table of Contents:
一.make && makefile
1. Make automated interpreter, makefile is a file
2. Interpret the makefile through make to build an executable program
3. The rules of the makefile file
• Target object: what executable program needs to be generated, or the target program (.o)
• Dependent object: When generating the target object, the dependent file
• Compilation command: How to use the dependent object to generate the target
4. Makefile file format:
5. Make explains the principles of makefile. If you want to generate multiple target objects, you can do as follows: 6. Predefined variables $^: all dependent objects $@: target objects 7. Makefile cleanup: Want to Delete the generated target object -> clean 8. Variables can also be customized in the makefile
make解释器在解释makefile的时候，会对比依赖对象(源文件)和目标对象(可执行程序)的生成时间
如果目标对象(可执行程序)生成的时间距离现在较近，说明目标对象是最新的，不需要重新编译
(time - 目标对象的生成时间) < (time - 依赖对象的生成时间)
如果依赖对象(源文件)生成的时间距离现在比较近，说明依赖对象(源码文件)更改过，需要重新编译
(time - 目标对象的生成时间) > (time - 依赖对象的生成时间)
make只为生成第一个目标对象，一旦make解释生成了第一个目标对象，则停止解释
make解释器在解释makefile的时候，为了生成第一个目标对象，也会判断第一个目标对象依赖的对象是否存在，
如果不存在，则会在makefile后续的语句当中查找生成依赖对象的方法，先将依赖对象生成，在使用依赖对象，
将第一个目标对象生成
2. Git version management tool
1. Clone the warehouse
git clone "repository url"
2. Upload
2.1 Mark: Tell the git tool to manage those files
git add [filename]/*
2.2 Submit to the local warehouse
git commit -m "Submit log and why upload"
2.3 Push to remote warehouse
git push origin master
3. Delete the content in the warehouse
Local warehouse content + remote warehouse content
git rm "file"
git commit -m "commit log"
git push origin master
4. Download the source code from the remote warehouse
git pull