[Bug c++/88362] attribute aligned silently ignored on C++ references

[joseph at codesourcery dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88362

--- Comment #4 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
It's not very clear to me what an aligned attribute on a reference, or a 
check of the alignment of a reference, should mean anyway.

Note that in some places, [[]]-style attributes appertain to different 
syntactic constructs than __attribute__ appertains in the same place (and 
in any case, what [[]] appertains to is more precisely defined, whereas 
what __attribute__ appertains to is what keeps compatibility with existing 
code).

C++ alignas can be applied to references, but I don't see anything in 
[dcl.align] to clarify what it means there - does it align the referenced 
type (so that it's only valid to bind the reference to an object that 
itself is sufficiently aligned), or something else?