[CMake] cmake vs. Python 3.4

[Rolf Eike Beer]

Am Freitag, 23. Dezember 2016, 20:57:49 schrieb Lev:
> Hi list,
> 
> 
> I have this:
> 
> FIND_PACKAGE(PythonInterp)
> 
> and cmake finds this:
> 
> -- Found PythonInterp: /usr/bin/python (found version "2.7.9")
> 
> However, 3.4 is also installed. How can I specify to find 3.4?
> 
> If I say:
> 
> set(Python_ADDITIONAL_VERSIONS 3.4)
> FIND_PACKAGE(PythonInterp 3 REQUIRED)

The problem here is the "REQUIRED". Older CMake versions did not let "3.4" 
satisfy "3" as required version, what newer versions do. However they let it 
pass as a minimum version. And you don't need to add 3.4 to the list of 
supported versions, if I read the log correct then 3.4 is already in the list 
for CMake 3.0.

Eike, having done most of this version detection stuff
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