From: Assaf Gordon <assafgordon@gmail.com>
To: Dani Moncayo <dmoncayo@gmail.com>, Glenn Morris <rgm@gnu.org>
Cc: 18612@debbugs.gnu.org
Subject: bug#18612: [platform-testers] Emacs pretest 24.3.94
Date: Thu, 02 Oct 2014 18:06:17 -0400 [thread overview]
Message-ID: <542DCC59.3040803@gmail.com> (raw)
In-Reply-To: <CAH8Pv0gUox-tmAMSGU1ubyXsU6esn9CiRHemkr_bti+-8fPxhg@mail.gmail.com>
On 10/02/2014 05:07 PM, Dani Moncayo wrote:
> On Thu, Oct 2, 2014 at 10:09 PM, Glenn Morris <rgm@gnu.org> wrote:
>>
>> But other platforms may still try to parse (?) those lines, even if they
>> don't execute them. Presumably that explains:
<...>
> To find out if that's the case here, Assaf could run the configure
> script again, with this patch applied:
The patch itself was not enough, because it still contains the offending lines.
However, I think I managed to reduce the case to this:
=== MINIX R3.3.0 ===
$ sh -c 'echo ${a:0:1}'
sh: Syntax error: Bad substitution
$ sh -c 'true && echo ${a:0:1}'
sh: Syntax error: Bad substitution
$ sh -c 'false && echo ${a:0:1}'
sh: Syntax error: Bad substitution
=== Debian 7.6 ===
$ dash -c 'echo ${a:0:1}'
dash: 1: Bad substitution
$ dash -c 'true && echo ${a:0:1}'
dash: 1: Bad substitution
$ dash -c 'false && echo ${a:0:1}'
(no error printed)
=== NetBSD 6.1.4 ====
$ sh -c 'echo ${a:0:1}'
sh: Syntax error: Bad substitution
$ sh -c 'true && echo ${a:0:1}'
sh: Syntax error: Bad substitution
$ sh -c 'false && echo ${a:0:1}'
sh: Syntax error: Bad substitution
but:
$ ksh -c 'echo ${a:0:1}'
ksh: : bad substitution
$ ksh -c 'true && echo ${a:0:1}'
ksh: : bad substitution
$ ksh -c 'false && echo ${a:0:1}'
(no error printed)
====
The "offending" system is MINIX R3.3.0 (which isn't officially supported).
It is supposed to be MINIX kernel + NetBSD user-space,
so I'm not quite sure why "./configure" on NetBSD works while on MINIX it doesn't.
(something to do with re-exec as "ksh" ? though MINIX does have "/bin/ksh" ).
In any case, I think the examples above demonstrate that MINIX's default shell does parse the shell statements regardless of execution or not, unlike 'dash' or 'ksh'.
I don't know if this is POSIX-compliant-behaviour or not.
Regards,
- Assaf
next prev parent reply other threads:[~2014-10-02 22:06 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-02 1:13 Emacs pretest 24.3.94 Glenn Morris
2014-10-02 19:22 ` bug#18612: [platform-testers] " Assaf Gordon
2014-10-02 19:47 ` Eli Zaretskii
2014-10-02 20:09 ` Glenn Morris
2014-10-02 21:07 ` Dani Moncayo
2014-10-02 22:06 ` Assaf Gordon [this message]
2014-10-02 22:11 ` Assaf Gordon
2014-10-02 22:48 ` Dani Moncayo
2014-10-02 22:33 ` bug#18612: non-portable shell substitution in configure.ac Paul Eggert
2014-10-06 4:50 ` Emacs pretest 24.3.94 Drew Adams
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