blob: 32e1712aa0e1871d854f6fc807645bdf916886c8 (
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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>
@%:@include <assert.h>
]], [[
ptrdiff_t x = 23;
_Static_assert(_Generic(&x, int* : 1, default : 0),
"ptrdiff_t* does not alias int*");
]])],
[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
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