Re: g++, I'm not able to produce debug info for some classes

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

On 26.01.2011 18:17, Ian Lance Taylor wrote:
> "Vyacheslav V. Yurkov"<uvv.mail@gmail.com>  writes:
>
>    
> > 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?
> >      
> I think you are asking a gdb question, not a gcc question.  You may want
> to ask on a gdb mailing list.  See http://sourceware.org/gdb/ .
>    
Just did. I just thought that it is more g++ related issue.
> I don't fully grasp your comment about objdump.  A type like class X
> would not have an address.  The objdump program does not dump debugging
> information.
>    
It does, objdump with -g option displays debug information from object file.
> Note that in general you need to have a variable of type X before gdb
> can tell you anything about it.
>
> Ian
>    
Actually I have one, but I don't need to.
Gdb must be able to display class members without a variable of this class.

--
Yours sincerely,
Vyacheslav V. Yurkov