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Re: Avoiding this byte compile warning


From: rgb
Subject: Re: Avoiding this byte compile warning
Date: 11 Jan 2007 09:46:56 -0800
User-agent: G2/1.0

Tim X wrote:
> "rgb" <rbielaws@i1.net> writes:
>
> > I get the following message if the column-marker feature isn't
> > available.
> >
> > tal-mode.el:1367:26:Warning: the following functions are not known to
> > be defined: column-marker-1,  column-marker-2
> >
> > What's the proper way to code the function below so that it works the
> > way I want but doesn't cause a warning?
> >
> > Thanks.
> >
> >
> > (defun tal-setup-column-markers ()
> >   "Turns on column markers if configured and available.
> > See `tal-column-marker-1' and `tal-column-marker-2' "
> >   (if (condition-case ()
> >           (progn (require 'column-marker) nil)
> >         (error t))
> >       (if (not (and (zerop tal-column-marker-1)
> >                     (zerop tal-column-marker-2)))
> >           (message "column markers are configured but %s"
> >                    " column-marker feature not available."))
> >     (setq indent-tabs-mode nil)      ;documented as buffer local
> >     (column-marker-1 tal-column-marker-1)
> >     (column-marker-2 tal-column-marker-2)))
> >
>
> You could try a combination of eval-when-compile and condition-case at the
> beginning of your file. e.g. (not tested)
>
> (eval-when-compile
>   (condition-case nil
>     (require 'blah)
>    (error nil)))
>
Thanks, yes, I did try
I changed it to look like this:

(eval-when-compile (require 'column-marker () t))

(defun tal-setup-column-markers ()
  "Turns on column markers if configured and available.
See `tal-column-marker-1' and `tal-column-marker-2' "
  (unless (and (zerop tal-column-marker-1)
               (zerop tal-column-marker-2))
    (if (featurep 'column-marker)
        (progn (setq indent-tabs-mode nil) ;documented as buffer local
               (column-marker-1 tal-column-marker-1)
               (column-marker-2 tal-column-marker-2))
      (message "column markers are configured but %s"
               " column-marker feature is not available."))))

But that just results in a different warning

tal-mode.el:1366:26:Warning: the following functions might not be
defined at runtime: column-marker-1, column-marker-2



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