Can g++ print macro expansion?

[kk_oop]

Anyone know to ask g++ to show me source code post macro expansion? I have a #define that doesn't seem to be expanded as I expect.

Thanks!

[gerard4143]

I think this will do it

g++ -E filename.cpp

Actually your probably better using

g++ -E filename.cpp>testfile

Then open testfile in an editor

[Rubberman]

From the gcc man page:

       -E  Stop after the preprocessing stage; do not run the compiler proper.  The
           output is in the form of preprocessed source code, which is sent to the
           standard output.

           Input files which don’t require preprocessing are ignored.