Config.in - github/buildroot/buildroot - Gitiles

 #

 mainmenu "Buildroot $BR2_VERSION Configuration"

 config BR2_HAVE_DOT_CONFIG
 	bool
 	default y

 config BR2_VERSION
 	string
 	option env="BR2_VERSION_FULL"

 config BR2_HOSTARCH
 	string
 	option env="HOSTARCH"

 # Hidden boolean selected by pre-built packages for x86, when they
 # need to run on x86-64 machines (example: pre-built external
 # toolchains, binary tools like SAM-BA, etc.).
 config BR2_HOSTARCH_NEEDS_IA32_LIBS
 	bool

 source "arch/Config.in"

 menu "Build options"

 menu "Commands"

 config BR2_WGET
 	string "Wget command"
 	default "wget --passive-ftp -nd -t 3"

 config BR2_SVN
 	string "Subversion (svn) command"
 	default "svn"

 config BR2_BZR
 	string "Bazaar (bzr) command"
 	default "bzr"

 config BR2_GIT
 	string "Git command"
 	default "git"

 config BR2_LOCALFILES
 	string "Local files retrieval command"
 	default "cp"

 config BR2_SCP
 	string "Secure copy (scp) command"
 	default "scp"

 config BR2_SSH
 	string "Secure shell (ssh) command"
 	default "ssh"

 config BR2_HG
 	string "Mercurial (hg) command"
 	default "hg"

 config BR2_ZCAT
 	string "zcat command"
 	default "gzip -d -c"
 	help
 	  Command to be used to extract a gzip'ed file to stdout.
 	  zcat is identical to gunzip -c except that the former may
 	  not be available on your system.
 	  Default is "gzip -d -c"
 	  Other possible values include "gunzip -c" or "zcat".

 config BR2_BZCAT
 	string "bzcat command"
 	default "bzcat"
 	help
 	  Command to be used to extract a bzip2'ed file to stdout.
 	  bzcat is identical to bunzip2 -c except that the former may
 	  not be available on your system.
 	  Default is "bzcat"
 	  Other possible values include "bunzip2 -c" or "bzip2 -d -c".

 config BR2_XZCAT
 	string "xzcat command"
 	default "xzcat"
 	help
 	  Command to be used to extract a xz'ed file to stdout.
 	  Default is "xzcat"

 config BR2_TAR_OPTIONS
 	string "Tar options"
 	default ""
 	help
 	  Options to pass to tar when extracting the sources.
 	  E.g. " -v --exclude='*.svn*'" to exclude all .svn internal files
 	  and to be verbose.

 endmenu

 config BR2_DEFCONFIG_FROM_ENV
 	string
 	option env="BR2_DEFCONFIG"

 config BR2_DEFCONFIG
 	string "Location to save buildroot config"
 	default BR2_DEFCONFIG_FROM_ENV if BR2_DEFCONFIG_FROM_ENV != ""
 	default "$(CONFIG_DIR)/defconfig"
 	help
 	  When running 'make savedefconfig', the defconfig file will be saved
 	  in this location.

 config BR2_DL_DIR
 	string "Download dir"
 	default "$(TOPDIR)/dl"
 	help
 	  Directory to store all the source files that we need to fetch.
 	  If the Linux shell environment has defined the BUILDROOT_DL_DIR
 	  environment variable, then this overrides this configuration item.

 	  The default is $(TOPDIR)/dl

 config BR2_HOST_DIR
 	string "Host dir"
 	default "$(BASE_DIR)/host"
 	help
 	  Directory to store all the binary files that are built for the host.
 	  This includes the cross compilation toolchain when building the
 	  internal buildroot toolchain.

 	  The default is $(BASE_DIR)/host

 menu "Mirrors and Download locations"

 config BR2_PRIMARY_SITE
 	string "Primary download site"
 	default ""
 	help
 	  Primary site to download from. If this option is set then buildroot
 	  will try to download package source first from this site and try the
 	  default if the file is not found.
 	  Valid URIs are URIs recognized by $(WGET) and scp URIs of the form
 	  scp://[user@]host:path.
 	  NOTE: This works for all packages using the central package
 	  infrastructure (generic, autotools, cmake, ...)

 config BR2_PRIMARY_SITE_ONLY
 	bool "Only allow downloads from primary download site"
 	depends on BR2_PRIMARY_SITE != ""
 	help
 	  If this option is enabled, downloads will only be attempted
 	  from the primary download site. Other locations, like the
 	  package's official download location or the backup download
 	  site, will not be considered. Therefore, if the package is
 	  not present on the primary site, the download fails.

