Magnus:
We are validating that the topdir we're using when running make is the same as when we were running configure.For some circumstances, most typically when using a subdirectory in the user's home directory (e.g. ~/jdk10) on Cygwin, this check fails. Bug: https://bugs.openjdk.java.net/browse/JDK-8189955 WebRev: http://cr.openjdk.java.net/~ihse/JDK-8189955-configuration-validation-is-broken-for-some-paths/webrev.01
Looks good. Tim