gentoo-x86/eclass/multilib.eclass

# Copyright 1999-2008 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Header: /var/cvsroot/gentoo-x86/eclass/multilib.eclass,v 1.64 2008/05/02 04:07:38 vapier Exp $

# @ECLASS: multilib.eclass
# @MAINTAINER:
# amd64@gentoo.org
# toolchain@gentoo.org
# @BLURB: This eclass is for all functions pertaining to handling multilib configurations.
# @DESCRIPTION:
# This eclass is for all functions pertaining to handling multilib configurations.

___ECLASS_RECUR_MULTILIB="yes"
[[ -z ${___ECLASS_RECUR_TOOLCHAIN_FUNCS} ]] && inherit toolchain-funcs

# is_final_abi:
# Return true if ${ABI} is the final abi to be installed (and thus we are
# on our last run through a src_* function.

# number_abis:
# echo the number of ABIs we will be installing for

# get_install_abis:
# Return a list of the ABIs we want to install for with
# the last one in the list being the default.

# get_all_abis:
# Return a list of the ABIs supported by this profile.
# the last one in the list being the default.

# get_all_libdirs:
# Returns a list of all the libdirs used by this profile.  This includes
# those that might not be touched by the current ebuild and always includes
# "lib".

# get_libdir:
# Returns the libdir for the selected ABI.  This is backwards compatible
# and simply calls get_abi_LIBDIR() on newer profiles.  You should use this
# to determine where to install shared objects (ex: /usr/$(get_libdir))

# get_abi_var <VAR> [<ABI>]:
# returns the value of ${<VAR>_<ABI>} which should be set in make.defaults
#
# get_abi_CFLAGS:
# get_abi_CDEFINE:
# get_abi_LIBDIR:
# Aliases for 'get_abi_var CFLAGS', etc.

# get_ml_incdir [<include dir> [<ABI>]]
# include dir defaults to /usr/include
# ABI defaults to ${ABI} or ${DEFAULT_ABI}
#
# If a multilib include dir is associated with the passed include dir, then
# we return it, otherwise, we just echo back the include dir.  This is
# neccessary when a built script greps header files rather than testing them
# via #include (like perl) to figure out features.

# prep_ml_includes:
# Some includes (include/asm, glibc, etc) are ABI dependent.  In this case,
# We can install them in different locations for each ABI and create a common
# header which includes the right one based on CDEFINE_${ABI}.  If your
# package installs ABI-specific headers, just add 'prep_ml_includes' to the
# end of your src_install().  It takes a list of directories that include
# files are installed in (default is /usr/include if none are passed).
#
# Example:
# src_install() {
#    ...
#    prep_ml_includes /usr/qt/3/include
# }

# create_ml_includes <include dir> <symbol 1>:<dir 1> [<symbol 2>:<dir 2> ...]
# If you need more control than prep_ml_includes can offer (like linux-headers
# for the asm-* dirs, then use create_ml_includes.  The firs argument is the
# common dir.  The remaining args are of the form <symbol>:<dir> where
# <symbol> is what is put in the #ifdef for choosing that dir.
#
# Ideas for this code came from debian's sparc-linux headers package.
#
# Example:
# create_ml_includes /usr/include/asm __sparc__:/usr/include/asm-sparc __sparc64__:/usr/include/asm-sparc64
# create_ml_includes /usr/include/asm __i386__:/usr/include/asm-i386 __x86_64__:/usr/include/asm-x86_64

# get_libname [version]
# returns libname with proper suffix {.so,.dylib} and optionally supplied version
# for ELF/MACH-O shared objects
#
# Example:
# get_libname libfoo ${PV}
# Returns: libfoo.so.${PV} (ELF) || libfoo.${PV}.dylib (MACH)

