the randomize_kstack_offset feature. Disable it for all compilers.
- KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection)
- # Clear used registers at func exit (to reduce data lifetime and ROP gadgets).
- ifdef CONFIG_ZERO_CALL_USED_REGS
- KBUILD_CFLAGS += -fzero-call-used-regs=used-gpr
- endif
- ifdef CONFIG_FUNCTION_TRACER
- ifdef CONFIG_FTRACE_MCOUNT_USE_CC
- CC_FLAGS_FTRACE += -mrecord-mcount
- ifdef CONFIG_HAVE_NOP_MCOUNT
- ifeq ($(call cc-option-yn, -mnop-mcount),y)
- CC_FLAGS_FTRACE += -mnop-mcount
- CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT
- endif
- endif
- endif
- ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL
- CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT
- endif
- ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT
- ifdef CONFIG_HAVE_C_RECORDMCOUNT
- BUILD_C_RECORDMCOUNT := y
- export BUILD_C_RECORDMCOUNT
- endif
- endif
- ifdef CONFIG_HAVE_FENTRY
- # s390-linux-gnu-gcc did not support -mfentry until gcc-9.
- ifeq ($(call cc-option-yn, -mfentry),y)
- CC_FLAGS_FTRACE += -mfentry
- CC_FLAGS_USING += -DCC_USING_FENTRY
- endif
- endif
- export CC_FLAGS_FTRACE
- KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
- KBUILD_AFLAGS += $(CC_FLAGS_USING)
- endif
- # We trigger additional mismatches with less inlining
- ifdef CONFIG_DEBUG_SECTION_MISMATCH
- KBUILD_CFLAGS += -fno-inline-functions-called-once
- endif
- ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
- KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
- LDFLAGS_vmlinux += --gc-sections
- endif
- ifdef CONFIG_SHADOW_CALL_STACK
- CC_FLAGS_SCS := -fsanitize=shadow-call-stack
- KBUILD_CFLAGS += $(CC_FLAGS_SCS)
- export CC_FLAGS_SCS
- endif
- ifdef CONFIG_LTO_CLANG
- ifdef CONFIG_LTO_CLANG_THIN
- CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit
- KBUILD_LDFLAGS += --thinlto-cache-dir=$(extmod_prefix).thinlto-cache
- else
- CC_FLAGS_LTO := -flto
- endif
- CC_FLAGS_LTO += -fvisibility=hidden
- # Limit inlining across translation units to reduce binary size
- KBUILD_LDFLAGS += -mllvm -import-instr-limit=5
- # Check for frame size exceeding threshold during prolog/epilog insertion
- # when using lld < 13.0.0.
- ifneq ($(CONFIG_FRAME_WARN),0)
- ifeq ($(shell test $(CONFIG_LLD_VERSION) -lt 130000; echo $$?),0)
- KBUILD_LDFLAGS += -plugin-opt=-warn-stack-size=$(CONFIG_FRAME_WARN)
- endif
- endif
- endif
- ifdef CONFIG_LTO
- KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO)
- KBUILD_AFLAGS += -fno-lto
- export CC_FLAGS_LTO
- endif
- ifdef CONFIG_CFI_CLANG
- CC_FLAGS_CFI := -fsanitize=cfi \
- -fsanitize-cfi-cross-dso \
- -fno-sanitize-cfi-canonical-jump-tables \
- -fno-sanitize-trap=cfi \
- -fno-sanitize-blacklist
- ifdef CONFIG_CFI_PERMISSIVE
- CC_FLAGS_CFI += -fsanitize-recover=cfi
- endif
- # If LTO flags are filtered out, we must also filter out CFI.
- CC_FLAGS_LTO += $(CC_FLAGS_CFI)
- KBUILD_CFLAGS += $(CC_FLAGS_CFI)
- export CC_FLAGS_CFI
- endif
- ifdef CONFIG_DEBUG_FORCE_FUNCTION_ALIGN_64B
- KBUILD_CFLAGS += -falign-functions=64
- endif
- # arch Makefile may override CC so keep this after arch Makefile is included
- NOSTDINC_FLAGS += -nostdinc
- # warn about C99 declaration after statement
- KBUILD_CFLAGS += -Wdeclaration-after-statement
- # Variable Length Arrays (VLAs) should not be used anywhere in the kernel
- KBUILD_CFLAGS += -Wvla
- # disable pointer signed / unsigned warnings in gcc 4.0
- KBUILD_CFLAGS += -Wno-pointer-sign
- # In order to make sure new function cast mismatches are not introduced
- # in the kernel (to avoid tripping CFI checking), the kernel should be
- # globally built with -Wcast-function-type.
