C bitfields guarantees

[Steven Schveighoffer]

On Friday, 5 July 2024 at 16:35:43 UTC, Walter Bright wrote:
> On 7/4/2024 10:37 PM, Richard (Rikki) Andrew Cattermole wrote:
>> Today many people have spent some time to try and understand 
>> Walter's belief that C is "good enough" for bit fields in 
>> terms of guarantees.
>
> It's straightforward. If you use uint as the field type, you'll 
> get the same layout across every C compiler I've ever heard of.

What if you need > 32 bits or want to pack into a `ulong`? Is the 
behavior sane across compilers?

-Steve