[Bug c++/124254] [13/14/15/16 Regression] Accepts invalid standalone alignas declaration since r12-2607

[jakub at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=124254

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jakub at gcc dot gnu.org
            Summary|[13/14/15/16 Regression]    |[13/14/15/16 Regression]
                   |Accepts invalid standalone  |Accepts invalid standalone
                   |alignas declaration         |alignas declaration since
                   |                            |r12-2607
           Keywords|needs-bisection             |

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Started with my r12-2607-g77ab4e3be2d92b1ff671d58418d852195f10dd20
We emit a warning by default though, isn't that still standard conformant?

Note, for
void foo ()
{
  alignas (long);
}
we've been emitting a warning since r0-119371-ge28d52cffbb2abc7a5764e when
alignas support has been added.