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Gergely Polonkai @gergely
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people, is there a comparison somewhere, biased or not, between FlyMake and FlyCheck?

@gergely I don't know if there's a table-like compassion of features (at most something like this: flycheck.org/en/latest/languag), but from experience I'd say the only reason to use FlyMake is because it's built-in, but even in Emacs 26, it's just not as good as FlyCheck.

but that's just my opinion.

#emacs

@gergely it depends on your use case and (at this point in time) emacs version. I'm pretty sure Flymake got a major overhaul in Emacs 26 and is supposed to be better now, but I'm not sure how true that is (I don't use it). Anyway:

Flymake:

Pros: built-in,
will work for most compiled mainstream languages
Cons: doesn't have support for many languages

Flycheck:
Pros: works with many languages
easier to support new ones
Cons: not built in, so requires install.

Hope that helped a little and YMMV