Re: windows build help

[Paul Eggert]

>    > one can write Elisp code that compiles to different .elc files
>    > depending whether the compiling Emacs is built for a 32 or 64 bit machine,
>
> Just for curiosity's sake, would anyone like to tell me what circumstances
> this happens in?

For example, given this source code:

(defconst x (* 32768 32768))

On a 64-bit machine, byte-compiling generates an .elc file containing this:

(defconst x 1073741824)

On a 32-bit machine, byte-compiling the same source code generates an .elc file 
containing this instead:

(defconst x 0)

due to multiplication overflow in this Emacs's integers, which use 30-bit two's 
complement. Each .elc file is correct for the Emacs it is built with, but 
incorrect for the other Emacs.

GNU Emacs source code should not do this sort of thing, since the .elc files 
distributed in its tarballs are supposed to be portable.