#!/bin/sh

DWARF2_SUPPORT=no
DWARF2_SUPPORT_BROKEN=no
COMPILER=$1
VERBOSE=$2
WORKDIR=$3

shift 3

LFLAGS=
CXXFLAGS=
while [ "$#" -gt 0 ]; do
    case $1 in
    -arch)
        CXXFLAGS="$CXXFLAGS -arch $2"
        shift
        ;;
    -sdk)
        CXXFLAGS="$CXXFLAGS -isysroot $2"
        LFLAGS="$LFLAGS -Wl,-syslibroot,$2"
        shift
        ;;
    *)  ;;
    esac
    shift
done

touch dwarf2.c

if "$COMPILER" -c dwarf2.c $CXXFLAGS -Werror -gdwarf-2 2>/dev/null 1>&2; then
    if "$COMPILER" -c dwarf2.c $CXXFLAGS -Werror -gdwarf-2  2>&1 | grep "unsupported" >/dev/null ; then
        true
    else
        DWARF2_SUPPORT=yes
    fi
fi
rm -f dwarf2.c dwarf2.o

# Test for xcode 2.4.0, which has a broken implementation of DWARF
"$COMPILER" $WORKDIR/xcodeversion.cpp $CXXFLAGS $LFLAGS -o xcodeversion -framework Carbon;
./xcodeversion

if [ "$?" == "1" ]; then
    DWARF2_SUPPORT_BROKEN=yes
fi

rm xcodeversion

# done
if [ "$DWARF2_SUPPORT" != "yes" ]; then
    [ "$VERBOSE" = "yes" ] && echo "DWARF2 debug symbols disabled."
    exit 0
else
    if [ "$DWARF2_SUPPORT_BROKEN" == "yes" ]; then
        [ "$VERBOSE" = "yes" ] && echo "DWARF2 debug symbols disabled."
        exit 0
    else
        [ "$VERBOSE" = "yes" ] && echo "DWARF2 debug symbols enabled."
        exit 1
    fi
fi