__cxa_atexit and "FAIL: cxxtest run"

[Benjamin Kosnik]

> FWIW, this looks somewhat similar to PR libstdc++/23591:
> 
>   http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23591
> 
> It looks like libstdc++.so.6 was unloaded a bit too
> prematurely for the exit handlers and xdr_u_long_internal()
> is just a red herring for the real problem.

This particular bug is fixed in mainline. 

Your analysis still seems pretty hazy to me.

The only thing --enable-__cxa_atexit changes is order of init/destruction. 

-benjamin