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GCovr generate a 0% coverage report, if cpp,gcno and gcda files are not present at same folder

I have two folder inside same folder as below :-
1.src (it contains my cpp file)
2.linux (where I am running g++ and executing o file)
now I am running commands as below

cd linux
g++ --coverage ../src/example1.cpp -o example1
./example1
cd ..
/opt/gcovr-3.2//scripts/gcovr -v -r .

I got output as, with 0% coverage

Scanning directory . for gcda/gcno files...
Found 2 files (and will process 1)
Running gcov: 'gcov /opt/gcovr-3.2/doc/examples/example1/linux/example1.gcda --branch-counts --branch-probabilities --preserve-paths --object-directory /opt/gcovr-3.2/doc/examples/example1/linux' in '/opt/gcovr-3.2/doc/examples/example1/linux'
Parsing coverage data for file /opt/gcovr-3.2/doc/examples/src/example1.cpp
Filtering coverage data for file /opt/gcovr-3.2/doc/examples/src/example1.cpp
Gathered coveraged data for 0 files

To debug further, I goto 'linux' folder as run below command 

gcov /opt/gcovr-3.2/doc/examples/example1/linux/example1.gcno --branch-counts --branch-probabilities --preserve-paths --object-directory /opt/gcovr-3.2/doc/examples/example1/linux

I got output as, with valid coverage

/opt/gcovr-3.2/doc/examples/example1/linux
File '../src/example1.cpp'
Lines executed:85.71% of 7
Branches executed:100.00% of 2
Taken at least once:50.00% of 2
Calls executed:100.00% of 1
../src/example1.cpp:creating '..#src#example1.cpp.gcov'

Now I want to know what wrong I am doing? my project is complex, so I don't want to do copy all cpp files from respective 'src' folder to respective 'linux' folder. I tried with --object-directory then also same result.

Solution

  • I have been working with gcovr and gcov since few months now.

    The only thing that's different from what I am doing is that you are not specifying the path properly in "-r" flag.

    You should specify the complete path always.

    It's fine even if it's not canonical but path should be complete.

    And always specify an extra slash "/" or "\" for linux and windows respectively after the root directory name. For example 

    -r "/path/to/root/directory/"

    It seems that this extra slash is important otherwise it gives problem. Don't know the exact problem, but I assumed it doesn't search recursively without the end slash.