Can Qt4 applications be built with C++11?

[darenw]

I'm trying to use C++14 (or C++11) in a small Qt4 application. I have, for example,

auto layout = new QHBoxLayout;

auto layout = new QHBoxLayout;

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instead of the usual

QHBoxLayout *layout = new QHBoxLayout;

QHBoxLayout *layout = new QHBoxLayout;

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Compiling with g++ (Arch Linux, upgraded about a month ago) gives errors (copied by hand; copy/paste not working with my xterm today):

x.cpp:31:2: warning: 'auto' changes meaning in C++11; please remove it
  auto layout = new QHBoxLayout;
  ^
 
x.cpp:31:7: error: 'layout' does not name a type
  auto layout = new QHBoxLayout;
         ^

x.cpp:31:2: warning: 'auto' changes meaning in C++11; please remove it
  auto layout = new QHBoxLayout;
  ^

x.cpp:31:7: error: 'layout' does not name a type
  auto layout = new QHBoxLayout;
         ^

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Perhaps there's something wrong with the way I wrote the line with 'auto', or perhaps Qt4 isn't compatible with using C++11. I did find documentation for qmake (I'm actually using qmake-qt4) and the CONFIG variable, so I put this into the .pro file:

CONFIG += c++11

CONFIG += c++11

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Is there more I need to do? Am I a fool to try using C++11 or C++14?

Does Qt5 deal with C++11 the same way as Qt4?