Coverage reported as 100%

[dbrgn]

This is my Travis config file: https://github.com/dbrgn/tldr-rs/blob/23d77aa7d1bc1b2e42fc4bda00f17786a1b1c3a6/.travis.yml

Travis build: https://travis-ci.org/dbrgn/tldr-rs/builds/104879566

And the coveralls page: https://coveralls.io/builds/4853387

For some reason the coverage is reported as 100%, even though that's not true.

Any ideas?

[huonw]

This is highly likely to be https://internals.rust-lang.org/t/disabling-gc-sections-when-test-is-specified/2163: the compiler is completely removing the code from dead functions, and so the coverage harness doesn't even know they exist. If it isn't that, then it is more likely to be a bug in kcov or coveralls, than travis-cargo is invoking kcov incorrectly (seems somewhat unlikely: it doesn't pass (m)any options).

To eliminate travis-cargo for sure, you could try running kcov locally if you're on a linux machine, e.g. using these instructions: https://users.rust-lang.org/t/tutorial-how-to-collect-test-coverages-for-rust-project/650

[jonas-schievink]

-C link-dead-code just landed, so this can be fixed in travis-cargo (needs to be made optional, since older Rust versions don't know it)