patch-configure

--- configure.orig	2009-02-11 02:43:40.000000000 +0100
+++ configure	2013-10-18 16:28:11.000000000 +0200
@@ -15904,6 +15904,7 @@
 
 
 case "$CXX" in
+	clang*) ;;
 		cl*|CL*)
 		CXXFLAGS="-nologo -W1 -EHsc -DWIN32"
 		if test x"$enable_shared" = "xyes"; then
@@ -19744,7 +19745,7 @@
 
 OPT_CFLAGS=""
 case "$CXX" in
-   g++*)
+   nomatch)
 		TRY_CFLAGS="$OPT_CFLAGS -g"
 		{ $as_echo "$as_me:$LINENO: checking if $CXX supports $TRY_CFLAGS $CXXFLAGS flags" >&5
 $as_echo_n "checking if $CXX supports $TRY_CFLAGS $CXXFLAGS flags... " >&6; }
@@ -20147,7 +20148,7 @@
 	{ $as_echo "$as_me:$LINENO: result: yes" >&5
 $as_echo "yes" >&6; }
 	case "$CXX" in
-	    g++*)
+	    g++*|c++*|clang*)
 			CXXFLAGS=`echo $CXXFLAGS | sed 's/-O[0-9]*//g'`
 			OPT_CFLAGS=""
 			TRY_CFLAGS="-O0"
@@ -20237,7 +20238,7 @@
 $as_echo "no" >&6; }
 	OPT_CFLAGS=""
 	case "$CXX" in
-    g++*|icc)
+    nomatch)
 		TRY_CFLAGS="-O3"
 		{ $as_echo "$as_me:$LINENO: checking if $CXX supports $TRY_CFLAGS $CXXFLAGS flags" >&5
 $as_echo_n "checking if $CXX supports $TRY_CFLAGS $CXXFLAGS flags... " >&6; }
@@ -20416,7 +20417,7 @@
 
     #Try more optimising flags if supported
 	case "$CXX" in
-	    g++*)
+	    nomatch)
 									TRY_CFLAGS="$OPT_CFLAGS -fexpensive-optimizations"
 			{ $as_echo "$as_me:$LINENO: checking if $CXX supports $TRY_CFLAGS $CXXFLAGS flags" >&5
 $as_echo_n "checking if $CXX supports $TRY_CFLAGS $CXXFLAGS flags... " >&6; }
@@ -20941,7 +20942,7 @@
 
 if test x"${enable_mmx}" = x"yes" ; then
 	case "$CXX" in
-	    g++*)
+	    g++*|c++*|clang*)
 			ac_ext=cpp
 ac_cpp='$CXXCPP $CPPFLAGS'
 ac_compile='$CXX -c $CXXFLAGS $CPPFLAGS conftest.$ac_ext >&5'