Re: braced variable expansion in here documents

[Stepan Kasal]

Hi,

attached please find a patch which checks for the ksh93f bug in
expanding here-documents.

I understand that changing the better shell routine might be
dangerous; but it is less dangerous in this case:

Ralf made a quick search and it seems that the UnixWare was the only
one having that among the candidates for a better shell.
(Solaris has it under the name `dtksh' and AIX under the name
`ksh93'.)

On Fri, May 26, 2006 at 10:24:09AM -0700, Paul Eggert wrote:
> The problem isn't dtksh; it is systems that use, or plan to use, ksh93
> under some name like 'ksh' or 'sh'.  This could well be more of a
> problem in the near future.

I think this was written before Ralf found out that ksh93g fixes the
bug.

To sum up, I believe my check won't stir up the better shell
selection too much.  Dear ``release engineer'' would you consider
installing it now?

In any case, I believe we need it in the long run: the bug is mean,
hard to identify, and it is possible that it will hit an innocent
user who has a long here-document in his configure.ac.

The patch also contains some sharpening of the documentation
describing the bug.  Is the wording OK?

Have a nice day,
        Stepan

autoconf-20060602-here-doc.patch
Description: Text document