While building a version of gcc with gcj re-added, it fails on "gengtype: failed to compute output name for ../.././gcc/java/lang.c". Looking into the source code, it says this error "Should not be possible, and could only happen if the files_rules is incomplete or buggy". Presumably, the files_rules is missing something relating to java. Where is files_rules and how would I add the required java references to it?
