#!/bin/sh

FVISIBILITY_SUPPORT=no

COMPILER=$1

VERBOSE=$2

CMDLINE=

RunCompileTest() {

    cat >>fvisibility.c << EOF

#if defined(__GNUC__)

#   if (__GNUC__ < 4)

#      error "GCC3 with backported visibility patch is known to miscompile Qt"

#   endif

__attribute((visibility("default"))) void blah();

#elif defined(__SUNPRO_CC)

#   if (__SUNPRO_CC < 0x0550)

#      error "SunStudio 8 or later is required for ELF visibility"

#   endif

__global void blah();

#else

#   error "GCC4+ or SunStudio 8+ are required to support ELF visibility"

#endif

EOF

    if [ "$VERBOSE" = "yes" ] ; then

        "$COMPILER" -c $CMDLINE fvisibility.c && FVISIBILITY_SUPPORT=yes

    else

        "$COMPILER" -c $CMDLINE fvisibility.c >/dev/null 2>&1 && FVISIBILITY_SUPPORT=yes

    fi

    rm -f fvisibility.c fvisibility.o

}

case "$COMPILER" in

*g++*|*c++*)

    CMDLINE="-fvisibility=hidden"

    RunCompileTest

   ;;

aCC*)

    ;;

icpc)

    ICPC_VERSION=`icpc -dumpversion`

    case "$ICPC_VERSION" in

    8.*|9.*|10.0)

        # 8.x, 9.x, and 10.0 don't support symbol visibility

        ;;

    *)

        # the compile test works for the intel compiler because it mimics gcc's behavior

        CMDLINE="-fvisibility=hidden"

        RunCompileTest

        ;;

    esac

    ;;

CC)

   # This should be SunStudio.  If not, it'll get caught.

   CMDLINE="-xldscope=hidden"

   RunCompileTest

   ;;

esac

# done

if [ "$FVISIBILITY_SUPPORT" != "yes" ]; then

    [ "$VERBOSE" = "yes" ] && echo "Symbol visibility control disabled."

    exit 0

else

    [ "$VERBOSE" = "yes" ] && echo "Symbol visibility control enabled."

    exit 1

fi