 	  This is useful for project developers who want to ensure
 	  that the project can be built even if the upstream tarball
 	  locations disappear.

 if !BR2_PRIMARY_SITE_ONLY

 config BR2_BACKUP_SITE
 	string "Backup download site"
 	default "http://sources.buildroot.net/"
 	help
 	  Backup site to download from. If this option is set then buildroot
 	  will fall back to download package sources from here if the
 	  normal location fails.

 config BR2_KERNEL_MIRROR
 	string "Kernel.org mirror"
 	default "http://www.kernel.org/pub/"
 	help
 	  kernel.org is mirrored on a number of servers around the world.
 	  The following allows you to select your preferred mirror.

 	  Have a look on the kernel.org site for a list of mirrors, then enter
 	  the URL to the base directory.  Examples:

 	     http://www.XX.kernel.org/pub (XX = country code)
 	     http://mirror.aarnet.edu.au/pub/ftp.kernel.org

 config BR2_GNU_MIRROR
 	string "GNU Software mirror"
 	default "http://ftp.gnu.org/pub/gnu"
 	help
 	  GNU has multiple software mirrors scattered around the world.
 	  The following allows you to select your preferred mirror.

 	  Have a look on the gnu.org site for a list of mirrors, then enter
 	  the URL to the base directory.  Examples:

 	     http://ftp.gnu.org/pub/gnu
 	     http://mirror.aarnet.edu.au/pub/gnu

 config BR2_DEBIAN_MIRROR
 	string "Debian Software mirror"
 	default "http://ftp.debian.org"
 	help
 	  Debian has multiple software mirrors scattered around the world.
 	  The following allows you to select your preferred mirror.

 	  Usually, just add your country code like XX here:
 	  http://ftp.XX.debian.org

 endif

 endmenu

 config BR2_JLEVEL
 	int "Number of jobs to run simultaneously (0 for auto)"
 	default "0"
 	help
 	  Number of jobs to run simultaneously.  If 0, determine
 	  automatically according to number of CPUs on the host
 	  system.

 config BR2_CCACHE
 	bool "Enable compiler cache"
 	help
 	  This option will enable the use of ccache, a compiler
 	  cache. It will cache the result of previous builds to speed
 	  up future builds. The cache is stored in
 	  $HOME/.buildroot-ccache.

 	  Note that Buildroot does not try to invalidate the cache
 	  contents when the compiler changes in an incompatible
 	  way. Therefore, if you make a change to the compiler version
 	  and/or configuration, you are responsible for purging the
 	  ccache cache by removing the $HOME/.buildroot-ccache
 	  directory.

 config BR2_CCACHE_DIR
 	string "Compiler cache location"
 	depends on BR2_CCACHE
 	default "$(HOME)/.buildroot-ccache"
 	help
 	  Where ccache should store cached files.

 config BR2_DEPRECATED
 	bool "Show packages that are deprecated or obsolete"
 	help
 	  This option hides outdated/obsolete versions of packages.

 config BR2_ENABLE_DEBUG
 	bool "build packages with debugging symbols"
 	help
 	  Build packages with debugging symbols enabled. All libraries
 	  and binaries in the 'staging' directory will have debugging
 	  symbols, which allows remote debugging even if libraries and
 	  binaries are stripped on the target. Whether libraries and
 	  binaries are stripped on the target is controlled by the
 	  BR2_STRIP_* options below.

 if BR2_ENABLE_DEBUG
 choice
 	prompt "gcc debug level"
 	default BR2_DEBUG_2
 	help
 	  Set the debug level for gcc

 config BR2_DEBUG_1
 	bool "debug level 1"
 	help
 	  Debug level 1 produces minimal information, enough
 	  for making backtraces in parts of the program that
 	  you don't plan to debug. This includes descriptions
 	  of functions and external variables, but no information
 	  about local variables and no line numbers.

