In this commit:
> 2009-05-08 Bruno Haible <br...@clisp.org>
>
> New module 'alignof'.
> * lib/alignof.h: New file.
> * modules/alignof: New file.
> * lib/malloca.h: Include alignof.h.
> (sa_alignof): Remove macro.
> (sa_alignment_*): Use the alignof macro.
> * modules/malloca (Depends-on): Add alignof.
the special cases for AIX cc,xlc and HP-UX cc are not right in general.
They are only right in the context of malloca.h.
I've reverted the malloca related part of that commit and applied this fix:
2009-05-12 Bruno Haible <br...@clisp.org>
Fix alignof macro.
* lib/alignof.h (alignof): Remove special cases for AIX and HP-UX
vendor compilers that are always correct.
*** lib/alignof.h.orig 2009-05-13 03:20:03.000000000 +0200
--- lib/alignof.h 2009-05-13 03:18:00.000000000 +0200
***************
*** 26,39 ****
#elif defined __cplusplus
template <class type> struct alignof_helper { char __slot1; type __slot2; };
# define alignof(type) offsetof (alignof_helper<type>, __slot2)
- #elif defined __hpux
- /* Work around a HP-UX 10.20 cc bug with enums constants defined as offsetof
- values. */
- # define alignof(type) (sizeof (type) <= 4 ? 4 : 8)
- #elif defined _AIX
- /* Work around an AIX 3.2.5 xlc bug with enums constants defined as offsetof
- values. */
- # define alignof(type) (sizeof (type) <= 4 ? 4 : 8)
#else
# define alignof(type) offsetof (struct { char __slot1; type __slot2; },
__slot2)
#endif
--- 26,31 ----
