By ticking ‘Development Build’ & ‘Script Debugging’ in the Build Settings, I create these mdb-files (Mono DeBugger-files). However, I am wondering how to backtrace the Unity C# crash-line from this, since my crash-reports now will only give the crash in Xcode, which does not help me at all.
The crashes in Xcode aren’t as informative as Unity but you can generally get a general location. If it actually crashes, it will take you to the line which usually is in assembly. In assembly the methods are called by jumping to a label that will be x lines above the crash. Just find out that name and you can determine where the crash is happening. The why is left for you though it’s generally a null reference (from my experiences at least).