Added Win32 UNICODE wmain support (#903)

* Added wmain support
* Added appveyor.yml wmain configuration
* Added wmain configuration flag to CMake

include/catch_session.hpp

@@ -166,6 +166,32 @@ namespace Catch {
             return returnCode;
         }
 
+    #if defined(WIN32) && defined(UNICODE)
+        int run( int argc, wchar_t const* const* const argv ) {
+
+            char **utf8Argv = new char *[ argc ];
+
+            for ( int i = 0; i < argc; ++i ) {
+                int bufSize = WideCharToMultiByte( CP_UTF8, 0, argv[i], -1, NULL, 0, NULL, NULL );
+
+                utf8Argv[ i ] = new char[ bufSize ];
+
+                WideCharToMultiByte( CP_UTF8, 0, argv[i], -1, utf8Argv[i], bufSize, NULL, NULL );
+            }
+
+            int returnCode = applyCommandLine( argc, utf8Argv );
+            if( returnCode == 0 )
+                returnCode = run();
+
+            for ( int i = 0; i < argc; ++i )
+                delete [] utf8Argv[ i ];
+
+            delete [] utf8Argv;
+
+            return returnCode;
+        }
+    #endif
+
         int run() {
             if( m_configData.showHelp )
                 return 0;

include/internal/catch_default_main.hpp

@@ -10,8 +10,14 @@
 
 #ifndef __OBJC__
 
+#if defined(WIN32) && defined(_UNICODE) && !defined(DO_NOT_USE_WMAIN)
+// Standard C/C++ Win32 Unicode wmain entry point
+extern "C" int wmain (int argc, wchar_t * argv[], wchar_t * []) {
+#else
 // Standard C/C++ main entry point
 int main (int argc, char * argv[]) {
+#endif
+
 	int result = Catch::Session().run( argc, argv );
     return ( result < 0xff ? result : 0xff );
 }