### END DOCUMENTATION ###

# Defaults:
export MULTILIB_ABIS=${MULTILIB_ABIS:-"default"}
export DEFAULT_ABI=${DEFAULT_ABI:-"default"}
export CFLAGS_default
export LDFLAGS_default
export CHOST_default=${CHOST_default:-${CHOST}}
export CTARGET_default=${CTARGET_default:-${CTARGET:-${CHOST_default}}}
export LIBDIR_default=${CONF_LIBDIR:-"lib"}
export CDEFINE_default="__unix__"
export KERNEL_ABI=${KERNEL_ABI:-${DEFAULT_ABI}}

# @FUNCTION: has_multilib_profile
# @DESCRIPTION:
# Return true if the current profile is a multilib profile and lists more than
# one abi in ${MULTILIB_ABIS}.  When has_multilib_profile returns true, that
# profile should enable the 'multilib' use flag. This is so you can DEPEND on
# a package only for multilib or not multilib.
has_multilib_profile() {
        [ -n "${MULTILIB_ABIS}" -a "${MULTILIB_ABIS}" != "${MULTILIB_ABIS/ /}" ]
}

# @FUNCTION: get_libdir
# @RETURN: the libdir for the selected ABI
# @DESCRIPTION:
# This function simply returns the desired lib directory. With portage
# 2.0.51, we now have support for installing libraries to lib32/lib64
# to accomidate the needs of multilib systems. It's no longer a good idea
# to assume all libraries will end up in lib. Replace any (sane) instances
# where lib is named directly with $(get_libdir) if possible.
#
# Jeremy Huddleston <eradicator@gentoo.org> (23 Dec 2004):
#   Added support for ${ABI} and ${DEFAULT_ABI}.  If they're both not set,
#   fall back on old behavior.  Any profile that has these set should also
#   depend on a newer version of portage (not yet released) which uses these
#   over CONF_LIBDIR in econf, dolib, etc...
get_libdir() {
        local CONF_LIBDIR
        if [ -n  "${CONF_LIBDIR_OVERRIDE}" ] ; then
                # if there is an override, we want to use that... always.
                echo ${CONF_LIBDIR_OVERRIDE}
        else
                get_abi_LIBDIR
        fi
}

# @FUNCTION: get_multilibdir
# @RETURN: Returns the multilibdir
get_multilibdir() {
        if has_multilib_profile; then
                eerror "get_multilibdir called, but it shouldn't be needed with the new multilib approach.  Please file a bug at http://bugs.gentoo.org and assign it to eradicator@gentoo.org"
                exit 1
        fi
        echo ${CONF_MULTILIBDIR:=lib32}
}

# @FUNCTION: get_libdir_override
# @DESCRIPTION:
# Sometimes you need to override the value returned by get_libdir. A good
# example of this is xorg-x11, where lib32 isnt a supported configuration,
# and where lib64 -must- be used on amd64 (for applications that need lib
# to be 32bit, such as adobe acrobat). Note that this override also bypasses
# portage version sanity checking.
# get_libdir_override expects one argument, the result get_libdir should
# return:
#
#   get_libdir_override lib64
get_libdir_override() {
        if has_multilib_profile; then
                eerror "get_libdir_override called, but it shouldn't be needed with the new multilib approach.  Please file a bug at http://bugs.gentoo.org and assign it to eradicator@gentoo.org"
                exit 1
        fi
        CONF_LIBDIR="$1"
        CONF_LIBDIR_OVERRIDE="$1"
        LIBDIR_default="$1"
}

# @FUNCTION: get_abi_var
# @USAGE: <VAR> [ABI]
# @RETURN: returns the value of ${<VAR>_<ABI>} which should be set in make.defaults
# @DESCRIPTION:
# ex:
# CFLAGS=$(get_abi_var CFLAGS sparc32) # CFLAGS=-m32
#
# Note that the prefered method is to set CC="$(tc-getCC) $(get_abi_CFLAGS)"
# This will hopefully be added to portage soon...
#
# If <ABI> is not specified, ${ABI} is used.
# If <ABI> is not specified and ${ABI} is not defined, ${DEFAULT_ABI} is used.
# If <ABI> is not specified and ${ABI} and ${DEFAULT_ABI} are not defined, we return an empty string.
get_abi_var() {
        local flag=$1
        local abi
        if [ $# -gt 1 ]; then
                abi=${2}
        elif [ -n "${ABI}" ]; then
                abi=${ABI}
        elif [ -n "${DEFAULT_ABI}" ]; then
                abi=${DEFAULT_ABI}
        else
                abi="default"
        fi

