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Re: workaround for virtualpc bug

From: Ralf Wildenhues
Subject: Re: workaround for virtualpc bug
Date: Fri, 28 Oct 2005 22:18:30 +0200
User-agent: Mutt/1.5.9i

Hi Christoph,

* Christoph Egger wrote on Fri, Oct 28, 2005 at 09:56:09PM CEST:
> > * Christoph Egger wrote on Fri, Oct 28, 2005 at 03:00:21PM CEST:
> > >
> > > When the conditions are met and the error appears, then you see
> > > this error:
> > > 
> > > Cannot export : symbol not defined
> > > Creating library file: $output_objdir/$libname.dll.a
> > > collect2: ld returned 1 exit status *snip*
> > > The patch works around the bug in virtualpc by not operating
> > > on an empty file.
> > 
> > Wouldn't this rather be a bug in sed?
> If this is a bug in sed, why wouldn't it have been catched earlier?

Hey, I don't know.  Apparently it isn't.

> I mean, if it is a sed bug rather one in virtualpc, then there
> should be more platforms where this issue is reproducable.
> > > The patch has been reviewed and okey'd by Peter Ekberg (who
> > > originally wrote the piece of code the patch touches).
> > 
> > Does this simpler patch also work?
> No, this patch does not work. hmm... so my patch is more likely
> to work around a bug in sed than in virtualpc then ...?


> > Which sed version is this, by the way?
> This is GNU sed 4.1.4.

OK.  I would like to understand the issue before applying your patch:
I dislike very much any 'fix' where the issue isn't fully analyzed, for
several reasons: there might be other places that need fixing, the issue
might be solved easier or more thoroughly in a different way, some other
component might need fixing instead of Libtool (or additionally).

Could you please find out for me:
- whether empty files in general get messed up in your setup
- whether newline encoding is the issue
- whether the
   sed -e '/[ ,]DATA/!d;s,\(.*\)\([ \,].*\),s|^\1$|\1\2|,' 
  outputs something weird.

Your patch looks ok otherwise.


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