#
# $Id: libs.in,v 1.48 2004/02/03 22:58:55 jmmv Exp $
# Library checks
#
# buildtool
# Copyright (c) 2002, 2003, 2004 Julio M. Merino Vidal.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in
#    the documentation and/or other materials provided with the
#    distribution.
# 3. Neither the name of the author nor the names of contributors may
#    be used to endorse or promote products derived from this software
#    without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS''
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
# TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
# PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR
# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
# USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
# OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#

# --------------------------------------------------------------------
# Generic library checks
# --------------------------------------------------------------------

bt_define_ml_check bt_check_lib

bt_check_lib_c() { btown_check_lib c "$@"; }
bt_check_lib_cxx() { btown_check_lib cxx "$@"; }

btown_check_lib() {
    local lang="$1" libname="$2" funcname="$3"
    local defname cachename
    local cv ret

    if [ -z "${funcname}" ]; then
        defname=$(bt_def_name BT_HAVE_LIB ${lang} ${libname})
        cachename=$(bt_cache_name BT_HAVE_LIB ${lang} ${libname})
        bt_msg_chk "for ${lang} library ${libname}"
        funcname=main
    else
        defname=$(bt_def_name BT_HAVE_FUNC ${lang} ${funcname})
        cachename=$(bt_cache_name BT_HAVE_FUNC ${lang} ${funcname})
        bt_msg_chk "for ${lang} function ${funcname} in library ${libname}"
    fi
    bt_cache ${cachename}

    eval cv=\"\${${cachename}:-name}\"
    if [ ${cv} = yes ]; then
        bt_define ${defname}
        bt_msg_result "yes (cached)"
        ret=0
    elif [ ${cv} = no ]; then
        bt_msg_result "no (cached)"
        ret=1
    else
        local savelibs="${BT_LIBS}"

        BT_LIBS+=-l${libname}
        bt_try_compile_${lang} <<EOF
int ${funcname}();
int main() { printf("%p", ${funcname}); return 0; }
EOF
        ret=$?
        BT_LIBS=${savelibs}
        if [ ${ret} -eq 0 ]; then
            eval ${cachename}=yes
            bt_define ${defname}
            BT_LIBS+=-l${libname}
            bt_msg_result yes
        else
            eval ${cachename}=no
            bt_msg_result no
        fi
    fi

    return ${ret}
}

# --------------------------------------------------------------------
# Specific library checks
# --------------------------------------------------------------------

# NONE AVAILABLE YET

# --------------------------------------------------------------------
# Check how to build libraries
# --------------------------------------------------------------------

bt_check_lib_howto() {
    bt_check_host
    bt_check_env

    case ${Language} in
        c)
            if [ ${BT_PROG_CC_NAME:-unset} != gnu ]; then
                BT_FEATURE_RPATH=no
            fi
            ;;
        cxx)
            if [ ${BT_PROG_CXX_NAME:-unset} != gnu ]; then
                BT_FEATURE_RPATH=no
            fi
            ;;
    esac

    # Let's go with shared ones
    if [ ${BT_FEATURE_SHARED} = no ]; then
        BT_LIB_MKPIC=no
    else
        BT_LIB_PIC_COMPILE_PREARGS="-fPIC -DPIC"
        bt_subst BT_LIB_PIC_COMPILE_PREARGS

        BT_LINK_FLAG_RPATH=
        BT_LINK_FLAG_EXPORTDYNAMIC=
        BT_LIB_PIC_LINK_PREARGS=
        BT_LIB_PIC_SONAME=no
        BT_LIB_PIC_NAMING=GNU
        case ${BT_HOST_OS} in
            Darwin)
                BT_FEATURE_RPATH=no
                BT_LIB_PIC_NAMING=Darwin
                BT_LIB_PIC_LINK_PREARGS=-dylib
                ;;
            FreeBSD|NetBSD|OpenBSD)
                BT_LIB_PIC_COMPILE_PREARGS="-fPIC -DPIC -shared"
                BT_LINK_FLAG_RPATH=-Wl,-R
                BT_LINK_FLAG_EXPORTDYNAMIC=-Wl,-E
                BT_LIB_PIC_LINK_PREARGS=-shared
                BT_LIB_PIC_SONAME=yes
                ;;
            IRIX)
                BT_LINK_FLAG_RPATH=-rpath,
                ;;
            Linux)
                BT_LIB_PIC_COMPILE_PREARGS="-fPIC -DPIC -shared"
                BT_LINK_FLAG_RPATH=-Wl,-R
                BT_LIB_PIC_LINK_PREARGS=-shared
                BT_LIB_PIC_SONAME=yes
                ;;
            SunOS)
                BT_LINK_FLAG_RPATH=-Wl,-R
                ;;
            *)
                ;;
        esac
        bt_subst BT_LINK_FLAG_RPATH
        bt_subst BT_LINK_FLAG_EXPORTDYNAMIC
        bt_subst BT_LIB_PIC_SONAME
        bt_subst BT_LIB_PIC_NAMING
        bt_subst BT_LIB_PIC_LINK_PREARGS

        BT_LIB_PIC_LINK_POSTARGS=
        bt_subst BT_LIB_PIC_LINK_POSTARGS

        BT_LIB_MKPIC=yes
    fi
    bt_subst BT_LIB_MKPIC
    [ ${BT_FEATURE_RPATH} != no ] && BT_FEATURE_RPATH=${BT_LIB_MKPIC}

    # Static libraries are easy...
    bt_check_progs BT_PROG_AR ar
    bt_check_progs BT_PROG_RANLIB ranlib
    if [ ${BT_LIB_MKPIC} = yes -a ${BT_FEATURE_STATIC} = auto ]; then
        BT_LIB_MKSTATIC=no
    elif [ ${BT_LIB_MKPIC} = yes -a ${BT_FEATURE_STATIC} = no ]; then
        BT_LIB_MKSTATIC=no
    else
        BT_LIB_MKSTATIC=yes
    fi
    bt_subst BT_LIB_MKSTATIC

    # Temporary hack
    if [ ${BT_HOST_OS} = SunOS -o ${BT_HOST_OS} = Darwin ]; then
        BT_LIB_MKPIC=no
        BT_LIB_MKSTATIC=yes
        bt_warn "Shared library support for this platform is still broken." \
                "Please submit cc(1) and ld(1) manpages as feedback."
    fi

    if [ -z "${_BT_LIBHOWTO_SUMMARY}" ]; then
        bt_msg_summary "Static libraries: ${BT_LIB_MKSTATIC}, Shared libraries: ${BT_LIB_MKPIC}, rpath: ${BT_FEATURE_RPATH}" # NOLINT
        _BT_LIBHOWTO_SUMMARY=done
    fi
}

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