Makefile特殊字符的含义和用法

Question

以下字符在Makefile中的含义是什么？

$ @，$？ ，$ *，$＆lt; ，$ ^

我已经看到了一些解释，但我并没有完全明白如何使用它。

Answer 1

使用模式和特殊变量

When wildcard % appears in the dependency list, it is replaced with 
the same string that was used to perform substitution in the target.

Inside actions we can use:  
    $@ to represent the full target name of the current target  
    $? returns the dependencies that are newer than the current target  
    $* returns the text that corresponds to % in the target     
    $< returns the name of the first dependency 
    $^ returns the names of all the dependencies with space as the delimiter

如需进一步说明，请参阅This github link