Uh oh, this doesn't sound good. --with-vendor-bug-url is one of few configure options that were recently switched to using a new utility function which automatically handles the unpleasant details of generating an autoconf flag (https://bugs.openjdk.org/browse/JDK-8296478), I'm worried that this is another issue with that utility that's somehow flown under the radar. I'll take a look at it when I can, but given how unpleasant the generated script often is, this might take a while. Thanks for raising this issue to us though :)
best regards, Julian
