PythonDeps.cmake

# Helper. Statically linked python needs some deps, and the FindPython.cmake script does not set those
MACRO(FIND_PYTHON_DEPS _LIBS_TO_ADD)
    # SET(${_LIBS_TO_ADD})

    FIND_PACKAGE(PythonInterp REQUIRED)

    # Execute the one-liner to get the python deps
    IF(PYTHONINTERP_FOUND)
	EXEC_PROGRAM(${PYTHON_EXECUTABLE} ARGS "-c 'from distutils.sysconfig import get_config_var; print(get_config_var(\"LIBS\") + \" \" + get_config_var(\"SYSLIBS\"))'"
        OUTPUT_VARIABLE PYDEPS
        RETURN_VALUE PYRET
    )

    # The return value should be Zero, otherwise, an error is indicated
    IF(NOT PYRET)
        # Ok, execution went fine
        # Remove the -l parts, and do other small changes needed as well...
        SET(_LIBNAMES)

        STRING(REGEX REPLACE "-l" "" _LIBNAMES "${PYDEPS}")
        STRING(REGEX REPLACE "[\n\r]" " " _LIBNAMES "${_LIBNAMES}")
        STRING(REGEX REPLACE "  " " " _LIBNAMES "${_LIBNAMES}")
        STRING(REGEX REPLACE " " ";" _LIBNAMES "${_LIBNAMES}")

        # Now. For each of the listed libs, try to find it using FIND_LIBRARY (pthread -> /usr/lib/libpthread.so, etc)
        FOREACH(_LIB ${_LIBNAMES})
        # As the CMake caches things, it is important to have a different name for each lib path, otherwise
        # the FIND_LIBRARY won't search

        # Var Name will contain the lib name
        SET(_VARNAME "_LIB_${_LIB}")

        SET(${_VARNAME})

        # Find it, concantenate the result list
        FIND_LIBRARY(${_VARNAME} ${_LIB} PATHS /usr/lib /lib)

        IF(${_VARNAME})
            # Semicolon is the THING. It took me a while to find this out...
            SET(${_LIBS_TO_ADD} "${${_LIBS_TO_ADD}};${${_VARNAME}}")
        ELSE(${_VARNAME})
            MESSAGE(FATAL_ERROR "Python static linking dependency ${_LIB} not found!")
        ENDIF(${_VARNAME})

        # SET(${_VARNAME})
        MARK_AS_ADVANCED(${_VARNAME})

        ENDFOREACH(_LIB)

        # Done...
    ELSE(NOT PYRET)
        MESSAGE(FATAL_ERROR "Python static linking dependencies could not be evaluated - return value non-zero")
    ENDIF(NOT PYRET)

    ELSE(PYTHONINTERP_FOUND)
    MESSAGE(FATAL_ERROR "Python interpreter not found, but needed to determine static linking dependencies")
    ENDIF(PYTHONINTERP_FOUND)
ENDMACRO(FIND_PYTHON_DEPS _LIBS_TO_ADD)