Windows build crashes on Abaci library exception

[cpp-tutor]

The LLVM-generated code uses a library (lib/Abaci.cpp) to provide functionality, such as I/O, complex number calculations and type conversions. This library can throw exceptions, which are not appearing to be successfully caught by the driver under the Windows build. Things I have tried to make a working Windows build:

• Compile project, fmt and LLVM libraries with -DCMAKE_BUILD_TYPE=Release
• Compile project with flags /EHsc
• Remove extern "C" { from lib/Abaci.cpp
• Compile LLVM with -D-DLLVM_ENABLE_EH=ON -DLLVM_ENABLE_RTTI=ON which appears to set some sub-projects to use /EHsc
• Attempt to remove nounwind attribute from generated functions: current_function->addFnAttr(Attribute::UWTable);
• Add the following code to engine/JIT.cpp:

    auto JTMB = JITTargetMachineBuilder::detectHost();
    if (!JTMB) {
        errs() << "Error detecting host: " << toString(JTMB.takeError()) << "\n";
    }
    auto opts = JTMB->getOptions();
    opts.ExceptionModel = ExceptionHandling::WinEH; // Enable exception handling
    JTMB->setOptions(opts);

    jit = jit_builder.setJITTargetMachineBuilder(std::move(*JTMB)).create();

I'm guessing that all of these steps, plus other(s), are necessary, however I lack detailed knowledge of LLVM and the Windows build system. Any assistance to correct this issue would be greatly appreciated.