Re: `eval-when-compile' can cause incorrect byte-compiler warnings

[Richard Stallman]

    > It may not be worth the trouble to change this at all if it still
    > won't be "correct".

    Yeah.  You can, of course, always byte compile the files individually
    if you want more correct warnings.

Unfortunately not, because this information is cumulative from
one compilation to the next.  You would have to start a fresh Emacs
to get just the right warnings for the file.