diff options
Diffstat (limited to 'm4')
| -rw-r--r-- | m4/ax_ptrdiff_aliases_int.m4 | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/m4/ax_ptrdiff_aliases_int.m4 b/m4/ax_ptrdiff_aliases_int.m4 new file mode 100644 index 0000000..f7175cd --- /dev/null +++ b/m4/ax_ptrdiff_aliases_int.m4 @@ -0,0 +1,16 @@ + +AC_DEFUN([AX_PTRDIFF_ALIASES_INT], [ + AC_CACHE_CHECK([whether ptrdiff_t aliases int], [ax_cv_ptrdiff_aliases_int], [ + AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[ + @%:@include <stddef.h> + ]], [[ + int a = 23; + ptrdiff_t *b = &a; + ]])], + [ax_cv_ptrdiff_aliases_int=yes], + [ax_cv_ptrdiff_aliases_int=no]) + ]) + AS_IF([test "x$ax_cv_ptrdiff_aliases_int" = "xyes"], [ + AC_DEFINE([PTRDIFF_ALIASES_INT], [1], [Whether ptrdiff_t aliases int]) + ]) +])dnl |