- KBUILD_CFLAGS += $(call cc-option, -Wcast-function-type)
- # disable stringop warnings in gcc 8+
- KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
- # We'll want to enable this eventually, but it's not going away for 5.7 at least
- KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds)
- KBUILD_CFLAGS += -Wno-array-bounds
- KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow)
- # Another good warning that we'll want to enable eventually
- KBUILD_CFLAGS += $(call cc-disable-warning, restrict)
- # Enabled with W=2, disabled by default as noisy
- ifdef CONFIG_CC_IS_GCC
- KBUILD_CFLAGS += -Wno-maybe-uninitialized
- endif
- ifdef CONFIG_CC_IS_GCC
- # The allocators already balk at large sizes, so silence the compiler
- # warnings for bounds checks involving those possible values. While
- # -Wno-alloc-size-larger-than would normally be used here, earlier versions
- # of gcc (<9.1) weirdly don't handle the option correctly when _other_
- # warnings are produced (?!). Using -Walloc-size-larger-than=SIZE_MAX
- # doesn't work (as it is documented to), silently resolving to "0" prior to
- # version 9.1 (and producing an error more recently). Numeric values larger
- # than PTRDIFF_MAX also don't work prior to version 9.1, which are silently
- # ignored, continuing to default to PTRDIFF_MAX. So, left with no other
- # choice, we must perform a versioned check to disable this warning.
- # https://lore.kernel.org/lkml/20210824115859.187f272f@canb.auug.org.au
- KBUILD_CFLAGS += $(call cc-ifversion, -ge, 0901, -Wno-alloc-size-larger-than)
- endif
- # disable invalid "can't wrap" optimizations for signed / pointers
- KBUILD_CFLAGS += -fno-strict-overflow
- # Make sure -fstack-check isn't enabled (like gentoo apparently did)
- KBUILD_CFLAGS += -fno-stack-check
- # conserve stack if available
- ifdef CONFIG_CC_IS_GCC
- KBUILD_CFLAGS += -fconserve-stack
- endif
- # Prohibit date/time macros, which would make the build non-deterministic
- KBUILD_CFLAGS += -Werror=date-time
- # enforce correct pointer usage
- KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types)
- # Require designated initializers for all marked structures
- KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init)
- # change __FILE__ to the relative path from the srctree
- KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
- # include additional Makefiles when needed
- include-y := scripts/Makefile.extrawarn
- include-$(CONFIG_DEBUG_INFO) += scripts/Makefile.debug
- include-$(CONFIG_KASAN) += scripts/Makefile.kasan
- include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan
- include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan
- include-$(CONFIG_KCOV) += scripts/Makefile.kcov
- include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins
- include $(addprefix $(srctree)/, $(include-y))
- # scripts/Makefile.gcc-plugins is intentionally included last.
- # Do not add $(call cc-option,...) below this line. When you build the kernel
- # from the clean source tree, the GCC plugins do not exist at this point.
- # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
- KBUILD_CPPFLAGS += $(KCPPFLAGS)
- KBUILD_AFLAGS += $(KAFLAGS)
- KBUILD_CFLAGS += $(KCFLAGS)
- KBUILD_LDFLAGS_MODULE += --build-id=sha1
- LDFLAGS_vmlinux += --build-id=sha1
- ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
- LDFLAGS_vmlinux += $(call ld-option, -X,)
- endif
- ifeq ($(CONFIG_RELR),y)
- LDFLAGS_vmlinux += --pack-dyn-relocs=relr --use-android-relr-tags
- endif
- # We never want expected sections to be placed heuristically by the
- # linker. All sections should be explicitly named in the linker script.
- ifdef CONFIG_LD_ORPHAN_WARN
- LDFLAGS_vmlinux += --orphan-handling=warn
- endif
- # Align the bit size of userspace programs with the kernel
- KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
- KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
- # make the checker run with the right architecture
- CHECKFLAGS += --arch=$(ARCH)
- # insure the checker run with the right endianness
- CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
- # the checker needs the correct machine size
- CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
- # Default kernel image to build when no specific target is given.
- # KBUILD_IMAGE may be overruled on the command line or
- # set in the environment
- # Also any assignments in arch/$(ARCH)/Makefile take precedence over
- # this default value
- export KBUILD_IMAGE ?= vmlinux
- #
- # INSTALL_PATH specifies where to place the updated kernel and system map
- # images. Default is /boot, but you can set it to other values
- export INSTALL_PATH ?= /boot
- #
- # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
- # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
- # an argument if needed. Otherwise it defaults to the kernel install path
- #
- export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
- #
- # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
- # relocations required by build roots. This is not defined in the
- # makefile but the argument can be passed to make if needed.
