How can the code "create_hex" work in bootloader's cmakelists?

[ZHENGXIANG]

From the cmakelists of bootloader in Meshv320src, I found the code "create_hex" but this code cannot found in CMake's document. How can it work to generate the hex file?

[ZHENGXIANG]

Thank you for your answer. I have found the mistake. I forgot to change the bootloader_build from OFF to ON in cmakecache.txt. Now I successfully generate the hex file for bootloader.