Concerns regarding the -ffp-contract=fast default

[Alexander Monakov]

On Mon, 18 Sep 2023, Martin Uecker wrote:

> > The hardest part would be popping the pragma state when leaving a block,
> > which didn't seem difficult (at least for C).
> 
> It is fairly restricted where it can appear, it essentially operates
> on the level of compound statements (!= blocks). 

Thanks for the clarification. Let me note that the standard somehow
decided to make out-of-place pragma a (compile-time) UB rather than
a constraint violation, leaving us free to make it work for blocks
(or launch Nethack).

Alexander