        local var="${flag}_${abi}"
        echo ${!var}
}

# @FUNCTION: get_abi_CFLAGS
# @USAGE: [ABI]
# @DESCRIPTION:
# Alias for 'get_abi_var CFLAGS'
get_abi_CFLAGS() { get_abi_var CFLAGS "$@"; }

# @FUNCTION: get_abi_ASFLAGS
# @USAGE: [ABI]
# @DESCRIPTION:
# Alias for 'get_abi_var ASFLAGS'
get_abi_ASFLAGS() { get_abi_var ASFLAGS "$@"; }

# @FUNCTION: get_abi_LDFLAGS
# @USAGE: [ABI]
# @DESCRIPTION:
# Alias for 'get_abi_var LDFLAGS'
get_abi_LDFLAGS() { get_abi_var LDFLAGS "$@"; }

# @FUNCTION: get_abi_CHOST
# @USAGE: [ABI]
# @DESCRIPTION:
# Alias for 'get_abi_var CHOST'
get_abi_CHOST() { get_abi_var CHOST "$@"; }

# @FUNCTION: get_abi_CTARGET
# @USAGE: [ABI]
# @DESCRIPTION:
# Alias for 'get_abi_var CTARGET'
get_abi_CTARGET() { get_abi_var CTARGET "$@"; }

# @FUNCTION: get_abi_FAKE_TARGETS
# @USAGE: [ABI]
# @DESCRIPTION:
# Alias for 'get_abi_var FAKE_TARGETS'
get_abi_FAKE_TARGETS() { get_abi_var FAKE_TARGETS "$@"; }

# @FUNCTION: get_abi_CDEFINE
# @USAGE: [ABI]
# @DESCRIPTION:
# Alias for 'get_abi_var CDEFINE'
get_abi_CDEFINE() { get_abi_var CDEFINE "$@"; }

# @FUNCTION: get_abi_LIBDIR
# @USAGE: [ABI]
# @DESCRIPTION:
# Alias for 'get_abi_var LIBDIR'
get_abi_LIBDIR() { get_abi_var LIBDIR "$@"; }

# @FUNCTION: get_install_abis
# @DESCRIPTION:
# Return a list of the ABIs we want to install for with
# the last one in the list being the default.
get_install_abis() {
        local order=""

        if [[ -z ${MULTILIB_ABIS} ]] ; then
                echo "default"
                return 0
        fi

        if [[ ${EMULTILIB_PKG} == "true" ]] ; then
                for x in ${MULTILIB_ABIS} ; do
                        if [[ ${x} != "${DEFAULT_ABI}" ]] ; then
                                hasq ${x} ${ABI_DENY} || ordera="${ordera} ${x}"
                        fi
                done
                hasq ${DEFAULT_ABI} ${ABI_DENY} || order="${ordera} ${DEFAULT_ABI}"

                if [[ -n ${ABI_ALLOW} ]] ; then
                        local ordera=""
                        for x in ${order} ; do
                                if hasq ${x} ${ABI_ALLOW} ; then
                                        ordera="${ordera} ${x}"
                                fi
                        done
                        order=${ordera}
                fi
        else
                order=${DEFAULT_ABI}
        fi

        if [[ -z ${order} ]] ; then
                die "The ABI list is empty.  Are you using a proper multilib profile?  Perhaps your USE flags or MULTILIB_ABIS are too restrictive for this package."
        fi

