CODEWITHSUNDEEP
qtc++14
phcerdan
phcerdan

Reputation: 812

How to build Qt 5 from source with c++14 support

I am attempting to build Qt 5.4.1 pulled from git with the -std=c++14 flag for gcc4.9. But I am not sure about how to properly pass the flag into the build process.

I have read that adding CONFIG += c++14 to a qt project file should work since Qt5.4, so I have added it into the qt.pro located in the top folder.

But Qt is still compiled with -std=c++0x (c++11).

Upvotes: 2

Views: 2877

Answers (1)

Tomilov Anatoliy
Tomilov Anatoliy

Reputation: 16741

If you using g++ or clang++ to build the Qt 5, then go to qt5/qtbase/mkspecs/common/g++-base.conf or qt5/qtbase/mkspecs/common/clang.conf respectively and simply change the right hand side of QMAKE_CXXFLAGS_CXX11 = -std=c++11 assignment to (for example) -std=gnu++1z (or to whatever you need).

To build Qt 5 you have to run qt5/configure script with -c++11 provided (and -platform linux-clang-libc++ or linux-clang or linux-g++ or whatever you need — the parameter is the qt/qtbase/mkspecs/*/ directory name represented your platform).

Upvotes: 3

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