gcovr missing .gcda files after executing binary that is linked with a dynamically linked shard object libraries (.so)

Question

I am trying to use gcovr on my linux project and have no luck getting .gcda files for the dynamic library after executing binary.

I have a project called projectA which creates a library called libprojectA.so and the unit test project links libprojectA.so. The main goal here is that I want to see the code coverage of projectA functions invoked from the unit test binary UnitTestExecutable.

I have such a directory structure: Project Structure

This is the steps I followed to call gcovr.

1. Build projectA with its Makefile

   • Makefile has "-fprofile-arcs -ftest-coverage -fPIC"
   • creates .o and .gcno inside .build directory
   • creates dynamic library libprojectA.so

2. Build unittest

   • Makefile links libprojectA.so
   • Makefile has "-fprofile-arcs -ftest-coverage -fPIC"
   • creates .o and .gcno
   • creates binary UnitTestExecutable

3. Execute UnitTestExecutable

   • creates .gcda files inside /unittest/*.gcda
   • it doesn't create *.gcda inside /porjectA/ folder <== this is the problem

4. Call gcovr gcovr -v -r /projectA/ --html --html-details -o test-html-details.html --object-directory=/projectA/.build/

   Here it complains that it can't find *.gcda inside /projectA/.build/

Could someone please help ?

Thanks,