Frama-C API - Warning_manager
 Handle Frama-C warnings in the GUI.
val make : packing:(GObj.widget -> unit) -> callback:(Frama_c_kernel.Log.event -> GTree.view_column -> unit) -> tBuild a new widget for storing the warnings.
val append : t -> Frama_c_kernel.Log.event -> unitAppend a new message warning.
val clear : t -> unitClear all the stored warnings.
