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# FindPythonModule.cmake: find a specific Python module.
#
# The source here is Mark Moll from a post on the CMake mailing list:
# https://cmake.org/pipermail/cmake/2011-January/041666.html
#
# It has been modified to also check a minimum version if given.
function(find_python_module module)
string(TOUPPER ${module} module_upper)
if (NOT PY_${module_upper})
if (ARGC GREATER 1 AND ARGV1 STREQUAL "REQUIRED")
set(${module}_FIND_REQUIRED TRUE)
if (ARGC GREATER 2)
set(VERSION_REQ ${ARGV2})
endif ()
else ()
if (ARGC GREATER 1)
# Not required but we have version constraints.
set(VERSION_REQ ${ARGV1})
endif ()
endif ()
# A module's location is usually a directory, but for binary modules
# it's a .so file.
execute_process(COMMAND "${PYTHON_EXECUTABLE}" "-c"
"import re, ${module}; print(re.compile('/__init__.py.*').sub('',${module}.__file__))"
RESULT_VARIABLE _${module}_status
OUTPUT_VARIABLE _${module}_location
ERROR_QUIET OUTPUT_STRIP_TRAILING_WHITESPACE)
if (NOT _${module}_status)
# Now we have to check the version.
if (VERSION_REQ)
execute_process(COMMAND "${PYTHON_EXECUTABLE}" "-c"
"import ${module}; from distutils.version import StrictVersion; print(StrictVersion(${module}.__version__) >= StrictVersion('${VERSION_REQ}'));"
RESULT_VARIABLE _version_status
OUTPUT_VARIABLE _version_compare
OUTPUT_STRIP_TRAILING_WHITESPACE)
if ("${_version_compare}" STREQUAL "True")
set(PY_${module_upper} ${_${module}_location} CACHE STRING
"Location of Python module ${module}")
else ()
if (${module_upper}_FIND_REQUIRED)
message(FATAL_ERROR "Could not find suitable version >= ${VERSION_REQ} of Python module ${module}!")
else ()
message(WARNING "Unsuitable version of Python module ${module} (${VERSION_REQ} or greater required).")
endif ()
endif ()
else ()
# No version requirement so we are done.
set(PY_${module_upper} ${_${module}_location} CACHE STRING
"Location of Python module ${module}")
endif ()
endif ()
endif ()
find_package_handle_standard_args(PY_${module} DEFAULT_MSG PY_${module_upper})
if (NOT PY_${module_upper}_FOUND AND ${module_upper}_FIND_REQUIRED)
message(FATAL_ERROR "Could not find Python module ${module}!")
endif ()
endfunction ()
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