- #
- MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
- export MODLIB
- PHONY += prepare0
- export extmod_prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)
- export MODORDER := $(extmod_prefix)modules.order
- export MODULES_NSDEPS := $(extmod_prefix)modules.nsdeps
- ifeq ($(KBUILD_EXTMOD),)
- core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/
- core-$(CONFIG_BLOCK) += block/
- vmlinux-dirs := $(patsubst %/,%,$(filter %/, \
- $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
- $(libs-y) $(libs-m)))
- vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \
- $(patsubst %/,%,$(filter %/, $(core-) \
- $(drivers-) $(libs-))))
- subdir-modorder := $(addsuffix modules.order,$(filter %/, \
- $(core-y) $(core-m) $(libs-y) $(libs-m) \
- $(drivers-y) $(drivers-m)))
- build-dirs := $(vmlinux-dirs)
- clean-dirs := $(vmlinux-alldirs)
- # Externally visible symbols (used by link-vmlinux.sh)
- KBUILD_VMLINUX_OBJS := $(head-y) $(patsubst %/,%/built-in.a, $(core-y))
- KBUILD_VMLINUX_OBJS += $(addsuffix built-in.a, $(filter %/, $(libs-y)))
- ifdef CONFIG_MODULES
- KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y)))
- KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y))
- else
- KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y))
- endif
- KBUILD_VMLINUX_OBJS += $(patsubst %/,%/built-in.a, $(drivers-y))
- export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS
- export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
- # used by scripts/Makefile.package
- export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools)
- vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)
- # Recurse until adjust_autoksyms.sh is satisfied
- PHONY += autoksyms_recursive
- ifdef CONFIG_TRIM_UNUSED_KSYMS
- # For the kernel to actually contain only the needed exported symbols,
- # we have to build modules as well to determine what those symbols are.
- # (this can be evaluated only once include/config/auto.conf has been included)
- KBUILD_MODULES := 1
- autoksyms_recursive: descend modules.order
- $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
- "$(MAKE) -f $(srctree)/Makefile vmlinux"
- endif
- autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
- quiet_cmd_autoksyms_h = GEN $@
- cmd_autoksyms_h = mkdir -p $(dir $@); \
- $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@
- $(autoksyms_h):
- $(call cmd,autoksyms_h)
- ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
- # Final link of vmlinux with optional arch pass after final link
- cmd_link-vmlinux = \
- $(CONFIG_SHELL) $< "$(LD)" "$(KBUILD_LDFLAGS)" "$(LDFLAGS_vmlinux)"; \
- $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
- vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
- +$(call if_changed_dep,link-vmlinux)
- targets := vmlinux
- # The actual objects are generated when descending,
- # make sure no implicit rule kicks in
- $(sort $(vmlinux-deps) $(subdir-modorder)): descend ;
- filechk_kernel.release = \
- echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
- # Store (new) KERNELRELEASE string in include/config/kernel.release
- include/config/kernel.release: FORCE
- $(call filechk,kernel.release)
- # Additional helpers built in scripts/
- # Carefully list dependencies so we do not try to build scripts twice
- # in parallel
- PHONY += scripts
- scripts: scripts_basic scripts_dtc
- $(Q)$(MAKE) $(build)=$(@)
- # Things we need to do before we recursively start building the kernel
- # or the modules are listed in "prepare".
- # A multi level approach is used. prepareN is processed before prepareN-1.
- # archprepare is used in arch Makefiles and when processed asm symlink,
- # version.h and scripts_basic is processed / created.
- PHONY += prepare archprepare
- archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \
- asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \
- include/generated/autoconf.h remove-stale-files
- prepare0: archprepare
- $(Q)$(MAKE) $(build)=scripts/mod
- $(Q)$(MAKE) $(build)=.
- # All the preparing..
