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Re: Help needed with printing bug


From: Ben Abbott
Subject: Re: Help needed with printing bug
Date: Mon, 04 May 2015 10:10:49 -0400

> 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


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