* force scanning of includes?
@ 2005-08-08 17:12 tom fogal
2005-08-08 20:57 ` Jason Molenda
0 siblings, 1 reply; 2+ messages in thread
From: tom fogal @ 2005-08-08 17:12 UTC (permalink / raw)
To: gdb
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
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: force scanning of includes?
2005-08-08 17:12 force scanning of includes? tom fogal
@ 2005-08-08 20:57 ` Jason Molenda
0 siblings, 0 replies; 2+ messages in thread
From: Jason Molenda @ 2005-08-08 20:57 UTC (permalink / raw)
To: tfogal; +Cc: gdb
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
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2005-08-08 17:12 force scanning of includes? tom fogal
2005-08-08 20:57 ` Jason Molenda
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