Code::Blocks and Armadillo Linking: cannot find -lopenblas.lib

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If you are encountering a linking error in Code::Blocks related to the "cannot find -lopenblas.lib" library, it indicates that the linker is unable to locate the OpenBLAS library that is required by the Armadillo library. Here's how you can resolve the issue:

  1. Ensure OpenBLAS is Installed:

    • Verify that you have installed the OpenBLAS library on your system. You can download the OpenBLAS library from the official website or install it using a package manager specific to your operating system.

  2. Specify the Library Path:

    • In Code::Blocks, go to the project build options.
    • Under the "Linker settings" or "Linker options" section, add the path to the OpenBLAS library directory to the "Library directories" or "Additional library directories" field. This is the directory where the OpenBLAS library files (including openblas.lib) are located.

  3. Link OpenBLAS Library:

    • In the same project build options, locate the "Link libraries" or "Linker libraries" field.
    • Add openblas to the list of libraries to link against. This tells the linker to include the OpenBLAS library during the build process.

  4. Verify Library Names:

    • Double-check the library names and file extensions. On Windows, the library file for OpenBLAS may have a different extension like .lib or .a instead of .so. Make sure the library names and file extensions match the ones installed on your system.

  5. Rebuild and Test:

    • Save the changes in the project build options and rebuild your project in Code::Blocks. Ensure that the build process completes successfully without any "cannot find" errors related to openblas.lib.

By following these steps, you should be able to resolve the "cannot find -lopenblas.lib" linking error in Code::Blocks and successfully link the Armadillo library with the OpenBLAS dependency.