Java programs segfault on exit

[Andrew Haley]

At the present time, gcj (x86 Linux) on the trunk is not working.
Every Java programs crashes at exit.  This is because the routine
gnu.gcj.runtime.FileDeleter.deleteOnExitNow() is being miscompiled at
-O2.

This will cause gcj tests to fail or hang.

I guess this is an optimizer bug rather than specifically a gcj bug,
but I can't be sure until I've found it.  I'm working on this problem
at the moment and I'll post more information as soon as I know, but it
won't be before tomorrow.

In the meantime, if anyone needs to get a gcj that works, please
recompile gnu/gcj/runtime/FileDeleter at -O0.

Thanks to Marcus Daniels for the heads up.

Andrew.