Preprocessor directive stays defined even after deleting a package

I have a project with a bunch of different packages. Some of them have conditional references to others, hidden behind #if directives for a symbol that is #define'd in the other package.

I deleted one of these package, but C# is still acting as if its symbol is defined. I've searched the project, and this symbol only exists throughout the project in #if directives checking for it. Yet, there #if directives are coming back as true, and C# is trying to compile the code inside (and failing because those classes no longer exist).

Is there something I need to do to make it forget the symbols that have been deleted? Some way to clean out the #define symbols entirely and start from scratch?

My next step is to Reimport All, but I have no idea if that'll fix it and it'll take hours (plus there's definitely a risk that that might break something else).

 

Sounds like a recompile didn't happen. Try reimport any single script, preferably one in Plugins

 

Found the answer: Apparently, Project Settings -> Player -> Other Settings -> Compilation includes just like, a list of preprocessor directives. For some reason. The culprit was in that list.

I hope this thread's existence helps some future googler find that absolutely bizarre panel in settings and fix their compilation.

 

For future readers. The reason is that that place is the correct place where define symbols exists for your project. Packages/assets can use code to add their own to that list. I don't believe that there's any system that will remove them once you uninstall a package/asset since you can manually write anything in that list so the system wouldn't know which one was added by a package/asset or which one was manually added.

 

A future Googler has just been helped. Hello from the future and thank you.