On 09/16/2010 05:15 PM, Jason Grout wrote:
> On 9/16/10 10:00 PM, Eric Firing wrote:
>> On 09/16/2010 04:12 PM, Jason Grout wrote:
>>> On 9/16/10 9:03 PM, Jason Grout wrote:
>>>> On 9/16/10 8:00 PM, Eric Firing wrote:
>>>>
>>>>>>> I tested your patch with Ubuntu 10.10, and it failed. The problem is
>>>>>>> that something is including setjmp.h before libpng.h tries to do so via
>>>>>>> pngconf.h, resulting in an error as the compiler trips over the
>>>>>>> following:
>>>>>>
>>>>>
>>>>> Python.h includes pyfpe.h which includes setjmp.h.
>>>>>
>>>>> Eric
>>>>>
>>>>
>>>> Ah, good catch.  So we just need to include Python.h first, and then set
>>>> that extra #def so that libpng doesn't try to include it?
>>>>
>>>> #include "Python.h"
>>>> #def PNG_SKIP_SETJMP_CHECK
>>>> #include<png.h>
>>>>
>>>
>>> Let me try again:
>>>
>>> In _backend_agg.cpp and _png.cpp, just add
>>>
>>> #define PNG_SKIP_SETJMP_CHECK
>>>
>>> right above
>>>
>>> #include<png.h>
>>>
>>> Does that fix it?
>>
>> Sure does.  Your patch with that modification is committed to branch and
>> trunk, 8706, 8707.  Thank you!
>>
>
> Did someone check on Windows?  I was hoping things wouldn't break in
> WrapPython.h when I switched the order of includes, but you never know...

Jason,

Big trouble, even without Windows.  First, after doing more reading, I 
am far from sure that skipping the check is OK.  Second, it doesn't work 
on earlier Linux versions, for which pngconf.h lacks that SKIP variable 
entirely.

What a pain.  I see that Andrew Straw ran into this wall a couple years ago.

Time to revert and re-think.  It may be that your patch is almost OK, 
but will need a tweak for Linux.

Eric

>
> Jason
>
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