The extensions made to GDB to support Modula-2 only support output from the GNU Modula-2 compiler (which is currently being developed). Other Modula-2 compilers are not currently supported, and attempting to debug executables produced by them is most likely to give an error as GDB reads in the executable's symbol table.
| M2 Operators | Built-in operators |
| Built-In Func/Proc | Built-in functions and procedures |
| M2 Constants | Modula-2 constants |
| M2 Defaults | Default settings for Modula-2 |
| Deviations | Deviations from standard Modula-2 |
| M2 Checks | Modula-2 type and range checks |
| M2 Scope | The scope operators `::' and `.' |
| GDB/M2 | GDB and Modula-2 |