Build fails on compilation of Julia bindings -- `Mirrored types (marked with IsMirroredType) can't be added`

[dfenn]

System Information

OpenCV version: 4.8.0
Operating System / Platform: Ubuntu 22.04.2 LTS (WSL2)
Compiler & compiler version: GCC 11.3.0

Detailed description

Error while compiling Julia bindings (using CxxWrap version 0.9.7):

In file included from <path>/libcxxwrap-julia/include/jlcxx/jlcxx.hpp:15,
                 from <path>/opencv-4.8.0/build/modules/julia/gen/autogen_cpp/cv_core.cpp:7:
<path>/libcxxwrap-julia/include/jlcxx/module.hpp: In instantiation of ‘jlcxx::TypeWrapper<T> jlcxx::Module::add_type_internal(const string&, JLSuperT*) [with T = cv::RotatedRect; SuperParametersT = jlcxx::ParameterList<>; JLSuperT = _jl_datatype_t; std::string = std::__cxx11::basic_string<char>]’:
<path>/libcxxwrap-julia/include/jlcxx/module.hpp:1222:48:   required from ‘jlcxx::TypeWrapper<T> jlcxx::Module::add_type(const string&, JLSuperT*) [with T = cv::RotatedRect; SuperParametersT = jlcxx::ParameterList<>; JLSuperT = _jl_datatype_t; std::string = std::__cxx11::basic_string<char>]’
<path>/opencv-4.8.0/build/modules/julia/gen/autogen_cpp/cv_core.cpp:246:30:   required from here
<path>/libcxxwrap-julia/include/jlcxx/module.hpp:1144:17: error: static assertion failed: Mirrored types (marked with IsMirroredType) can't be added using add_type, map them directly to a struct instead and use map_type or explicitly disable mirroring for this type, e.g. define template<> struct IsMirroredType<Foo> : std::false_type { };

Could possibly be related to this CxxWrap issue, but I'm not familiar enough with the code to say: JuliaInterop/CxxWrap.jl#271

Steps to reproduce

I built CxxWrap following the instructions here: https://docs.opencv.org/4.x/d8/da4/tutorial_julia.html. That all completed successfully.

I configured OpenCV using -D WITH_JULIA=ON.

The build failed.

Issue submission checklist

• I report the issue, it's not a question
• I checked the problem with documentation, FAQ, open issues, forum.opencv.org, Stack Overflow, etc and have not found any solution
• I updated to the latest OpenCV version and the issue is still there
• There is reproducer code and related data files (videos, images, onnx, etc)

[asmorkalov]

The issue transferred to opencv_contrib as all Julia related things are hosted there.

[asmorkalov]

@archit120 Could you take a look on it?

[ooxx-tw]

Hi,
I have similar problem.
environment:
Ubuntu 22.04
....
-- Found Julia executable: /home/User/julia/bin/julia
-- Julia_VERSION_STRING: 1.6.7
-- Julia_INCLUDE_DIRS: /home/User/julia/include/julia
-- Julia_LIBRARY_DIR: /home/User/julia/lib
-- Julia_LIBRARY: /home/User/julia/lib/libjulia.so.1
-- JULIA_HOME: /home/User/julia/bin
-- Julia_LLVM_VERSION: v11.0.1
-- Julia_WORD_SIZE: 64
-- JlCxx_DIR: /home/User/.julia/artifacts/c26cbccbc5075a22f2b34a08dd9c9ad52d58f381/lib/cmake/JlCxx
....

Consolidate compiler generated dependencies of target opencv_julia
[ 89%] Building CXX object modules/julia/CMakeFiles/opencv_julia.dir/gen/autogen_cpp/cv_core.cpp.o
In file included from /home/User/.julia/artifacts/c26cbccbc5075a22f2b34a08dd9c9ad52d58f381/include/jlcxx/jlcxx.hpp:15,
from /home/User/opencv/build/modules/julia/gen/autogen_cpp/cv_core.cpp:7:
/home/User/.julia/artifacts/c26cbccbc5075a22f2b34a08dd9c9ad52d58f381/include/jlcxx/module.hpp: In instantiation of ‘jlcxx::TypeWrapper jlcxx::Module::add_type_internal(const string&, JLSuperT*) [with T = cv::RotatedRect; SuperParametersT = jlcxx::ParameterList<>; JLSuperT = _jl_datatype_t; std::string = std::__cxx11::basic_string]’:
/home/User/.julia/artifacts/c26cbccbc5075a22f2b34a08dd9c9ad52d58f381/include/jlcxx/module.hpp:1222:48: required from ‘jlcxx::TypeWrapper jlcxx::Module::add_type(const string&, JLSuperT*) [with T = cv::RotatedRect; SuperParametersT = jlcxx::ParameterList<>; JLSuperT = _jl_datatype_t; std::string = std::__cxx11::basic_string]’
/home/User/opencv/build/modules/julia/gen/autogen_cpp/cv_core.cpp:246:30: required from here
/home/User/.julia/artifacts/c26cbccbc5075a22f2b34a08dd9c9ad52d58f381/include/jlcxx/module.hpp:1144:17: error: static assertion failed: Mirrored types (marked with IsMirroredType) can't be added using add_type, map them directly to a struct instead and use map_type or explicitly disable mirroring for this type, e.g. define template<> struct IsMirroredType : std::false_type { };
1144 | static_assert(!IsMirroredType::value, "Mirrored types (marked with IsMirroredType) can't be added using add_type, map them directly to a struct instead and use map_type or explicitly disable mirroring for this type, e.g. define template<> struct IsMirroredType : std::false_type { };");
| ^~~~~~~~~~~~~~~~~~~~~~~~~
/home/User/.julia/artifacts/c26cbccbc5075a22f2b34a08dd9c9ad52d58f381/include/jlcxx/module.hpp:1144:17: note: ‘!(bool)std::integral_constant<bool, true>::value’ evaluates to false
make[2]: *** [modules/julia/CMakeFiles/opencv_julia.dir/build.make:90: modules/julia/CMakeFiles/opencv_julia.dir/gen/autogen_cpp/cv_core.cpp.o] Error 1
make[1]: *** [CMakeFiles/Makefile2:7512: modules/julia/CMakeFiles/opencv_julia.dir/all] Error 2
make: *** [Makefile:166: all] Error 2