Tip
If import glog to build.
The general configuration of the log is in the head file logger.h .
Uncomment FLAGS_v = 2 ; and recompile to enable the detail levels, the log is printed by VLOG(n)
For information on how to use the log library, such as how to configure, print, etc., please open its document and learn more:
$ ./scripts/open.sh third_party/glog/doc/glog.html