...CMake works by generating native makefiles or build projects that can be used in the compiler environment of your choice. You can either build glog with CMake as a standalone project or it can be incorporated into an existing CMake build for another project. glog defines a series of macros that simplify many common logging tasks. You can log messages by severity level, control logging behavior from the command line, log based on conditionals, abort the program when expected conditions are not met, etc.