Ensure that structs and unions in C are never empty. #611
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Empty structs and unions are a non-standard extension in C, and have a different layout between C and C++, so avoid emitting them. If a generated struct or union would have zero members, give it a `u8 __empty;` member so that it's not actually empty, so that it gets a consistent layout no matter how it's being compiled.
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Empty structs and unions are a non-standard extension in C, and have a different layout between C and C++, so avoid emitting them. If a generated struct or union would have zero members, give it a
u8 __empty;member so that it's not actually empty, so that it gets a consistent layout no matter how it's being compiled.