[CMake] Finding Python3

[Branan Purvine-Riley]

On Sunday 18 July 2010 12:07:43 you wrote:
> On Sunday 18 July 2010 09:15:17 Michael Hertling wrote:
> > On 07/18/2010 06:50 AM, Branan Riley wrote:
> > > I've mad a very cursory effort to add Python 3 support to CMake. All
> > > I've done so far is take FindPythonLibs and FindPythonInterp, and
> > > change the variable names and the python versions. It doesn't yet have
> > > framework support on Mac, as I have no idea how to specify a Python 3
> > > framework. Besides that, the code should probably be adjusted so it's
> > > not duplicated across two modules - a FindPythonLibsCommon.cmake file
> > > or something that does all the "hard" work.
> > > 
> > > I'm making this available now so people can play with it and give
> > > feedback. I'll clean up the code and get another message out when I
> > > think it's in a state it can actually be merged into the main CMake
> > > git tree.
> > > 
> > > For now, my work is in a clone on github at
> > > http://github.com/branan/CMake/tree/python3 . You can add my work as a
> > > tracking branch to a checkout of the main CMake git tree with the
> > > following commands:
> > > 
> > > git remote add -t python3 branan git://github.com/branan/CMake.git
> > > git fetch branan
> > > git checkout -b python3 branan/python3

I've pushed to my repo (and attached here) a FindPython.cmake that first 
locates a python 2 or 3 interpreter, then finds the library/header information 
from that interpreter. It uses distutils to get the include and library path 
names. I'm not sure my library implementation is the best way to do it - I 
didn't see a shortcut function in distutils, but I may have missed something 
somewhere.

I still need to add some sort of PYTHON_ROOT variable for custom builds of 
python that are in a weird place, a fallback library search when cross-
compilng, and COMPONENTS support.

Some sort of wrapper around FIND_PROGRAM to make it more robust might be 
useful if a clear set of requirements can be written - it seems everyone who's 
chimed in on that debate has different ideas of what's broken and what should 
be fixed, so for now I'm just going to leave it like it is. It's still a good 
improvement over the previous FindPython* modules.

--Branan
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