For C (and CPP obviously):
Include a fast and tiny RAM-tracing feature for Real-Time (RT) debugging purposes.
>> ONLY FOR DEBUGGING <<
Very much faster than printf-debugging, which may result in unforseen results in an RT environement.
The Logging Framework supports stream-like usability, extensibility, portability, type-safety, allows enabling/disabling certain parts or fully at compile time and dependent on the configuration also at runtime and avoids macro-related pitfalls.