C++, can't see debug info for some classes

["Vyacheslav V. Yurkov" <uvv.mail@gmail.com>]

Hi,
We use several static libraries in our project as our run-time.
To add debug info for a class X I just do:
g++ X.cpp -I../include -c -g -Wall -o X.o
ar rsu ../lib1.a X.o
That worked OK with any class from our library but at the moment
I have some issues with class X. I can't see its members in a debugger gdb.
gdb says that class X is <incomplete type>.
I tried to do 'ptype X' in gdb and got the following:
No symbol "X" in current context.
I looked into it more, did objdump for X.o file and saw that
there is no address near the symbol which looks like my class X.

I tried 3 different versions of g++ (4.3.x, 4.4.x, 4.5.x), tried 
following parameters for gcc: -g3, -g2 -O0, -ggdb, -gstubs+. But nothing 
helped.
My class X also doesn't use anonymous unions.

Does anyone have an idea what is wrong with g++ or with my class X?
Thanks in advance.

-- 
Yours sincerely,
Vyacheslav V. Yurkov