Add support for C-style enums in C mode. And tests.

In backward compatible mode C style enums binding are correctly
generated

Examples/test-suite/lua/enums_runme.lua

@@ -19,4 +19,12 @@ assert(enums.globalinstance3==30)
 assert(enums.AnonEnum1==0)
 assert(enums.AnonEnum2==100)
 
+-- In C enums from struct are exported without prefixing with struct name
+-- In C++ they are prefixed.
+-- We are emulating xor :)
+assert(enums.BAR1 ~= enums.Foo_BAR1) -- It is either C style, or C++ style, but not both
+assert((enums.BAR1 ~= nil ) or (enums.Foo_BAR1 ~= nil))
+
+assert(enums.Phoo ~= enums.iFoo_Phoo)
+assert((enums.Phoo == 50) or (enums.iFoo_Phoo == 50))
 -- no point in checking fns, C will allow any value

Source/Modules/lua.cxx

@@ -139,6 +139,7 @@ private:
     STATIC_FUNC,
     STATIC_VAR,
     STATIC_CONST,		// enums and things like static const int x = 5;
+    ENUM_CONST, // This is only needed for backward compatibility in C mode
 
     STATES_COUNT
   };
@@ -1010,8 +1011,16 @@ public:
     bool make_v2_compatible = v2_compatibility && getCurrentClass() != 0;
 
     if (make_v2_compatible) {
-      target_name_v2 = Swig_name_member(0, class_symname, target_name);
-      iname_v2 = Swig_name_member(0, class_symname, iname);
+      // Special handling for enums in C mode - they are not prefixed with structure name
+      if(!CPlusPlus && current[ENUM_CONST]) {
+	target_name_v2 = target_name;
+	DohIncref(target_name_v2);
+	iname_v2 = iname;
+	DohIncref(iname_v2);
+      } else {
+	target_name_v2 = Swig_name_member(0, class_symname, target_name);
+	iname_v2 = Swig_name_member(0, class_symname, iname);
+      }
       n_v2 = Copy(n);
       //Printf( stdout, "target name v2: %s, symname v2 %s\n", target_name_v2.ptr(), iname_v2.ptr());// TODO:REMOVE
       if (!luaAddSymbol(iname_v2, n, class_parent_nspace)) {
@@ -1074,8 +1083,10 @@ public:
 
   virtual int enumDeclaration(Node *n) {
     current[STATIC_CONST] = true;
+    current[ENUM_CONST] = true;
     int result = Language::enumDeclaration(n);
     current[STATIC_CONST] = false;
+    current[ENUM_CONST] = false;
     return result;
   }