Re: [PATCH 0/3] MR6502: include: Fix MIDL_INTERFACE definition.

[Jacek Caban (＠jacek)]

Jacek Caban (@jacek) commented about include/rpcndr.h:
> typedef void (__RPC_USER *NDR_NOTIFY_ROUTINE)(void);
>  typedef void (__RPC_USER *NDR_NOTIFY2_ROUTINE)(boolean flag);
>
> -#define DECLSPEC_UUID(x)
> +#ifndef DECLSPEC_UUID
> +# if defined(_MSC_VER) && (_MSC_VER >= 1100) && defined (__cplusplus)

It's also supported on mingw targets when `-fms-extensions` is used. I think that using `__has_declspec_attribute` would be more portable and precise. Unfortunately, it's not supported on the actual MSVC, but maybe it's worth having something like:
```
#ifndef __has_declspec_attribute
# #ifdef _MSC_VER
#  define __has_declspec_attribute(x) 1
# else
#  define __has_declspec_attribute(x) 0
# endif
#endif
```