Updating for 1.0.2 release
[awesomized/libmemcached] / m4 / pandora_stack_direction.m4
1 dnl Copyright (C) 2009 Sun Microsystems
2 dnl This file is free software; Sun Microsystems
3 dnl gives unlimited permission to copy and/or distribute it,
4 dnl with or without modifications, as long as this notice is preserved.
5
6 #--------------------------------------------------------------------
7 # Check what direction the stack runs in
8 #--------------------------------------------------------------------
9
10 AC_DEFUN([PANDORA_STACK_DIRECTION],[
11 AC_REQUIRE([AC_FUNC_ALLOCA])
12 AC_CACHE_CHECK([stack direction], [ac_cv_c_stack_direction],[
13 AC_RUN_IFELSE([AC_LANG_PROGRAM([[
14 #include <stdlib.h>
15 int find_stack_direction ()
16 {
17 static char *addr = 0;
18 auto char dummy;
19 if (addr == 0)
20 {
21 addr = &dummy;
22 return find_stack_direction ();
23 }
24 else
25 return (&dummy > addr) ? 1 : -1;
26 }
27 ]],[[
28 exit (find_stack_direction() < 0);
29 ]])],[
30 ac_cv_c_stack_direction=1
31 ],[
32 ac_cv_c_stack_direction=-1
33 ])
34 ])
35 AC_DEFINE_UNQUOTED(STACK_DIRECTION, $ac_cv_c_stack_direction)
36 ])
37
38
39