Correct way to use debugging flags

[weili747]

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
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