NGWS SDK Documentation  

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Compiler Warning (level 1) C4912

'attribute': attribute has undefined behavior on a nested UDT

Attributes that apply to nested UDTs (user-defined type, which could be a typedef, union, or struct) may be ignored.

The following code shows how this warning would be generated:

// compile with cl /c
[emitidl, module(name="xx")];

struct IUnknown {};
[custom, uuid("00000000-0000-0000-0000-000000000002")]
__interface IMy { };

[coclass, appobject, uuid("00000000-0000-0000-0000-000000000001")]
class CMy : public IMy
{
   [export, v1_enum] typedef enum myEnum { k3_1 = 1, k3_2 = 2 } myEnumv;
};