"in 'l'etter)\n"
" -> %%L: line number where the log event was raised (LOG4J compatible)\n"
" -> %%M: function name (LOG4J compatible -- called method name here of course).\n"
- " Defined only when using gcc because there is no __func__ elsewhere.\n"
"\n"
" -> %%b: full backtrace (Called %%throwable in LOG4J). Defined only under windows or when using the "
"GNU libc because\n"