# sanos 完备的小系统，类linux，所有东西都是自己实现的。 https://github.com/ringgaard/sanos ## Build system 1. 开始是用 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 关键是为了产生target，比较dependency target的时间，决定是否要build。 依次运行commands。 1. parser rule = (target, dependencies, commands) 2. check target, compare with dependency time, build target list 3. build target ## chgrp