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dnl Copyright (C) 2009 Sun Microsystems
dnl This file is free software; Sun Microsystems
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.
#--------------------------------------------------------------------
# Check what direction the stack runs in
#--------------------------------------------------------------------
AC_DEFUN([PANDORA_STACK_DIRECTION],[
AC_REQUIRE([AC_FUNC_ALLOCA])
AC_CACHE_CHECK([stack direction], [ac_cv_c_stack_direction],[
AC_RUN_IFELSE([AC_LANG_PROGRAM([[
#include <stdlib.h>
int find_stack_direction ()
{
static char *addr = 0;
auto char dummy;
if (addr == 0)
{
addr = &dummy;
return find_stack_direction ();
}
else
return (&dummy > addr) ? 1 : -1;
}
]],[[
exit (find_stack_direction() < 0);
]])],[
ac_cv_c_stack_direction=1
],[
ac_cv_c_stack_direction=-1
])
])
AC_DEFINE_UNQUOTED(STACK_DIRECTION, $ac_cv_c_stack_direction)
])
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