https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89961
--- Comment #18 from xaizek <xaizek at posteo dot net> --- > The following 2 files should be created (right now b.gcov.json.gz and > a.gcov.json.gz are created) > > b.gcov.json.gz > src/a.gcov.json.gz > > and so -p and -x does not play any role here. Now you'll need to search for output recursively, but this will fix the issue, although I'm not sure what will happen if you run `gcov` outside of build tree (I remember the docs, but isn't intermediate format is more usable because it doesn't need sources and so the restriction on where to run `gcov` doesn't apply?). I still don't understand why not just make `-p` and `-x` work? The options are there anyway. By the way, I worked around the issue in May by not invoking `gcov` with two files that are named identically. It works even with GCC 8 for me (although not in one call), but people will continue to use `-p` and `-x` and get surprising results.
