[PATCH v3] x32: Align sem_t to 8 bytes [BZ #33632]

[Adhemerval Zanella Netto]

On 19/11/25 08:10, Wilco Dijkstra wrote:
> Hi HJ,
> 
>>> That's an ABI break. Also I don't see how the behaviour of existing x32 binaries
>>> is unchanged - they use unaligned sem_t and thus reintroduce the bug.
>>
>> The current x32 binaires use 64-bit atomic operations on unaligned
>> 64-bit sem_t.   My patch doesn't change that.   It doesn't reintroduce
>> the bug.
> 
> But it doesn't fix it either and it introduces new ABI bugs...
> 
> If breaking the ABI was acceptable, it could have been done many years ago.

Do we really need to use 64 bit atomics on x32? I can't say about performance
implications, but taken that ILP32 architectures are not that wildly used
I don't think it should be a pressing issue.