Version 1.14.1

• Fixed compatibility issue between c++17 and c++11 (#3081).
• Fixed creating folders under windows when full path with drive letter is given (#3079).
• Added mdc sample. Note: mdc is not supported in async loggers.

Version 1.14.0

• Updated bundled fmt to version 10.2.1.
• Mapped Diagnostic Context (MDC) support by @massimiliano96 in #2907.
  MDC is a simple map of key->string values stored in thread local storage whose content will be printed by the loggers.
  Usage example:

#include "spdlog/mdc.h"
..
spdlog::mdc::put("mdc_key_1", "mdc_value_1");
spdlog::info("Hello, {}", "World!");  // => [2024-04-26 02:08:05.040] [info] [mdc_key_1:mdc_value_1] Hello, World!

• Add milliseconds support to stopwatch by @brodao2 in #3034
• Add std::string_view overloads for logger accessor by @BenLeadbetter in #3023
• Make async_logger::flush() synchronous - wait for the flush operation to complete before returning by @walkerlala in #3049
• Use _stat() on Windows to be more UTF8 friendly by @liubing in #2978
• Add details about how compile time macros work by @egaban in #2981
• Fix typos found by codespell by @DimitriPapadopoulos in #3011
• Expose the flusher thread object to user in order to allow setting of thread name and thread affinity when needed by @cohdan in #3009
• Fix the problem of compilation failure under MINGW by @NU-LL in #3022
• Add missing include in circular_q.h by @magnus-nomono in #3026
• Fix #3038 by @Tomas-Zhu in #3044
• Don't remove previous defaullt logger from registry in set_default_logger. Fix #3016
• Remove the legacy AnalyzeTemporaryDtors option from .clang-tidy. by @shaharv in #3048
• Updated INSTALL.md has to better reflect compiler info by KaganCanSit in #3052
• Fixed README.md example by @darallium in #3066

Full Changelog: v1.13.0...v1.14.0

Special thanks to @tt4g for helping with community questions and issues.

Version 1.13.0

Release Notes

Enhancements

• Qt Sink: Allow for darker colors for light backgrounds (#2817). Thanks to @krawq.
• Set CMAKE_BUILD_TYPE only for single-config generators (#2839). Thanks to @moritz-h.
• Provide spdlog_header_only in build directory export (#2846). Thanks to @robertmaynard.
• Add SPDLOG_TO_VERSION to compare spdlog version (#2853). Thanks to @kegechen.
• Support async_overflow_policy::discard_new (#2876). Thanks to @walkerlala.
• Make syslog_sink.h's syslog_prio_from_level protected (#2918). Thanks to @shannonbooth.
• Fix OS availability check of pthread_threadid_np for iOS (#2897). Thanks to @lowdesertpunk.
• Add .git-blame-ignore-revs to ignore clang-format related commits (#2899). Thanks to @lowdesertpunk.
• Match SPDLOG_CONSTEXPR_FUNC to FMT_CONSTEXPR (#2901). Thanks to @kkraus14.

Bug Fixes

• Check fd_ is not nullptr in file_helper to prevent possible crash if disk is full (#2972).
• Fix encoding issue in qt_sinks (#2862). Thanks to @neothenil and @tt4g .
• Fix wrong thread_id (TID) in systemd_sink.h (#2919). Thanks to @M010.
• Update example.cpp to fix the vector issue in bin_example (#2963). Thanks to @zhuzhzh.
• Fix MSVC compile flag for no exceptions (#2974). Thanks to @Programicus.
• Fix bug in circular_q::size() (#2820).
• Fix link to fmt license file (#2967).

Maintenance

• Added and updated various tests for circular_q.
• Removed obsolete part from CMake configuration files (#2871). Thanks to @albert-github.
• Removed policy_max from cmake_minimum_required(..).
• Updated clang-format to google style and updated various formatting scripts.
• Bumped catch2

Special thanks to @tt4g for helping with community questions and issues.

