> That is expected (alas).Why? Where is this documented?I don't see how it's acceptable that stuff just "doesn't work", without further explanation.> Note that os_log is one area where the SDK and toolchain must be well aligned because it uses compiler smarts to optimise the way that the format string gets included in the log.Again, where is this documented?Some of us are using older SDKs because it's the recommended practice when supporting older macOS versions (see e.g. https://stackoverflow.com/a/15092753/3688293). I don't understand how a simple logging function can have bugs because of this.