Re: package for silencing the bytecompiler

Re: package for silencing the bytecompiler

[Eric Eide]

"Klaus" == Klaus Berndl <Klaus.Berndl@sdm.de> writes about `silcomp.el' (in
group `gnu.emacs.sources'):

	Klaus> ;; foo.el should be work for both of Emacs and XEmacs, so we use
	Klaus> ;; the functions `display-message' and `clear-message' for the
	Klaus> ;; XEmacs stuff and the variables `message-log-max' and
	Klaus> ;; `message-truncate-lines' for Emacs. The XEmacs-symbols are
	Klaus> ;; unbound in Emacs and vice versa. Therefore the bytecompiler
	Klaus> ;; throws warnings about undefined symbols. [...]
	Klaus> ;;
	Klaus> ;; With silcomp.el you can silence the bytecompiler for foo.el:
	Klaus> ;; [...]
	Klaus> ;;      | ;; XEmacs
	Klaus> ;;      | (silcomp-defun display-message)
	Klaus> ;;      | (silcomp-defun clear-message)
	Klaus> ;;      | ;; Emacs
	Klaus> ;;      | (silcomp-defvar message-log-max)
	Klaus> ;;      | (silcomp-defvar message-truncate-lines)

For a different approach to avoiding portability-related warnings from the byte
compiler, look at my `emacs-vers.el' package:

  <http://www.cs.utah.edu/~eeide/emacs/emacs-vers.el.gz>

With `emacs-vers.el', one can specify that Emacs flavor/version tests should be
resolved at compile-time by the byte compiler.  The optimizer can then
eliminate dead code (i.e., for the non-targeted versions of Emacs) that would
otherwise give rise to various warnings about undefined symbols, etc.

(Note that compile-time version testing is *not* the default behavior of the
`emacs-vers.el' package.  Comments in the file describe how one chooses between
run-time and compile-time version tests.)

Of course, compile-time version determination is not always what one wants.
For cases in which one wants run-time tests, `silcomp.el' looks like a nice way
to avoid unwanted warnings.

Eric.

-- 
-------------------------------------------------------------------------------
Eric Eide <eeide@cs.utah.edu>  .         University of Utah School of Computing
http://www.cs.utah.edu/~eeide/ . +1 (801) 585-5512 voice, +1 (801) 581-5843 FAX