New features

• Added ringbuffer sink. Thanks @eudoxos (#1307).
• Auto create the required logging directories if they do not exist (9b7812a0f22f4743ee1618c7d879c8f30004253d).
• Update bundled fmt to version 6.1.2.
• Added the optional ! modifier to truncate the result if the field size exceeds the specified width (see wiki for details).

Fixes and improvements

• Fix build failure on clang 7 with libc++. Thanks @jktjkt (a03f9eb1561e738b9111e731d5f183c5b6093d71).
• Fix some spelling errors. Thanks @flopp .
• Fix - compilation when using external fmt library. Thanks @dvhwgumby for reporting (#1273).
• Fix location of CMake config info. Thanks @dvhwgumby for reporting (#1274)
• Fix missing include (9a68bd8cc8d721cc1c3a988c62229679df7b88be).
• CMake code duplication improvement. Thanks @bencsikandrei (#1283)
• CMake improvments in tests . Thanks @Andrei-Florin BENCSIK (2cc620ef33f7299e0c0ff05c629df7ccf0d35ce8)
• Remove unused variable. Thanks @masmullin2000 (#1285)
• Fix tests to Use _FILE_OFFSET_BITS=64 when building on Linux 32-bit systems. Thanks @yipdw (#1288).
• Improve systemd journald support. Thanks @jktjkt (#1292).
• Improve log macros. Thanks @pck (#1294).
• Removed lazy argument evaluation from macros (#163).
• Some micro optimizations (79468cf, 3ee4f28, bf40855).
• Correctly guard SetHandleInformation API call to better support compiling for UWP. Thanks @sylveon (#1296).
• Exclude from compilation prevent_child_fd() if SPDLOG_PREVENT_CHILD_FD not defined (57085c8)
• CMake - Added tweakme options to CMakeLists.txt (18edb8b).
• Removed SPDLOG_NO_DATETIME option.
• Fix meson tests build . Thanks vedranmiletic fore reporting (#1295, c081919, 4a4f13b, 436ce16).
• Use #include" <spdlog/.*> instead of spdlog/.* across the codebase. Thanks @RedDwarf69 (#1304).
• Fix struct tm doesn't have tm_gmtoff in ISO C. Thanks @lancesun (ff3e6c7248a0bfb1d44e72fd0f822320178263bc, #1306)
• Always cache gmt offset (de2c07a).
• Optimize backtracer operator= (255f7f2).
• Fix some clang-tidy warnings (93008b2, bff8572, 3999613).
• Fix compiler error in os-inl.h min/max on Windows (#1302).
• Remove redundant semicolon. Thanks @inhzus (#1311).
• Fix compiler warnings. Thanks @0x8000-0000 (#1331).
• Fix missing include header in `spdlog/sinks/daily_file_sink.h. Thanks @afoolsbag for reporting (#1332).
• Fix elapsed time larger than 6 digits ignores alignment width. Thanks @ivan236634452 for reporting (#1327).
• Set version for shared library in meson build. Thanks @lgbaldoni (#1337).
• Improved dist_sink ctor. Thanks @mmakhalaf for reporting (#1298).
• Fix #1325. Added SPDLOG_FMT_EXTERNAL_HO option. Thanks @steffenb7333 for reporting.
• Fix #1340 (missing include). Thanks @jeanga for reporting.
• Fix compile on Win10 with Cygwin. Thanks @frfrankkopp and @tt4g (#1347).
• Fixed #1348. Thanks @ficzerepeti for reporting.
• CMakeLists.txt allow overriding the cpp standard to higher than 11
• Fix a small problem in the basic example. Thanks @mike239x (#1367).
• Fix invalid meson option. Thanks @segfault-magnet (#1370).
• meson: add fallback to fmt dependency #1378. Thanks @idanko
• Update docs: spdlog now available in conan center, bincrafters repo is deprecated #1387. Thanks @gocarlos .