Could not generate unknown file: Attempt to recreate a file for type about spoofax-pie

[Gohla]

metaborg/pie@6ee1c79 should fix it, the issue was that the generated sources were indeed passed as a source path. Fixed by generating the PIE Java sources into a different directory.

[Virtlink]

I found that Intellij was using Gradle 6.8 whereas ./gradlew is using Gradle 6.9.1. I sometimes compile from the command-line and sometimes from Intellij. It could be that this issue is caused because of this.

[Virtlink]

Okay, this still happens despite the fact that I'm now very sure that I use the same version.

[Gohla]

I have seen this occasionally happening, cleaning that project fixes it for me, but I don't know how to properly fix this. Does it happen every time? Maybe it could be fixed by adding a Gradle task that cleans the generated files before compilation.

[Virtlink]

It seems to occur when I mix building Spoofax 3 from the command line and from Intellij, even if the versions of Gradle match and the gradle tasks to be executed are the same. I've now resorted to just using Intellij, which seems to avoid the problem mostly, and executing clean -fxd in the pie directory can fix it if it occurs.