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Viewing changes to m4/stack.m4

  • Committer: Brian Aker
  • Date: 2010-09-21 09:57:03 UTC
  • Revision ID: brian@tangent.org-20100921095703-622iopd89890rsky
This modifies our thread system to be based on boost, and it fixes a
critical bug where stack size was not being calculated correctly.

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m4/stack.m4
 
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AC_DEFUN([DRIZZLE_STACK_DIRECTION],[
 
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  AC_CACHE_CHECK(stack direction for C alloca, ac_cv_c_stack_direction,
 
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    [AC_RUN_IFELSE(
 
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       [AC_LANG_PROGRAM(
 
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          [[
 
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            #include <stdlib.h>
 
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 /* Prevent compiler optimization by HP's compiler, see bug#42213 */
 
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 #if defined(__HP_cc) || defined (__HP_aCC) || defined (__hpux)
 
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 #pragma noinline
 
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 #endif
 
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 int find_stack_direction ()
 
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 {
 
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   static char *addr = 0;
 
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   auto char dummy;
 
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   if (addr == 0)
 
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     {
 
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       addr = &dummy;
 
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       return find_stack_direction ();
 
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     }
 
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   else
 
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     return (&dummy > addr) ? 1 : -1;
 
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 }
 
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          ]],
 
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          [[
 
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   exit (find_stack_direction() < 0);
 
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          ]]
 
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       )],
 
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       [ac_cv_c_stack_direction=1],
 
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       [ac_cv_c_stack_direction=-1],
 
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       [ac_cv_c_stack_direction=]
 
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    )]
 
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  )
 
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 AC_DEFINE_UNQUOTED(STACK_DIRECTION, $ac_cv_c_stack_direction)
 
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])