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Re: [PATCH] use locale-indep. c_is* functions for parsing, not isspace,

From: Akim Demaille
Subject: Re: [PATCH] use locale-indep. c_is* functions for parsing, not isspace, isprint etc
Date: Fri, 31 Aug 2012 17:40:12 +0200

Le 5 août 2012 à 13:37, Jim Meyering a écrit :

> Hi Akim,

Hi Jim!

> On bison's master, building on Fedora 17 with gcc version 4.8.0 20120803
> failed due to a missing declaration of isspace in parse-gram.y.

Bummer :(

> It's best when parsing, to avoid using isspace and the other is*
> macros, because they use locale-dependent tables.  Do you want a
> grammar to be accepted in one locale and rejected in another?
> Or worse: to succeed but generate a parser with subtly different semantics?

You are right, I was very naive.

> There was one other use of isspace in scan-gram.l, along with
> a use of isprint.  This switches all of them to use gnulib's
> locale-independent c_-prefixed functions:

This is much better.  Yet the error is in maint too, and I'm not
sure there won't be a Bison 2.6.3.  Could you install it there?
I will merge eventually.  If you don't have time or if it not
going smoothly, please just let me know!

(Shouldn't some gnulib's syntax-check apply here?  Yes, some
isprint etc. are valid, but the warning can be disabled in that


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