Re: Help needed with printing bug

[Ben Abbott]

> On May 4, 2015, at 10:10 AM, Ben Abbott <address@hidden> wrote:
> 
> 
>> On May 4, 2015, at 10:03 AM, Ben Abbott <address@hidden> wrote:
>> 
>>> 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
> 
> I see that the windows binary for rc4 is available at alpha.gnu.org. I’m 
> downloading now.
> 
> Ben

Sorry, I won’t be any help. It tried both the qt and fltk toolkits and the  
plots produced by rc4 on my windows box all look ok.

Ben