Re: struct sockaddr_storage

[Alex Colomar <alx.manpages@gmail.com>]

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Hi Jakub,

On 1/23/23 17:37, Jakub Jelinek wrote:
> Please see transparent_union documentation in GCC documentation.
> E.g. https://gcc.gnu.org/onlinedocs/gcc-12.2.0/gcc/Common-Type-Attributes.html#index-transparent_005funion-type-attribute
> transparent_union doesn't change anything regarding type punning, it is
> solely about function arguments, how arguments of that type are passed
> (as first union member) and that no casts to the union are needed from
> the member types.

Yep, when I wrote that I didn't fully understand it.  Now I got it. 
I'll prepare some better suggestion about a fix.

Thanks.

> And, with LTO TU boundaries are lost, inlining or other IPA optimizations
> (including say modref) work in between TUs.

Yeah, that's why we need a fix.  Compilers will only get better at 
optimizing, so UB will sooner or later be a problem.

Cheers,

Alex

-- 
<http://www.alejandro-colomar.es/>


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