Proposal: Remove "Frameworks compiler requirements and Modern C++" from Policies

[Albert Astals Cid]

El dimarts, 25 de novembre del 2025, a les 1:35:03 (Hora estàndard d’Europa 
central), Michael Pyne va escriure:
> On 11/24/25 3:58 PM, Neal Gompa wrote:
> > On Mon, Nov 24, 2025 at 3:54 PM Albert Astals Cid <aacid at kde.org> wrote:
> >> https://community.kde.org/Frameworks/Policies#Frameworks_compiler_require
> >> ments_and_Modern_C++
> >> 
> >> It is wildly outdated, so I would suggest to remove it.
> >> 
> >> Or does someone have a suggested way to update it?
> > 
> > As far as I know, starting from 6.0, we require a C++20 capable
> > compiler. That means at least GCC 12, Clang 14, or MSVC 2022 I
> > believe.
> 
> I think there is value in having the policy for allowable C++ standards
> and/or compilers written down in some easily-accessible form.  Perhaps a
> bit more future-proofed so it doesn't get wildly outdated again.  I've
> been able to find references to requiring C++20-supporting compilers for
> KF6 starting from 6.0.

The problem is, what is the value of a policy if we do not check/enforce it?

Right now the only thing we can say is "it builds with whatever compilers we 
have in CI".

Cheers,
  Albert

> 
> Are there any other relevant policies that apply to KF6 for C++ support
> and/or compiler support? Assuming not, I'd propose that the page be
> updated to note that KDE Frameworks require a C++20-compatible compiler,
> and that the compiler must also be supported by the minimum required Qt
> version as listed in the prior section.
> 
> If it were not for Qt supporting as far back as GCC 9 (for openSUSE) we
> might simply be able to require the same compiler Qt requires.  But it's
> not until GCC 12 you get nearly full support for C++20 (and even 12
> still misses parts of C++ modules support), so it's probably still worth
> mentioning we require a C++20-capable compiler.
> 
> I'll volunteer to update the page if that works, something along the
> lines of KF6 requires a C++ compiler that is compliant with at least
> C++20 and supported by the oldest supported Qt 6 minor release.
> 
> Regards,
> 
>   - Michael Pyne