trivstring.h?

[Yuriy Skalko]

> 
> This ABI is only available starting with gcc 5:
> https://developers.redhat.com/blog/2015/02/05/gcc5-and-the-c11-abi/
> 
> Without it, gcc is not thread-safe, as weird as it may seem.
> 
> So It seems that we have to keep this a bit longer (unless we require gcc 5).
> 
> 
> JMarc

Yes, really 4.9 is not a choice for this.

GCC 5 even supports full C++14. So it have to wait until LyX 2.5...

Yuriy