Why is ptrdiff_t a volatile?

[Marc Glisse]

On Mon, 1 Oct 2018, Toby Douglass wrote:

> Good morning/afternoon/evening, all.
>
> I've been writing some position independent data structure code.
>
> As such, I've been using ptrdiff_t.
>
> I've just noticed, while compiling, that my GCC (6.3.0) has ptrdiff_t as a 
> volatile long int.

I doubt gcc does that. More likely your code has a broken macro somewhere. 
You don't provide enough information for us to help more...

-- 
Marc Glisse