        echo ${order}
        return 0
}

# @FUNCTION: get_all_abis
# @DESCRIPTION: 
# Return a list of the ABIs supported by this profile.
# the last one in the list being the default.
get_all_abis() {
        local order=""

        if [[ -z ${MULTILIB_ABIS} ]] ; then
                echo "default"
                return 0
        fi

        for x in ${MULTILIB_ABIS}; do
                if [[ ${x} != ${DEFAULT_ABI} ]] ; then
                        order="${order:+${order} }${x}"
                fi
        done
        order="${order:+${order} }${DEFAULT_ABI}"

        echo ${order}
        return 0
}

# @FUNCTION: get_all_libdirs
# @DESCRIPTION:
# Returns a list of all the libdirs used by this profile.  This includes
# those that might not be touched by the current ebuild and always includes
# "lib".
get_all_libdirs() {
        local libdirs="lib"
        local abi
        local dir

        for abi in ${MULTILIB_ABIS}; do
                [ "$(get_abi_LIBDIR ${abi})" != "lib" ] && libdirs="${libdirs} $(get_abi_LIBDIR ${abi})"
        done

        echo "${libdirs}"
}

# @FUNCTION: is_final_abi
# @DESCRIPTION:
# Return true if ${ABI} is the last ABI on our list (or if we're not
# using the new multilib configuration.  This can be used to determine
# if we're in the last (or only) run through src_{unpack,compile,install}
is_final_abi() {
        has_multilib_profile || return 0
        local ALL_ABIS=$(get_install_abis)
        local LAST_ABI=${ALL_ABIS/* /}
        [[ ${LAST_ABI} == ${ABI} ]]
}

# @FUNCTION: number_abis
# @DESCRIPTION:
# echo the number of ABIs we will be installing for
number_abis() {
        get_install_abis | wc -w
}

# @FUNCTION: get_ml_incdir
# @USAGE: [include_dir] [ABI]
# @DESCRIPTION:
# include dir defaults to /usr/include
# ABI defaults to ${ABI} or ${DEFAULT_ABI}
#
# If a multilib include dir is associated with the passed include dir, then
# we return it, otherwise, we just echo back the include dir.  This is
# neccessary when a built script greps header files rather than testing them
# via #include (like perl) to figure out features.
get_ml_incdir() {
        local dir=/usr/include

        if [[ $# -gt 0 ]]; then
                incdir=$1
                shift
        fi

        if [[ -z "${MULTILIB_ABIS}" ]]; then
                echo ${incdir}
                return 0
        fi

        local abi=${ABI-${DEFAULT_ABI}}
        if [[ $# -gt 0 ]]; then
                abi=$1
                shift
        fi

        if [[ -d "${dir}/gentoo-multilib/${abi}" ]]; then
                echo ${dir}/gentoo-multilib/${abi}
        else
                echo ${dir}
        fi
}

# @FUNCTION: prep_ml_includes
# @DESCRIPTION:
# Some includes (include/asm, glibc, etc) are ABI dependent.  In this case,
# We can install them in different locations for each ABI and create a common
# header which includes the right one based on CDEFINE_${ABI}.  If your
# package installs ABI-specific headers, just add 'prep_ml_includes' to the
# end of your src_install().  It takes a list of directories that include
# files are installed in (default is /usr/include if none are passed).
#
# Example:
#     src_install() {
#        ...
#        prep_ml_includes /usr/qt/3/include
#     }
prep_ml_includes() {
        if [[ $(number_abis) -gt 1 ]] ; then
                local dir
                local dirs
                local base

                if [[ $# -eq 0 ]] ; then
                        dirs=/usr/include
                else
                        dirs="$@"
                fi

                for dir in ${dirs} ; do
                        base=${T}/gentoo-multilib/${dir}/gentoo-multilib
                        mkdir -p "${base}"
                        [[ -d ${base}/${ABI} ]] && rm -rf "${base}/${ABI}"
                        mv "${D}/${dir}" "${base}/${ABI}"
                done

                if is_final_abi; then
                        base=${T}/gentoo-multilib
                        pushd "${base}"
                        find . | tar -c -T - -f - | tar -x --no-same-owner -f - -C ${D}
                        popd

