Conditionally compile clang pragmas

projects/SelfTest/ConditionTests.cpp

@@ -5,7 +5,9 @@
  *  Distributed under the Boost Software License, Version 1.0. (See accompanying
  *  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
  */
+#ifdef __clang__
 #pragma clang diagnostic ignored "-Wpadded"
+#endif
 
 #include "catch.hpp"