###### tags: `makefile`
# makefile

---

## makefile frist rule
#### default rule
分成三個部分
1.target --> file or something
2.prerequisite --> already exist file
3.command --> shell command

target: prereq1 prereq2
    commands

Example

foo.o: foo.c foo.h
    gcc -c foo.c

## makefile 風格
#### two-phase execution model
#### recursive variable

## make 分析 makefile 工作流程
**從target到prerequisite,從prerequisite到target,再從target到prerequisite**
叫做 chaining 典型執行那些命令地的做法。

## make -l rule

## -l<filename>
gcc main.c -o -ldai

make 先搜尋 dai.so file
if not exist then
search dai.a file