force scanning of includes?

force scanning of includes?

[tom fogal]

This is probably in the docs somewhere, but my greps are coming up
empty. sorry.

I'm trying to debug a C++ program, and gdb doesn't seem to know about
objects defined in a library. The library is built with -g and
installed in /usr/local/lib/vtk, which is listed in /etc/ld.so.conf.
The headers are in /usr/local/include/vtk.

When I try to print an instance of an object from the library, gdb
thinks it is a struct:

#10 0x000000000040825c in main (argc=1, argv=0x7fffffffe748) at test.cxx:60
60              Renderer->Delete();
(gdb) print Renderer
$1 = (struct vtkRenderer *) 0x52d5b0
(gdb) print *Renderer
$2 = <incomplete type>

How can I tell gdb to scan /usr/local/include/vtk/vtkRenderer.h, so it
will know what a vtkRenderer is? The 'directories' command doesn't seem
to be much use here.

I've tried compiling my test.cxx program with '-g' and later '-gdwarf-2
-g3' after reading through some archives.

Thanks,

-tom

Re: force scanning of includes?

[Jason Molenda]

On Aug 8, 2005, at 10:12 AM, tom fogal wrote:

> When I try to print an instance of an object from the library, gdb
> thinks it is a struct:
>
> #10 0x000000000040825c in main (argc=1, argv=0x7fffffffe748) at  
> test.cxx:60
> 60              Renderer->Delete();
> (gdb) print Renderer
> $1 = (struct vtkRenderer *) 0x52d5b0
> (gdb) print *Renderer
> $2 = <incomplete type>

gdb doesn't know what a vtkRenderer is.  This class is probably  
defined in vtkRenderer.h.  Is the definition actually included there?

If so, then either your debug info is incomplete/incorrect, or gdb is  
failing in reading it.

> I've tried compiling my test.cxx program with '-g' and later '- 
> gdwarf-2
> -g3' after reading through some archives.

-gdwarf-2 is enough.  It looks like you're on a 64-bit host -- best  
off not messing with anything but DWARF 2.

I don't know of any problems like this with DWARF debug info, but I'm  
not too familiar with non-MacOS systems these days.  If you'd like to  
pursue this problem further, start by running readelf -wi  on your  
application and looking for the definition of vtkRenderer.

Jason