What sources are you working with? .debug_types and .debug_pubtypes were added to that list before version 0.144 (commit a14b4eb on 2009/10/5). Actual support for all version 4 formats is in version 0.148 (just recent). See http://elfutils.fedorahosted.org for pointers to the git repository. I'll add .gdb_index. Thanks, Roland