debugging with gdb

[bergnoli@pd.infn.it (antonio)]

I'totally new in ada95 and i try to debug a simple program written in
ada95 (i.e hello world).I have compiled with gnatmake(-g option)and i
get an executable that   i ran into gdb.It works but i can't see the
original source using the gdb command 'list' and (obviously) i can't
put any break point where i want like i usually do when i work in C.
why?
tank you in advance.

Antonio