[Interest] Can I get c++14 instead of g++14?

[Nikos Chantziaras]

After upgrading to Qt 5.6.0 on Linux, when I do:

   CONFIG += c++14

in my project file, the build uses -std=gnu++14. Do I have to manually 
remove that and use -std=c++14, or is there a way to tell qmake to not 
enable GNU extensions without me saying so?