The solaris build uses mapfiles to reorder object code in an attempt to improve performance. The mapfiles are checked in to the source and have not been updated, aside from simply deleting stale entries, in many years. Any performance benefits from the original work were small, and the mapfiles are now so out of date that the performance impact is unknown and possibly negative. The performance impact of reordering should be checked and the mapfiles either updated or removed from the build.