JDK-8298448 added the capability to configure to use UBSan, via the `--enable-ubsan` configuration option. However, the default behavior for UBSan is to exit when a problem is detected, so the first reported warning stops the build.

This behavior can be overridden by setting an environment variable: `UBSAN_OPTIONS=halt_on_error=0`. It would be nice if this could be done at configuration time.