How can compiled file include preprocessor macro info?

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How can compiled file include preprocessor macr...
\ scl (23 May 2006)

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Subject:	How can compiled file include preprocessor macro info?
Group:	Gcc-help
From:	scl
Date:	23 May 2006

I work on i686-pc-cygwin with gcc-3.4 and gcc-trunk, but the "-g3" not
generate preprocessor macro info. What I do wrong?
thanks!