 config BR2_DEBUG_2
 	bool "debug level 2"
 	help
 	  The default gcc debug level is 2

 config BR2_DEBUG_3
 	bool "debug level 3"
 	help
 	  Level 3 includes extra information, such as all the
 	  macro definitions present in the program. Some debuggers
 	  support macro expansion when you use -g3.
 endchoice
 endif

 choice
 	prompt "strip command for binaries on target"
 	default BR2_STRIP_strip

 config BR2_STRIP_strip
 	bool "strip"
 	depends on !BR2_ELF2FLT
 	help
 	  Binaries and libraries in the target filesystem will be
 	  stripped using the normal 'strip' command. This allows to
 	  save space, mainly by removing debugging symbols. Debugging
 	  symbols on the target are needed for native debugging, but
 	  not when remote debugging is used.

 config BR2_STRIP_sstrip
 	bool "sstrip"
 	select BR2_PACKAGE_SSTRIP_HOST
 	depends on !BR2_ELF2FLT
 	help
 	  Binaries and libraries in the target filesystem will be
 	  stripped using the 'sstrip' command, which strips a little
 	  bit more than the traditional 'strip' command. This allows to
 	  save space, mainly by removing debugging symbols. Debugging
 	  symbols on the target are needed for native debugging, but
 	  not when remote debugging is used.

 config BR2_STRIP_none
 	bool "none"
 	help
 	  Do not strip binaries and libraries in the target
 	  filesystem.
 endchoice

 config BR2_STRIP_EXCLUDE_FILES
 	string "executables that should not be stripped"
 	depends on !BR2_STRIP_none
 	default ""
 	help
 	  You may specify a space-separated list of binaries and libraries
 	  here that should not be stripped on the target.

 config BR2_STRIP_EXCLUDE_DIRS
 	string "directories that should be skipped when stripping"
 	depends on !BR2_STRIP_none
 	default ""
 	help
 	  You may specify a space-separated list of directories that should
 	  be skipped when stripping. Binaries and libraries in these
 	  directories will not be touched.
 	  The directories should be specified relative to the target directory,
 	  without leading slash.

 choice
 	prompt "gcc optimization level"
 	default BR2_OPTIMIZE_S
 	help
 	  Set the optimization level for gcc

 config BR2_OPTIMIZE_0
 	bool "optimization level 0"
 	help
 	  Do not optimize. This is the default.

 config BR2_OPTIMIZE_1
 	bool "optimization level 1"
 	help
 	  Optimize. Optimizing compilation takes somewhat more time,
 	  and a lot more memory for a large function. With -O, the
 	  compiler tries to reduce code size and execution time,
 	  without performing any optimizations that take a great deal
 	  of compilation time. -O turns on the following optimization
 	  flags: -fdefer-pop -fdelayed-branch -fguess-branch-probability
 	  -fcprop-registers -floop-optimize -fif-conversion
 	  -fif-conversion2 -ftree-ccp -ftree-dce -ftree-dominator-opts
 	  -ftree-dse -ftree-ter -ftree-lrs -ftree-sra -ftree-copyrename
 	  -ftree-fre -ftree-ch -funit-at-a-time -fmerge-constants
 	  -O also turns on -fomit-frame-pointer on machines where doing
 	  so does not interfere with debugging.

 config BR2_OPTIMIZE_2
 	bool "optimization level 2"
 	help
 	  Optimize even more. GCC performs nearly all supported optimizations
 	  that do not involve a space-speed tradeoff. The compiler does not
 	  perform loop unrolling or function inlining when you specify -O2.
 	  As compared to -O, this option increases both compilation time and
 	  the performance of the generated code. -O2 turns on all optimization
 	  flags specified by -O. It also turns on the following optimization
 	  flags: -fthread-jumps -fcrossjumping -foptimize-sibling-calls
 	  -fcse-follow-jumps -fcse-skip-blocks -fgcse  -fgcse-lm
 	  -fexpensive-optimizations -fstrength-reduce -frerun-cse-after-loop
 	  -frerun-loop-opt -fcaller-saves -fpeephole2 -fschedule-insns
 	  -fschedule-insns2 -fsched-interblock -fsched-spec -fregmove
 	  -fstrict-aliasing -fdelete-null-pointer-checks -freorder-blocks
 	  -freorder-functions -falign-functions -falign-jumps -falign-loops
 	  -falign-labels -ftree-vrp -ftree-pre
 	  Please note the warning under -fgcse about invoking -O2 on programs
 	  that use computed gotos.

