https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67937
--- Comment #1 from Joshua Cranmer <Pidgeot18 at gmail dot com> --- Created attachment 36485 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=36485&action=edit test-case.gcda (It's a 4.7 test case, but the file format can still be read with trunk gcov the last I checked. Since the originating issue comes from "compile Firefox", I haven't tried preparing .gcda/.gcno files from newer gcc).