- prepare: prepare0
- PHONY += remove-stale-files
- remove-stale-files:
- $(Q)$(srctree)/scripts/remove-stale-files
- # Support for using generic headers in asm-generic
- asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj
- PHONY += asm-generic uapi-asm-generic
- asm-generic: uapi-asm-generic
- $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
- generic=include/asm-generic
- uapi-asm-generic:
- $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
- generic=include/uapi/asm-generic
- # Generate some files
- # ---------------------------------------------------------------------------
- # KERNELRELEASE can change from a few different places, meaning version.h
- # needs to be updated, so this check is forced on all builds
- uts_len := 64
- define filechk_utsrelease.h
- if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
- echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
- exit 1; \
- fi; \
- echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
- endef
- define filechk_version.h
- if [ $(SUBLEVEL) -gt 255 ]; then \
- echo \#define LINUX_VERSION_CODE $(shell \
- expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \
- else \
- echo \#define LINUX_VERSION_CODE $(shell \
- expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \
- fi; \
- echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \
- ((c) > 255 ? 255 : (c)))'; \
- echo \#define LINUX_VERSION_MAJOR $(VERSION); \
- echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \
- echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL)
- endef
- $(version_h): PATCHLEVEL := $(if $(PATCHLEVEL), $(PATCHLEVEL), 0)
- $(version_h): SUBLEVEL := $(if $(SUBLEVEL), $(SUBLEVEL), 0)
- $(version_h): FORCE
- $(call filechk,version.h)
- include/generated/utsrelease.h: include/config/kernel.release FORCE
- $(call filechk,utsrelease.h)
- PHONY += headerdep
- headerdep:
- $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
- $(srctree)/scripts/headerdep.pl -I$(srctree)/include
- # ---------------------------------------------------------------------------
- # Kernel headers
- #Default location for installed headers
- export INSTALL_HDR_PATH = $(objtree)/usr
- quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include
- cmd_headers_install = \
- mkdir -p $(INSTALL_HDR_PATH); \
- rsync -mrl --include='*/' --include='*\.h' --exclude='*' \
- usr/include $(INSTALL_HDR_PATH)
- PHONY += headers_install
- headers_install: headers
- $(call cmd,headers_install)
- PHONY += archheaders archscripts
- hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
- PHONY += headers
- headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
- $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
- $(error Headers not exportable for the $(SRCARCH) architecture))
- $(Q)$(MAKE) $(hdr-inst)=include/uapi
- $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
- ifdef CONFIG_HEADERS_INSTALL
- prepare: headers
- endif
- PHONY += scripts_unifdef
- scripts_unifdef: scripts_basic
- $(Q)$(MAKE) $(build)=scripts scripts/unifdef
- # ---------------------------------------------------------------------------
- # Install
- # Many distributions have the custom install script, /sbin/installkernel.
- # If DKMS is installed, 'make install' will eventually recuses back
- # to the this Makefile to build and install external modules.
- # Cancel sub_make_done so that options such as M=, V=, etc. are parsed.
- install: sub_make_done :=
- # ---------------------------------------------------------------------------
- # Tools
- ifdef CONFIG_STACK_VALIDATION
- prepare: tools/objtool
- endif
- ifdef CONFIG_BPF
- ifdef CONFIG_DEBUG_INFO_BTF
- prepare: tools/bpf/resolve_btfids
- endif
- endif
- PHONY += resolve_btfids_clean
- resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids
- # tools/bpf/resolve_btfids directory might not exist
- # in output directory, skip its clean in that case
- resolve_btfids_clean:
- ifneq ($(wildcard $(resolve_btfids_O)),)
- $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean
- endif
- # Clear a bunch of variables before executing the submake
- ifeq ($(quiet),silent_)
- tools_silent=s
- endif
- tools/: FORCE
- $(Q)mkdir -p $(objtree)/tools
- $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
- tools/%: FORCE
- $(Q)mkdir -p $(objtree)/tools
- $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
- # ---------------------------------------------------------------------------
- # Kernel selftest
- PHONY += kselftest
- kselftest:
- $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
- kselftest-%: FORCE
- $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $*
- PHONY += kselftest-merge
- kselftest-merge:
- $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
- $(Q)find $(srctree)/tools/testing/selftests -name config | \
- xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config
- $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
- # ---------------------------------------------------------------------------
- # Devicetree files
- ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
- dtstree := arch/$(SRCARCH)/boot/dts
- endif
- ifneq ($(dtstree),)
- %.dtb: include/config/kernel.release scripts_dtc
- $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
- %.dtbo: include/config/kernel.release scripts_dtc
- $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
- PHONY += dtbs dtbs_install dtbs_check
- dtbs: include/config/kernel.release scripts_dtc
- $(Q)$(MAKE) $(build)=$(dtstree)
- ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),)
- export CHECK_DTBS=y
- dtbs: dt_binding_check
- endif
- dtbs_check: dtbs
- dtbs_install:
- $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH)
- ifdef CONFIG_OF_EARLY_FLATTREE
- all: dtbs
- endif
- endif
- PHONY += scripts_dtc
- scripts_dtc: scripts_basic
- $(Q)$(MAKE) $(build)=scripts/dtc
- ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),)
- export CHECK_DT_BINDING=y
- endif
- PHONY += dt_binding_check
- dt_binding_check: scripts_dtc
- $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
- # ---------------------------------------------------------------------------
- # Modules
- ifdef CONFIG_MODULES
- # By default, build modules as well
- all: modules
- # When we're building modules with modversions, we need to consider
- # the built-in objects during the descend as well, in order to
- # make sure the checksums are up to date before we record them.
