[CMake] FindX11 vs. Lion

[Randolph M. Fritz]

On 2012-08-18 01:11:57 +0000, Clifford Yapp said:

> On Fri, Aug 17, 2012 at 8:52 PM, Randolph M. Fritz 
> <RFritz at lbl.gov> wrote:
> 
>> Meantime, what would it take to get some Apple-specific support added to
>> FindX11.cmake?  If I did a version with some changes, would Kitware be
>> interested in picking it up?  It seems to me that I'm not the only one
>> having problems.
> 
> Not sure who's maintaining FindX11.cmake at Kitware - they may be
> looking for a maintainer.  If your changes can be under the same
> license as CMake itself you could post patches - I suspect a number of
> people besides BRL-CAD customize FindX11.cmake and would be
> interested.

What strikes me about FindX11.cmake is the way the script will grab 
multiple X11 library files from anywhere, with no assurance that the 
files will be compatible.  Since each find_path and find_library is an 
independent command we get the behavior I observed, where files are 
selected from random locations without regard to compatiblity.  Hence, 
a copy of Radiance built on my system without my FindX11 changes will 
not run anywhere else and may not even run on my system.

I ended up writing code which specified /usr/X11 with NO_DEFAULT_PATH 
to get the behavior shut off.  I suspect similar code which specified 
/usr/X11 and /usr/X11R6 would work for the Apple/XQuartz X server on 
every version of Mac OS.  Personally, I would prefer that the code use 
the native server unless an alternative was specified.

What problems did your solutions address?  I've skimmed them, but am 
not sure I understand them.  I'd also be interested in hearing from 
anyone else who has done this, and even people who have done it on 
Windows systems.

-- 
Randolph M. Fritz • RFritz at lbl.gov
Environmental Energy Technologies Division • Lawrence Berkeley Labs