RE: [openssl/openssl] bio_dgram vs IPv6

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> From: Michael Richardson <mcr@xxxxxxxxxxxx>
> Sent: Friday, 1 April, 2022 07:40
> 
> Michael Wojcik <Michael.Wojcik@xxxxxxxxxxxxxx> wrote:
>     > Actually, in the context of #if expressions, unrecognized tokens
> expand to 0 anyway:
> 
>     > After all replacements due to macro expansion and the defined unary
>     > operator have been performed, all remaining identifiers are replaced
>     > with the pp-number 0...
> 
>     > (ISO 9899:1999 6.10.1 #3)
> 
> Yes, but that generates a warning, and then error via -Werror with some
> set
> of compile options that at least one CI run uses.

Oh, well. An implementation is allowed to generate any diagnostics it wishes, and is allowed to fail to translate even a conforming program.

Ultimately we're at the mercy of the implementation, and GCC is not a particularly good C implementation. (Of course, in its default mode, it doesn't implement C; it implements a language similar to, but not, C.)




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