lcov for linux 使用

1. 首先安装lcov，我安装的版本是lcov-1.9
   

2. 写一个app.c文件，代码如下：

   #include
   #include
   #include
   void main()
   {
    int a=3;
    int b=4;
    int c=5;
   
    if(a>b&&a>c)//判断a 是不是最大
    {
     if(b>c)
     {
      printf("a>b>c");
     }else
     {
      printf("a>c>b");
     }
    }
    else if(b>a&&b>c)//判断b 是不是最大
    {
      if(a>c)
     {
      printf("b>a>c");
     }else
     {
      printf("b>c>a");
     }
    }
    else if(c>b&&c>a)//判断 c 是不是最大
    {
      if(a>b)
     {
      printf("c>a>b");
     }else
     {
      printf("c>b>a");
     }
    }
   }
   

3. [root@localhost Test]# gcc -fprofile-arcs -ftest-coverage -o myappaa app.c
   

4. [root@localhost Test]# ./myapp

5. [root@localhost Test]# gcov app.c
   File 'app.c'
   Lines executed:58.82% of 17
   app.c:creating 'app.c.gcov'

6. [root@localhost Test]# ls
   app.c  app.c.gcov  app.gcda  app.gcno  myapp

7. [root@localhost Test]# lcov -d ./ -o myapp.info -b . -c
   Capturing coverage data from ./
   Found gcov version: 4.4.7
   Scanning ./ for .gcda files ...
   Found 1 data files in ./
   Processing app.gcda
   Finished .info-file creation

8. [root@localhost Test]# ls
   app.c  app.gcda  app.gcno  myapp  myapp.info

9. [root@localhost Test]# genhtml -o myapp_restul myapp.info
   Reading data file myapp.info
   Found 1 entries.
   Found common filename prefix "/opt"
   Writing .css and .png files.
   Generating output.
   Processing file zhaogh/Test/app.c
   Writing directory view page.
   Overall coverage rate:
     lines......: 58.8% (10 of 17 lines)
     functions..: 100.0% (1 of 1 function)
     branches...: 33.3% (6 of 18 branches)

10. sz myapp_restul

11. 然后打开index就可以查看到代码执行的覆盖率了

12.