As I understand it, when you define a custom build rule with a script, Xcode will pass each matching input file to your script though variables like INPUT_FILE_PATH. So you normally don't need to explicitly list input files. However, there is an "input files" section in the build rule definition. How is that used? I'm hoping that it only used for dependencies and deciding whether a rule needs to be run. For example, suppose my rule is compiling a source file. Normally I just want to re-run the compile if the source file changes, but if the compiler itself changes, I probably also want to recompile. Can I list the compiler as an input file?

When I try to use custom Core Image filters in the contentFilters property of an NSView, they don't work in Big Sur (as of 11.0.1 beta). They do work in Catalina. Doesn't matter if they're written using Metal or Core Image Kernel Language. I've reported this as a bug, but I'm wondering if there is some trick or workaround.