Robbin Ehn made me aware that the jlink command in the JDK build runs more than 50% slower if the build is configured with --with-native-debug-symbols=internal.

On my machine, this means a link time of 7-8 seconds instead of ~5. With a slowdebug build (as Robbin was experimenting with) the result is even more markedly, going from 19 seconds to 36.

I have a hard time understanding that the additional debug data should have this kind of performance impact, and suspect there is some kind of bug underlying this.