Re: incorrect warning when byte compiling?

[Stefan Monnier <monnier@iro.umontreal.ca>]

> Is this a bug/limitation in the Emacs byte compiler?

Bug, no, limitation, yes.

> It's easy enough to silence this warning (e.g., with (when (fboundp
> whitespace-mode) ...)), but I want to know why Emacs thinks this
> is a problem.

Doing "(eval-when-compile (require 'whitespace nil t))" and
then "(when (require 'whitespace nil t)" is very unusual so the
byte-compiler does not try to handle this kind of circumstance cleverly.

Really, (eval-when-compile (require 'whitespace nil t)) is meant for the
case where `whitespace' defines functions or macros which will be called
during byte-compilation; it's not meant to silence compiler warnings.

Rather than fboundp, you can also use `declare-function', whose purpose
is specifically to silence compiler warnings.


        Stefan