Visual Studio < 2013 does not have __func__

Author: saper

debug.hpp

@@ -38,6 +38,11 @@ namespace Sass {
   };
 }
 
+// Visual Studio 2012 does not have __func__
+#if _MSC_VER < 1800 
+#define __func__ __FUNCTION__
+#endif
+
 #define TRACE() \
   if (logTRACE > Sass::LibsassLogReportingLevel) ; \
   else Sass::Log().Get(Sass::logTRACE, __func__, __FILE__, __LINE__)