Select x32 run-time library for --with-abi={x32|mx32}

	PR target/53575
	* config.gcc: Select x32 run-time library if --with-abi={x32|mx32}
	is used for x86_64-*-*.

From-SVN: r188240

gcc/ChangeLog

+2012-06-05  H.J. Lu  <hongjiu.lu@intel.com>
+
+	PR target/53575
+	* config.gcc: Select x32 run-time library if --with-abi={x32|mx32}
+	is used for x86_64-*-*.
+
 2012-06-05  Richard Guenther  <rguenther@suse.de>
 
 	PR tree-optimization/30442

gcc/config.gcc

@@ -1299,7 +1299,14 @@ x86_64-*-linux* | x86_64-*-kfreebsd*-gnu | x86_64-*-knetbsd*-gnu)
 	tmake_file="${tmake_file} i386/t-linux64"
 	x86_multilibs="${with_multilib_list}"
 	if test "$x86_multilibs" = "default"; then
-		x86_multilibs="m64,m32"
+		case ${with_abi} in
+		x32 | mx32)
+			x86_multilibs="mx32"
+			;;
+		*)
+			x86_multilibs="m64,m32"
+			;;
+		esac
 	fi
 	x86_multilibs=`echo $x86_multilibs | sed -e 's/,/ /g'`
 	for x86_multilib in ${x86_multilibs}; do