since a recent beta build (currently Xcode 11A1027 and macOS 19A578c) Xcode is not able to start Metal debuger sessions. Error says it cannot find the metal library source files:
Error DYPShaderDebuggerErrorDomain:1: Unable to find library source
Is this just me? I've tried with a trivial project which has only one .metal file, and also seeing it with Apple demo code (hello triangle). I've tried to add the suggested '-gline-tables-only' and '-MO' metal compiler flags to no effect.
looks like it's been fixed in Xcode 11.2 11B41