I recently updated Xcode from version 11.3 to 11.5 and one of my packages (that I use in one of my app, I developed both the app and the package) can't compile because of a permission error:
error: unable to open dependencies file (/Users/arguiot/Library/Developer/Xcode/DerivedData/Euclid_Calculator-esmjlsretjpuvpajvqzmllnvcpse/Build/Intermediates.noindex/Euler.build/Debug/Euler.build/Objects-normal/x86_64/Fibonacci-PACKAGE:https://github.com/arguiot/Euler::MAINGROUP::REF_0::REF_32.d) (in target 'Euler' from project 'Euler')
Command CompileSwiftSources emitted errors but did not return a nonzero exit code to indicate failure
It seems to be an Xcode problem (or xcodebuild toolchain) because the swift build command seems to work on the package. Unfortunately, there is no way of using the same command for my app, I have to use Xcode.
One obvious solution is to use Xcode 11.3 but WWDC and iOS 14 are coming and I don't want to be in a situation where I can't use the new features.
I already tried "common" stuff like cleaning the build folder, switching the build system to the legacy build system, ...
I also tried to give read & write access to everyone on the DerivedData folder (and subfolders).