Security fixes are back; other fixes can go in. Time for build 18?

[Jonathan Gibbons]

Andrew John Hughes wrote:
>
>
> Finally, during build, I just spotted another issue.  The langtools
> build wrongly passes -Werror to javac and this has been removed in the
> OpenJDK7 version.  It only shows up if you build OpenJDK6 with
> OpenJDK7, so it's minor but probably worth fixing.  I doubt that is
> the only building-with-7 issue though.
>   

langtools is supposed to be warning free and thus is supposed to use 
-Werror.

-- Jon