Tiny change to Kcov for better covering zig

(originally posted here: https://zig.news/liyu1981/tiny-change-to-kcov-for-better-covering-zig-hjm)

Recently just engaged with Zig, and I really like it. Strongly believe in that "Favor reading code over writing code." So I start to do something with it, and then I start to wonder how to use coverage tools.

Then I have read this wonderful article here
https://zig.news/squeek502/code-coverage-for-zig-1dk1, and learned kcov as such as amazing tool: fast and easy to use, and it works without any headache.

There is only one thing letting me down, which is that I do not find any instructions in kcov on how to ignore some lines in source code for not covering.

And as Zig has unreachable and @panic which should never be covered, so I spend some time wondering in the cpp code base of kcov.

Turns out, it is easier than I image, so I forked kcov and create my own version.

It can recognise zig’s unreachable and @panic, auto ignore it.
I also added the ability to add /* no-cover */ in c/cpp source code so that can make kcov ignore some lines too.

The result is quite satisfying to myself, like

this one auto ignoring unreachable

kcov auto ignoring zig unreachable