I pushed these afterthought fixes to stdalign:
* m4/stdalign.m4 (gl_STDALIGN_H): Relax the _Alignof test,
as it was too strict: alignof must divide offsetof, but it need
not equal offsetof. Inspired by Joseph S. Myers's comment
<http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52023#c10>.
Conversely, tighten the _Alignas test a bit, as the resulting
alignment must be exactly 8.
diff --git a/m4/stdalign.m4 b/m4/stdalign.m4
index d78a589..6659c9c 100644
--- a/m4/stdalign.m4
+++ b/m4/stdalign.m4
@@ -25,15 +25,16 @@ AC_DEFUN([gl_STDALIGN_H],
#else
# define ao(type) offsetof (struct { char a; type b; }, b)
#endif
- char test1[_Alignof (double) == ao (double) ? 1 : -1];
- char test2[alignof (long int) == ao (long int) ? 1 : -1];
+ char test_double[ao (double) % _Alignof (double) == 0 ? 1 : -1];
+ char test_long[ao (long int) % _Alignof (long int) == 0 ? 1 : -1];
+ char test_alignof[alignof (double) == _Alignof (double) ? 1 : -1];
/* Test _Alignas only on platforms where gnulib can help. */
#if \
(__GNUC__ || __IBMC__ || __IBMCPP__ \
|| 0x5110 <= __SUNPRO_C || 1300 <= _MSC_VER)
int alignas (8) alignas_int = 1;
- char test3[8 <= _Alignof (alignas_int) ? 1 : -1];
+ char test_alignas[_Alignof (alignas_int) == 8 ? 1 : -1];
#endif
]])],
[gl_cv_header_working_stdalign_h=yes],
