Adding QMAKE_CXXFLAGS += -std=c++11 to .pro file in qt not working(on linux 12.04)

Question

Compiler output:

[main.o] Error 1

cc1plus: error: unrecognized command line option '-std=c++11'

Answer 1

The solution is to update your ancient gcc version on the system. In fact, I am quite surprised that you have such an old version on your 12.04 Ubuntu variant. It should have 4.6.3 by deault.

What you could try is c++0x instead of c++11 and see if that makes it work. You could also fire up the gcc manual by issuing man gcc and look for the precise option.

Also, while we are it, you could probably simply write this in your qmake project file instead of such raw configurations:

CONFIG += c++11

Answer 2

As others already said in comments, this has nothing to do with Qt Creator version, but is caused by an g++ version that doesn't support C++11, for a little older g++ (but note that you need at least 4.3) the switch to enable the C++0x features implemented in the compiler is QMAKE_CXXFLAGS += -std=c++0x you can see the available features by following links in this page