Re: Dynamic loading progress

[Paul Eggert]

On 11/19/2015 03:57 PM, Philipp Stephani wrote:
> Thanks. I saw you changed some other members to ptrdiff_t (the public 
> size members of emacs_runtime and emacs_env), is that intentional, and 
> if so, what is the reason?

As a general rule, in Emacs source code we prefer signed arithmetic to 
unsigned, because the latter is so error prone when it comes to 
comparisons. Also, signed arithmetic allows for better low-level 
checking, e.g., with -fsanitize=undefined. (There are a few exceptions, 
e.g., hash values, but they're relatively rare.)  So the module 
interface should encourage the use of signed integer arithmetic when 
possible.

It might also be useful to support modules that, for whatever reason, 
cannot deal with signed integers and must use unsigned integers. That 
could be something we add later, if necessary.

> Anyway, emacs-module.h now lacks an #include <stddef.h>.

Thanks, fixed now.