Re: [PATCH v4 1/3] math.h: add DIV_ROUND_UP_NO_OVERFLOW

[Linus Torvalds]

On Tue, 24 Oct 2023 at 22:38, David Laight <David.Laight@xxxxxxxxxx> wrote:
>
> From: Linus Torvalds
> > >  - we can't even use a statement expression and __auto_type, because
> > > these things are used in type definitions etc and need to be constant
> > > expressions
>
> Doesn't min() get around that by using is_constexpr() and
> __builtin_choose_exptr() - the same could be done here.

Nope. I wanted to do it that way - it would have made things much
simpler and avoid the whole _Generic() thing, but try it - you cannot
use statement expressions in a non-function context even with
__builtin_choose_expr().

And no, min/max have never been usable in that context

                 Linus