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

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

[jakub at gcc dot gnu.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.

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

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65715
Bug 65715 depends on bug 65690, which changed state.

Bug 65690 Summary: [5 Regression] typedef alignment lost since r219705
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65690

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

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

[jakub at gcc dot gnu.org]

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

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |5.0

--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Tracking the rest from PR65690:
/* PR c++/65715 */
/* { dg-do run } */

typedef double T[4][4] __attribute__((aligned (2 * __alignof__ (double))));
void foo (const T);
struct S { T s; };

int
main ()
{
  if (__alignof__ (const T) != 2 * __alignof__ (double))
    __builtin_abort ();
  return 0;
}

#if defined(__cplusplus) && __cplusplus >= 201103L
static_assert (alignof (const T) == 2 * alignof (double), "alignment of const
T");
#endif

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

[rguenth at gcc dot gnu.org]

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

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2015-04-10
     Ever confirmed|0                           |1

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed.

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

[jakub at gcc dot gnu.org]

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

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Well, Jason has already committed the fix for this in PR65690.