There is at least a small utility distributed with Perl to help expanding the macros without having to talk to gcc /E yourself: expand-macro.pl. Of course that only shows you what the macros expand to, eventually, and not what the C code means.

In reply to Re^3: XS replacing my c library, not compatible with OS threads by Corion
in thread XS replacing my c library, not compatible with OS threads by patcat88

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