[Development] QProperty and library coding guide

[Lars Knoll]

> On 17 Jul 2020, at 10:47, Ulf Hermann <ulf.hermann at qt.io> wrote:
> 
> 
>> 
>> Would it be sensible to make this a configure feature: if C++20 is explicitly enabled, use it? It’s in the standard after all.
>> But auto-detecting it is perhaps unnecessarily fragile.
> 
> No, we should just static_assert for [[no_unique_address]] being available on the platforms where we expect it. That is, anywhere but on certain MSVCs.

Some older embedded toolchains don’t have the flag neither. 
> 
> If we make it a configure feature, we open the door to BIC problems as we might accidentally turn it off in some builds.
> 
We should simply add a static assert that the Qt and the applications build mode are compatible. 

Cheers,
Lars

> Ulf
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