f044e03776
This allows ccache to re-use its cache contents even if the compiler binary mtime has changed. It is the simplest approach to solve this problem, and it works for the internal, external and crosstool-ng toolchain backends. Of course, it leaves the user responsible for invalidating the cache when necessary, but there doesn't seem to be a real good solution that allows both to: 1/ keep the cache contents accross builds and re-use it and 2/ invalidate the cache automatically when the compiler chances in an incompatible way. Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
388 lines
11 KiB
Plaintext
388 lines
11 KiB
Plaintext
#
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mainmenu "Buildroot $BR2_VERSION Configuration"
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config BR2_HAVE_DOT_CONFIG
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bool
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default y
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config BR2_VERSION
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string
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option env="BR2_VERSION_FULL"
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source "target/Config.in.arch"
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menu "Build options"
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menu "Commands"
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config BR2_WGET
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string "Wget command"
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default "wget --passive-ftp -nd -t 3"
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config BR2_SVN
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string "Subversion (svn) command"
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default "svn"
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config BR2_BZR
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string "Bazaar (bzr) command"
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default "bzr"
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config BR2_GIT
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string "Git command"
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default "git"
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config BR2_LOCALFILES
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string "Local files retrieval command"
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default "cp"
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config BR2_SCP
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string "Secure copy (scp) command"
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default "scp"
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config BR2_SSH
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string "Secure shell (ssh) command"
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default "ssh"
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config BR2_HG
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string "Mercurial (hg) command"
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default "hg"
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config BR2_ZCAT
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string "zcat command"
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default "gzip -d -c"
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help
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Command to be used to extract a gzip'ed file to stdout.
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zcat is identical to gunzip -c except that the former may
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not be available on your system.
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Default is "gzip -d -c"
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Other possible values include "gunzip -c" or "zcat".
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config BR2_BZCAT
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string "bzcat command"
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default "bzcat"
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help
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Command to be used to extract a bzip2'ed file to stdout.
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bzcat is identical to bunzip2 -c except that the former may
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not be available on your system.
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Default is "bzcat"
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Other possible values include "bunzip2 -c" or "bzip2 -d -c".
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config BR2_XZCAT
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string "xzcat command"
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default "xzcat"
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help
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Command to be used to extract a xz'ed file to stdout.
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Default is "xzcat"
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config BR2_TAR_OPTIONS
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string "Tar options"
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default ""
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help
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Options to pass to tar when extracting the sources.
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E.g. " -v --exclude='*.svn*'" to exclude all .svn internal files
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and to be verbose.
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endmenu
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config BR2_DL_DIR
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string "Download dir"
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default "$(TOPDIR)/dl"
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help
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Directory to store all the source files that we need to fetch.
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If the Linux shell environment has defined the BUILDROOT_DL_DIR
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environment variable, then this overrides this configuration item.
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The default is $(TOPDIR)/dl
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config BR2_HOST_DIR
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string "Host dir"
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default "$(BASE_DIR)/host"
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help
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Directory to store all the binary files that are built for the host.
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This includes the cross compilation toolchain when building the
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internal buildroot toolchain.
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The default is $(BASE_DIR)/host
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menu "Mirrors and Download locations"
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config BR2_PRIMARY_SITE
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string "Primary download site"
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default ""
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help
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Primary site to download from. If this option is set then buildroot
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will try to download package source first from this site and try the
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default if the file is not found.
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Valid URIs are URIs recognized by $(WGET) and scp URIs of the form
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scp://[user@]host:path.
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NOTE: This works for all packages using the central package
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infrastructure (generic, autotools, cmake, ...)
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config BR2_BACKUP_SITE
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string "Backup download site"
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default "http://sources.buildroot.net/"
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help
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Backup site to download from. If this option is set then buildroot
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will fall back to download package sources from here if the
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normal location fails.
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config BR2_SOURCEFORGE_MIRROR
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string "Sourceforge mirror site"
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default "kent"
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help
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Sourceforge has a system of mirror sites. Some sites may be
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closer to your location, and sometimes mirror sites go down
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and are no longer available. This option allows you to select
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your preferred Sourceforge mirror site.
