[Development] Supported compilers for Qt 6

[Alexandru Croitor]

Note that "red" in the page does not always mean unsupported, but also that nobody tested if the feature is present.

> On 12. Aug 2019, at 14:07, Allan Sandfeld Jensen <kde at carewolf.com> wrote:
> 
> On Monday, 12 August 2019 09:58:39 CEST Lars Knoll wrote:
>> I’d personally be favour of using newer version of gcc/clang, but I’m not
>> sure we gain a lot with it, as Apple clang is then probably the limiting
>> factor. But we could upgrade that to Apple Clang 11 as well.
> 
> Yeah, I was looking through https://en.cppreference.com/w/cpp/compiler_support 
> for good c++20 features we might chose to opt-in on. At first it looked like 
> there was a few promising options:
> 
> explicit(bool): We use some ugly patterns in places to simulate this.
> Requires gcc 9, clang 9, MSVC 19.22
> 
> char8_t: This has potential to break a bunch of stuff if we don't handle it 
> explicitly, as per previous discussion it might be hard to handle with ifdefs.
> Requires gcc 9, clang 7, MSVC 19.22
> 
> Integrating feature-test macros: Could make >c++17 feature detection more 
> elegant.
> Requires gcc 5, clang 3.4, MSVC 19.20
> 
> But then I noticed, they are all still missing from Apple clang 11 :(
> 
> So, yes. Apple clang is the new minimum setter. What a world.
> 
> 'Allan
> 
> 
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> 
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