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Re: m4_map_sep bug (introduced by 2005-06-06 Autoconf patch) breaks Biso

From: Paul Eggert
Subject: Re: m4_map_sep bug (introduced by 2005-06-06 Autoconf patch) breaks Bison
Date: Thu, 06 Oct 2005 10:06:52 -0700
User-agent: Gnus/5.1007 (Gnus v5.10.7) Emacs/21.4 (gnu/linux)

Stepan Kasal <address@hidden> writes:

> The empty list is represented by an empty string.

Yes, sorry, that's the point that I didn't get.

> 1) c.m4 and lalr1.cc contain:
>       m4_map([b4_symbol_actions], m4_defn([b4_symbol_destructors]))
>       m4_map([b4_symbol_actions], m4_defn([b4_symbol_printers]))
> Is it possible that there are no symbols?

No, there has to be at least a start symbol.  It would be nice if the
code worked even with no symbols, but it's not essential.

> To sum up, it seems that I'll come back with quite a huge bison cleanup
> patch, when I find some time.

That would be nice.  Thanks.  There is no rush, though obviously we'd
like to get Bison and Autoconf right.

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