[PATCH] c++/58109 - alignas() fails to compile with constant expression

[Martin Sebor]

> Right.  The problem is this code in is_late_template_attribute:
>
>>       /* If the first attribute argument is an identifier, only consider
>>          second and following arguments.  Attributes like mode, format,
>>          cleanup and several target specific attributes aren't late
>>          just because they have an IDENTIFIER_NODE as first argument.  */
>>       if (arg == args && identifier_p (t))
>>         continue;
>
> It shouldn't skip an initial identifier if !attribute_takes_identifier_p.

That seems backwards. I expected attribute_takes_identifier_p()
to return true for attribute aligned since the attribute does
take one.

In any case, I changed the patch as you suggest and retested it
on x86_64.  I saw the email about stage 3 having ended but I'm
not sure it applies to changes that are still in progress.

Martin
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