ENH: make the list of modules global

Alex

Modules/FindPythonLibs.cmake

@@ -85,6 +85,14 @@ SET(PYTHON_DEBUG_LIBRARIES "${PYTHON_DEBUG_LIBRARY}")
 INCLUDE(FindPackageHandleStandardArgs)
 FIND_PACKAGE_HANDLE_STANDARD_ARGS(PythonLibs PYTHON_LIBRARIES PYTHON_INCLUDE_PATH)
 
+
+GET_TARGET_PROPERTIES(_FIND_PYTHONLIBS_ALREADY_INCLUDED __FindPythonLibsHelper TYPE)
+IF(NOT _FIND_PYTHONLIBS_ALREADY_INCLUDED)
+  ADD_CUSTOM_TARGET(__FindPythonLibsHelper)  # so if this file is included several times the next time GET_TARGET_PROPERTIES() will work
+  SET(PY_STATIC_MODULES_LIST "" CACHE STRING "Collect a list of all added static python modules" FORCE)
+  SET(PY_MODULES_LIST        "" CACHE STRING "Collect a list of all added python modules" FORCE)
+ENDIF(NOT _FIND_PYTHONLIBS_ALREADY_INCLUDED)
+
 MACRO(PYTHON_ADD_MODULE _NAME )
   OPTION(PYTHON_ENABLE_MODULE_${_NAME} "Add module ${_NAME}" TRUE)
 
@@ -94,10 +102,10 @@ MACRO(PYTHON_ADD_MODULE _NAME )
       SET(PY_MODULE_TYPE MODULE)
     ELSE(PYTHON_MODULE_${_NAME}_SHARED)
       SET(PY_MODULE_TYPE STATIC)
-      SET(PY_STATIC_MODULES_LIST  ${PY_STATIC_MODULES_LIST} ${_NAME})
+      SET(PY_STATIC_MODULES_LIST  ${PY_STATIC_MODULES_LIST} ${_NAME} CACHE STRING "Collect a list of all added static python modules" FORCE)
     ENDIF(PYTHON_MODULE_${_NAME}_SHARED)
 
-    SET(PY_MODULES_LIST  ${PY_MODULES_LIST} ${_NAME})
+    SET(PY_MODULES_LIST  ${PY_MODULES_LIST} ${_NAME} CACHE STRING "Collect a list of all added python modules" FORCE)
     ADD_LIBRARY(${_NAME} ${PY_MODULE_TYPE} ${ARGN})
 #    TARGET_LINK_LIBRARIES(${_NAME} ${PYTHON_LIBRARIES})
   ENDIF(PYTHON_ENABLE_MODULE_${_NAME})