首先我们要下载两个压缩包， 可以从下面的网站上下载， 也可以从文章的附件下载。

• http://gmsl.sf.net/
• http://gmd.sf.net/

压缩包下载完之后解压。

• 把gmd压缩包下的gmd文件
• 把gmsl压缩包下的gmsl和__gmsl文件拿出来

上面一共三个文件，放到当前Makefile文件夹下面, 下面是当前文件夹下的内容

-rw-r--r-- 1 root root 9.8K Apr 27 09:37 gmd
-rw-r--r-- 1 root root  45K Apr 27 09:37 __gmsl
-rw-r--r-- 1 root root 3.0K Apr 27 09:37 gmsl
-rw-r--r-- 1 root root   93 Apr 27 09:38 Makefile

Makeile修改

• 引入 include gmd
• 在合适的位置插入断点 $(__BREAKPOINT) 运行makefile时，程序会在断点处停止，等待输入指令

include gmd
name=1
$(__BREAKPOINT)
test1:
    @echo test1
test2:
    @echo test2
test: test1 test2

运行Makefile之后，会进入等待输出阶段：

• 输入h, 按回车，显示帮助信息
• 输入v VAR, 显示变量的值，例子中v name, 就是打印name的值，可以看出打印了变量1

Makefile:3: GNU Make Debugger Break
1> h
Makefile:3: c:     continue
Makefile:3: q:     quit
Makefile:3: v VAR: print value of $(VAR)
Makefile:3: o VAR: print origin of $(VAR)
Makefile:3: d VAR: print definition of $(VAR)
Makefile:3: b TAR: set a breakpoint on target TAR
Makefile:3: r TAR: unset breakpoint on target TAR
Makefile:3: l:     list all target breakpoints
2> v name
Makefile:3: name has value '1'

参考

• https://elinux.org/Debugging_Makefiles#:~:text=%20Debugging%20Makefiles%20%201%20showing%20symbol%20values%2C,sources%2C%20and%20there%20is%20another%20based…%20More%20
• https://www.cmcrossroads.com/article/dynamic-breakpoints-gnu-make-debugger

gmsl-1.1.9.tar.gz
gmd-1.0.3.tar.gz