[Development] How to document distros and compilers that Qt supports

[Tor Arne Vestbø]

> On 13 Aug 2019, at 11:39, Tony Sarajärvi <tony.sarajarvi at qt.io> wrote:
>  
> MacOS is another good example where we claim to support the latest 3 available at the time of release. But in 4 years of an LTS release we actually don’t have a single one of those 3 left that were out when we released 5.x.0. Are we now supporting the ones documented when the initial minor release came out, or the latest 3 available at the time of the latest patch release? Especially when talking about macOS people tend to update to the latest one, so why support older ones.

The docs are a bit off here, as we do support future macOS versions, within the constraints of the branch policy. 

See this presentation for more details:

https://docs.google.com/presentation/d/1jJDTDNnIne9c2hNSIZZPoNxWal7wmHyDSS-iI1h-2AY/edit?usp=sharing

Tor Arne