Omnisharp's checker is not detected by Flycheck

[ghost]

Greetings,

I have some trouble with getting Flycheck to work with OmniSharp. Curl is located in usr/bin/. This is also one of the paths associated the exec-path variable. Despite that, Flycheck wasn't working, so I tried to type the whole path myself. This didn't work either.

When I enter flycheck-describe-checker, Emacs tells me it supports omnisharp-mode only. flycheck-verify-setup tells me there are no checkers for the current .cs buffer. flycheck-verify-checker tells me that csharp-mode is not supported. I then figured, I'd try to add it by following this link. It resulted in an error with a no-good description and when I launched Emacs with argument --debug-init, I was greeted with an empty buffer.

I am fairly new to Emacs, so I have no idea if my attempts have been in the right direction, but I am at a loss now.

[ngscheurich]

@Wozar, I was able to get around a similar (possibly identical) issue by adding csharp-mode to csharp-omnisharp-checker’s list of major modes:

:modes (omnisharp-mode csharp-mode)

I later found folks with similar issues and solutions in #252 and #259, so this will hopefully be addressed soon.

[ghost]

@ngscheurich I have already tried that. Unfortunately it did not work for me. When I add csharp-mode to the :modes line, flycheck-describe-checker still tells me that it only supports omnisharp-mode.

You don't think this could have anything to do with incompatability of the newest version of Emacs (25.1.2)?

[ngscheurich]

@Wozar Hmm… Not sure, but potentially—I'm running 25.1.1.

GNU Emacs 25.1.1 (x86_64-apple-darwin16.0.0, Carbon Version 157 AppKit 1504)

[ghost]

@ngscheurich Fair enough. I appreciate the help anyways.

I also apologize for a late response. I have no idea where you can view notifications on GitHub.

EDIT: Misspelling of a word

[ghost]

Since the non-roslyn part has been abandoned, is this issue still relevant?

[razzmatazz]

I don't think so. Unless this is still an issue for you with the roslyn version?

[ghost]

So yesterday I started playing with it again. I tested in a single file and I also cloned the omnisharp-roslyn repo, not to build it, but because it included a .sln file, which I remember is required for at least code completion and syntax checking to work? I didn't actually test with flycheck, but initially I couldn't get company to work, so I'd assume flycheck probably wouldn't work either.

I would guess it didn't work because I didn't have .NET installed. Since I was a little all over the place when trying to fix it, I ended up installing .NET version 2.0 (which is a preview) and version 1.1 from the AUR. I didn't test after each install, so I can't say which resulted in a fix. It still doesn't work for a single file, but testing with the .sln in the omnisharp-roslyn repo, it works.

[razzmatazz]

@Wozar you don't need a sln file, a path to plain csproj is sufficient for omnisharp-roslyn to boot up

what platform are you on? if you are using mac or linux then:

• install mono
• invoke M-x omnisharp-install-server which should setup the server for you (there is no need to specify omnisharp-server-executable-path manually anymore) — see Automatic installation of server binaries #275

this should be enough to have a working installation — with flycheck and company working (unless I forgot something..)

also, there should be no need to install .net core (at least the server version that is installed via M-x omnisharp-install-server requires mono and not the .net core version of CLR. those can coexist though

[ghost]

Interesting. I do use Linux (Arch if that matters) and did install it the way you specified. If installing .NET core didn't help, then I haven no idea how it magically started to work.

[razzmatazz]

Ok, I have added a note to #275 and I am closing this if the original issue (flycheck) is working for you now.