[CMake] CMake finds the wrong Python interpreter on Windows

[Noel O'Boyle]

On 25 February 2010 15:44, Bill Hoffman <bill.hoffman at kitware.com> wrote:
> Noel O'Boyle wrote:
>>
>> On 24 February 2010 22:20, Bill Hoffman <bill.hoffman at kitware.com> wrote:
>>>
>>> Noel O'Boyle wrote:
>>>>
>>>> Hello all,
>>>>
>>>> With the following CMakeLists.txt on Windows...
>>>>
>>>> project("MyProject" NONE)
>>>> find_package(PythonInterp)
>>>> find_package(PythonLibs)
>>>>
>>>> Using CMake 2.6.4 (or CMake 2.8), I get
>>>>
>>>> -- Found PythonInterp: C:/Cygwin/bin/python2.5.exe
>>>> -- Found PythonLibs: C:/Python26/libs/python26.lib
>>>>
>>>> instead of
>>>>
>>>> -- Found PythonInterp: C:/Python26/python.exe
>>>> -- Found PythonLibs: C:/Python26/libs/python26.lib
>>>>
>>>> This is a Windows XP machine, with standard installs of Python 2.5 and
>>>> 2.6 and a standard Cygwin install of Python 2.5, where my PATH
>>>> includes C:\Python26 before C:\Cygwin\bin. Why doesn't CMake just use
>>>> the Python interpreter on my path as a first appoximation?
>>>>
>>> It should use the one in your PATH...   What is your PATH set to? Might
>>> be
>>> something in the PATH that confuses CMake...   I have seen issues with "
>>> in
>>> the PATH.
>>
>> No ", but lots of spaces...my path is as follows:
>>
>> C:\Tools\OpenBabel\nightly\ob-build>echo %PATH%
>> C:\Program Files\ImageMagick-6.5.8-Q16;;C:\Program Files\MiKTeX
>> 2.8\miktex\bin;C
>> :\Python26\Lib\site-packages\PyQt4;C:\Program Files\CollabNet\Subversion
>> Client;
>> C:\windows\system32;C:\windows;C:\windows\system32\WBEM;C:\Program
>> Files\QuickTi
>> me\QTSystem\;C:\Program Files\Common Files\Roxio
>> Shared\DLLShared\;C:\Program Fi
>> les\Common Files\Roxio Shared\DLLShared\;C:\Program Files\Common
>> Files\Roxio Sha
>> red\9.0\DLLShared\;C:\Program Files\TortoiseSVN\bin;C:\Program
>> Files\Support Too
>> ls\;C:\Program Files\OpenBabel-2.2.3;C:\Program
>> Files\OpenBabel-2.2.1;C:\Python2
>> 6;C:\Program
>> Files\GaussSumexe-2.1.4\GaussSum-2.1.4\gnuplot400\bin;C:\Program Fi
>> les\CMake 2.6\bin;C:\Program
>> Files\GnuWin32\bin;C:\Tools\swig\swigwin-1.3.40;C:\
>> Program Files\CollabNet\Subversion Client;C:\Cygwin\bin;C:\Data\DrugBank
>>
>> The first python found on the PATH is my regular Windows Python as
>> shown by the following:
>>
>
> Nothing jumps out...
>
> Can you try in a shell setting the PATH to:
>
> PATH=C:\Python26
>
> Then run CMake, and see what it does?

Good question. It works:
-- Found PythonInterp: C:/Python26/python.exe
-- Found PythonLibs: C:/Python26/libs/python26.lib

However, if I set the PATH to C:\Python26;C:\Cygwin\bin, the original
problem reappears. (It's also there if I have
PATH=C:\Cygwin\bin;C:\Python26.)

(Sorry for duplication - meant to Reply All)

> -Bill
>