# mainmenu "Buildroot $BR2_VERSION Configuration" config BR2_HAVE_DOT_CONFIG bool default y config BR2_VERSION string option env="BR2_VERSION_FULL" config BR2_HOSTARCH string option env="HOSTARCH" source "target/Config.in.arch" menu "Build options" menu "Commands" config BR2_WGET string "Wget command" default "wget --passive-ftp -nd -t 3" config BR2_SVN string "Subversion (svn) command" default "svn" config BR2_BZR string "Bazaar (bzr) command" default "bzr" config BR2_GIT string "Git command" default "git" config BR2_LOCALFILES string "Local files retrieval command" default "cp" config BR2_SCP string "Secure copy (scp) command" default "scp" config BR2_SSH string "Secure shell (ssh) command" default "ssh" config BR2_HG string "Mercurial (hg) command" default "hg" config BR2_ZCAT string "zcat command" default "gzip -d -c" help Command to be used to extract a gzip'ed file to stdout. zcat is identical to gunzip -c except that the former may not be available on your system. Default is "gzip -d -c" Other possible values include "gunzip -c" or "zcat". config BR2_BZCAT string "bzcat command" default "bzcat" help Command to be used to extract a bzip2'ed file to stdout. bzcat is identical to bunzip2 -c except that the former may not be available on your system. Default is "bzcat" Other possible values include "bunzip2 -c" or "bzip2 -d -c". config BR2_XZCAT string "xzcat command" default "xzcat" help Command to be used to extract a xz'ed file to stdout. Default is "xzcat" config BR2_TAR_OPTIONS string "Tar options" default "" help Options to pass to tar when extracting the sources. E.g. " -v --exclude='*.svn*'" to exclude all .svn internal files and to be verbose. endmenu config BR2_DL_DIR string "Download dir" default "$(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" 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" 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 _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 "target/generic/Config.in" source "package/Config.in" source "package/Config.in.host" source "fs/Config.in" source "boot/Config.in" source "linux/Config.in"