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

Simon Hausmann Simon.Hausmann at qt.io
Fri Aug 23 17:58:09 CEST 2019


I ran into the crash a while ago in the CI. See also https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83562 .


On 23. Aug 2019, at 23:12, Thiago Macieira <thiago.macieira at intel.com<mailto:thiago.macieira at intel.com>> wrote:

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:

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.

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<http://intel.com>
 Software Architect - Intel System Software Products

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