Small test program to determine os_logs behavior when used with Swift 4.2 @inlinable and @usableFromInline. It was suggested that inlining could overcome os_logs limitation on capturing the immediate calling function's static context (file, line, func). See TraceLog issue #44 for details.
Output of test run:
> log show --predicate 'subsystem == "os_log_inlinable"' --style json --source --last 1m
Filtering the log data using "subsystem == "os_log_inlinable""
Skipping info and debug messages, pass --info and/or --debug to include.
[{
"traceID" : 78134079258628,
"messageType" : "Default",
"eventType" : "logEvent",
"signpostID" : 0,
"source" : {
"symbol" : "$S16os_log_inlinable6LoggerV0B11SecondLevelyySSFZ",
"line" : 24,
"image" : "os_log_inlinablePackageTests",
"file" : "os_log_inlinable.swift"
},
"activityIdentifier" : 0,
"subsystem" : "os_log_inlinable",
"category" : "test",
"threadID" : 17657416,
"timestamp" : "2018-06-10 08:47:50.829488-0700",
"machTimestamp" : 1218436261547097,
"eventMessage" : "Hello, World!",
"processID" : 95957,
"senderProgramCounter" : 7221,
"parentActivityIdentifier" : 0,
"timezoneName" : ""
}]