[Interest] How do you want to select exactly C++11 with GCC 6+?

[Michael Sué]

> 1) is there a need for qmake to provide a way to select *exactly* C++11, not a later, available version?
I would say no.

> 2) 
but IF well then I would prefer option I
CONFIG += c++11          means plus c++11 language extensions
CONFIG += c++14          means plus c++11 and plus c++14 language extensions

- Michael.