1
2# Check whether a Python module is available by name, and if it is,
3# define a variable in the internal cache.
4function(_find_python_module_internal module_name)
5  # Check for presence of the module.  Even though we don't use all the
6  # variable names set here, assigning them suppresses their output in CMake.
7  execute_process(COMMAND ${PYTHON_EXECUTABLE} -c "import ${module_name}"
8    RESULT_VARIABLE IMPORT_${module_name}_EXITCODE
9    OUTPUT_VARIABLE IMPORT_${module_name}_OUTPUT
10    ERROR_VARIABLE IMPORT_${module_name}_ERROR
11    )
12  if(${IMPORT_${module_name}_EXITCODE} EQUAL 0)
13    set(PYTHON_MODULE_${module_name}_FOUND TRUE PARENT_SCOPE)
14  else()
15    set(PYTHON_MODULE_${module_name}_FOUND FALSE PARENT_SCOPE)
16  endif()
17endfunction()
18
19# Function to simplify checking if a Python module is available
20function(find_python_module module_name result)
21  if(NOT PYTHON_MODULE_${module_name}_FOUND)
22    _find_python_module_internal(${module_name})
23  endif()
24  set(${result} ${PYTHON_MODULE_${module_name}_FOUND} PARENT_SCOPE)
25endfunction()
26