Qt command line compilation fails at linker stage with garbage NXCOMPAT data

  • 9 months ago
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The "garbage NXCOMPAT data" error during the linker stage in Qt command line compilation is a common issue that occurs when trying to link an executable that was compiled with one version of the Microsoft Visual C++ compiler (MSVC) against libraries or object files compiled with a different version of the MSVC compiler.

Here are some steps you can take to resolve this issue:

  1. Use Consistent MSVC Versions: Ensure that all the libraries, object files, and the Qt framework itself are compiled using the same version of the MSVC compiler. Mixing different versions can lead to compatibility issues.

  2. Check Qt Version: Make sure that the version of Qt you are using is compatible with the version of MSVC you are using. Qt releases are often distributed with pre-built binaries for specific versions of MSVC. Using a mismatched version can lead to compatibility problems.

  3. Check Compiler Flags: Ensure that the compiler flags you are using are consistent across all compilation steps. Inconsistent compiler flags can lead to conflicting binary formats.

  4. Recompile Dependencies: If you are linking against external libraries, make sure that those libraries are also compiled using the same MSVC version as your project.

  5. Clean and Rebuild: Sometimes the linker errors can occur due to leftover object files or cached data. Try cleaning your project (deleting intermediate files) and then rebuilding from scratch.

  6. Check Environment Variables: Verify that your environment variables, such as the PATH and LIB variables, are correctly set up to point to the appropriate MSVC version and Qt installation.

  7. Reinstall Qt: If you suspect that the Qt installation is not properly configured or there might be inconsistencies, consider reinstalling Qt using the appropriate installer for your version of MSVC.

  8. Check Library Paths: Ensure that you are linking against the correct libraries and that their paths are correctly specified in your project configuration.

  9. Dependency Analyzer: Consider using tools like Dependency Walker or dumpbin to analyze the libraries and object files to ensure they are using the same MSVC version.

  10. Check Qt Creator: If you are using Qt Creator for compilation, make sure that the kit (compiler) you have selected matches the version of MSVC you are using.

  11. Check Qt Modules: Be cautious if you are using specific Qt modules that might have dependencies on certain MSVC runtime versions. Some modules require specific runtime libraries to work correctly.

Resolving this issue may require a combination of the above steps. It's important to maintain consistency in terms of compiler versions, library versions, and compiler flags across all stages of your project's compilation and linking process.