Version 1.12.0

• Support for external fmtlib versions 10.x (#2694). Thanks @H1X4Dev and @mguludag.
• Better support for std::format (#2359, #2544, #2680, #2688). Thanks @eli-b , @sylveon and @bachittle.
• Added new qt color sink. Logs to QTextEdit widget with some nice colors.
• Update #include to a deprecated fmt header (#2545) .Thanks @kromain.
• Fixes and impovements to dup_filter_sink (#2549, #2563). Thanks @zydxhs and @zhuyadong.
• Fix unnecessary empty backtrace begin/end logs (#2568). Thanks @koldi.
• Fixed variable name in msvc_sink (#2573). Thanks @naddu77.
• Add system includes (SPDLOG_SYSTEM_INCLUDES) cmake option (#2575). Thanks @dpayne.
• Improve dequeue of the async queue (@2587, #2588 ). Thanks @alokpr.
• Fix tcp_client sink for FreeBSD (#2590). Thanks @segoon.
• Support linux/musl libc (#2589). Thanks @kraj.
• Support newlib C library configurations without tm_gmtoff field (#2600). Thanks @igrr.
• Fix type of event id in win_eventlog_sink (#2598). Thanks @Tagl.
• Fix -Wshadow warnings in spdlog::sinks::dist_sink (#2599). Thanks @robinlinden.
• Spelling corrections (#2606, #2732). Thanks @albert-github and @zencatalyst.
• Add sync() function to file_helper (#2343). Thanks @espkk.
• Add a trivial callback_sink (#2610). Thanks @maghorbani.
• Fix unexpected delimiter at start of line in to_hex formatter (#2627). Thanks @starsunyzl.
• Fix MinGW build issue on example (#2642). Thanks @zEuS0390.
• Add optional TID definition to the systemd sink (#2619). Thanks @chardin-cpi.
• Added apply_logger_env_levels() (#2648, #2649). Thanks @afshinpir.
• Support utf8 in msvc_sink (#2651). Thanks @Demonese.
• Better handling of utf to wchar (66407f5).
• Use catch v3 for tests (#2656, #2659). Thanks @xvitaly and @seker.
• New kafka sink (#2655). Thanks @vbirds and @SpriteOvO.
• Fix os namespace in systemd_sink.h (#2668). Thanks @MyNameIsLame.
• Enable systemd_sink tests in linux pipeline (#2669). Thanks @MyNameIsLame.
• Fix stdout_sink_base::log's fflush() behaviour inconsistency (#2646). Thanks @25077667.
• Fix for missing pthread_threadid_np in macOS < 10.6 and PowerPC (#2715). Thanks @barracuda156.
• Fix ringbuffer_sink moving warning (#2722). Thanks @jamesruan.
• Update INSTALL doc (#2775). Thanks @7starsea.
• Fix warning in qt_sinks.h (#2781). Thanks @dayfixer.
• Remove IPv4 limitation from tcp_client (#2790). Thanks @Simon-Janos.
• Fix android sink when message is not loggable (#2801). Thanks @lucasrangit.

Special thanks to @tt4g for helping with community questions and issues.

Version 1.11.0

• Update to fmt lib version 9.1.0 #2346, #2485, #2512, #2517 . Thanks @sylveon, @YunchengLiu, @tt4g, @tycho and @vitaut
• Fix template instantiation warning #2336 . Thanks @aengusjiang
• Event handlers improvements #2342, #2375 . Thanks @espkk and @kslattery
• Allow modifying the used Android buffer ID #2358. Thanks @tiolan
• Fix clone in async test #2364. Thanks @stkw0
• Custom formatting optimization #2365. Thanks @conr2d
• Fix C++14 builds for gcc 4.x (#2333) #2372 . Thanks @kslattery
• Add minor version to CMake's SOVERSION #2376
• Allow compilation with FMT_ENFORCE_COMPILE_STRING #2381. Thanks @john4744
• Fix pkg-config generation #2383. Thanks @alexshpilkin
• Remove unused code from null_mutex #2385. Thanks @panzhongxian
• Fix redundant std::move #2396. Thanks @polesapart
• Remove the empty file if in first period in hourly logger #2386. Thanks @panzhongxian
• Add reset_overrun_counter() function to the async logging #2399 Thanks @bergen4
• Set C++20 in CMake when SPDLOG_USE_STD_FORMAT option is turned on #2402. Thanks @cookcocck
• Fix mingw test #2415. Thanks @neheb
• Support for any std::chrono::duration type in flush_every(..) #2439. Thanks @LucasChollet
• Fix implicit casting of level_enum #2443. Thanks @ibmibmibm
• Comment fix #2445. Thanks @Hish15
• Fix gcc 4.x build #2449. Thanks @Simon-Janos
• Add openSUSE installation instructions #2468. Thanks @LorenDB
• Fixed missing include file in stopwatch.h #2434. Thanks @fabianbuettner
• Support for omitting source info by defining SPDLOG_NO_SOURCE_LOC #2476. Thanks @nigels-com
• Added SPDLOG_BUILD_PIC build option to CMake #2475. Thanks @nigels-com
• Fix include windows.h #2495. Thanks @panicgh
• Workaround gcc 12 warnings #2498, #2499 . Thanks @offa
• Migrate to Github Actions CI #2500. Thanks @offa
• Replace iterator difference with std::distance #2509 Thanks @kin4stat
• Export targets file to build directory at configure time #2514, #2515. Thanks @puneetmatharu
• MongoDB sink improvements #2519. Thanks @sandorzm
• Fix shadow warning in dist_sink #2431. Thanks @MohammadKanan for reporting.
• Fixed msvc warning C4800 in win_eventlog_sink
• Check IsDebuggerPresent() in msvc_sink before doing actual work #2408. To use old behavior pass false to the msvc_sink constructor. Thanks @DominikGrabiec and @sylveon