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The list of mirrors is available here:
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http://sourceforge.net/apps/trac/sourceforge/wiki/Mirrors
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config BR2_KERNEL_MIRROR
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string "Kernel.org mirror"
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default "http://www.kernel.org/pub/"
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help
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kernel.org is mirrored on a number of servers around the world.
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The following allows you to select your preferred mirror.
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Have a look on the kernel.org site for a list of mirrors, then enter
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the URL to the base directory. Examples:
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http://www.XX.kernel.org/pub (XX = country code)
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http://mirror.aarnet.edu.au/pub/ftp.kernel.org
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config BR2_GNU_MIRROR
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string "GNU Software mirror"
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default "http://ftp.gnu.org/pub/gnu"
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help
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GNU has multiple software mirrors scattered around the world.
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The following allows you to select your preferred mirror.
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Have a look on the gnu.org site for a list of mirrors, then enter
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the URL to the base directory. Examples:
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http://ftp.gnu.org/pub/gnu
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http://mirror.aarnet.edu.au/pub/gnu
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config BR2_DEBIAN_MIRROR
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string "Debian Software mirror"
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default "http://ftp.debian.org"
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help
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Debian has multiple software mirrors scattered around the world.
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The following allows you to select your preferred mirror.
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Usually, just add your country code like XX here:
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http://ftp.XX.debian.org
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endmenu
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config BR2_JLEVEL
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int "Number of jobs to run simultaneously"
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default "2"
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help
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Number of jobs to run simultaneously
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config BR2_CCACHE
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bool "Enable compiler cache"
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help
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This option will enable the use of ccache, a compiler
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cache. It will cache the result of previous builds to speed
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up future builds. The cache is stored in
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$HOME/.buildroot-ccache.
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Note that Buildroot does not try to invalidate the cache
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contents when the compiler changes in an incompatible
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way. Therefore, if you make a change to the compiler version
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and/or configuration, you are responsible for purging the
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ccache cache by removing the $HOME/.buildroot-ccache
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directory.
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config BR2_DEPRECATED
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bool "Show packages that are deprecated or obsolete"
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help
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This option hides outdated/obsolete versions of packages.
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config BR2_ENABLE_DEBUG
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bool "build packages with debugging symbols"
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select BR2_PACKAGE_GDB_SERVER
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help
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Build packages with debugging symbols
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enabled
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if BR2_ENABLE_DEBUG
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choice
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prompt "gcc debug level"
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default BR2_DEBUG_2
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help
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Set the debug level for gcc
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config BR2_DEBUG_1
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bool "debug level 1"
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help
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Debug level 1 produces minimal information, enough
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for making backtraces in parts of the program that
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you don't plan to debug. This includes descriptions
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of functions and external variables, but no information
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about local variables and no line numbers.
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config BR2_DEBUG_2
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bool "debug level 2"
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help
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The default gcc debug level is 2
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config BR2_DEBUG_3
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bool "debug level 3"
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help
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Level 3 includes extra information, such as all the
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macro definitions present in the program. Some debuggers
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support macro expansion when you use -g3.
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endchoice
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endif
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choice
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prompt "strip"
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default BR2_STRIP_strip
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help
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Select whether to strip binaries and libraries for the target
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or not.
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strip is the normal strip command
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sstrip is a strip that discards more than the normal strip
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none do not strip (only for debugging!)
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config BR2_STRIP_strip
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bool "strip"
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depends on !BR2_ELF2FLT
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help
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strip is the normal strip command
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config BR2_STRIP_sstrip
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bool "sstrip"
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select BR2_PACKAGE_SSTRIP_HOST
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depends on !BR2_ELF2FLT
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help
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sstrip is a strip that discards more than the normal strip
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config BR2_STRIP_none
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bool "none"
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help
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none do not strip (only for debugging!)
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endchoice
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choice
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prompt "gcc optimization level"
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default BR2_OPTIMIZE_S
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help
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Set the optimization level for gcc
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config BR2_OPTIMIZE_0
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bool "optimization level 0"
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help
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Do not optimize. This is the default.
