'CONFIG += c++17' does not take an effect in .pro file.
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I have
CONFIG += c++17in 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.
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hi @Dmitriano
take a look at this bug report
https://bugreports.qt.io/browse/QTBUG-67527seems like c++1z is the way to go.
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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).
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@Dmitriano did you make a complete rebuild of your project, clean -> qmake -> make?
Changing the pro file will require a complete recreation
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@J.Hilk
yes I replaced#CONFIG += c++17 CONFIG += c++1zremoved the build directory and rebuilt the project.
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@Dmitriano
well I#m out of ideas,according to this reference
https://doc.qt.io/qt-5/qmake-variable-reference.htmlit should work, if your compiler supports it.
I would assume, that MSVC2017 does indeed support c++17 😟
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@Dmitriano please show your compiler output. Both
c++1zandc++17should work in Qt 5.12 upwards. For version < 5.12, you need to specifyc++17.
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@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.
