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  • Committer: Monty Taylor
  • Date: 2009-12-25 08:50:15 UTC
  • mto: This revision was merged to the branch mainline in revision 1255.
  • Revision ID: mordred@inaugust.com-20091225085015-83sux5qsvy312gew
MEM_ROOT == memory::Root

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m4/stack.m4
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# Copyright (C) 2010 Brian Aker
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#
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# This file is free software
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# gives unlimited permission to copy and/or distribute it,
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# with or without modifications, as long as this notice is preserved.
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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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])