 config BR2_OPTIMIZE_3
 	bool "optimization level 3"
 	help
 	  Optimize yet more. -O3 turns on all optimizations specified by -O2
 	  and also turns on the -finline-functions, -funswitch-loops and
 	  -fgcse-after-reload options.

 config BR2_OPTIMIZE_S
 	bool "optimize for size"
 	help
 	  Optimize for size. -Os enables all -O2 optimizations that do not
 	  typically increase code size. It also performs further optimizations
 	  designed to reduce code size. -Os disables the following optimization
 	  flags: -falign-functions -falign-jumps -falign-loops -falign-labels
 	  -freorder-blocks -freorder-blocks-and-partition -fprefetch-loop-arrays
 	  -ftree-vect-loop-version

 endchoice

 config BR2_PREFER_STATIC_LIB
 	bool "prefer static libraries"
 	help
 	  Where possible, build and use static libraries for the target.
 	  This potentially increases your code size and should only be
 	  used if you know what you do.
 	  The default is to build dynamic libraries and use those on
 	  the target filesystem.

 	  WARNING: This is highly experimental at the moment.

 config BR2_HAVE_DOCUMENTATION
 	bool "documentation on the target"
 	# We no longer want to support a toolchain on the target
 	depends on BR2_DEPRECATED
 	help
 	  Install the documentation, including manual pages and info
 	  pages, on the target.
 	  If you say n here, your target will not contain any
 	  documentation.

 config BR2_HAVE_DEVFILES
 	bool "development files in target filesystem"
 	# We no longer want to support a toolchain on the target
 	depends on BR2_DEPRECATED
 	help
 	  Install headers and static libraries in the
 	  target filesystem

 config BR2_PACKAGE_OVERRIDE_FILE
 	string "location of a package override file"
 	default "$(TOPDIR)/local.mk"
 	help
 	  A package override file is a short makefile that contains
 	  variable definitions of the form <pkg>_OVERRIDE_SRCDIR,
 	  which allows to tell Buildroot to use an existing directory
 	  as the source directory for a particular package. See the
 	  Buildroot documentation for more details on this feature.

 endmenu

 source "toolchain/Config.in"

 source "system/Config.in"

 source "package/Config.in"

 source "package/Config.in.host"

 source "fs/Config.in"

 source "boot/Config.in"

 source "linux/Config.in"

 source "Config.in.legacy"
	#

	mainmenu "Buildroot $BR2_VERSION Configuration"

	config BR2_HAVE_DOT_CONFIG
	bool
	default y

	config BR2_VERSION
	string
	option env="BR2_VERSION_FULL"

	config BR2_HOSTARCH
	string
	option env="HOSTARCH"

	# Hidden boolean selected by pre-built packages for x86, when they
	# need to run on x86-64 machines (example: pre-built external
	# toolchains, binary tools like SAM-BA, etc.).
	config BR2_HOSTARCH_NEEDS_IA32_LIBS
	bool

	source "arch/Config.in"

	menu "Build options"

	menu "Commands"

	config BR2_WGET
	string "Wget command"
	default "wget --passive-ftp -nd -t 3"

	config BR2_SVN
	string "Subversion (svn) command"
	default "svn"

	config BR2_BZR
	string "Bazaar (bzr) command"
	default "bzr"

	config BR2_GIT
	string "Git command"
	default "git"

	config BR2_LOCALFILES
	string "Local files retrieval command"
	default "cp"

	config BR2_SCP
	string "Secure copy (scp) command"
	default "scp"

	config BR2_SSH
	string "Secure shell (ssh) command"
	default "ssh"

	config BR2_HG
	string "Mercurial (hg) command"
	default "hg"

	config BR2_ZCAT
	string "zcat command"
	default "gzip -d -c"
	help
	Command to be used to extract a gzip'ed file to stdout.
	zcat is identical to gunzip -c except that the former may
	not be available on your system.
	Default is "gzip -d -c"
	Other possible values include "gunzip -c" or "zcat".

