Hi all: I am trying to use "-dv" flag in the GCC. For each of the other indicated dump files (either with -d or -fdump-rtl-pass), it dumps a representation of the control flow graph suitable for viewing with VCG to file.pass.vcg. How to use it correctly? I apologizes it its a very simple question. currently, I am trying in the following way: gcc -g -dv test.c Thanks -- Regards, Wei Li -- View this message in context: http://www.nabble.com/Correct-way-to-use-debugging-flags-tp24563438p24563438.html Sent from the gcc - Help mailing list archive at Nabble.com.