log4j log4j based loggers Log4cplus
Example
https://sourceforge.net/projects/log4cplus/
- updates/bug fixes - last release was Jan. 2016
- user can select select different LogLevels – TRACE, DEBUG, INFO, WARN, ERROR, and FATAL hierarchical Loggers
- supports multi–threaded applications but is not safe to be used from asynchronous signals’ handlers
- user selected output format: SimpleLayout, PatternLayout, TTCCLayout
- supports multiple loggers
- not well documented
- is licensed under the Apache License V2.0
