How to solve gdb <value optimized out> problem?

[cazy <ad319min@xxxxxxxxx>]

I am trying debug gcc 4.5.0 use gdb on ubuntu
 
and encounter the problem by seeing "value optimized out".  as fellow:
 
(gdb) run -I /usr/include /cazy/add.c 
Starting program: /home/cazy/gcc-object/gcc/cc1 -I /usr/include /cazy/add.c
Breakpoint 4, c_parser_declaration_or_fndef (parser=0xb7f32bb4, 
    fndef_ok=1 '\001', empty_ok=1 '\001', nested=0 '\000', 
    start_attr_ok=1 '\001') at ../../project/gcc-4.5.0/gcc/c-parser.c:1170
1170 {
(gdb) next
1175   location_t here = c_parser_peek_token (parser)->location;
(gdb) next
1170 {
(gdb) p here
$5 = <value optimized out>

 
This creates a lot of problem for me to debuging 
So, I am wondering if there is anyway to solve the problem?
 
thanks
cazy
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