Standard GCC Toolchains Optimized for ARM Cortex-a7 CPUs GCC Versions: GCC 4.8.5 GCC 4.9.3 GCC 5.1 GCC 5.2.0 Allow kernel build with GCC 5.+ https://github.com/torvalds/linux/commit/71458cfc782eafe4b27656e078d379a34e472adf https://github.com/torvalds/linux/commit/51b97e354ba9fce1890cf38ecc754aa49677fc89