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Re: Preprocessor woes
From: "Zack Weinberg" <zackw@stanford.edu>
Date: Fri, 5 Jan 2001 14:40:26 -0800
On Fri, Jan 05, 2001 at 09:45:55PM +0000, Neil Booth wrote:
> Mark Kettenis wrote:-
>
> > occur. Since the SHLIB_COMPAT macro uses the ISO C ## concatenation
> > operator, -traditional messes things up. Is there any chance at
> > convincing the GCC folks to provide a preprocessor that's backwards
> > compatible with cccp?
>
> Try using the portable CONCAT macros that GCC does. That's much
> simpler than rewriting tradcpp (which is what this would require).
Concatenation with ## has never worked in -traditional mode. The real
problem is something else.
We used to preprocess this stuff without -traditional. Then the new
preprocessor introduced some whitespace in funny places; see
<http://sources.redhat.com/ml/libc-alpha/2000-11/msg00262.html>. Then
Ulrich switched to -traditional (I think after a suggestion from you
or Neil). And now the Hurd doesn't build anymore :-(.
I cc'd you GCC folks to make you aware that the new preprocessor is
causing some real pain, and I saw no way out. Fortunately there are
at least two workarounds (thanks Neil and Jakub). I still think it
would be better if the new integrated preprocessor would be backwards
compatible with the old one, even for sources that are not C.
Mark