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The C++ logging macros (RCLCPP_INFO etc) are generated by the file logging.hpp.em and end up I the header rclcpp/logging.hpp (https://github.com/ros2/rclcpp/blob/3aca271ef5d25c1b8c12e67ecf85166856a88000/rclcpp/CMakeLists.txt#L124)

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