zahiraam added a comment.
MSVC and xmain compile this:
struct __declspec(uuid("00000000-0000-0000-C000-000000000046")) IUnknown {};
struct PageBase : public IUnknown {};
struct Page3 : public PageBase {};
struct Page4 : public PageBase {};
__interface PropertyPage : public Page4 {};
But MSVC doesn't compile this:
struct __declspec(uuid("00000000-0000-0000-C000-000000000046")) IUnknown {};
struct PageBase : public IUnknown {};
struct Page3 : public PageBase {};
struct Page4 : public PageBase {};
struct Page5 : public Page3, Page4{};
__interface PropertyPage : public Page5 {};
So a base of RD that has siblings and inherits from a Unknown is not permitted.
Which means that if the number is siblings are greater than one, we should
fail. I guess the current function doesn't take that into account.
https://reviews.llvm.org/D37308
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