+2012-01-27 Paul Eggert <eggert@cs.ucla.edu>
+
+ stdalign: check that alignof and offsetof are consistent
+ * m4/stdalign.m4 (gl_STDALIGN_H): Check for GCC bug 52023.
+ Problem reported for gnulib by Richard W.M. Jones in
+ <http://lists.gnu.org/archive/html/bug-gnulib/2012-01/msg00340.html>.
+
2012-01-27 Jim Meyering <meyering@redhat.com>
update-copyright: accept new option: UPDATE_COPYRIGHT_USE_INTERVALS=2
[AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM(
[[#include <stdalign.h>
- int align_int = alignof (int) + _Alignof (double);
+ #include <stddef.h>
+
+ /* Test that alignof yields a result consistent with offsetof.
+ This catches GCC bug 51316
+ <http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51316>. */
+ #ifdef __cplusplus
+ template <class t> struct alignof_helper { char a; t b; };
+ # define ao(type) offsetof (alignof_helper<type>, b)
+ #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];
/* 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];
#endif
]])],
[gl_cv_header_working_stdalign_h=yes],