Unable to run static analysis in C++14 mode

I have a QMake based (.pro) project with

CONFIG += c++14

and

QMAKE_CXXFLAGS += -std=c++14

It builds fine with gcc and clang.

When I run the clang static analyzer, it fails on most files, complaining about code using C++14 features. I noticed it was run with

-std=gnu++11

Maybe it's just me, but I took some time looking in QtCreator settings, kiks, and googling it, but I couldn't find any way to make Qt Creator to run clang analyzer in C++14 mode or more generally to change its command line arguments. Also, I replaced every occurence of

gnu++11

with

c++14

in /usr/share/qt/mkspecs and /usr/share/qt4/mkspecs so it might be hardcoded somewhere ?