Define a new compile func for go 1.16

[gravis]

go test -i is deprecated in go 1.16, and it makes the output parsing
fail, leading to to no coverage reported.

closes #613

[riannucci]

Thanks :)

[paupin2]

This apparently works, but it breaks older repos, that use different go versions.
An ideal solution would be to add/remove the flag depending on each repository's go version (from go.mod).

[gravis]

@paupin2 Good catch. @riannucci should we revert this change, and take another angle for this? Happy to contribute to another solution.

[paupin2]

TBH I'm not sure if that many people work with multiple repositories with different go versions simultaneously. This might be a good compromise/first iteration solution.

[riannucci]

So another thought I have; I think that this flag became deprecated around Go 1.10 when build caches were introduced... Should we just not use '-i' at all, on the assumption that folks are using Go >1.10?

[gravis]

Sounds like a good idea, but I think we need to understand what @paupin2 meant by

it breaks older repos, that use different go versions.

Are you referring to repos using go <= 1.10?

[paupin2]

Yes, I was @gravis. But I realized that doesn't make sense, the only thing that matters is the version of the go binary that's used to run tests, and that doesn't vary between repositories. So either conditional compilation (as it is now) or just assuming go > 1.10 should be perfectly fine.
Sorry for the noise…