[Insight-developers] Languishing Gerrit Top For SystemPNG

[Williams, Norman K]

Look at the FindPNG.cmake for your installed CMake on that machine -- does
it set PNG_INCLUDE_DIRS anywhere? That's what my patch changed.


The only way this should work is if png.h lives in your default include
search path -- /usr/include /usr/local/include etc.  On my main machine
(OS X) it's in /usr/X11R6/include for some "APPLE THINKS DIFFERENT" reason.


On 6/10/11 1:56 PM, "Bill Lorensen" <bill.lorensen at gmail.com> wrote:

>OK, without your patch, I just built against a libpng 1.2.44. No
>problems... I did not run into the cmake issue you mentioned.
>
>
>On Fri, Jun 10, 2011 at 2:53 PM, Bill Lorensen <bill.lorensen at gmail.com>
>wrote:
>> Kent,
>>
>> As long as we're running a tab, I'll try to use the system libpng on
>> my Fedora 12 system.
>>
>> Bill
>>
>> On Fri, Jun 10, 2011 at 12:16 PM, Williams, Norman K
>> <norman-k-williams at uiowa.edu> wrote:
>>> See: http://review.source.kitware.com/#change,1758
>>>
>>>
>>> This patch does two things:
>>>
>>> 1. There's a typo in Modules/ThirdParty/PNG/CMakeLists.txt that means
>>> USE_SYSTEM_PNG was 100% broken -- PNG_INCLUDE_DIRS is used instead of
>>> PNG_INCLUDE_DIR, which is what the PNG CMake module defines.
>>>
>>> 2. ITK's version is quite old -- there's an API change that needs to be
>>>   accomodated, and in the latest revision, PNG makes its data
>>>structures
>>>   private, and access to structure members goes through access
>>>functions.
>>>
>>> I did this work a week ago and Bill Lorensen was the only person to
>>>review
>>> the patch. He pointed out that there's no test added for the patch,
>>>but I
>>> don't know how you'd write a test for USE_SYSTEM_<LIB>.
>>>
>>> I would like to merge this patch. Can someone else have a look?
>>>
>>> The other alternative is to remove USE_SYSTEM_PNG as an option, and
>>>always
>>> use the ITK-internal version.
>>>
>>>
>>>
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