http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56755
--- Comment #3 from bryan <dungtq1387 at gmail dot com> 2013-03-29 02:32:20 UTC --- let me provide more details about this bug. I got all of my program's function names from compiler and wanted to demangle them. C++filt successfully demangled almost all of the names, except for the ones started with _GLOBAL. One example is the one I posted above. > c++filt _GLOBAL__sub_I__ZN4AMOS12ContigEdge_t5NCODEE _GLOBAL__sub_I__ZN4AMOS12ContigEdge_t5NCODEE