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  1. Qt for MCUs
  2. QTMCU-177

qmlinterfacegenerator fails when the project uses a newer C++ standard

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    • 8e78c60bda9430fc9a43e9a1f70ca8d1ed7a261b, eae2d2a49dee374d3a6f7340fffae7d74d7c79ae

    Description

      Attached a modified image_loading example. The example is extended to use C++17 for the complete example.

      While that works great for the main.cpp, it doesn't work when it is used inside a C++ class (myitem.h) and exposed to QML using qul_target_generate_interfaces.

      MyItem is using std::optional a feature which got introduced in C++17.

      The example cannot be compiled and fails with the following error:

      _qul_dummy_myitem.h && /home/gagi/Qt/QtMCUs/2.5.0/bin/qmlinterfacegenerator -xc++ /home/gagi/Qt/QtMCUs/2.5.0/examples/image_loading/myitem.h -resource-dir="/home/gagi/Qt/QtMCUs/2.5.0/lib/clang/13.0.1" -I/home/gagi/Qt/QtMCUs/2.5.0/examples/image_loading -I/home/gagi/Qt/QtMCUs/2.5.0/examples/build-image_loading-Qt_for_MCUs_2_5_STM32F769I_DISCOVERY_BAREMETAL_32bpp_ARMGCC-Debug/CMakeFiles/image_loading.dir -I/home/gagi/Qt/QtMCUs/2.5.0/examples/build-image_loading-Qt_for_MCUs_2_5_STM32F769I_DISCOVERY_BAREMETAL_32bpp_ARMGCC-Debug/src/controls -I/home/gagi/Qt/QtMCUs/2.5.0/examples/image_loading -I/home/gagi/Qt/QtMCUs/2.5.0/examples/build-image_loading-Qt_for_MCUs_2_5_STM32F769I_DISCOVERY_BAREMETAL_32bpp_ARMGCC-Debug/CMakeFiles/image_loading.dir -I/home/gagi/Qt/QtMCUs/2.5.0/examples/build-image_loading-Qt_for_MCUs_2_5_STM32F769I_DISCOVERY_BAREMETAL_32bpp_ARMGCC-Debug//CMakeFiles/image_loading.dir/ -I/home/gagi/Qt/QtMCUs/2.5.0/examples/build-image_loading-Qt_for_MCUs_2_5_STM32F769I_DISCOVERY_BAREMETAL_32bpp_ARMGCC-Debug/CMakeFiles/image_loading.dir -I/home/gagi/Qt/QtMCUs/2.5.0/examples/build-image_loading-Qt_for_MCUs_2_5_STM32F769I_DISCOVERY_BAREMETAL_32bpp_ARMGCC-Debug/src/controls -I/home/gagi/Qt/QtMCUs/2.5.0/examples/image_loading -I/home/gagi/Qt/QtMCUs/2.5.0/examples/build-image_loading-Qt_for_MCUs_2_5_STM32F769I_DISCOVERY_BAREMETAL_32bpp_ARMGCC-Debug/CMakeFiles/image_loading.dir -I/home/gagi/Qt/QtMCUs/2.5.0/examples/build-image_loading-Qt_for_MCUs_2_5_STM32F769I_DISCOVERY_BAREMETAL_32bpp_ARMGCC-Debug//CMakeFiles/Lib_image_loadin46fd.dir/ -I/home/gagi/Qt/QtMCUs/2.5.0/include/qul/Default -I/home/gagi/Qt/QtMCUs/2.5.0/include/qul/Templates -I/home/gagi/Qt/QtMCUs/2.5.0/include --target=arm-eabi-none-gnu -nostdinc -isystem/home/gagi/Qt/QtMCUs/2.5.0/bin/../src/3rdparty/gcc-arm-none-eabi-10.3-2021.10/arm-none-eabi/include/c++/10.3.1 -isystem/home/gagi/Qt/QtMCUs/2.5.0/bin/../src/3rdparty/gcc-arm-none-eabi-10.3-2021.10/arm-none-eabi/include/c++/10.3.1/arm-none-eabi -isystem/home/gagi/Qt/QtMCUs/2.5.0/bin/../src/3rdparty/gcc-arm-none-eabi-10.3-2021.10/arm-none-eabi/include/c++/10.3.1/backward -isystem/home/gagi/Qt/QtMCUs/2.5.0/bin/../src/3rdparty/gcc-arm-none-eabi-10.3-2021.10/lib/gcc/arm-none-eabi/10.3.1/include -isystem/home/gagi/Qt/QtMCUs/2.5.0/bin/../src/3rdparty/gcc-arm-none-eabi-10.3-2021.10/lib/gcc/arm-none-eabi/10.3.1/include-fixed -isystem/home/gagi/Qt/QtMCUs/2.5.0/bin/../src/3rdparty/gcc-arm-none-eabi-10.3-2021.10/arm-none-eabi/include
warning: unknown platform, assuming -mfloat-abi=soft
warning: unknown platform, assuming -mfloat-abi=soft
warning: unknown platform, assuming -mfloat-abi=soft
/home/gagi/Qt/QtMCUs/2.5.0/examples/image_loading/myitem.h:9:10: error: no template named 'optional' in namespace 'std'

      It would be great if the interefacegenerator would be called with the same flags than the all other C++ files.

      If that is not possible, adding an extra variable which enables the user to provide extra flags to the interfacegenerator would fix the problem.

      Attachments

        1. image_loading.tar.gz
          6 kB
          Dominik Holland

        Issue Links

          relates to

          Bug - A problem which impairs or prevents the functions of the product. QTMCU-265 It's not possible to use C++17 functionality from interface headers

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Closed
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              rakeller Rainer Keller
              gagi Dominik Holland
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                Created:
                Updated:
                Resolved:

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