Thanks Ian. If the classification of these parameters with respect to their influence on Optimization Objective(Compilation time/memory, Execution time, Code size) etc is provided, the user can fine tune their application further. Is there any list of Language specific and Architecture specific Runtime Parameter list? Thanks Sankar -- View this message in context: http://gcc.1065356.n5.nabble.com/Runtime-Parameters-in-GCC-tp885828p885882.html Sent from the gcc - Help mailing list archive at Nabble.com.