When building the jdk one of the final steps is to compare what you have built (the build/*/j2sdk-image directory) with what can be found in the previous release. For better or worse, this logic required access to the previous jdk and jre install bundles so it could install these in a temporary area to do the comparison. Not having access to these bundles would cause these make rules to fail.
People running into this have usually set SKIP_COMPARE_IMAGES=false.

The proposal is to use the boot jdk image for comparison if the bundles are not available.

The comparison itself never fails, e.g. even if the actual comparison say severe differences it would never trigger a build error, that's a different issue not to be addressed here. First step is to see if we can't always find an image to compare against.
Posted Date : 2008-09-09 18:49:37.0

N/A

See description.
Posted Date : 2008-09-09 19:31:13.0

http://hg.openjdk.java.net/jdk7/build/jdk/rev/a23b7f4f8b3c
Posted Date : 2008-09-12 02:32:59.0