Error building LLVM on Windows - LNK1104

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The "LNK1104" error in Visual Studio typically indicates that the linker cannot find a specified library file. In the context of building LLVM on Windows, this error can occur due to a variety of reasons. Here are some steps you can take to troubleshoot and resolve the issue:

  1. Check Dependencies:
    Make sure you have installed all the required dependencies and tools for building LLVM on Windows. Follow the official LLVM documentation for Windows to ensure you have the necessary prerequisites.

  2. Check Environment Variables:
    Ensure that the necessary environment variables, such as PATH and LIB, are correctly set to include the paths to required libraries and tools. Double-check that you have correctly set up the necessary paths for Visual Studio, CMake, and other tools involved in the build process.

  3. Check Configuration:
    Verify that you have configured LLVM's build process correctly using CMake. Make sure you've specified the appropriate options and paths for libraries, headers, and tools.

  4. Check Project Properties:
    If you are building LLVM using Visual Studio, open the solution in Visual Studio and check the project properties. Ensure that the library directories and library names are correctly specified in the project properties.

  5. Library Paths and Names:
    The "LNK1104" error often indicates that the linker cannot find a specified library file. Double-check that the library files are present in the specified library directories and that the library names are correctly spelled.

  6. Library File Permissions:
    Ensure that the library files are not locked or inaccessible due to permissions issues. Make sure you have read and execute permissions for the required library files.

  7. Build Directory Clean-Up:
    Sometimes, remnants from previous build attempts can cause issues. Try deleting the build directory and generating a fresh build using CMake.

  8. Disk Space:
    Check if you have sufficient disk space available in the build directory and any temporary directories used during the build process.

  9. Firewall and Antivirus:
    In some cases, security software or firewalls might interfere with the build process. Temporarily disabling such software while building LLVM might help identify if this is the cause.

  10. Update Visual Studio:
    Make sure you are using a compatible version of Visual Studio for building LLVM. Updating Visual Studio to the latest version might resolve compatibility issues.

  11. Build Configuration:
    Ensure that you are building the correct configuration (e.g., Debug or Release) and platform (e.g., x64 or Win32) that you intend to build.

  12. Internet Connectivity:
    Some parts of the LLVM build process might require an internet connection to download additional files or dependencies. Make sure you have a stable internet connection during the build.

  13. Check Build Logs:
    Review the build logs for more specific information about which library or module is causing the "LNK1104" error. This can help narrow down the issue.

If you've tried these steps and are still encountering the error, please provide more details about your build environment, the steps you've taken, and any specific error messages or logs you're encountering. This information will help in providing more targeted assistance.