[Bug c++/65715] New: Aligned attribute C++ issues

["jakub at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65715

            Bug ID: 65715
           Summary: Aligned attribute C++ issues
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Keywords: wrong-code
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: jakub at gcc dot gnu.org
                CC: hubicka at gcc dot gnu.org, jason at gcc dot gnu.org
        Depends on: 65690

+++ This bug was initially created as a clone of Bug #65690 +++

typedef double T[4][4] __attribute__((aligned (16)));
void foo (const T);
struct S { T s; };

int
main ()
{
  if (__alignof__ (struct S) < 16 || __alignof__ (T) < 16)
    __builtin_abort ();
  return 0;
}

(distilled from WebKit) fails with C++ starting with r219705 (but keeps working
with C).  Without the const T in the argument list of foo (or with just T in
there) it works.