1.按下开关Clang

sudo apt-get install Clang

2.编写测试程序  memleak.c

#include<stdio.h>

#include<stdlib.h>

int main()

{

    int *mem;

    mem=malloc(sizeof(int));

    if(mem) return 1;

    *mem=0xdeadbeaf;

    free(mem);

    return 0;

}

3. 执行代码静态检查

scan-build -o memleak gcc memleak.c -o m

结果例如以下:

memleak.c:9:5: warning: Dereference of null pointer (loaded from variable 'mem')

    *mem=0xdeadbeaf;

    ^~~~

1 warning generated.

scan-build: 1 bugs found.

4.在当前目录下会生存一个 memleak目录，内有一个以日期命名的目录，用浏览器打开该目录内的 index.html 查看错误bug报告

5.改动 memleak.c

#include<stdio.h>

#include<stdlib.h>

int main()

{

    int *mem;

    mem=malloc(sizeof(int));

    if(mem==NULL) return 1;

    *mem=0xdeadbeaf;

    free(mem);

    return 0;

}

6.再次执行 scan-build -o memleak gcc memleak.c -o m

7. 此时bug消失

8. 下载开源 cgdb http://cgdb.github.io/

9.切换到 cgdb 所在文件夹，执行 scan-build -o cgdb-scan ./configure --prefix=$PWD/build

10. 执行 scan-build -o cgdb-scan make

11.用浏览器打开当前文件夹下 cgdb-scan 下的 index.html 查看 bug 报告

參考文献

http://events.linuxfoundation.org/images/stories/pdf/lcjp2012_matsumotoh.pdf

http://clang-analyzer.llvm.org/scan-build.html

http://www.hackhowtofaq.com/blog/static-analysis-with-llvm-clang-in-linux/