	config BR2_BZCAT
	string "bzcat command"
	default "bzcat"
	help
	Command to be used to extract a bzip2'ed file to stdout.
	bzcat is identical to bunzip2 -c except that the former may
	not be available on your system.
	Default is "bzcat"
	Other possible values include "bunzip2 -c" or "bzip2 -d -c".

	config BR2_XZCAT
	string "xzcat command"
	default "xzcat"
	help
	Command to be used to extract a xz'ed file to stdout.
	Default is "xzcat"

	config BR2_TAR_OPTIONS
	string "Tar options"
	default ""
	help
	Options to pass to tar when extracting the sources.
	E.g. " -v --exclude='.svn'" to exclude all .svn internal files
	and to be verbose.

	endmenu

	config BR2_DEFCONFIG_FROM_ENV
	string
	option env="BR2_DEFCONFIG"

	config BR2_DEFCONFIG
	string "Location to save buildroot config"
	default BR2_DEFCONFIG_FROM_ENV if BR2_DEFCONFIG_FROM_ENV != ""
	default "$(CONFIG_DIR)/defconfig"
	help
	When running 'make savedefconfig', the defconfig file will be saved
	in this location.

	config BR2_DL_DIR
	string "Download dir"
	default "$(TOPDIR)/dl"
	help
	Directory to store all the source files that we need to fetch.
	If the Linux shell environment has defined the BUILDROOT_DL_DIR
	environment variable, then this overrides this configuration item.

	The default is $(TOPDIR)/dl

	config BR2_HOST_DIR
	string "Host dir"
	default "$(BASE_DIR)/host"
	help
	Directory to store all the binary files that are built for the host.
	This includes the cross compilation toolchain when building the
	internal buildroot toolchain.

	The default is $(BASE_DIR)/host

	menu "Mirrors and Download locations"

	config BR2_PRIMARY_SITE
	string "Primary download site"
	default ""
	help
	Primary site to download from. If this option is set then buildroot
	will try to download package source first from this site and try the
	default if the file is not found.
	Valid URIs are URIs recognized by $(WGET) and scp URIs of the form
	scp://[user@]host:path.
	NOTE: This works for all packages using the central package
	infrastructure (generic, autotools, cmake, ...)

	config BR2_PRIMARY_SITE_ONLY
	bool "Only allow downloads from primary download site"
	depends on BR2_PRIMARY_SITE != ""
	help
	If this option is enabled, downloads will only be attempted
	from the primary download site. Other locations, like the
	package's official download location or the backup download
	site, will not be considered. Therefore, if the package is
	not present on the primary site, the download fails.

	This is useful for project developers who want to ensure
	that the project can be built even if the upstream tarball
	locations disappear.

	if !BR2_PRIMARY_SITE_ONLY

	config BR2_BACKUP_SITE
	string "Backup download site"
	default "http://sources.buildroot.net/"
	help
	Backup site to download from. If this option is set then buildroot
	will fall back to download package sources from here if the
	normal location fails.

	config BR2_KERNEL_MIRROR
	string "Kernel.org mirror"
	default "http://www.kernel.org/pub/"
	help
	kernel.org is mirrored on a number of servers around the world.
	The following allows you to select your preferred mirror.

	Have a look on the kernel.org site for a list of mirrors, then enter
	the URL to the base directory. Examples:

	http://www.XX.kernel.org/pub (XX = country code)
	http://mirror.aarnet.edu.au/pub/ftp.kernel.org

	config BR2_GNU_MIRROR
	string "GNU Software mirror"
	default "http://ftp.gnu.org/pub/gnu"
	help
	GNU has multiple software mirrors scattered around the world.
	The following allows you to select your preferred mirror.

	Have a look on the gnu.org site for a list of mirrors, then enter
	the URL to the base directory. Examples:

	http://ftp.gnu.org/pub/gnu
	http://mirror.aarnet.edu.au/pub/gnu

	config BR2_DEBIAN_MIRROR
	string "Debian Software mirror"
	default "http://ftp.debian.org"
	help
	Debian has multiple software mirrors scattered around the world.
	The following allows you to select your preferred mirror.

