Add Windows i18n support (#617)

runtime/src/main/cpp/Interop.cpp

@@ -46,7 +46,7 @@ ffi_type* convertFfiTypeKindToType(FfiTypeKind typeKind) {
         case FFI_TYPE_KIND_DOUBLE: return &ffi_type_double;
         case FFI_TYPE_KIND_POINTER: return &ffi_type_pointer;
 
-        default: assert(false);
+        default: assert(false); return nullptr;
     }
 }
 

runtime/src/main/cpp/Runtime.cpp

@@ -15,6 +15,9 @@
  */
 
 #include <stdio.h>
+#if KONAN_WINDOWS
+#include <windows.h>
+#endif
 
 #include "Memory.h"
 #include "Runtime.h"
@@ -64,6 +67,12 @@ RuntimeState* InitRuntime() {
   result->memoryState = InitMemory();
   // Keep global variables in state as well.
   InitGlobalVariables();
+#if KONAN_WINDOWS
+  // Note that this code enforces UTF-8 console output, so we may want to rethink
+  // how we perform console IO, if it turns out, that UTF-16 is better output format.
+  SetConsoleCP(CP_UTF8);
+  SetConsoleOutputCP(CP_UTF8);
+#endif
   return result;
 }