gcc, strict-aliasing, and casting through a union

Question

Do you have any horror stories to tell? The GCC Manual recently added a warning regarding -fstrict-aliasing and casting a pointer through a union:

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Answer 1

I don't really understand your problem. The compiler did exactly what it was supposed to do in your example. The union conversion is what you did in f1. In f2 it's a normal pointer typecast, that you casted it to a union is irrelevant, it's still a pointer casting