- ifdef CONFIG_MODVERSIONS
- KBUILD_BUILTIN := 1
- endif
- # Build modules
- #
- # A module can be listed more than once in obj-m resulting in
- # duplicate lines in modules.order files. Those are removed
- # using awk while concatenating to the final file.
- PHONY += modules
- modules: $(if $(KBUILD_BUILTIN),vmlinux) modules_check modules_prepare
- cmd_modules_order = $(AWK) '!x[$$0]++' $(real-prereqs) > $@
- modules.order: $(subdir-modorder) FORCE
- $(call if_changed,modules_order)
- targets += modules.order
- # Target to prepare building external modules
- PHONY += modules_prepare
- modules_prepare: prepare
- $(Q)$(MAKE) $(build)=scripts scripts/module.lds
- export modules_sign_only :=
- ifeq ($(CONFIG_MODULE_SIG),y)
- PHONY += modules_sign
- modules_sign: modules_install
- @:
- # modules_sign is a subset of modules_install.
- # 'make modules_install modules_sign' is equivalent to 'make modules_install'.
- ifeq ($(filter modules_install,$(MAKECMDGOALS)),)
- modules_sign_only := y
- endif
- endif
- modinst_pre :=
- ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
- modinst_pre := __modinst_pre
- endif
- modules_install: $(modinst_pre)
- PHONY += __modinst_pre
- __modinst_pre:
- @rm -rf $(MODLIB)/kernel
- @rm -f $(MODLIB)/source
- @mkdir -p $(MODLIB)/kernel
- @ln -s $(abspath $(srctree)) $(MODLIB)/source
- @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
- rm -f $(MODLIB)/build ; \
- ln -s $(CURDIR) $(MODLIB)/build ; \
- fi
- @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order
- @cp -f modules.builtin $(MODLIB)/
- @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
- endif # CONFIG_MODULES
- ###
- # Cleaning is done on three levels.
- # make clean Delete most generated files
- # Leave enough to build external modules
- # make mrproper Delete the current configuration, and all generated files
- # make distclean Remove editor backup files, patch leftover files and the like
- # Directories & files removed with 'make clean'
- CLEAN_FILES += include/ksym vmlinux.symvers modules-only.symvers \
- modules.builtin modules.builtin.modinfo modules.nsdeps \
- compile_commands.json .thinlto-cache
- # Directories & files removed with 'make mrproper'
- MRPROPER_FILES += include/config include/generated \
- arch/$(SRCARCH)/include/generated .tmp_objdiff \
- debian snap tar-install \
- .config .config.old .version \
- Module.symvers \
- certs/signing_key.pem \
- certs/x509.genkey \
- vmlinux-gdb.py \
- *.spec
- # clean - Delete most, but leave enough to build external modules
- #
- clean: rm-files := $(CLEAN_FILES)
- PHONY += archclean vmlinuxclean
- vmlinuxclean:
- $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
- $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
- clean: archclean vmlinuxclean resolve_btfids_clean
- # mrproper - Delete all generated files, including .config
- #
- mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
- mrproper-dirs := $(addprefix _mrproper_,scripts)
- PHONY += $(mrproper-dirs) mrproper
- $(mrproper-dirs):
- $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
- mrproper: clean $(mrproper-dirs)
- $(call cmd,rmfiles)
- # distclean
- #
- PHONY += distclean
- distclean: mrproper
- @find . $(RCS_FIND_IGNORE) \
- \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
- -o -name '*.bak' -o -name '#*#' -o -name '*%' \
- -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \
- -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \
- -type f -print | xargs rm -f
- # Packaging of the kernel to various formats
- # ---------------------------------------------------------------------------
- %src-pkg: FORCE
- $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
- %pkg: include/config/kernel.release FORCE
- $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
- # Brief documentation of the typical targets used
- # ---------------------------------------------------------------------------
- boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
- boards := $(sort $(notdir $(boards)))
- board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
- board-dirs := $(sort $(notdir $(board-dirs:/=)))
- PHONY += help
- help:
- @echo 'Cleaning targets:'
- @echo ' clean - Remove most generated files but keep the config and'
- @echo ' enough build support to build external modules'
- @echo ' mrproper - Remove all generated files + config + various backup files'
- @echo ' distclean - mrproper + remove editor backup and patch files'
- @echo ''
- @echo 'Configuration targets:'
- @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
- @echo ''
- @echo 'Other generic targets:'
- @echo ' all - Build all targets marked with [*]'
- @echo '* vmlinux - Build the bare kernel'
- @echo '* modules - Build all modules'
- @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
- @echo ' dir/ - Build all files in dir and below'
- @echo ' dir/file.[ois] - Build specified target only'
