Added compile-time checking for the size of enums to SDL_types.h

--HG--
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%40464

include/SDL_types.h

@@ -84,6 +84,17 @@ SDL_COMPILE_TIME_ASSERT(sint32, sizeof(Sint32) == 4);
 SDL_COMPILE_TIME_ASSERT(uint64, sizeof(Uint64) == 8);
 SDL_COMPILE_TIME_ASSERT(sint64, sizeof(Sint64) == 8);
 
+/* Check to make sure enums are the size of ints, for structure packing.
+   For both Watcom C/C++ and Borland C/C++ the compiler option that makes
+   enums having the size of an int must be enabled.
+   This is "-b" for Borland C/C++ and "-ei" for Watcom C/C++ (v11).
+*/
+typedef enum {
+	DUMMY_ENUM_VALUE
+} SDL_DUMMY_ENUM;
+
+SDL_COMPILE_TIME_ASSERT(enum, sizeof(SDL_DUMMY_ENUM) == sizeof(int));
+
 #undef SDL_COMPILE_TIME_ASSERT
 
 /* General keyboard/mouse state definitions */