                        # This 'set' stuff is required by mips profiles to properly pass
                        # CDEFINE's (which have spaces) to sub-functions
                        set --
                        for dir in ${dirs} ; do
                                set -- "$@" "${dir}"
                                local abi
                                for abi in $(get_install_abis); do
                                        set -- "$@" "$(get_abi_CDEFINE ${abi}):${dir}/gentoo-multilib/${abi}"
                                done
                                create_ml_includes "$@"
                        done
                fi
        fi
}

# @FUNCTION: create_ml_includes
# @USAGE: <include_dir> <symbol_1>:<dir_1> [<symbol_2>:<dir_2>...]
# @DESCRIPTION:
# If you need more control than prep_ml_includes can offer (like linux-headers
# for the asm-* dirs, then use create_ml_includes.  The firs argument is the
# common dir.  The remaining args are of the form <symbol>:<dir> where
# <symbol> is what is put in the #ifdef for choosing that dir.
#
# Ideas for this code came from debian's sparc-linux headers package.
#
# Example:
#     create_ml_includes /usr/include/asm __sparc__:/usr/include/asm-sparc __sparc64__:/usr/include/asm-sparc64
#     create_ml_includes /usr/include/asm __i386__:/usr/include/asm-i386 __x86_64__:/usr/include/asm-x86_64
#
# Warning: Be careful with the ordering here. The default ABI has to be the
# last, because it is always defined (by GCC)
create_ml_includes() {
        local dest=$1
        shift
        local basedirs=$(create_ml_includes-listdirs "$@")

        create_ml_includes-makedestdirs ${dest} ${basedirs}

        local file
        for file in $(create_ml_includes-allfiles ${basedirs}) ; do
                #local name=$(echo ${file} | tr '[:lower:]' '[:upper:]' | sed 's:[^[:upper:]]:_:g')
                (
                        echo "/* Autogenerated by create_ml_includes() in multilib.eclass */"

                        local dir
                        for dir in ${basedirs}; do
                                if [[ -f ${D}/${dir}/${file} ]] ; then
                                        echo ""
                                        local sym=$(create_ml_includes-sym_for_dir ${dir} "$@")
                                        if [[ ${sym/=} != "${sym}" ]] ; then
                                                echo "#if ${sym}"
                                        elif [[ ${sym::1} == "!" ]] ; then
                                                echo "#ifndef ${sym:1}"
                                        else
                                                echo "#ifdef ${sym}"
                                        fi
                                        echo "# include <$(create_ml_includes-absolute ${dir}/${file})>"
                                        echo "#endif /* ${sym} */"
                                fi
                        done

                        #echo "#endif /* __CREATE_ML_INCLUDES_STUB_${name}__ */"
                ) > "${D}/${dest}/${file}"
        done
}

# Helper function for create_ml_includes
create_ml_includes-absolute() {
        local dst="$(create_ml_includes-tidy_path $1)"

        dst=(${dst//\// })

        local i
        for ((i=0; i<${#dst[*]}; i++)); do
                [ "${dst[i]}" == "include" ] && break
        done

        local strip_upto=$i

        for ((i=strip_upto+1; i<${#dst[*]}-1; i++)); do
                echo -n ${dst[i]}/
        done

        echo -n ${dst[i]}
}

# Helper function for create_ml_includes
create_ml_includes-tidy_path() {
        local removed=$1

        if [ -n "${removed}" ]; then
                # Remove multiple slashes
                while [ "${removed}" != "${removed/\/\//\/}" ]; do
                        removed=${removed/\/\//\/}
                done

                # Remove . directories
                while [ "${removed}" != "${removed//\/.\//\/}" ]; do
                        removed=${removed//\/.\//\/}
                done
                [ "${removed##*/}" = "." ] && removed=${removed%/*}

