Problem reported by Simon Josefsson in
<http://lists.gnu.org/archive/html/bug-gnulib/2011-12/msg00005.html>.
* doc/posix-headers/stdalign.texi (stdalign.h): Mention Clang 3.0,
which has <stdalign.h> but which does not define alignof.
* m4/stdalign.m4 (gl_STDALIGN_H): Check for Clang 3.0's problem.
I think these problems were reported by Bruno Haible, in email
that I've unfortunately misplaced.
* doc/posix-headers/stdalign.texi (stdalign.h): Document more
shortcomings of MSVC and of Sun C 5.11.
* lib/stdalign.in.h (_Alignas): Omit bogus extra parenthesis
around __declspec arg.
* modules/stdalign-tests (Files): Add tests/macros.h.
* tests/test-stdalign.c: Do not include <stdlib.h>; no longer needed.
Include macros.h, for ASSERT.
(DECLARE_ALIGNED): Remove.
(TEST_ALIGNMENT): Define to 16 if alignment is supported (more likely
to catch bug), and to 1 if not (simplifies the rest of the code).
(CHECK_STATIC): Always declare the alignment test vars; that's simpler.
(CHECK_AUTO): Remove.
(CHECK_ALIGNED): Check only the alignment of the static vars,
since auto var alignment isn't supported by Sun C 5.11.
(CHECK_TYPES): Remove. All uses replaced by inline code, so that
ASSERT failures are easier to diagnose.
