Log4cpp is library of C++ classes for flexible logging to files, syslog, IDSA and other destinations. It is modeled after the Log4j Java library, staying as close to their API as is reasonable.

• Multiple log levels (DEBUG, INFO, WARN, ERROR, FATAL, ...)
• Thread-safe logging
• Customizable log format
• Console and file appenders, including:
  • Size-based rolling files
  • Daily rolling files
  • Syslog
  • IDSA
  • SMTP
  • Windows Event Log
• No external dependencies
• Cross-platform (Linux, macOS, Windows)
• Build support with Autotools, CMake

Choose the latest stable version or a recent release candidate.

Get the latest version of the source code:

git clone https://github.com/log4cpp/log4cpp.git

./autogen.sh  # optional
./configure
make
make check
make install

cmake -S . -B build_release -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=$HOME/.local -DLOG4CPP_BUILD_EXAMPLES=ON
cmake --build build_release
cd build_release/tests; ctest
cd ../..; cmake --install build_release

Additional build methods are listed on the project website (http://log4cpp.sf.net/).

CMake usage examples are provided for two scenarios:

• importing a CMake-installed log4cpp library: log4cpp_as_package
• using log4cpp as a CMake subproject : log4cpp_as_subproject

Building examples is enabled via the LOG4CPP_BUILD_EXAMPLES configuration option (-DLOG4CPP_BUILD_EXAMPLES=ON). Both shared and static library variants are demonstrated. The CMake usage examples can be built either:

• as part of the log4cpp build (when LOG4CPP_BUILD_EXAMPLES is enabled), or
• as standalone CMake applications that import or include log4cpp from their own directories. To build an example as a standalone application, change into the example directory and build it separately with CMake.

  cd examples/cmake_usages/log4cpp_as_subproject 
  cmake -S . -B build
  cmake --build build

  cd examples/cmake_usages/log4cpp_as_package    
  cmake -S . -B build -DCMAKE_PREFIX_PATH=$HOME/.local # possible after log4cpp was installed with CMake  
  cmake --build build