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config BR2_OPTIMIZE_1
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bool "optimization level 1"
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help
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Optimize. Optimizing compilation takes somewhat more time,
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and a lot more memory for a large function. With -O, the
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compiler tries to reduce code size and execution time,
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without performing any optimizations that take a great deal
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of compilation time. -O turns on the following optimization
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flags: -fdefer-pop -fdelayed-branch -fguess-branch-probability
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-fcprop-registers -floop-optimize -fif-conversion
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-fif-conversion2 -ftree-ccp -ftree-dce -ftree-dominator-opts
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-ftree-dse -ftree-ter -ftree-lrs -ftree-sra -ftree-copyrename
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-ftree-fre -ftree-ch -funit-at-a-time -fmerge-constants
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-O also turns on -fomit-frame-pointer on machines where doing
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so does not interfere with debugging.
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config BR2_OPTIMIZE_2
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bool "optimization level 2"
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help
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Optimize even more. GCC performs nearly all supported optimizations
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that do not involve a space-speed tradeoff. The compiler does not
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perform loop unrolling or function inlining when you specify -O2.
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As compared to -O, this option increases both compilation time and
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the performance of the generated code. -O2 turns on all optimization
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flags specified by -O. It also turns on the following optimization
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flags: -fthread-jumps -fcrossjumping -foptimize-sibling-calls
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-fcse-follow-jumps -fcse-skip-blocks -fgcse -fgcse-lm
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-fexpensive-optimizations -fstrength-reduce -frerun-cse-after-loop
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-frerun-loop-opt -fcaller-saves -fpeephole2 -fschedule-insns
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-fschedule-insns2 -fsched-interblock -fsched-spec -fregmove
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-fstrict-aliasing -fdelete-null-pointer-checks -freorder-blocks
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-freorder-functions -falign-functions -falign-jumps -falign-loops
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-falign-labels -ftree-vrp -ftree-pre
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Please note the warning under -fgcse about invoking -O2 on programs
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that use computed gotos.
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config BR2_OPTIMIZE_3
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bool "optimization level 3"
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help
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Optimize yet more. -O3 turns on all optimizations specified by -O2
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and also turns on the -finline-functions, -funswitch-loops and
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-fgcse-after-reload options.
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config BR2_OPTIMIZE_S
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bool "optimize for size"
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help
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Optimize for size. -Os enables all -O2 optimizations that do not
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typically increase code size. It also performs further optimizations
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designed to reduce code size. -Os disables the following optimization
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flags: -falign-functions -falign-jumps -falign-loops -falign-labels
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-freorder-blocks -freorder-blocks-and-partition -fprefetch-loop-arrays
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-ftree-vect-loop-version
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endchoice
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config BR2_PREFER_STATIC_LIB
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bool "prefer static libraries"
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help
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Where possible, build and use static libraries for the target.
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This potentially increases your code size and should only be
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used if you know what you do.
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The default is to build dynamic libraries and use those on
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the target filesystem.
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WARNING: This is highly experimental at the moment.
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config BR2_HAVE_DOCUMENTATION
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bool "documentation on the target"
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help
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Install the documentation, including manual pages and info
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pages, on the target.
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If you say n here, your target will not contain any
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documentation.
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config BR2_HAVE_DEVFILES
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bool "development files in target filesystem"
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help
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Install headers and static libraries in the
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target filesystem
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config BR2_PACKAGE_OVERRIDE_FILE
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string "location of a package override file"
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default "$(TOPDIR)/local.mk"
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help
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A package override file is a short makefile that contains
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variable definitions of the form <pkg>_OVERRIDE_SRCDIR,
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which allows to tell Buildroot to use an existing directory
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as the source directory for a particular package. See the
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Buildroot documentation for more details on this feature.
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endmenu
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source "toolchain/Config.in"
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source "target/generic/Config.in"
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source "package/Config.in"
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source "package/Config.in.host"
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source "fs/Config.in"
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source "boot/Config.in"
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source "linux/Config.in"
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