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From: Bruno Haible <bruno@clisp.org>
To: Rich Felker <dalias@libc.org>
Cc: "A. Wilcox" <awilfox@adelielinux.org>,
	bug-bison@gnu.org, musl@lists.openwall.com, bug-gnulib@gnu.org
Subject: Re: [musl] Building Bison 3.7 with musl (was Re: portability issues with unicodeio)
Date: Thu, 30 Jul 2020 03:43:40 +0200	[thread overview]
Message-ID: <2117749.CLknGyfR5K@omega> (raw)
In-Reply-To: <20200730000527.GS6949@brightrain.aerifal.cx>

[CCing bug-gnulib]

Rich Felker wrote:
> I don't think the '*' has anything to do with it being a bullet
> character. It's just the implementation-defined replacement character
> musl's iconv uses.

Correct.

> I would guess the code in bison and coreutils printf is assuming the
> non-conforming glibc behavior for iconv of returning an error if a
> character from the input is not exactly representable in the output,
> rather than making replacements and returning the number of inexact
> conversions made.

Yes and no. The code is not making assumptions about a particular iconv()
implementation. But it needs to distinguish two categories of replacements
done by iconv():
  - those that are harmless (for example when replacing a Unicode TAG
    character U+E00xx with an empty output),
  - those that are better not presented to the user, if the programmer has
    specified a fallback (for example, replacing all non-ASCII characters
    with NUL, '?', or '*').

The standards don't help in making the distinction.

Therefore whether you consider said glibc and libiconv behaviour as
"non-conforming" or not is irrelevant.

I have now adjusted the code to handle musl libc better.

Bruno


  parent reply	other threads:[~2020-07-30  1:44 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-29 23:23 A. Wilcox
2020-07-29 23:48 ` A. Wilcox
2020-07-30  0:05 ` Rich Felker
2020-07-30  0:12   ` A. Wilcox
2020-07-30  1:43   ` Bruno Haible [this message]
2020-07-30  9:02     ` Florian Weimer
2020-07-30  9:39       ` [musl] Re: iconv replacements Bruno Haible

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