Worked on optimizing the ARM build system for the apache/nuttx repository, focusing on improving efficiency and reliability during incremental builds. Leveraged Makefile scripting and a deep understanding of ARM architecture to refine dependency tracking, ensuring that rebuilds occurred only when actual prerequisites changed. Enhanced the build process by maintaining temporary linker scripts for accurate timestamp validation and using the FORCE pattern to guarantee that library changes triggered appropriate rebuilds. These targeted improvements reduced unnecessary relinking of the nuttx binary, resulting in faster builds, fewer redundant operations, and more stable continuous integration workflows, all achieved through precise build system optimization techniques.