Very fast, header-only/compiled, C++ logging library.

Install

Header only version

Copy the include folder to your build tree and use a C++11 compiler.

Static lib version (recommended - much faster compile times)

$ git clone https://github.com/gabime/spdlog.git

$ cd spdlog && mkdir build && cd build

$ cmake .. && make -j

Platforms

• Linux, FreeBSD, OpenBSD, Solaris, AIX

• Windows (msvc 2013+, cygwin)

• macOS (clang 3.5+)

• Android

Package managers:

• Debian: sudo apt install libspdlog-dev

• Homebrew: brew install spdlog

• MacPorts: sudo port install spdlog

• FreeBSD: ?pkg install spdlog

• Fedora: dnf install spdlog

• Gentoo: emerge dev-libs/spdlog

• Arch Linux: pacman -S spdlog

• vcpkg: vcpkg install spdlog

• conan: spdlog/[>=1.4.1]

• conda: conda install -c conda-forge spdlog

• build2: depends: spdlog ^1.8.2

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 event log.

• Windows debugger (OutputDebugString(..)).

• Easily extendable with custom log targets.

• 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.

Usage samples

Basic usage

Create stdout/stderr logger object

Basic file logger

Rotating files

Daily files

Backtrace support

Periodic flush

Stopwatch

Log binary data in hex

Logger with multi sinks - each with different format and log level

Asynchronous logging

Asynchronous logger with multi sinks

User defined types

User defined flags in the log pattern

Custom error handler

syslog

Android example

Load log levels from env variable or from argv

So then you can:

Log file open/close event handlers

Replace the Default Logger

Benchmarks

Asynchronous mode

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