                # Removed .. directories
                while [ "${removed}" != "${removed//\/..\/}" ]; do
                        local p1="${removed%%\/..\/*}"
                        local p2="${removed#*\/..\/}"

                        removed="${p1%\/*}/${p2}"
                done

                # Remove trailing ..
                [ "${removed##*/}" = ".." ] && removed=${removed%/*/*}

                # Remove trailing /
                [ "${removed##*/}" = "" ] && removed=${removed%/*}

                echo ${removed}
        fi
}

# Helper function for create_ml_includes
create_ml_includes-listdirs() {
        local dirs
        local data
        for data in "$@"; do
                dirs="${dirs} ${data/*:/}"
        done
        echo ${dirs:1}
}

# Helper function for create_ml_includes
create_ml_includes-makedestdirs() {
        local dest=$1
        shift
        local basedirs=$@

        dodir ${dest}

        local basedir
        for basedir in ${basedirs}; do
                local dir
                for dir in $(find ${D}/${basedir} -type d); do
                        dodir ${dest}/${dir/${D}\/${basedir}/}
                done
        done
}

# Helper function for create_ml_includes
create_ml_includes-allfiles() {
        local basedir file
        for basedir in "$@" ; do
                for file in $(find "${D}"/${basedir} -type f); do
                        echo ${file/${D}\/${basedir}\//}
                done
        done | sort | uniq
}

# Helper function for create_ml_includes
create_ml_includes-sym_for_dir() {
        local dir=$1
        shift
        local data
        for data in "$@"; do
                if [[ ${data} == *:${dir} ]] ; then
                        echo ${data/:*/}
                        return 0
                fi
        done
        echo "Shouldn't be here -- create_ml_includes-sym_for_dir $1 $@"
        # exit because we'll likely be called from a subshell
        exit 1
}

# @FUNCTION: get_libname
# @USAGE: [version]
# @DESCRIPTION:
# Returns libname with proper suffix {.so,.dylib} and optionally supplied version
# for ELF/MACH-O shared objects
#
# Example:
#     get_libname libfoo ${PV}
#     Returns: libfoo.so.${PV} (ELF) || libfoo.${PV}.dylib (MACH)
get_libname() {
        local libname
        local ver=$1
        case ${CHOST} in
                mingw*|*-mingw*) libname="dll";;
                *-darwin*)       libname="dylib";;
                *)               libname="so";;
        esac

        if [[ -z $* ]] ; then
                echo ".${libname}"
        else
                for ver in "$@" ; do
                        case ${CHOST} in
                                *-darwin*) echo ".${ver}.${libname}";;
                                *)         echo ".${libname}.${ver}";;
                        esac
                done
        fi
}

# This is for the toolchain to setup profile variables when pulling in
# a crosscompiler (and thus they aren't set in the profile)
multilib_env() {
        local CTARGET=${1:-${CTARGET}}

        case ${CTARGET} in
                x86_64*)
                        export CFLAGS_x86=${CFLAGS_x86--m32}
                        export CHOST_x86=${CTARGET/x86_64/i686}
                        export CTARGET_x86=${CHOST_x86}
                        export CDEFINE_x86="__i386__"
                        export LIBDIR_x86="lib"

                        export CFLAGS_amd64=${CFLAGS_amd64--m64}
                        export CHOST_amd64=${CTARGET}
                        export CTARGET_amd64=${CHOST_amd64}
                        export CDEFINE_amd64="__x86_64__"
                        export LIBDIR_amd64="lib64"

                        export MULTILIB_ABIS="amd64 x86"
                        export DEFAULT_ABI="amd64"
                ;;
                mips64*)
                        export CFLAGS_o32=${CFLAGS_o32--mabi=32}
                        export CHOST_o32=${CTARGET/mips64/mips}
                        export CTARGET_o32=${CHOST_o32}
                        export CDEFINE_o32="_MIPS_SIM == _ABIO32"
                        export LIBDIR_o32="lib"