	Usually, just add your country code like XX here:
	http://ftp.XX.debian.org

	endif

	endmenu

	config BR2_JLEVEL
	int "Number of jobs to run simultaneously (0 for auto)"
	default "0"
	help
	Number of jobs to run simultaneously. If 0, determine
	automatically according to number of CPUs on the host
	system.

	config BR2_CCACHE
	bool "Enable compiler cache"
	help
	This option will enable the use of ccache, a compiler
	cache. It will cache the result of previous builds to speed
	up future builds. The cache is stored in
	$HOME/.buildroot-ccache.

	Note that Buildroot does not try to invalidate the cache
	contents when the compiler changes in an incompatible
	way. Therefore, if you make a change to the compiler version
	and/or configuration, you are responsible for purging the
	ccache cache by removing the $HOME/.buildroot-ccache
	directory.

	config BR2_CCACHE_DIR
	string "Compiler cache location"
	depends on BR2_CCACHE
	default "$(HOME)/.buildroot-ccache"
	help
	Where ccache should store cached files.

	config BR2_DEPRECATED
	bool "Show packages that are deprecated or obsolete"
	help
	This option hides outdated/obsolete versions of packages.

	config BR2_ENABLE_DEBUG
	bool "build packages with debugging symbols"
	help
	Build packages with debugging symbols enabled. All libraries
	and binaries in the 'staging' directory will have debugging
	symbols, which allows remote debugging even if libraries and
	binaries are stripped on the target. Whether libraries and
	binaries are stripped on the target is controlled by the
	BR2_STRIP_* options below.

	if BR2_ENABLE_DEBUG
	choice
	prompt "gcc debug level"
	default BR2_DEBUG_2
	help
	Set the debug level for gcc

	config BR2_DEBUG_1
	bool "debug level 1"
	help
	Debug level 1 produces minimal information, enough
	for making backtraces in parts of the program that
	you don't plan to debug. This includes descriptions
	of functions and external variables, but no information
	about local variables and no line numbers.

	config BR2_DEBUG_2
	bool "debug level 2"
	help
	The default gcc debug level is 2

	config BR2_DEBUG_3
	bool "debug level 3"
	help
	Level 3 includes extra information, such as all the
	macro definitions present in the program. Some debuggers
	support macro expansion when you use -g3.
	endchoice
	endif

	choice
	prompt "strip command for binaries on target"
	default BR2_STRIP_strip

	config BR2_STRIP_strip
	bool "strip"
	depends on !BR2_ELF2FLT
	help
	Binaries and libraries in the target filesystem will be
	stripped using the normal 'strip' command. This allows to
	save space, mainly by removing debugging symbols. Debugging
	symbols on the target are needed for native debugging, but
	not when remote debugging is used.

	config BR2_STRIP_sstrip
	bool "sstrip"
	select BR2_PACKAGE_SSTRIP_HOST
	depends on !BR2_ELF2FLT
	help
	Binaries and libraries in the target filesystem will be
	stripped using the 'sstrip' command, which strips a little
	bit more than the traditional 'strip' command. This allows to
	save space, mainly by removing debugging symbols. Debugging
	symbols on the target are needed for native debugging, but
	not when remote debugging is used.

	config BR2_STRIP_none
	bool "none"
	help
	Do not strip binaries and libraries in the target
	filesystem.
	endchoice

	config BR2_STRIP_EXCLUDE_FILES
	string "executables that should not be stripped"
	depends on !BR2_STRIP_none
	default ""
	help
	You may specify a space-separated list of binaries and libraries
	here that should not be stripped on the target.

	config BR2_STRIP_EXCLUDE_DIRS
	string "directories that should be skipped when stripping"
	depends on !BR2_STRIP_none
	default ""
	help
	You may specify a space-separated list of directories that should
	be skipped when stripping. Binaries and libraries in these
	directories will not be touched.
	The directories should be specified relative to the target directory,
	without leading slash.

	choice
	prompt "gcc optimization level"
	default BR2_OPTIMIZE_S
	help
	Set the optimization level for gcc

	config BR2_OPTIMIZE_0
	bool "optimization level 0"
	help
	Do not optimize. This is the default.

