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Re: _AS_ECHO_N_PREPARE - bug correction in ksh88 on AIX 6.1

From: Eric Blake
Subject: Re: _AS_ECHO_N_PREPARE - bug correction in ksh88 on AIX 6.1
Date: Mon, 29 Jun 2009 22:13:15 -0600
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According to Ralf Wildenhues on 6/28/2009 1:24 AM:
> * Eric Blake wrote on Sat, Jun 27, 2009 at 04:01:15PM CEST:
>> According to Ralf Wildenhues on 6/25/2009 9:18 PM:
>>> * Jan Madzik wrote on Thu, Jun 25, 2009 at 06:48:37PM CEST:
>>>> I found bug in korn shell (version M-11/16/88f) on AIX 6.1 (tested
>>>> only on one server instance) and due to this bug I couldn't correctly
>>>> configure ImageMagick.
>>> Confirmed on AIX 5.3, thanks for the bug report.
>>> This patch should be sufficient to fix this instance of the bug, but
>>> it's still lacking a testsuite and documentation addition.
>> So how exactly do you describe the bug?  Using 'echo \c' inside a command
>> substitution corrupts state until the next command substitution echo?
> Yes, I think that's what it is.

Let's get that documented, then, before approving this patch, although I'd
like to see the fix go in before 2.64.

> More generally though, I'd
> be wary of uses of ECHO_C within command substitutions, as the
> substitution will strip off a trailing newline anyway, so it shouldn't
> be a wide-spread problem.

True enough, and worth mentioning as part of the documentation.  I don't
have access to an AIX machine, so I'm trusting your patch has been
properly tested.

- --
Don't work too hard, make some time for fun as well!

Eric Blake             address@hidden
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