With gcov, is it possible to merge to .gcda files?

Question

I have the same source files (C and Obj-C) being compiled into two targets: the unit test executable and the actual product (which then gets integration tested). The two tar

Answer 1

I think the intended way to do this is not to combine the .gcda files directly but to create independent coverage data files using

lcov -o unittests.coverage -c -d unittests
lcov -o integrationtests.coverage -c -d integrationtests

Each coverage data then represents one "run". You can of course create separate graphs or html views. But you can also combine the data using --add-tracefile, -a for short

lcov -o total.coverage -a unittests.coverage -a integrationtests.coverage

From the total.coverage you can generate the total report, using genhtml for example.