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