- @echo ' dir/file.ll - Build the LLVM assembly file'
- @echo ' (requires compiler support for LLVM assembly generation)'
- @echo ' dir/file.lst - Build specified mixed source/assembly target only'
- @echo ' (requires a recent binutils and recent build (System.map))'
- @echo ' dir/file.ko - Build module including final link'
- @echo ' modules_prepare - Set up for building external modules'
- @echo ' tags/TAGS - Generate tags file for editors'
- @echo ' cscope - Generate cscope index'
- @echo ' gtags - Generate GNU GLOBAL index'
- @echo ' kernelrelease - Output the release version string (use with make -s)'
- @echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
- @echo ' image_name - Output the image name (use with make -s)'
- @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
- echo ' (default: $(INSTALL_HDR_PATH))'; \
- echo ''
- @echo 'Static analysers:'
- @echo ' checkstack - Generate a list of stack hogs'
- @echo ' versioncheck - Sanity check on version.h usage'
- @echo ' includecheck - Check for duplicate included header files'
- @echo ' export_report - List the usages of all exported symbols'
- @echo ' headerdep - Detect inclusion cycles in headers'
- @echo ' coccicheck - Check with Coccinelle'
- @echo ' clang-analyzer - Check with clang static analyzer'
- @echo ' clang-tidy - Check with clang-tidy'
- @echo ''
- @echo 'Tools:'
- @echo ' nsdeps - Generate missing symbol namespace dependencies'
- @echo ''
- @echo 'Kernel selftest:'
- @echo ' kselftest - Build and run kernel selftest'
- @echo ' Build, install, and boot kernel before'
- @echo ' running kselftest on it'
- @echo ' Run as root for full coverage'
- @echo ' kselftest-all - Build kernel selftest'
- @echo ' kselftest-install - Build and install kernel selftest'
- @echo ' kselftest-clean - Remove all generated kselftest files'
- @echo ' kselftest-merge - Merge all the config dependencies of'
- @echo ' kselftest to existing .config.'
- @echo ''
- @$(if $(dtstree), \
- echo 'Devicetree:'; \
- echo '* dtbs - Build device tree blobs for enabled boards'; \
- echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \
- echo ' dt_binding_check - Validate device tree binding documents'; \
- echo ' dtbs_check - Validate device tree source files';\
- echo '')
- @echo 'Userspace tools targets:'
- @echo ' use "make tools/help"'
- @echo ' or "cd tools; make help"'
- @echo ''
- @echo 'Kernel packaging:'
- @$(MAKE) -f $(srctree)/scripts/Makefile.package help
- @echo ''
- @echo 'Documentation targets:'
- @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
- @echo ''
- @echo 'Architecture specific targets ($(SRCARCH)):'
- @$(if $(archhelp),$(archhelp),\
- echo ' No architecture specific help defined for $(SRCARCH)')
- @echo ''
- @$(if $(boards), \
- $(foreach b, $(boards), \
- printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
- echo '')
- @$(if $(board-dirs), \
- $(foreach b, $(board-dirs), \
- printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
- printf " %-16s - Show all of the above\\n" help-boards; \
- echo '')
- @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
- @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
- @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
- @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK'
- @echo ' (sparse by default)'
- @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
- @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
- @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where'
- @echo ' 1: warnings which may be relevant and do not occur too often'
- @echo ' 2: warnings which occur quite often but may still be relevant'
- @echo ' 3: more obscure warnings, can most likely be ignored'
- @echo ' Multiple levels can be combined with W=12 or W=123'
- @echo ''
- @echo 'Execute "make" or "make all" to build all targets marked with [*] '
- @echo 'For further info see the ./README file'
- help-board-dirs := $(addprefix help-,$(board-dirs))
- help-boards: $(help-board-dirs)
- boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
- $(help-board-dirs): help-%:
- @echo 'Architecture specific targets ($(SRCARCH) $*):'
- @$(if $(boards-per-dir), \
- $(foreach b, $(boards-per-dir), \
- printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
- echo '')
- # Documentation targets
- # ---------------------------------------------------------------------------
- DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
- linkcheckdocs dochelp refcheckdocs
- PHONY += $(DOC_TARGETS)
- $(DOC_TARGETS):
- $(Q)$(MAKE) $(build)=Documentation $@
- # Misc
- # ---------------------------------------------------------------------------
- PHONY += scripts_gdb
- scripts_gdb: prepare0
- $(Q)$(MAKE) $(build)=scripts/gdb
- $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
- ifdef CONFIG_GDB_SCRIPTS
- all: scripts_gdb
- endif
- else # KBUILD_EXTMOD
- ###
- # External module support.
