![Thomas Petazzoni](/assets/img/avatar_default.png)
Many users trying to use external toolchains on x86-64 machines get a very confusing message: "Can't execute cross-compiler" They get this message because they forgot to install the 32 bits compatibility libraries that are needed to run binaries compiled for x86 on x86-64 machines. Since this is the case for both external toolchains and certain binary-only tools like SAM-BA, we add a new Kconfig option BR2_HOSTARCH_NEEDS_IA32_LIBS, that packages must select if they need the 32 bits compatibility libraries. When this option is enabled, dependencies.sh checks that the 32 bits dynamic library loader is present on the system, and if not, it stops and shows an error. The path and name of the 32 bits dynamic loader is hardcoded because it is very unlikely to change, as it would break the ABI for all binaries. Also, it is worth noting that the check will be done even if we're running on a 32 bits machine. This is harmless, as 32 bits machines necessarily have the 32 bits dynamic loader installed, so the error will never show up in this case. Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
445 lines
13 KiB
Plaintext
445 lines
13 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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config BR2_HOSTARCH
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string
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option env="HOSTARCH"
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# Hidden boolean selected by pre-built packages for x86, when they
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# need to run on x86-64 machines (example: pre-built external
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# toolchains, binary tools like SAM-BA, etc.).
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config BR2_HOSTARCH_NEEDS_IA32_LIBS
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bool
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source "arch/Config.in"
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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_PRIMARY_SITE_ONLY
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bool "Only allow downloads from primary download site"
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depends on BR2_PRIMARY_SITE != ""
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help
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If this option is enabled, downloads will only be attempted
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from the primary download site. Other locations, like the
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package's official download location or the backup download
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site, will not be considered. Therefore, if the package is
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not present on the primary site, the download fails.
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This is useful for project developers who want to ensure
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that the project can be built even if the upstream tarball
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locations disappear.
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if !BR2_PRIMARY_SITE_ONLY
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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_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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endif
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endmenu
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config BR2_JLEVEL
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int "Number of jobs to run simultaneously (0 for auto)"
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default "0"
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help
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Number of jobs to run simultaneously. If 0, determine
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automatically according to number of CPUs on the host
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system.
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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 $HOME/.buildroot-ccache
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directory.
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config BR2_CCACHE_DIR
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string "Compiler cache location"
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depends on BR2_CCACHE
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default "$(HOME)/.buildroot-ccache"
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help
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Where ccache should store cached files.
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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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help
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Build packages with debugging symbols enabled. All libraries
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and binaries in the 'staging' directory will have debugging
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symbols, which allows remote debugging even if libraries and
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binaries are stripped on the target. Whether libraries and
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binaries are stripped on the target is controlled by the
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BR2_STRIP_* options below.
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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 command for binaries on target"
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default BR2_STRIP_strip
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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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Binaries and libraries in the target filesystem will be
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stripped using the normal 'strip' command. This allows to
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save space, mainly by removing debugging symbols. Debugging
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symbols on the target are needed for native debugging, but
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not when remote debugging is used.
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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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Binaries and libraries in the target filesystem will be
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stripped using the 'sstrip' command, which strips a little
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bit more than the traditional 'strip' command. This allows to
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save space, mainly by removing debugging symbols. Debugging
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symbols on the target are needed for native debugging, but
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not when remote debugging is used.
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config BR2_STRIP_none
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bool "none"
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help
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Do not strip binaries and libraries in the target
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filesystem.
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endchoice
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config BR2_STRIP_EXCLUDE_FILES
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string "executables that should not be stripped"
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depends on !BR2_STRIP_none
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default ""
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help
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You may specify a space-separated list of binaries and libraries
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here that should not be stripped on the target.
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config BR2_STRIP_EXCLUDE_DIRS
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string "directories that should be skipped when stripping"
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depends on !BR2_STRIP_none
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default ""
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help
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You may specify a space-separated list of directories that should
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be skipped when stripping. Binaries and libraries in these
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directories will not be touched.
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The directories should be specified relative to the target directory,
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without leading slash.
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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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# We no longer want to support a toolchain on the target
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depends on BR2_DEPRECATED
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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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# We no longer want to support a toolchain on the target
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depends on BR2_DEPRECATED
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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 "system/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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source "Config.in.legacy"
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