	config BR2_OPTIMIZE_1
	bool "optimization level 1"
	help
	Optimize. Optimizing compilation takes somewhat more time,
	and a lot more memory for a large function. With -O, the
	compiler tries to reduce code size and execution time,
	without performing any optimizations that take a great deal
	of compilation time. -O turns on the following optimization
	flags: -fdefer-pop -fdelayed-branch -fguess-branch-probability
	-fcprop-registers -floop-optimize -fif-conversion
	-fif-conversion2 -ftree-ccp -ftree-dce -ftree-dominator-opts
	-ftree-dse -ftree-ter -ftree-lrs -ftree-sra -ftree-copyrename
	-ftree-fre -ftree-ch -funit-at-a-time -fmerge-constants
	-O also turns on -fomit-frame-pointer on machines where doing
	so does not interfere with debugging.

	config BR2_OPTIMIZE_2
	bool "optimization level 2"
	help
	Optimize even more. GCC performs nearly all supported optimizations
	that do not involve a space-speed tradeoff. The compiler does not
	perform loop unrolling or function inlining when you specify -O2.
	As compared to -O, this option increases both compilation time and
	the performance of the generated code. -O2 turns on all optimization
	flags specified by -O. It also turns on the following optimization
	flags: -fthread-jumps -fcrossjumping -foptimize-sibling-calls
	-fcse-follow-jumps -fcse-skip-blocks -fgcse -fgcse-lm
	-fexpensive-optimizations -fstrength-reduce -frerun-cse-after-loop
	-frerun-loop-opt -fcaller-saves -fpeephole2 -fschedule-insns
	-fschedule-insns2 -fsched-interblock -fsched-spec -fregmove
	-fstrict-aliasing -fdelete-null-pointer-checks -freorder-blocks
	-freorder-functions -falign-functions -falign-jumps -falign-loops
	-falign-labels -ftree-vrp -ftree-pre
	Please note the warning under -fgcse about invoking -O2 on programs
	that use computed gotos.

	config BR2_OPTIMIZE_3
	bool "optimization level 3"
	help
	Optimize yet more. -O3 turns on all optimizations specified by -O2
	and also turns on the -finline-functions, -funswitch-loops and
	-fgcse-after-reload options.

	config BR2_OPTIMIZE_S
	bool "optimize for size"
	help
	Optimize for size. -Os enables all -O2 optimizations that do not
	typically increase code size. It also performs further optimizations
	designed to reduce code size. -Os disables the following optimization
	flags: -falign-functions -falign-jumps -falign-loops -falign-labels
	-freorder-blocks -freorder-blocks-and-partition -fprefetch-loop-arrays
	-ftree-vect-loop-version

	endchoice

	config BR2_PREFER_STATIC_LIB
	bool "prefer static libraries"
	help
	Where possible, build and use static libraries for the target.
	This potentially increases your code size and should only be
	used if you know what you do.
	The default is to build dynamic libraries and use those on
	the target filesystem.

	WARNING: This is highly experimental at the moment.

	config BR2_HAVE_DOCUMENTATION
	bool "documentation on the target"
	# We no longer want to support a toolchain on the target
	depends on BR2_DEPRECATED
	help
	Install the documentation, including manual pages and info
	pages, on the target.
	If you say n here, your target will not contain any
	documentation.

	config BR2_HAVE_DEVFILES
	bool "development files in target filesystem"
	# We no longer want to support a toolchain on the target
	depends on BR2_DEPRECATED
	help
	Install headers and static libraries in the
	target filesystem

	config BR2_PACKAGE_OVERRIDE_FILE
	string "location of a package override file"
	default "$(TOPDIR)/local.mk"
	help
	A package override file is a short makefile that contains
	variable definitions of the form <pkg>_OVERRIDE_SRCDIR,
	which allows to tell Buildroot to use an existing directory
	as the source directory for a particular package. See the
	Buildroot documentation for more details on this feature.

	endmenu

	source "toolchain/Config.in"

	source "system/Config.in"

	source "package/Config.in"

	source "package/Config.in.host"

	source "fs/Config.in"

	source "boot/Config.in"

	source "linux/Config.in"

	source "Config.in.legacy"