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887f3660ed
Since we already have fairly complicated scriptts, I figured it wouldn't be too hard to use the gcov tools and directly parse their output. Boy was I wrong. The gcov intermediary format is a bit of a mess. In version 5.4, a text-based intermediary format is written to a single .gcov file per executable. This changed sometime before version 7.5, when it started writing separate .gcov files per .o files. And in version 9 this intermediary format has been entirely replaced with an incompatible json format! Ironically, this means the internal-only .gcda/.gcno binary format has actually been more stable than the intermediary format. Also there's no way to avoid temporary .gcov files generated in the project root, which risks messing with how test.py runs parallel tests. Fortunately this looks like it will be fixed in gcov version 9. --- Ended up switching to lcov, which was the right way to go. lcov handles all of the gcov parsing, provides an easily parsable output, and even provides a set of higher-level commands to manage coverage collection from different runs. Since this is all provided by lcov, was able to simplify coverage.py quite a bit. Now it just parses the .info files output by lcov.