Some debugging information for AIX contains the storage class suffix because it is not stripped by strip_name_encoding. See libgfortran/io/transfer.c for example.
-- Summary: storage class in debugging strings Product: gcc Version: 4.0.0 Status: UNCONFIRMED Keywords: wrong-debug Severity: normal Priority: P1 Component: target AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: dje at gcc dot gnu dot org CC: gcc-bugs at gcc dot gnu dot org GCC build triplet: *-*-* GCC host triplet: *-*-* GCC target triplet: powerpc-ibm-aix http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18994