[Development] Requiring minimum GCC 7/MinGW (was: Dropping MinGW support in Qt 6 (Was: HEADS-UP: QStringLiteral))

[Konstantin Tokarev]

23.08.2019, 18:11, "Thiago Macieira" <thiago.macieira at intel.com>:
> On Friday, 23 August 2019 00:12:50 PDT Roland Winklmeier wrote:
>>  Just for your awareness: There is an old bug related to thread_local in
>>  MinGW which afaik was never fixed. It compiles correctly, but every
>>  executable crashes during shutdown. Not sure if this relevant in this case,
>>  just mentioning it:
>>  https://github.com/msys2/MINGW-packages/issues/2519
>
> The description of the bug says "winpthreads", which means it's not MinGW,
> it's Cygwin/MSYS2.
>
> libgcc on pure MinGW doesn't use winpthreads, it uses Win32.

std::thread and co are not implemented for win32, so we use pthreads version
in Coin and distribute it with SDK.

>
> Anyway, let's apply Q_THREAD_LOCAL. If that causes GCC-built MinGW
> applications to crash on exit, then we stop using GCC and switch to Clang.
>
> --
> Thiago Macieira - thiago.macieira (AT) intel.com
>   Software Architect - Intel System Software Products
>
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-- 
Regards,
Konstantin