How to set qmake to C++14 with recent MinGW?

Question

I know there are many duplicates.

This is my Test.pro:

CONFIG += c++14
SOURCES += main.cpp

and my main.cpp:

int mai         


        

Answer 1

The version of Qt that you're using doesn't explicitly support the compiler you're using. You can do either one of the following:

1. Set both QMAKE_CXXFLAGS_CXX14 and QMAKE_CXXFLAGS_GNUCXX14 in your project:

   win32-g++ {
      QMAKE_CXXFLAGS_CXX14 = -std=c++14
      QMAKE_CXXFLAGS_GNUCXX14 = -std=c++14
   }
   

2. Edit the default values of those two variables as above, in mkspecs/win32-g++/qmake.conf within your Qt installation folder.

3. Add a new mkspec copied from win32-g++, targeting your compiler, and build your Qt using it. All the project that use that Qt will then behave correctly w.r.t. C++14 support.