Re: Help needed with printing bug

[Ben Abbott]

> On May 4, 2015, at 9:40 AM, John W. Eaton <address@hidden> wrote:
> 
> I need help fixing this bug:
> 
>  https://savannah.gnu.org/bugs/?44916
> 
> I am unable to duplicate the problem, but have narrowed it down somewhat.  
> The issue seems to be that when gl2ps gathers the info it needs to draw the 
> plot from OpenGL, some of the data points are not correct.  Apparently 
> printing worked in 3.8.2 but fails now.  I tried undoing all the changes to 
> the gl2ps rendering code that have been made since 3.8.2 but am told that did 
> not solve the problem.
> 
> I thought perhaps we had changed the options for gl2ps or OpenGL in some way 
> that triggered the bug.  But now I'm just clueless about what the problem 
> could be, other than a driver issue, especially since the problem seems to 
> appear on some systems but not others.
> 
> Maybe someone else has a better plan, but the only thing I can think of now 
> to debug this is to bisect and try to determine which changeset introduced 
> the problem.  But that will be a somewhat painful process as I'm unable to 
> test whether a given changeset is good or bad myself.
> 
> So, first I need someone who can duplicate the error and who is willing to 
> run a simple test for me.  We would do something like
> 
>  1. I build a binary
>  2. You download and test it and report the result
>  3. I bisect and go to 1 until we find the bad changeset
> 
> Given that there have been thousands of changes committed between 3.8.x and 
> now, I guess this could take 12 iterations or so.
> 
> jwe

I have a windows box which I can experiment with. I don’t know if it will 
exhibit the bug, but I can try.

Ben