spdlog Features

• Very fast (see benchmarks below).
• Headers only or compiled
• Feature rich formatting, using the excellent fmt library.
• Asynchronous mode (optional)
• Custom formatting.
• Multi/Single threaded loggers.
• Various log targets:
  • Rotating log files.
  • Daily log files.
  • Console logging (colors supported).
  • syslog.
  • Windows debugger (OutputDebugString(..))
  • Easily extendable with custom log targets (just implement a single function in the sink interface).
• Log filtering - log levels can be modified in runtime as well as in compile time.
• Support for loading log levels from argv or from environment var.
• Backtrace support - store debug messages in a ring buffer and display later on demand.