                        export CFLAGS_n32=${CFLAGS_n32--mabi=n32}
                        export CHOST_n32=${CTARGET}
                        export CTARGET_n32=${CHOST_n32}
                        export CDEFINE_n32="_MIPS_SIM == _ABIN32"
                        export LIBDIR_n32="lib32"

                        export CFLAGS_n64=${CFLAGS_n64--mabi=64}
                        export CHOST_n64=${CTARGET}
                        export CTARGET_n64=${CHOST_n64}
                        export CDEFINE_n64="_MIPS_SIM == _ABI64"
                        export LIBDIR_n64="lib64"

                        export MULTILIB_ABIS="n64 n32 o32"
                        export DEFAULT_ABI="n32"
                ;;
                powerpc64*)
                        export CFLAGS_ppc=${CFLAGS_ppc--m32}
                        export CHOST_ppc=${CTARGET/powerpc64/powerpc}
                        export CTARGET_ppc=${CHOST_ppc}
                        export CDEFINE_ppc="!__powerpc64__"
                        export LIBDIR_ppc="lib"

                        export CFLAGS_ppc64=${CFLAGS_ppc64--m64}
                        export CHOST_ppc64=${CTARGET}
                        export CTARGET_ppc64=${CHOST_ppc64}
                        export CDEFINE_ppc64="__powerpc64__"
                        export LIBDIR_ppc64="lib64"

                        export MULTILIB_ABIS="ppc64 ppc"
                        export DEFAULT_ABI="ppc64"
                ;;
                s390x*)
                        export CFLAGS_s390=${CFLAGS_s390--m31} # the 31 is not a typo
                        export CHOST_s390=${CTARGET/s390x/s390}
                        export CTARGET_s390=${CHOST_s390}
                        export CDEFINE_s390="!__s390x__"
                        export LIBDIR_s390="lib"

                        export CFLAGS_s390x=${CFLAGS_s390x--m64}
                        export CHOST_s390x=${CTARGET}
                        export CTARGET_s390x=${CHOST_s390x}
                        export CDEFINE_s390x="__s390x__"
                        export LIBDIR_s390x="lib64"

                        export MULTILIB_ABIS="s390x s390"
                        export DEFAULT_ABI="s390x"
                ;;
                sparc64*)
                        export CFLAGS_sparc32=${CFLAGS_sparc32--m32}
                        export CHOST_sparc32=${CTARGET/sparc64/sparc}
                        export CTARGET_sparc32=${CHOST_sparc32}
                        export CDEFINE_sparc32="!__arch64__"
                        export LIBDIR_sparc32="lib"

                        export CFLAGS_sparc64=${CFLAGS_sparc64--m64}
                        export CHOST_sparc64=${CTARGET}
                        export CTARGET_sparc64=${CHOST_sparc64}
                        export CDEFINE_sparc64="__arch64__"
                        export LIBDIR_sparc64="lib64"

                        export MULTILIB_ABIS="sparc64 sparc32"
                        export DEFAULT_ABI="sparc64"
                ;;
                *)
                        export MULTILIB_ABIS="default"
                        export DEFAULT_ABI="default"
                ;;
        esac
}

# @FUNCTION: multilib_toolchain_setup
# @DESCRIPTION:
# Hide multilib details here for packages which are forced to be compiled for a
# specific ABI when run on another ABI (like x86-specific packages on amd64)
multilib_toolchain_setup() {
        export ABI=$1

        if has_version app-admin/eselect-compiler ; then
                # Binutils doesn't have wrappers for ld and as (yet).  Eventually it
                # will, and all this can just be handled with CHOST.
                export LD="ld $(get_abi_LDFLAGS $1)"
                export AS="as $(get_abi_ASFLAGS $1)"

                export CHOST=$(get_abi_CHOST $1)
                export CBUILD=$(get_abi_CHOST $1)
        else
                tc-export CC
        fi
}