[Mesa-dev] Debugging into Mesa Driver

[Ian Romanick]

On 06/04/2014 09:46 PM, roshan chaudhari wrote:
> Thanks for reply.
> 
> I have added "CFLAGS='-Og -ggdb3' CXXFLAGS='-Og -ggdb3'" into configure
> file and ran 
> "./configure --enable-debug" ; make; make install
> 
> but still it did not step into driver.

Are you sure it's using the driver you built instead of the system
installed driver?

    LIBGL_DEBUG=verbose glxgears

will give some information about the driver being used (see below).  If
that doesn't match the driver installed, you'll need to use
LD_LIBRARY_PATH and possibly LIBGL_DRIVERS_PATH to get the right one.

libGL: OpenDriver: trying /usr/lib64/dri/tls/i965_dri.so
libGL: OpenDriver: trying /usr/lib64/dri/i965_dri.so
libGL: Can't open configuration file /home/idr/.drirc: No such file or directory.
libGL: Can't open configuration file /home/idr/.drirc: No such file or directory.

> On Wed, Jun 4, 2014 at 1:09 PM, Ian Romanick <idr at freedesktop.org
> <mailto:idr at freedesktop.org>> wrote:
> 
>     On 06/04/2014 11:14 AM, roshan chaudhari wrote:
>     > Hello,
>     >         I just cloned the mesa driver from git repository. I am trying
>     > to debug the opengl application with mesa driver. I am not sure which
>     > flag to enable for debugging and where, I built a driver with
>     > -enable-debug in Makefile and added --DEBUG in CFLAGS in Makefile but
>     > still when I try to step into driver code it does not allow me. I am
>     > doing it with gdb in ubuntu.
> 
>     Modifying the CFLAGS in the Makefile is likely to cause problems.
>     Instead, try
> 
>     CFLAGS='-Og -ggdb3' CXXFLAGS='-Og -ggdb3' ./configure --enable-debug
>     <your other configure options>
> 
>     If your version of GCC is too old, you will need to use -O0 instead
>     of -Og.
> 
>     That should be sufficient.  You can verify this by doing
> 
>         gdb $(which glxgears)
> 
>     Then, at the gdb prompt,
> 
>         break _mesa_Clear
> 
>     It will ask
> 
>         Function "_mesa_Clear" not defined.
>         Make breakpoint pending on future shared library load? (y or [n])
> 
>     Answer 'y'.  Then,
> 
>         run
> 
>     If it stops in _mesa_Clear, you're good to go.
> 
>     > Can anyone please help me with that?
>     >
>     > --
>     >
>     > Thanks,
>     > Roshan
>     >
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> 
>