Cross Platform build fails with undefined reference

 When you encounter an "undefined reference" error in a C# project during cross-platform build, it's important to understand that this error is more common in C and C++ development where you're dealing with native code and libraries. In C#, you don't typically encounter "undefined reference" errors unless you're doing interop with native code, such as C/C++ or using P/Invoke.


Here are some common reasons why you might see an "undefined reference" error in C#:


1. **P/Invoke Issue**: If you are using P/Invoke to call native functions from a shared library (DLL or SO file), make sure that the native library is available and properly referenced. The error could occur if the library or function you are trying to reference doesn't exist, or the library is not being found.


2. **Missing Dependency**: Ensure that all required dependencies, such as shared libraries or native assemblies, are available and accessible on the target platform.


3. **Mismatched Platform**: If you are targeting multiple platforms, make sure that the native libraries you are using are compatible with each of those platforms. Different platforms might have different versions or implementations of the libraries.


4. **Build Configuration**: Check your build configurations and settings for platform-specific issues. For example, make sure you are referencing the correct libraries and using the right compiler flags for your target platform.


5. **Versioning Issues**: In some cases, you might run into "undefined reference" errors due to versioning problems, especially when working with platform-specific libraries.


To troubleshoot this issue, it's important to check the specific error message and context. The error message should provide details about which reference is undefined. You can then focus on addressing the missing reference, be it a native library or other dependencies. Additionally, ensure that your cross-platform development environment and configurations are set up correctly for your target platforms.

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