I said that GCC defines type punning via unions. It is an extension to the C sta... | Hacker News

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		ryao 9 months ago \| parent \| context \| favorite \| on: GCC 15.1 I said that GCC defines type punning via unions. It is an extension to the C standard that GCC did. That said, using “the code compiles in godbolt” as proof that it is not relying on what the standard specifies to be UB is fallacious.

uecker 9 months ago [–]

I am a member of the standards committee and a GCC maintainer. The C standard supports union punning. (You are right though that relying on godbolt examples can be misleading.)

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