- # When building external modules the kernel used as basis is considered
- # read-only, and no consistency checks are made and the make
- # system is not used on the basis kernel. If updates are required
- # in the basis kernel ordinary make commands (without M=...) must be used.
- # We are always building only modules.
- KBUILD_BUILTIN :=
- KBUILD_MODULES := 1
- build-dirs := $(KBUILD_EXTMOD)
- $(MODORDER): descend
- @:
- compile_commands.json: $(extmod_prefix)compile_commands.json
- PHONY += compile_commands.json
- clean-dirs := $(KBUILD_EXTMOD)
- clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \
- $(KBUILD_EXTMOD)/compile_commands.json $(KBUILD_EXTMOD)/.thinlto-cache
- PHONY += prepare
- # now expand this into a simple variable to reduce the cost of shell evaluations
- prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT)
- prepare:
- @if [ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \
- echo >&2 "warning: the compiler differs from the one used to build the kernel"; \
- echo >&2 " The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \
- echo >&2 " You are using: $(CC_VERSION_TEXT)"; \
- fi
- PHONY += help
- help:
- @echo ' Building external modules.'
- @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
- @echo ''
- @echo ' modules - default target, build the module(s)'
- @echo ' modules_install - install the module'
- @echo ' clean - remove generated files in module directory only'
- @echo ''
- # no-op for external module builds
- PHONY += modules_prepare
- endif # KBUILD_EXTMOD
- # ---------------------------------------------------------------------------
- # Modules
- PHONY += modules modules_install
- ifdef CONFIG_MODULES
- modules: modules_check
- $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
- PHONY += modules_check
- modules_check: $(MODORDER)
- $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $<
- quiet_cmd_depmod = DEPMOD $(MODLIB)
- cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
- $(KERNELRELEASE)
- modules_install:
- $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
- $(call cmd,depmod)
- else # CONFIG_MODULES
- # Modules not configured
- # ---------------------------------------------------------------------------
- modules modules_install:
- @echo >&2 '***'
- @echo >&2 '*** The present kernel configuration has modules disabled.'
- @echo >&2 '*** To use the module feature, please run "make menuconfig" etc.'
- @echo >&2 '*** to enable CONFIG_MODULES.'
- @echo >&2 '***'
- @exit 1
- endif # CONFIG_MODULES
- # Single targets
- # ---------------------------------------------------------------------------
- # To build individual files in subdirectories, you can do like this:
- #
- # make foo/bar/baz.s
- #
- # The supported suffixes for single-target are listed in 'single-targets'
- #
- # To build only under specific subdirectories, you can do like this:
- #
- # make foo/bar/baz/
- ifdef single-build
- # .ko is special because modpost is needed
- single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS)))
- single-no-ko := $(sort $(patsubst %.ko,%.mod, $(MAKECMDGOALS)))
- $(single-ko): single_modpost
- @:
- $(single-no-ko): descend
- @:
- ifeq ($(KBUILD_EXTMOD),)
- # For the single build of in-tree modules, use a temporary file to avoid
- # the situation of modules_install installing an invalid modules.order.
- MODORDER := .modules.tmp
- endif
- PHONY += single_modpost
- single_modpost: $(single-no-ko) modules_prepare
- $(Q){ $(foreach m, $(single-ko), echo $(extmod_prefix)$m;) } > $(MODORDER)
- $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
- KBUILD_MODULES := 1
- export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod_prefix), $(single-no-ko))
- # trim unrelated directories
- build-dirs := $(foreach d, $(build-dirs), \
- $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d)))
- endif
- ifndef CONFIG_MODULES
- KBUILD_MODULES :=
- endif
- # Handle descending into subdirectories listed in $(build-dirs)
- # Preset locale variables to speed up the build process. Limit locale
- # tweaks to this spot to avoid wrong language settings when running
- # make menuconfig etc.
