def METHOD_NAME(self):
    # check to see if full path already configured
    if shell_environment.GetEnvironment().get_shell_var("GCC5_LOONGARCH64_PREFIX") is not None:
        self.Logger.info("GCC5_LOONGARCH64_PREFIX is already set.")
    else:
        # now check for install dir.  If set then set the Prefix
        install_path = shell_environment.GetEnvironment(
        ).get_shell_var("GCC5_LOONGARCH64_INSTALL")
        if install_path is None:
            return 0
        # make GCC5_LOONGARCH64_PREFIX to align with tools_def.txt
        prefix = os.path.join(install_path, "bin", "loongarch64-unknown-linux-gnu-")
        shell_environment.GetEnvironment().set_shell_var("GCC5_LOONGARCH64_PREFIX", prefix)
    # now confirm it exists
    if not os.path.exists(shell_environment.GetEnvironment().get_shell_var("GCC5_LOONGARCH64_PREFIX") + "gcc"):
        self.Logger.error(
            "Path for GCC5_LOONGARCH64_PREFIX toolchain is invalid")
        return -2
    return 0