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Re: The meaning of double-underscore symbols

From: <kfogel_at_collab.net>
Date: 2005-10-04 21:49:28 CEST

Philip Martin <philip@codematters.co.uk> writes:
> > "Max Bowsher" <maxb@ukf.net> writes:
> >> svn_error__locate: used almost everywhere
> >
> > Mmm, sort of.
> >
> > It's present in the expansions of some svn_err_* macros, but that's
> > okay. Those macros are in the correct space, and whatever they want
> > to do is fine, because the macro would always be changed along with
> > the internal implementation on which it depends.
> Although macros hide the double underscore name at the source code
> level, the compiled object code will still have a dependency on the
> svn_error__locate name. Thus we have to treat svn_error__locate like
> any other public symbol, despite the use of double underscore.

It depends on what "treat ... like" means, exactly.

Internally, Subversion can guarantee (to itself) that it will only use
svn_error__locate() for these macros. Thus, anyone using the macros
together with the correct set of full Subversion libraries -- which is
how we say Subversion works -- will not run into trouble. Were we to
change the definition of svn_error__locate(), we'd change the macros
at the same time.

Can you say a scenario you have in mind, where having the symbols be
in the object code, even if not the source code, would be a problem?
I feel like I may be being insufficiently imaginative here...


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Received on Tue Oct 4 22:58:56 2005

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