gcov不会生成头文件的覆盖率信息 [英] gcov is not generating coverage information for header files

问题描述

我第一次使用 gcov ，而我有一个类似于这个螺纹。然而，我没有能够解决我的问题后，该线程中的意见。

我试图测量一个具体测试用例在 KMyMoney-4.6.4 ，即测试文件中的testConstructor mymoneyaccounttest.cpp。此测试用例使用以下方法，它位于头文件mymoneyaccount.h中并具有可执行代码： QString的&安培; institutionId（void）const {
return m_institution;
}

因此，我构建了程序和测试，然后执行：
gcov mymoneyaccount.cpp

在显示的覆盖率信息中，我获得：

...
文件'mymoneyaccount.cpp'
执行的行数：393 $的8.91％b $ b创建'mymoneyaccount.cpp.gcov'

文件'mymoneyaccount。 h'
执行的行数：4
的25.00％创建'mymoneyaccount.h.gcov'
...

覆盖信息在mymoneyaccount.cpp.gcov是好的。相反，mymoneyaccount.h.gcov显示：

  6：81：class KMM_MYMONEY_EXPORT MyMoneyAccount：public MyMoneyObject，public MyMoneyKeyValueContainer 
 ... 
  - ：192：const QString& InstitutionId（void）const {
  - ：193：return m_institution; 
  - ：194：} 
 ... 
  - ：272：int accountCount（void）const {
 #####：273：return m_accountList.count（）; 
  - ：274：}; 
  

也许我错了，但是这个结果意味着gcov不考虑return m_institution;作为可执行代码，同时考虑将返回m_accountList.count（）作为可执行代码。此外，它在类声明的行中显示6，所以这个文件有覆盖信息，但不是我期望的。

我不得不说问题与文件和目录的名称有关：

1-目标文件在CMakefiles / kmm_mymoney.dir中创建，以.cpp。结尾。 o，例如mymoneyaccount.cpp.o。因此，使用名称mymoneyaccount.cpp.gcno和mymoneyaccount.cpp.gcda（当然，在CMakefiles / kmm_mymoney.dir目录中）创建gcno和gcda文件。

2-当我执行时：
gcov -o CMakeFiles / kmm_mymoney.dir mymoneyaccount.cpp
gcov给出以下错误：

mymoneyaccount.gcno：无法打开便签文件

所以我必须重命名这些文件：
mv mymoneyaccount.cpp.gcno mymoneyaccount .gcno
mv mymoneyaccount.cpp.gcda mymoneyaccount.gcda

最后，我还有一个问题。当我在包含测试用例的文件中执行gcov时，我的意思是，gcov mymoneyaccounttest.cpp而不是gcov mymoneyaccount.cpp，我也获得了mymoneyaccount.h.gcov文件，但覆盖率信息更差：

  #####：81：class KMM_MYMONEY_EXPORT MyMoneyAccount：public MyMoneyObject，public MyMoneyKeyValueContainer 
  
 
 
对不起。谢谢。
解决方案
非常感谢Tony！该链接有解决方案。我只是将优化从-O2更改为-O0，现在结果是：
 
 
  1：192：const QString& InstitutionId（void）const {
 1：193：return m_institution; 
  - ：194：} 
  
我必须注意，要获得mymoneyaccount.cpp。 gcov我执行gcov mymoneyaccount.cpp，但要获得mymoneyaccount.h.gcov我必须执行gcov mymoneyaccounttest.cpp。你知道为什么吗？这两个文件都包含mymoneyaccount.h。
 
I'm using gcov for the first time and I'm having a problem which is similar to the one reported in this thread. However, I wasn't able to solve my problem following the comments in that thread.

I'm trying to measure the coverage of a concrete test case in KMyMoney-4.6.4, namely "testConstructor" in the test file "mymoneyaccounttest.cpp". This test case is using the following method, which is in the header file "mymoneyaccount.h" and has executable code:
 const QString& institutionId(void) const {
    return m_institution;
  }
So, I build the program and the tests, and then execute:
gcov mymoneyaccount.cpp

Among the coverage information displayed, I obtain:

...
File 'mymoneyaccount.cpp'
Lines executed:8.91% of 393
Creating 'mymoneyaccount.cpp.gcov'

File 'mymoneyaccount.h'
Lines executed:25.00% of 4
Creating 'mymoneyaccount.h.gcov'
...

The coverage information in "mymoneyaccount.cpp.gcov" is ok. In contrast, "mymoneyaccount.h.gcov" shows:
    6:   81:class KMM_MYMONEY_EXPORT MyMoneyAccount : public MyMoneyObject, public MyMoneyKeyValueContainer
    ...
    -:  192:  const QString& institutionId(void) const {
    -:  193:    return m_institution;
    -:  194:  }
    ...
    -:  272:  int accountCount(void) const {
#####:  273:    return m_accountList.count();
    -:  274:  };
Maybe I'm wrong, but this result means that gcov is not considering "return m_institution;" as executable code while does it considering "return m_accountList.count()" as executable code. Moreover, it shows "6" in the line of the class declaration, so this file has coverage information but not what I was expecting.

I have to say that maybe the problem has to do with the names of the files and the directories:

1- The object files are created in "CMakefiles/kmm_mymoney.dir" ending with ".cpp.o", for instance, mymoneyaccount.cpp.o. Thus, the "gcno" and "gcda" files are created with the name "mymoneyaccount.cpp.gcno" and "mymoneyaccount.cpp.gcda" (of course, in the directory "CMakefiles/kmm_mymoney.dir").

2- When I execute:
gcov -o CMakeFiles/kmm_mymoney.dir mymoneyaccount.cpp
gcov gives the following error:

mymoneyaccount.gcno:cannot open notes file

So I have to rename those files:
mv mymoneyaccount.cpp.gcno mymoneyaccount.gcno
mv mymoneyaccount.cpp.gcda mymoneyaccount.gcda

Finally, I have another question. When I execute gcov in the file containing the test cases, I mean, "gcov mymoneyaccounttest.cpp" instead of "gcov mymoneyaccount.cpp", I also obtain a "mymoneyaccount.h.gcov" file, but the coverage information is even worse:
#####:   81:class KMM_MYMONEY_EXPORT MyMoneyAccount : public MyMoneyObject, public MyMoneyKeyValueContainer
Anyway, the question is: should I execute "gcov" on the implementation file "mymoneyaccount.cpp" or in the test file "mymoneyaccounttest.cpp"?

Sorry for the length. Thanks.
解决方案
Thank you very much Tony!! That link had the solution. I just changed the optimization from -O2 to -O0 and now the result is: 
1: 192: const QString& institutionId(void) const { 
1: 193:     return m_institution; 
-: 194: } 
I have to note that to obtain "mymoneyaccount.cpp.gcov" I execute "gcov mymoneyaccount.cpp", but to obtain "mymoneyaccount.h.gcov" I have to execute "gcov mymoneyaccounttest.cpp". Do you know why? Both files include "mymoneyaccount.h".

                        
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