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    mod dladdr;

    use sys::backtrace::BacktraceContext;
    use sys_common::backtrace::Frame;
    use io;

    #[cfg(target_os = "emscripten")]
    pub use self::dladdr::resolve_symname;

    #[cfg(target_os = "emscripten")]
    pub fn foreach_symbol_fileline<F>(_: Frame, _: F, _: &BacktraceContext) -> io::Result<bool>
    where
        F: FnMut(&[u8], u32) -> io::Result<()>
    {
        Ok(false)
    }

    #[cfg(not(target_os = "emscripten"))]
    pub use sys_common::gnu::libbacktrace::foreach_symbol_fileline;

    #[cfg(not(target_os = "emscripten"))]
    pub fn resolve_symname<F>(frame: Frame, callback: F, bc: &BacktraceContext) -> io::Result<()>
    where
        F: FnOnce(Option<&str>) -> io::Result<()>
    {
        ::sys_common::gnu::libbacktrace::resolve_symname(frame, |symname| {
            if symname.is_some() {
                callback(symname)
            } else {
                dladdr::resolve_symname(frame, callback, bc)
            }
        }, bc)
    }

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