introduced removal of c++ profiling files upon make clean, however the recursors README file still says:
$ PROFILEFLAGS=-fprofile-generate make
$ PROFILEFLAGS=-fprofile-use make clean all
now however make clean removes all the gcno and gcda files making this a little bit futile for people who stick to the documentation. ;-)
I'd recommend something like
-rm -f dep *.o *~ pdns_recursor rec_control optional/*.o
$ PROFILEFLAGS=-fprofile-use make proclean all
Fixed in cs 1462.