# sanos 完備的小系統，類linux，所有東西都是自己實現的。 https://github.com/ringgaard/sanos ## Build system 1. 開始是用 host 的 make/gcc ~~~ sanos: dirs build-tools boot sys libc utils cmds sdk # create dir make -f Makefile.linux build-tools # tool, change cc to tinycc make -f Makefile.linux dirs ls linux/tools/ ar as cc mkdfs mkpkg # bootloader make -f Makefile.linux boot # kernel make -f Makefile.linux sys sys: osldr kernel drivers os # libc utils cmds sdk ~~~ ## make 關鍵是為了產生target，比較dependency target的時間，決定是否要build。 依次運行commands。 1. parser rule = (target, dependencies, commands) 2. check target, compare with dependency time, build target list 3. build target ## chgrp