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Qt 6.2.2 Webassembly - sign conversion errors

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  • A Offline
    A Offline
    AxelVienna
    wrote on 21 Dec 2021, 07:57 last edited by
    #1

    Hi,
    I am trying to port a Qt 6.2.2 C++ application to Webassembly on OpenSuSE Leap 15.3. Compilation as an executable works just fine. When I try to compile with emscripten (version 2.0.14 as requested according to the documentation), I get a lot of signbit and type conversion errors.
    It looks to me that the 9er subtree (equivalent to /usr/include/c++/9) is not available in the ...cache/sysroot/include/c++ tree of the emscripten installation. In this path, I find only the v1 subdir which to me looks like the problem.
    Thanks for your help and kind regards
    Axel

    Two examples of error messages below

    In file included from ../WhiteEngine/WhiteIncludes.h:14:
    In file included from /opt/Qt/6.2.2/wasm_32/include/QtCore/QDateTime:1:
    In file included from /opt/Qt/6.2.2/wasm_32/include/QtCore/qdatetime.h:44:
    In file included from /opt/Qt/6.2.2/wasm_32/include/QtCore/qstring.h:50:
    In file included from /opt/Qt/6.2.2/wasm_32/include/QtCore/qchar.h:43:
    In file included from /opt/Qt/6.2.2/wasm_32/include/QtCore/qglobal.h:1430:
    In file included from /opt/Qt/6.2.2/wasm_32/include/QtCore/qnumeric.h:44:
    /home/mnt/axel/CloudStation/download/emsdk/upstream/emscripten/cache/sysroot/include/c++/v1/cmath:317:9: error: no member named 'signbit' in the global namespace; did you mean '__signbit'?
    using ::signbit;
          ~~^
    /usr/include/bits/mathcalls-helper-functions.h:25:20: note: '__signbit' declared here
    __MATHDECL_1 (int, __signbit,, (_Mdouble_ __value))
    
    In file included from ../WhiteEngine/WhiteIncludes.h:6:
    In file included from /home/mnt/axel/CloudStation/download/emsdk/upstream/emscripten/cache/sysroot/include/c++/v1/iostream:37:
    In file included from /home/mnt/axel/CloudStation/download/emsdk/upstream/emscripten/cache/sysroot/include/c++/v1/ios:215:
    In file included from /home/mnt/axel/CloudStation/download/emsdk/upstream/emscripten/cache/sysroot/include/c++/v1/__locale:14:
    In file included from /home/mnt/axel/CloudStation/download/emsdk/upstream/emscripten/cache/sysroot/include/c++/v1/string:504:
    In file included from /home/mnt/axel/CloudStation/download/emsdk/upstream/emscripten/cache/sysroot/include/c++/v1/string_view:175:
    In file included from /home/mnt/axel/CloudStation/download/emsdk/upstream/emscripten/cache/sysroot/include/c++/v1/__string:57:
    In file included from /home/mnt/axel/CloudStation/download/emsdk/upstream/emscripten/cache/sysroot/include/c++/v1/algorithm:643:
    In file included from /home/mnt/axel/CloudStation/download/emsdk/upstream/emscripten/cache/sysroot/include/c++/v1/memory:653:
    /home/mnt/axel/CloudStation/download/emsdk/upstream/emscripten/cache/sysroot/include/c++/v1/typeinfo:221:16: error: reinterpret_cast from 'std::__type_info_implementations::__non_unique_arm_rtti_bit_impl::__type_name_t' (aka 'unsigned int') to 'size_t' (aka 'unsigned long') is not allowed
            return reinterpret_cast<size_t>(__v);
    
    

    C++ and Python walk into a bar. C++ reuses the first glass.

    K 1 Reply Last reply 22 Dec 2021, 00:24
    0
    • A AxelVienna
      21 Dec 2021, 07:57

      Hi,
      I am trying to port a Qt 6.2.2 C++ application to Webassembly on OpenSuSE Leap 15.3. Compilation as an executable works just fine. When I try to compile with emscripten (version 2.0.14 as requested according to the documentation), I get a lot of signbit and type conversion errors.
      It looks to me that the 9er subtree (equivalent to /usr/include/c++/9) is not available in the ...cache/sysroot/include/c++ tree of the emscripten installation. In this path, I find only the v1 subdir which to me looks like the problem.
      Thanks for your help and kind regards
      Axel

      Two examples of error messages below

      In file included from ../WhiteEngine/WhiteIncludes.h:14:
      In file included from /opt/Qt/6.2.2/wasm_32/include/QtCore/QDateTime:1:
      In file included from /opt/Qt/6.2.2/wasm_32/include/QtCore/qdatetime.h:44:
      In file included from /opt/Qt/6.2.2/wasm_32/include/QtCore/qstring.h:50:
      In file included from /opt/Qt/6.2.2/wasm_32/include/QtCore/qchar.h:43:
      In file included from /opt/Qt/6.2.2/wasm_32/include/QtCore/qglobal.h:1430:
      In file included from /opt/Qt/6.2.2/wasm_32/include/QtCore/qnumeric.h:44:
      /home/mnt/axel/CloudStation/download/emsdk/upstream/emscripten/cache/sysroot/include/c++/v1/cmath:317:9: error: no member named 'signbit' in the global namespace; did you mean '__signbit'?
      using ::signbit;
            ~~^
      /usr/include/bits/mathcalls-helper-functions.h:25:20: note: '__signbit' declared here
      __MATHDECL_1 (int, __signbit,, (_Mdouble_ __value))
      
      In file included from ../WhiteEngine/WhiteIncludes.h:6:
      In file included from /home/mnt/axel/CloudStation/download/emsdk/upstream/emscripten/cache/sysroot/include/c++/v1/iostream:37:
      In file included from /home/mnt/axel/CloudStation/download/emsdk/upstream/emscripten/cache/sysroot/include/c++/v1/ios:215:
      In file included from /home/mnt/axel/CloudStation/download/emsdk/upstream/emscripten/cache/sysroot/include/c++/v1/__locale:14:
      In file included from /home/mnt/axel/CloudStation/download/emsdk/upstream/emscripten/cache/sysroot/include/c++/v1/string:504:
      In file included from /home/mnt/axel/CloudStation/download/emsdk/upstream/emscripten/cache/sysroot/include/c++/v1/string_view:175:
      In file included from /home/mnt/axel/CloudStation/download/emsdk/upstream/emscripten/cache/sysroot/include/c++/v1/__string:57:
      In file included from /home/mnt/axel/CloudStation/download/emsdk/upstream/emscripten/cache/sysroot/include/c++/v1/algorithm:643:
      In file included from /home/mnt/axel/CloudStation/download/emsdk/upstream/emscripten/cache/sysroot/include/c++/v1/memory:653:
      /home/mnt/axel/CloudStation/download/emsdk/upstream/emscripten/cache/sysroot/include/c++/v1/typeinfo:221:16: error: reinterpret_cast from 'std::__type_info_implementations::__non_unique_arm_rtti_bit_impl::__type_name_t' (aka 'unsigned int') to 'size_t' (aka 'unsigned long') is not allowed
              return reinterpret_cast<size_t>(__v);
      
      
      K Offline
      K Offline
      kshegunov
      Moderators
      wrote on 22 Dec 2021, 00:24 last edited by
      #2

      Without having the faintest of clues about the actual problem, at a glance it looks to me like some missing/incomplete/bogus library support issue. I suggest you bring this to the mailing list, we don't get much traffic for wasm here.

      Read and abide by the Qt Code of Conduct

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      21 Dec 2021, 07:57

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