-gstabs gives better C++ COFF debugging

If you use the GCC option `-gstabs', GCC embeds extended debugging information in COFF object files. (The extended debug information is based on the stabs debugging format, which was originally used only with the a.out object file format; see The stabs debug format, in your sources as `src/gdb/doc/stabs.texinfo', or contact Cygnus for more information.) With this additional debugging information, you can debug C++ programs with GDB, even on systems that use COFF.

You can get better C++ debugging by compiling with `-gstabs' for these targets:

a29k-amd-udi         m68k-coff 
h8300-hms            m88k-coff 
z8k-coff             sh-hms