使用 gcov 生成 c 源的覆盖率，得到错误"不是 gcov 笔记文件"

Question

我正在学习gcov生成覆盖率报告。这些守则如下:a.h

#include <stdio.h>
int A(int a);

交流

#include "a.h"
int A(int a)
{
int b = a * a * a * a;
return b;
}

c

#include <stdio.h>
#include "a.h"
int main()
{
int a1 = A(33);
printf("a1 = %dn", a1);
return 1;
} 

我用gcc *.c *.h -o main -fprofile-arcs -ftest-coverage编译代码，则当前目录下的文件为a.c a.gcno a.h main main.c main.gcno。接下来,

root@DESKTOP-D0VRGT9:/home/liguoyang/coverage# lcov -d . --capture -o main.info
Capturing coverage data from .
Found gcov version: 9.3.0
Using intermediate gcov format
Scanning . for .gcda files ...
Found 2 data files in .
Processing a.gcda
/home/liguoyang/coverage/a.gcno:not a gcov notes file
/home/liguoyang/coverage/a.gcda:stamp mismatch with notes file
geninfo: WARNING: GCOV did not produce any data for /home/liguoyang/coverage/a.gcda
Processing main.gcda
Finished .info-file creation

这里我得到了一个错误

/home/liguoyang/coverage/a.gcno:not a gcov notes file
/home/liguoyang/coverage/a.gcda:stamp mismatch with notes file

和

root@DESKTOP-D0VRGT9:/home/liguoyang/coverage# genhtml -o result main.info
Reading data file main.info
Found 1 entries.
Found common filename prefix "/home/liguoyang"
Writing .css and .png files.
Generating output.
Processing file coverage/main.c
Writing directory view page.
Overall coverage rate:
lines......: 100.0% (4 of 4 lines)
functions..: 100.0% (1 of 1 function)

生成html时，没有关于a.c的任何内容。

Answer 1

这是一个有趣的问题，当我使用gcc a.h a.c main.c -o app -fprofile-arcs -ftest-coverage，只是改变a.h和a.c之间的序列，它的工作。