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AC_DEFUN([AX_PTRDIFF_ALIASES_INT], [
ax_saved_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS -Werror"
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$ax_cv_ptrdiff_aliases_int" = "xyes"], [
AC_DEFINE([PTRDIFF_ALIASES_INT], [1], [Whether ptrdiff_t aliases int])
])
CFLAGS="$ax_saved_CFLAGS"
])dnl
|
