Re: [ompl-users] CMake error - Could not find Python

[David B. <dbr...@st...>]

On 2/26/2011 8:35 PM, Mark Moll wrote:
> On Feb 25, 2011, at 1:37 PM, David Breeden wrote:
>> I'm trying to install OMPL on my 64-bit Windows 7 machine.  I've installed all the dependencies but when I hit Configure in the CMake GUI I get:
>>
>> CMake Error at C:/Program Files (x86)/CMake 2.8/share/cmake-2.8/Modules/FindPackageHandleStandardArgs.cmake:91 (MESSAGE):
>>     Could NOT find Python (missing: PYTHON_LIBRARIES)
>> Call Stack (most recent call first):
>>    C:/Program Files (x86)/CMake 2.8/share/cmake-2.8/Modules/FindPackageHandleStandardArgs.cmake:252 (_FPHSA_FAILURE_MESSAGE)
>>    ompl/CMakeModules/FindPython.cmake:115 (find_package_handle_standard_args)
>>    CMakeLists.txt:32 (find_package)
>>
>>
>> Configuring incomplete, errors occurred!
>>
>> The CMake window shows the right values for PYTHON_EXEC and PYTHON_INCLUDE_DIRS (C:/Python27/python.exe and C:/Python27/include, respectively).
>>
>> I'm guessing this is something simple but I don't have a lot of experience with CMake or Python.
>
> The python executable and python header files are apparently not the problem, but cmake can’t find the python libraries. Can you tell me if there is a *.lib or *.dll file somewhere in C:/Python27 or one of its subdirectories

Yes, there are libraries in C:/Python27/libs and C:/Python27/DLLs.

I think I found the issue.  In FindPython.cmake the pertinent line is:

find_library(PYTHON_LIBRARIES "python${PYTHON_VERSION}"
     PATHS
         "${PYTHON_PREFIX}/lib"
         
[HKEY_LOCAL_MACHINE\\SOFTWARE\\Python\\PythonCore\\${PYTHON_VERSION}\\InstallPath]/libs
     PATH_SUFFIXES "" "python${PYTHON_VERSION}/config"
     DOC "Python libraries" NO_DEFAULT_PATH)

${PythonVersion} is "2.7", though, and the library is python27.lib.  I 
hack around this by replacing the library name "python${PYTHON_VERSION}" 
with "python27" and CMake finds the library.    Should a different 
variable be used here instead of PYTHON_VERSION?

OK, so now I'm getting the following error:

CMake Error at C:/Program Files (x86)/CMake 
2.8/share/cmake-2.8/Modules/FindPackageHandleStandardArgs.cmake:91 
(MESSAGE):
   Could NOT find PY_PyQt4 (missing: PY_PYQT4)

Call Stack (most recent call first):
   C:/Program Files (x86)/CMake 
2.8/share/cmake-2.8/Modules/FindPackageHandleStandardArgs.cmake:252 
(_FPHSA_FAILURE_MESSAGE)
   ompl/CMakeModules/FindPython.cmake:95 (find_package_handle_standard_args)
   CMakeLists.txt:33 (find_python_module)


I see in the top-level OMPL directory CMakeLists.txt has 
"find_package(PyQt4 REQUIRED)" but I installed PySide instead of PyQt4.  
I tried replacing this line with "find_package(PySide REQUIRED)" but 
this produced the same error.

I'm going to try installing PyQt4 instead, but is there something else I 
could do to use PySide instead of PyQt4?

Thanks,
David