← Back to branch summary

~drizzle-trunk/drizzle/development

« back to all changes in this revision

Viewing changes to m4/stack.m4

  • Committer: Olaf van der Spek
  • Date: 2011-02-12 18:24:24 UTC
  • mto: (2167.1.2 build) (2172.1.4 build)
  • mto: This revision was merged to the branch mainline in revision 2168.
  • Revision ID: olafvdspek@gmail.com-20110212182424-kgnm9osi7qo97at2
casts

Show diffs side-by-side

added added

removed removed

Lines of Context:
m4/stack.m4
 
1
# Copyright (C) 2010 Brian Aker
 
2
#
 
3
# This file is free software
 
4
# gives unlimited permission to copy and/or distribute it,
 
5
# with or without modifications, as long as this notice is preserved.
 
6
 
 
7
AC_DEFUN([DRIZZLE_STACK_DIRECTION],[
 
8
  AC_CACHE_CHECK(stack direction for C alloca, ac_cv_c_stack_direction,
 
9
    [AC_RUN_IFELSE(
 
10
       [AC_LANG_PROGRAM(
 
11
          [[
 
12
            #include <stdlib.h>
 
13
 
 
14
 /* Prevent compiler optimization by HP's compiler, see bug#42213 */
 
15
 #if defined(__HP_cc) || defined (__HP_aCC) || defined (__hpux)
 
16
 #pragma noinline
 
17
 #endif
 
18
 
 
19
 int find_stack_direction ()
 
20
 {
 
21
   static char *addr = 0;
 
22
   auto char dummy;
 
23
   if (addr == 0)
 
24
     {
 
25
       addr = &dummy;
 
26
       return find_stack_direction ();
 
27
     }
 
28
   else
 
29
     return (&dummy > addr) ? 1 : -1;
 
30
 }
 
31
          ]],
 
32
          [[
 
33
   exit (find_stack_direction() < 0);
 
34
          ]]
 
35
       )],
 
36
       [ac_cv_c_stack_direction=1],
 
37
       [ac_cv_c_stack_direction=-1],
 
38
       [ac_cv_c_stack_direction=]
 
39
    )]
 
40
  )
 
41
 AC_DEFINE_UNQUOTED(STACK_DIRECTION, $ac_cv_c_stack_direction)
 
42
])