Special thanks to @tt4g for helping with community questions and issues.

Version 1.10.0

• Bump fmt to version 8.1.1.
• Added file event handlers #2165, #2169 Thanks @seker.
  You can get callbacks from spdlog before/after log file has been opened or closed.
  This is useful for cleanup procedures or for adding something to the start/end of the log files. Example:

  void file_events_example()
  {
    // pass the spdlog::file_event_handlers to file sinks for open/close log file notifications
    spdlog::file_event_handlers handlers;
    handlers.before_open = [](spdlog::filename_t filename) { spdlog::info("Before opening {}", filename); };
    handlers.after_open = [](spdlog::filename_t filename, std::FILE *fstream) { fputs("After opening\n", fstream); };
    handlers.before_close = [](spdlog::filename_t filename, std::FILE *fstream) { fputs("Before closing\n", fstream); };
    handlers.after_close = [](spdlog::filename_t filename) { spdlog::info("After closing {}", filename); };
    auto my_logger = spdlog::basic_logger_st("some_logger", "logs/events-sample.txt", true, handlers);        
  }

• Fixed rotating file sink: when disk is full log rotation resulted zero size log files. #2261. (thanks @kishorekrd for reporting).
• Added new udp_sink #2090. Thanks @CJLove
• (Experimental) Option to depend on std::format instead of fmtlib (set SPDLOG_USE_STD_FORMAT and use C++20). #2170 Thanks @sylveon .
• Improved file name for hourly file sink #2047. Thanks @seker .
• Added code location information for error handler #2048. Thanks @D-r-P-3-p-p-3-r .
• Fixed qt_sinks ctor #2056. Thanks @mguludag .
• List Debian instructions in the README #2057. Thanks @mr-c ,
• Updated to latest Travis CI Build Status #2094. Thanks @jspraul .
• Fixed unhandled errors in udp sink. #2096. Thanks @mmarkeloff .
• CMake improvement regarding cmake_minimum_required and policy. #2098. Thanks @reddwarf69 .
• Fixed mongo_sink compile in older gcc versions #2102 . Thanks @yzz-ihep .
• Remove mutable keyword from mutex_ member in of sinks. #2140 . Thanks @sunlong169 .
• Fix typos #2171. Thanks @rex4539 .
• Fixed udp sink build on FreeBSD #2172. Thanks @keith-dev .
• Avoid c-style casting in stdout sinks. #2179. Thanks @ibmibmibm .
• Fixed tweakme.h compile error under msvcs when SPDLOG_FUNCTION is defined #2182. Thanks @Light3039 .
• Fixed compiling errors on AIX #2181. Thanks @lisr .
• Fixed runtime when build with -fsanitize=cfi #1972. Thanks @bansan85 .
• Remove extraneous semicolon #2190. Thanks @sylveon.
• Added example how to replace default logger. #2194. Thanks @rioki .
• Fixed usage of ranges and to_hex in the same compile unit #2195. Thanks @patrickroocks .
• Reduce warnings with pedantic compiler -Wuseless-cast #2216. Thanks @vnepogodin .
• Support using std::span in to_hex #2228. Thanks @timblechmann .
• Reset current size if rotated files on open #2234. Thanks @SpriteOvO .
• Allow forward-declaration of level_enum #2245. Thanks @daverigby .
• Call localtime() only if pattern_formatter really needs it #2246. Thanks @doug1234 .
• Removed unneeded spaces from code. #2249. Thanks @PixelParas .
• Added a few missing files/directories to the gitignore #2255. Thanks @LeonBrands .
• Fixed issue #2201 (Pattern width is not applied for missing source information). #2269. Thanks @kyuheon-kr .
• Limit max number of rotating files to 200000. (Fixed #1905). Thanks @surfycui (#2273)
• pattern_formatter: fix reorder-ctor warning #2278. Thanks @adriweb .
• Fixed spdlogConfig.cmake when built with SPDLOG_FMT_EXTERNAL_HO #2300. Thanks @adamcalhoon .
• Fixed fopen_s(..) error handling when PREVENT_CHILD_FD is defined #2305. Thanks @nUl1.
• Fixed compiler error when building on Windows with #define UNICODE #2317. Thanks @risa2000 .
• Added option to enable formatting of systemd sink #2324, #2320. Thanks @Delgan .
• Added optional "ident" argument to systemd sink constructor #2328. Thanks @Delgan .

