The article provides a comprehensive guide on cross-compiling a simple C++ program for ARM64 devices using CMake and GCC. It details the installation of necessary tools like GNU Make, GCC, and cross-compilers, as well as the setup of a cross-compilation environment by using an Ubuntu ARM64 image to obtain the required root file system. The process of creating and compiling a C++ program is explained step-by-step, including compiling with g++, Make, and CMake, and testing the resulting executable on an ARM64 platform. Troubleshooting common cross-compilation issues such as compiler incompatibility and toolchain conflicts is covered, with tips on ensuring the correct configuration and dependencies. The tutorial concludes with suggestions for further resources and tools like Earthly to simplify the cross-compilation process, and it highlights the importance of using the right toolchain and configurations to achieve successful builds.