CMake: use a custom message when Python is not found
When Python is not found, inform developers how they can use a newer version. Even though it's not officially supported - we typically keep the latest stable version of Python working.
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@ -31,7 +31,8 @@ IF(NOT PYTHON_ROOT_DIR AND NOT $ENV{PYTHON_ROOT_DIR} STREQUAL "")
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SET(PYTHON_ROOT_DIR $ENV{PYTHON_ROOT_DIR})
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ENDIF()
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SET(PYTHON_VERSION 3.10 CACHE STRING "Python Version (major and minor only)")
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SET(_PYTHON_VERSION_SUPPORTED 3.10)
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SET(PYTHON_VERSION ${_PYTHON_VERSION_SUPPORTED} CACHE STRING "Python Version (major and minor only)")
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MARK_AS_ADVANCED(PYTHON_VERSION)
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@ -178,7 +179,23 @@ UNSET(_IS_LIB_PATH_DEF)
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# handle the QUIETLY and REQUIRED arguments and SET PYTHONLIBSUNIX_FOUND to TRUE IF
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# all listed variables are TRUE
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INCLUDE(FindPackageHandleStandardArgs)
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FIND_PACKAGE_HANDLE_STANDARD_ARGS(PythonLibsUnix DEFAULT_MSG
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FIND_PACKAGE_HANDLE_STANDARD_ARGS(PythonLibsUnix
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# NOTE(@ideasman42): Instead of `DEFAULT_MSG` use a custom message because users
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# may have newer versions Python and not be using pre-compiled libraries
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# (on other UNIX systems or using an esoteric architecture).
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# Some Python developers might want to use the newer features of Python too.
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# While we could automatically detect and use newer versions but this would result in
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# developers using a configuration which isn't officially supported without realizing it.
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# So warn that the officially supported Python version is not found and let the developer
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# explicitly set the newer version if they wish.
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# From a maintenance perspective it's typically not a problem to support newer versions,
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# doing so can help ease the process of upgrading too, nevertheless these versions don't
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# have the same level of testing & support.
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"\
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'PYTHON_VERSION=${_PYTHON_VERSION_SUPPORTED}' not found! \
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This is the only officially supported version. \
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If you wish to use a newer Python version you may set 'PYTHON_VERSION' \
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however we do not guarantee full compatibility in this case."
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PYTHON_LIBRARY PYTHON_LIBPATH PYTHON_INCLUDE_DIR PYTHON_INCLUDE_CONFIG_DIR)
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IF(PYTHONLIBSUNIX_FOUND)
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@ -215,6 +232,7 @@ IF(PYTHONLIBSUNIX_FOUND)
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ENDIF()
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UNSET(_PYTHON_ABI_FLAGS)
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UNSET(_PYTHON_VERSION_SUPPORTED)
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UNSET(_python_SEARCH_DIRS)
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MARK_AS_ADVANCED(
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