[Development] thread_local: replacing GCC with Clang for MinGW

[Jean-Michaël Celerier]

I'm using this toolchain to build qtbase, declarative, svg, websockets,
serialport and a few other : https://github.com/mstorsjo/llvm-mingw

I think that it has also been used for webengine.

Jean-Michaël

On Fri, Aug 23, 2019 at 8:16 PM Thiago Macieira <thiago.macieira at intel.com>
wrote:

> Restarting the thread since it changed subjects many times and has gone
> back
> and forth.
>
> Simon wrote:
> > I ran into the crash a while ago in the CI. See also
> > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83562 .
>
> That bug report shows that GCC does not properly implement thread_local on
> MinGW 32-bit over 8 years after the publication of the standard and over 4
> years after the feature became available on other platforms.
>
> I am proposing we make the C++11 thread_local feature mandatory and stop
> supporting any compilers that fail to support it.
>
> That would exclude GCC on MinGW 32-bit. 32-bit Windows GCC-compatible-ABI
> support would be provided by Clang.
>
> If this proposal seems acceptable, we need to see if it is technically
> feasible: can Clang/MinGW compile our codebase? And how does one go about
> installing it?
>
> --
> Thiago Macieira - thiago.macieira (AT) intel.com
>   Software Architect - Intel System Software Products
>
>
>
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