"How do I get debugging to work on my System V Release 4 system?"
Most systems based on System V Release 4 (except Solaris) encode symbolic debugging information in a format known as `DWARF'.
Although the GNU C compiler already knows how to write out symbolic debugging information in the DWARF format, the GNU C++ compiler does not yet have this feature, nor is it likely to in the immediate future.
Ron Guilmette has done a great deal of work to try to get the GNU C++ compiler to produce DWARF format symbolic debugging information (for C++ code) but he gave up on the project because of a lack of funding and/or interest from the g++ user community. If you have a strong desire to see this project completed, contact Ron at <rfg@netcom.com>.
In the meantime, you can get g++ debugging under SVR4 systems by
configuring gcc with the --with-stabs option. This causes gcc to
use an alternate debugging format, one more like that used under SunOS4.
You won't need to do anything special to GDB; it will always understand
the "stabs" format.