Debugging G++

[Alexander]

Hello!
      Yesterday I built gcc4.1.0 under cygwin and installed it. All
      gcc parts including cc1plus.exe, g++.exe and gcc.exe are
      compiled with debug information.
      Now I wish to debug cc1plus - i.e. debug G++ when it compiles my
      program. Can I do it with gdb? Please, tell me how?

Regards, Alexander.