Special thanks to @tt4g for his support in answering community questions and issues.

Version 1.9.2

• Fixed clang compiler errors when using spdlog in c++20. Thanks @dkavolis (#2037, #2034).
• Fixed the Qt sinks to accurately trim the newline chars. Thanks @MadMax411 (#2015).
• Improved and simplified Qt sinks implementation. Thanks @mguludag (#2016, #2018).
• Fixed macro SPDLOG_LEVEL_NAME_xxx to always translate to the spdlog namespace. Thanks @ashley-b for reporting (#2022).
• Fixed typo in readme. Thanks @p-ranav (#2024).
• Fixed the MongoDB sink compilation in c++11. Thanks @jabartek (#2025).
• Fixed double include of same file in thread_pool.h . Thanks @hbwang15 (#2026).
• Ensure that the CMake exported package is relocatable. Thanks @daverigby (#2029).
• Remove std::distance usage for possible performance gain. Thanks @neheb (#2030).
• Support of inclusion of bin_to_hex.h in any order with spdlog.h. Thanks @dmerkushov (#2035).
• Fixed install instructions for "header only" dir. Thanks @madeso (#2036).

Version 1.9.1

• Support for {fmt}'s compile time validation of format strings (#2008). Thanks @dkavolis !
  In C++20:

  spdlog::info("{:d}", "bad format_arg"); // should not compile

  In C++14/17 - format string can be validated at compile time using FMT_STRING:

  spdlog::info(FMT_STRING("{:d}"), "bad format_arg");  // should not compile

• Fixed compilation error in Clang 13 with C++20 (#2011, #2013) Thanks @sjanel !

Version 1.9.0

What's new

• Support for {fmt} lib version 8.x.
• New MongoDB sink #1981 . Thanks @mguludag.
• New QTextEdit and QPlainTextEdit sinks #1986. Thanks @mguludag.

Fixes and Improvements

• Fixed #1790 (build failed with v140_xp, v141_xp toolset flags ). Thanks @LonghronShen.
• Fixed #1916 (fix Xcode compiler warning). Thanks @haifengkao.
• Made mutex member variable mutable #1918. Thanks @matt77hias.
• Changed c-style casts to reinterpret casts in tcp_client #1924. Thanks @ lnovey .
• Fix #533 . Rethrnow non std exceptions.
• Avoid harmless warning about unreachable statement in MSVS build #1930. Thanks @vadz.
• Fixed warning about testing _WIN64 which might be undefined #1931. THanks @vadz.
• Small code improvement (std::find) #1933. Thanks @neheb .
• Added support for CMake policy CMP0077 #1946. Thanks @JB-55,
• Allow compilation with nvc++ (and possibly PGI) #1958. Thanks @mlund .
• Fixed C++20 build resulting in deprecated implicit copy assignment operator warning #1961. Thanks @JB-55.
• Fix signed/unsigned mismatch in VS #1970 . Thanks @bansan85.
• Use std::function for the global error handler #1971. Thanks @SpriteOvO .
• Fixed dup sink compile warnings in older compilers with back_inserter.
• Added a color-terminal type #1984 to the color terminals list - to show colors in in RISC-V64 machines. Thanks @hctym1995.

Version 1.8.5

Fix compiling with C++17: remove constexpr on level_string_views. Thanks @stevenlunt (#1889).