Re: Parsing a language with optional spaces

[Christian Schoenebeck]

On Dienstag, 14. Juli 2020 07:02:36 CEST Akim Demaille wrote:
> > Le 13 juil. 2020 à 07:56, Akim Demaille <akim@lrde.epita.fr> a écrit :
> >> Le 12 juil. 2020 à 19:47, Christian Schoenebeck
> >> <schoenebeck@crudebyte.com> a écrit :>> 
> >> And BTW:
> >>> The GLR parsers require a compiler for ISO C89 or later.
> >> 
> >> Tough requirement! ;-)
> > 
> > Yes, we could get rid of that mention, indeed.  Besides, Valentin recently
> > pointed me to one very discreet place where glr.c actually had a
> > declaration after a statement, so it was actually C99.
> > 
> > I'll clean that up, thanks!
> 
> I'm installing this.
> 
> commit 88bd814bf103123c4f820f0a4f8fee85f8a63047
> Author: Akim Demaille <akim.demaille@gmail.com>
> Date:   Tue Jul 14 06:56:15 2020 +0200

Sure, looks fine to me!

> -Except for GLR parsers (@pxref{Compiler Requirements for GLR}), the C
> -code that Bison generates requires only C89 or later.  However, Bison
> -itself requires common C99 features such as declarations after
> -statements.  Bison's @code{configure} script attempts to enable C99 (or
> -later) support on compilers that default to pre-C99.  If your compiler
> -lacks these C99 features entirely, GCC may well be a better choice; or
> -you can try upgrading to your compiler's latest version.
> +Except for GLR parsers (which require C99), the C code that Bison generates
> +requires only C89 or later.  However, Bison itself requires common C99
> +features such as declarations after statements.  Bison's @code{configure}
> +script attempts to enable C99 (or later) support on compilers that default
> +to pre-C99.  If your compiler lacks these C99 features entirely, GCC may
> +well be a better choice; or you can try upgrading to your compiler's
> latest +version.

That would already be far beyond my personal level of detail. :) I mean it is 
absolutely correct, but you barely find a C compiler for that to be an issue 
at all nowaways. Usually you would need to explicitly force a compiler to 
strict ISO C89 for that to happen today.

Best regards,
Christian Schoenebeck