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    Solved 'CONFIG += c++17' does not take an effect in .pro file.

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    • D
      Dmitriano last edited by Dmitriano

      I have

      CONFIG += c++17
      

      in my .pro file, but getting the following compiler errors:

      error C4984: 'if constexpr' is a C++17 language extension
      error C7525: inline variables require at least '/std:c++17'
      

      My QT version 5.13
      Compiler: MSVC 2017.

      J.Hilk 1 Reply Last reply Reply Quote 0
      • J.Hilk
        J.Hilk Moderators @Dmitriano last edited by

        hi @Dmitriano
        take a look at this bug report
        https://bugreports.qt.io/browse/QTBUG-67527

        seems like c++1z is the way to go.

        Be aware of the Qt Code of Conduct, when posting : https://forum.qt.io/topic/113070/qt-code-of-conduct

        Qt Needs YOUR vote: https://bugreports.qt.io/browse/QTQAINFRA-4121


        Q: What's that?
        A: It's blue light.
        Q: What does it do?
        A: It turns blue.

        D 1 Reply Last reply Reply Quote 0
        • D
          Dmitriano @J.Hilk last edited by Dmitriano

          Hi @J.Hilk !
          I do not know exactly what 'c++1z' is, but it has the same effect, there are still the same compiler errors. (I deleted the build directory and did a clean build).

          J.Hilk 1 Reply Last reply Reply Quote 0
          • J.Hilk
            J.Hilk Moderators @Dmitriano last edited by

            @Dmitriano did you make a complete rebuild of your project, clean -> qmake -> make?

            Changing the pro file will require a complete recreation

            Be aware of the Qt Code of Conduct, when posting : https://forum.qt.io/topic/113070/qt-code-of-conduct

            Qt Needs YOUR vote: https://bugreports.qt.io/browse/QTQAINFRA-4121


            Q: What's that?
            A: It's blue light.
            Q: What does it do?
            A: It turns blue.

            D 1 Reply Last reply Reply Quote 0
            • D
              Dmitriano @J.Hilk last edited by

              @J.Hilk
              yes I replaced

              #CONFIG += c++17
              CONFIG += c++1z
              

              removed the build directory and rebuilt the project.

              J.Hilk aha_1980 2 Replies Last reply Reply Quote 0
              • J.Hilk
                J.Hilk Moderators @Dmitriano last edited by

                @Dmitriano
                well I#m out of ideas,

                according to this reference
                https://doc.qt.io/qt-5/qmake-variable-reference.html

                it should work, if your compiler supports it.
                I would assume, that MSVC2017 does indeed support c++17 😟

                Be aware of the Qt Code of Conduct, when posting : https://forum.qt.io/topic/113070/qt-code-of-conduct

                Qt Needs YOUR vote: https://bugreports.qt.io/browse/QTQAINFRA-4121


                Q: What's that?
                A: It's blue light.
                Q: What does it do?
                A: It turns blue.

                D 1 Reply Last reply Reply Quote 0
                • aha_1980
                  aha_1980 Lifetime Qt Champion @Dmitriano last edited by

                  @Dmitriano please show your compiler output. Both c++1z and c++17 should work in Qt 5.12 upwards. For version < 5.12, you need to specify c++17.

                  Qt has to stay free or it will die.

                  1 Reply Last reply Reply Quote 0
                  • D
                    Dmitriano @J.Hilk last edited by Dmitriano

                    @J.Hilk @aha_1980
                    Something went wrong after switching from 5.12 to 5.13. Probably I selected a wrong configuration 'VS2017 Desktop 64bit'. If I select 'Desktop Qt 5.13 MSVS2017 64bit' the project compiles.

                    1 Reply Last reply Reply Quote 1
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