[Development] QThread::create mandatory in Qt 6?

[Jean-Michaël Celerier]

(It also has the very nice feature of using lld on windows, which links
muuuuch faster than bfd / gold, which
could be useful for reducing CI times)
<http://www.jcelerier.name>


On Fri, Nov 20, 2020 at 9:27 PM Jean-Michaël Celerier <
jeanmichael.celerier at gmail.com> wrote:

> > The big problem I see on Windows is unfortunately not the C++ standard
> library, but the C standard library. MinGW defaults to crtdll, the one
> from
> MSVC 6, which is not C99-compliant (MSVC 6 is from 1998 after all). A
> better
> alternative exists in the form of the Universal CRT, but that only comes
> by
> default with Windows 10, so we'd need to drop support for 8.1 -- have we
> done
> that? -- and recompile GCC and/or LLVM so they ask the linker to link to
> ucrt.
>
> https://github.com/mstorsjo/llvm-mingw can be made to target ucrt; it
> even has
> releases: https://github.com/mstorsjo/llvm-mingw/releases/tag/20201020
>
> As a data point, I've been using this toolchain for my own stuff for a
> couple years now
> and it works really well, though I only exercise
> qtbase/qtdeclarative/couple of smaller libs.
>
> All the best,
> Jean-Michaël
>
>
> On Fri, Nov 20, 2020 at 5:09 PM Thiago Macieira <thiago.macieira at intel.com>
> wrote:
>
>> On Friday, 20 November 2020 00:09:46 PST Oliver Wolff wrote:
>> > The question is not about having one more supported Windows
>> > configuration. We do not have the resources to add more and more
>> > configurations to support, so it's more a "replace mingw for Windows
>> > with something else" situation. As there seems to be a need for an open
>> > alternative, it looks like we cannot/should not go the clang-cl way, but
>> > clang-mingw if we replace mingw with a clang toolchain.
>>
>> That is not an option. We must have one MinGW configuration.
>>
>> We can choose which compiler and which version thereof, especially if the
>> official MinGW comes with an old GCC. If we think Clang + libcompiler-rt
>> +
>> libc++ is a better solution for Windows, then we should explore it and
>> even
>> make it the default. But unless we do it RIGHT NOW, we will need an
>> overlap
>> period with a libstdc++ MinGW, due to ABI break.
>>
>> The big problem I see on Windows is unfortunately not the C++ standard
>> library, but the C standard library. MinGW defaults to crtdll, the one
>> from
>> MSVC 6, which is not C99-compliant (MSVC 6 is from 1998 after all). A
>> better
>> alternative exists in the form of the Universal CRT, but that only comes
>> by
>> default with Windows 10, so we'd need to drop support for 8.1 -- have we
>> done
>> that? -- and recompile GCC and/or LLVM so they ask the linker to link to
>> ucrt.
>>
>> --
>> Thiago Macieira - thiago.macieira (AT) intel.com
>>   Software Architect - Intel DPG Cloud Engineering
>>
>>
>>
>> _______________________________________________
>> Development mailing list
>> Development at qt-project.org
>> https://lists.qt-project.org/listinfo/development
>>
>
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