Prickliness of the "invalid byte code" stuff

[Lars Ingebrigtsen]

One thing that I've always wondered about when building Emacs is that
running Emacs instances then start to fail in odd ways:

url-http-parse-headers: Invalid byte code in 
/home/larsi/src/emacs/trunk/lisp/emacs-lisp/cl-seq.elc [8 times]

And it's almost always with this "invalid byte code" stuff.

What does it mean, really?  Is there some sanity check to ensure that
you're not running an .elc file designed for a different Emacs build,
or...  something else?

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no