I just tried to compile Suse Linux package ctags-2006.5.31-3 with GNU C++ version 4.2 snapshot 20060826.
The compiler said ruby.c: In function 'parseIdentifier': ruby.c:227: error: edge from 49 to 51 should not be marked irreducible ruby.c:227: error: basic block 51 should not be marked irreducible ruby.c:227: error: edge from 51 to 37 should not be marked irreducible ruby.c:227: internal compiler error: in verify_loop_structure, at cfgloop.c:1268 Please submit a full bug report, with preprocessed source if appropriate. See <URL:http://gcc.gnu.org/bugs.html> for instructions. Preprocessed source code attached. Flag -O3 required. -- Summary: -O3 crash Product: gcc Version: 4.2.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: dcb314 at hotmail dot com GCC host triplet: i686-suse-linux http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28936