Add Python check in cmake process to allow optional resource.dat creation.

cmake/FindPythonModule.cmake

@@ -0,0 +1,29 @@
+# Test for the existence of a specified Python Module
+#
+# From http://ompl.hg.sourceforge.net/hgweb/ompl/ompl/file/tip/CMakeModules/FindPython.cmake
+
+
+if(DEFINED PYTHON_EXECUTABLE)
+
+function(find_python_module module)
+	string(TOUPPER ${module} module_upper)
+	if(NOT PY_${module_upper})
+		if(ARGC GREATER 1 AND ARGV1 STREQUAL "REQUIRED")
+			set(${module}_FIND_REQUIRED TRUE)
+		endif()
+		# A module's location is usually a directory, but for binary modules
+		# it's a .so file.
+		execute_process(COMMAND "${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 _${module}_status)
+			set(PY_${module_upper} ${_${module}_location} CACHE STRING
+				"Location of Python module ${module}")
+		endif(NOT _${module}_status)
+	endif(NOT PY_${module_upper})
+	find_package_handle_standard_args(PY_${module} DEFAULT_MSG PY_${module_upper})
+endfunction(find_python_module)
+
+endif(DEFINED PYTHON_EXECUTABLE)