How to Fix the 'Mismatch Detected for 'RuntimeLibrary'' Error in Visual Studio?

Resolving "Mismatch Detected for 'RuntimeLibrary'" Error in Visual Studio

This error occurs when linking multiple code units with different versions of the C Run-Time (CRT) library. To resolve it:

1. Adjust Runtime Library Settings:

   Ensure that all code units and libraries being linked use the same Runtime Library setting. Go to Project Properties > C/C > Code Generation and set Runtime Library to either Multithreaded Debug or Multithreaded Debug DLL for both your program and the Crypto library.

2. Validate Debug/Release Configurations:

   Verify that the Runtime Library settings are consistent across debug and release builds. Build configurations use different project settings, so check each one to ensure compatibility.

3. Beware of DLL Mixing:

   Mixing static and dynamic CRT versions can be problematic. If you link against a static CRT library, ensure that your program also uses a static CRT. Conversely, if using a dynamic CRT library, use a dynamic CRT in your program as well.

4. Avoid Object Size Mismatches:

   Mixing code units compiled against different CRT versions leads to object size discrepancies. This can cause issues when one code unit passes objects to another that expects different object sizes. Ensure all code units use the same CRT runtime to avoid these mismatches.

5. Exceptions to the Rule:

   In some cases, you can link code units compiled against different CRT versions without causing issues. However, these exceptional cases require careful consideration and thorough testing. It is generally recommended to maintain consistency for reliability.

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