Re: Regression in pathname between version 2.6.14 to 2.7.1

Raymond Toy <[email protected]> Fri, 20 Feb 2026 19:18:18 -0800
Newsgroups gmane.lisp.gcl.devel
Message-ID <[email protected]> 
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On 2/19/26 9:19 AM, Camm Maguire wrote:

> Greetings, and thanks for the note!
>
> Actually, I thought this was more of a feature rather than a bug.
> Pathname namestrings of the form "...//..." are inherently ambiguous
> (e.g. ...//.. means ..././... in Linux et.al., but means / in emacs) and
> are almost always the result of a lazy concatenation of paths, typically
> avoiding merge-pathnames which should always give the right answer:
>
>> (merge-pathnames  "../bar/baz" "etc/foo/")
>> #P"etc/foo/../bar/baz"
> That said I have a patch now testing which collapses // to /.

Thanks! I think it makes gcl more consistent with what other lisps do 
with paths like this.

&#8203;
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      <p style=3D"margin-bottom: 19.2px; margin-top: 0px;">On 2/19/26 9:1=
9
        AM, Camm Maguire wrote:<br>
      </p>
      <blockquote type=3D"cite"
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        <pre wrap=3D"" class=3D"moz-quote-pre">Greetings, and thanks for =
the note!

Actually, I thought this was more of a feature rather than a bug.
Pathname namestrings of the form "...//..." are inherently ambiguous
(e.g. ...//.. means ..././... in Linux et.al., but means / in emacs) and
are almost always the result of a lazy concatenation of paths, typically
avoiding merge-pathnames which should always give the right answer:

</pre>
        <blockquote type=3D"cite">
          <pre wrap=3D"" class=3D"moz-quote-pre">(merge-pathnames  "../ba=
r/baz" "etc/foo/")
</pre>
        </blockquote>
        <blockquote type=3D"cite">
          <pre wrap=3D"" class=3D"moz-quote-pre">#P"etc/foo/../bar/baz"
</pre>
        </blockquote>
        <pre wrap=3D"" class=3D"moz-quote-pre">That said I have a patch n=
ow testing which collapses // to /.</pre>
      </blockquote>
      <p style=3D"margin-bottom: 19.2px; margin-top: 0px;">Thanks! I thin=
k
        it makes gcl more consistent with what other lisps do with paths
        like this.</p>
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