GC_LOG_OPTS customisation is currently supported but (pre Java 9) the customised settings are supplemented e.g. https://github.com/apache/lucene-solr/blob/releases/lucene-solr/6.6.0/solr/bin/solr#L1713
This seems unexpected and confusing. Some ideas for making it less confusing:
- a new GC_LOG_FILE_OPTS option
- the new option can be customised but if unset it would default to existing behaviour
- use customised GC_LOG_OPTS 'as is'
- this would be a change to existing behaviour i.e. the solr#L1713 settings mentioned above would no longer be appended