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

Robert Löhning robert.loehning at qt.io
Fri Nov 27 18:11:21 CET 2020

Am 16.11.2020 um 08:55 schrieb Allan Sandfeld Jensen:
> On Montag, 16. November 2020 02:53:14 CET Thiago Macieira wrote:
>> On Sunday, 15 November 2020 08:29:56 PST Thiago Macieira wrote:
>>>> * whether there is any chance to get a fix or workaround in the near
>>>> future
>>>> (or even right now), either in the form of an upgrade to the vendor
>>>> compiler or in the form of a third-party compiler (e.g., GCC or Clang,
>>>> which both support many platforms).
>>> Probably no chance.
>> Sorry, by that I meant to say "no chance of getting a fix in", since it
>> depends on fixing the Microsoft STL and I don't expect they're very
>> interested. Their first and foremost priority is the VC++ compiler.
>> But the second part of your proposal is easy: use either cl or gcc or clang
>> (with either libstdc++ or libc++), two combinations of which are supported
>> by Qt on Windows and I wouldn't be surprised if the rest using those
>> compilers also worked.
>> ✓ VC++ with MS STL 	(officially supported)
>> ✓ gcc with libstdc++ 	(officially supported)
>> ❓ gcc with libc++ 	(likely works)
> I doubt anyone ever tests this combo though.
>> ❓ clang with libstdc++	(likely there are people using)
>> ❓ clang with libc++ 	(likely works)
> Is used for fuzzing builds, so I assume actively tested outside our
> integration.

Indeed. Builds for fuzzing can be done without it, but Google's oss-fuzz 
uses clang 12.0.0 with flag "-stdlib=libc++".

This works fine in 5.15. I don't know about 6.0 yet. I get build errors 
there, but I don't know if they're related to this.


>> ✗ clang-cl with MS STL  (currently broken)
> It is? I often use this when building qtwebengine for Windows. Been advocating
> for an automated test for a while.
>> ❓❓ clang-cl with libc++	(no clue)
> You mean clang? Clang-cl.exe is the MSVC compatible clang version, and
> clang.exe the "gcc" (crossplatform clang) compatible. Which I assume also
> means thereis clang.exe with libstdc++ for mingw compatible builds.
> 'Allan
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