Just announced:

spdlog: Super fast C++ logging library [GitHub]

The description is really "in a nut":

Very fast, header only, C++ logging library.

Install: Just copy the files to your build tree and use a C++11 compiler

Features:

• Very fast -- performance is the primary goal (see becnhmarks below)
• Headers only
• No dependencies
• Cross platform - Linux / Windows on 32/64 bits
• Mult/Single threaded loggers
• Rotating log files
• Daily log files
• Console logging
• Optional async logging
• Logging levels
• Custom formatting with user defined patterns