Unfortunately, I don't know of any Developers that use GDB for that purpose. The built-in debugger should be able to accomplish all you need, I presume. No, you misunderstand; I'm using gdb to debug the emulator itself (the x86 binary) to track down bugs in the emulation. But I'm also using the bui...

When debugging problems with a machine (say SNES), I set various breakpoints in gdb (debugging mame.exe). Often, I'd like to also set a breakpoint for the emulated SNES depending on watchpoints I see in the gdb-debugged mame.exe, not by pressing "continue" in gdb and waiting for the intern...