- # Error messages still appears in the original language
- PHONY += descend $(build-dirs)
- descend: $(build-dirs)
- $(build-dirs): prepare
- $(Q)$(MAKE) $(build)=$@ \
- single-build=$(if $(filter-out $@/, $(filter $@/%, $(KBUILD_SINGLE_TARGETS))),1) \
- need-builtin=1 need-modorder=1
- clean-dirs := $(addprefix _clean_, $(clean-dirs))
- PHONY += $(clean-dirs) clean
- $(clean-dirs):
- $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
- clean: $(clean-dirs)
- $(call cmd,rmfiles)
- @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
- \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
- -o -name '*.ko.*' \
- -o -name '*.dtb' -o -name '*.dtbo' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
- -o -name '*.dwo' -o -name '*.lst' \
- -o -name '*.su' -o -name '*.mod' \
- -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
- -o -name '*.lex.c' -o -name '*.tab.[ch]' \
- -o -name '*.asn1.[ch]' \
- -o -name '*.symtypes' -o -name 'modules.order' \
- -o -name '.tmp_*.o.*' \
- -o -name '*.c.[012]*.*' \
- -o -name '*.ll' \
- -o -name '*.gcno' \
- -o -name '*.*.symversions' \) -type f -print | xargs rm -f
- # Generate tags for editors
- # ---------------------------------------------------------------------------
- quiet_cmd_tags = GEN $@
- cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@
- tags TAGS cscope gtags: FORCE
- $(call cmd,tags)
- # Script to generate missing namespace dependencies
- # ---------------------------------------------------------------------------
- PHONY += nsdeps
- nsdeps: export KBUILD_NSDEPS=1
- nsdeps: modules
- $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps
- # Clang Tooling
- # ---------------------------------------------------------------------------
- quiet_cmd_gen_compile_commands = GEN $@
- cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs))
- $(extmod_prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \
- $(if $(KBUILD_EXTMOD),,$(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)) \
- $(if $(CONFIG_MODULES), $(MODORDER)) FORCE
- $(call if_changed,gen_compile_commands)
- targets += $(extmod_prefix)compile_commands.json
- PHONY += clang-tidy clang-analyzer
- ifdef CONFIG_CC_IS_CLANG
- quiet_cmd_clang_tools = CHECK $<
- cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $<
- clang-tidy clang-analyzer: $(extmod_prefix)compile_commands.json
- $(call cmd,clang_tools)
- else
- clang-tidy clang-analyzer:
- @echo "$@ requires CC=clang" >&2
- @false
- endif
- # Scripts to check various things for consistency
- # ---------------------------------------------------------------------------
- PHONY += includecheck versioncheck coccicheck export_report
- includecheck:
- find $(srctree)/* $(RCS_FIND_IGNORE) \
- -name '*.[hcS]' -type f -print | sort \
- | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
- versioncheck:
- find $(srctree)/* $(RCS_FIND_IGNORE) \
- -name '*.[hcS]' -type f -print | sort \
- | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
- coccicheck:
- $(Q)$(BASH) $(srctree)/scripts/$@
- export_report:
- $(PERL) $(srctree)/scripts/export_report.pl
- PHONY += checkstack kernelrelease kernelversion image_name
- # UML needs a little special treatment here. It wants to use the host
- # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
- # else wants $(ARCH), including people doing cross-builds, which means
- # that $(SUBARCH) doesn't work here.
- ifeq ($(ARCH), um)
- CHECKSTACK_ARCH := $(SUBARCH)
- else
- CHECKSTACK_ARCH := $(ARCH)
- endif
- checkstack:
- $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
- $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
- kernelrelease:
- @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
- kernelversion:
- @echo $(KERNELVERSION)
- image_name:
- @echo $(KBUILD_IMAGE)
- quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
- cmd_rmfiles = rm -rf $(rm-files)
- # read saved command lines for existing targets
- existing-targets := $(wildcard $(sort $(targets)))
- -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
- endif # config-build
- endif # mixed-build
- endif # need-sub-make
- PHONY += FORCE
- FORCE:
- # Declare the contents of the PHONY variable as phony. We keep that
- # information in a variable so we can use it in if_changed and friends.
- .PHONY: $(PHONY)
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