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).

Version 1.8.4

Remove version requirement from find_package when searching external fmt. #1890. Thanks @prince-chrismc

Version 1.8.3

• New hourly file sink . Creates new file every hour. Can be limited to retain only the last N files. Thanks @BVonk (#1763).
• New daily sink filename custom formatting. Users now can pass custom strftime pattern to the log filename. For example: daily_logger_format_mt("loggername", "log-%Y%m%d:%H:%M.txt", hours, minutes);. Thanks @fawdlstty (#1847).
• Fix windows event sink log compilation with UNICODE preprocessor. Thanks @iko1 (#1760).
• Add SPDLOG_DISABLE_DEFAULT_LOGGER as a CMake option. Thanks @shimaowo (#1765, #1766).
• Improve color terminal detection. Thanks @dominicpoeschko (#1768).
• Prevent windows color sink to leak windows headers into user code Thanks @Ryan-rsm-McKenzie (#1771).
• Ensure SPDLOG_FMT_EXTERNAL is honored in the bench program. Thanks @Ryan-rsm-McKenzie (#1773).
• Skip CMake module mode when finding fmt. Thanks @Ryan-rsm-McKenzie (#1774).
• Better support for "/" separators on Windows, and improve wchar filename test coverage. Thanks @sylveon (#1787).
• Open files with "ab" mode even if truncating to better support logrotate(8). Thanks @graydon (#1795).
• Fix compiling error and typo in hourly file sink. Thanks @sillykelvin (#1805).
• Add constexpr to SPDLOG_LEVEL_NAMES declaration. Thanks @gv-me (#1798).
• Initializer list style consistency. Thanks @ChristianPanov (#1807).
• Fix call to non-constexpr function (#1811).
• Better numeric_limits<>::max/min fix when SPDLOG_WCHAR_TO_UTF8_SUPPORT is defined. Thanks @nukeulater (#1819).
• Fix to prevent MSVC warning flags to propagate to CUDA. Thanks @prateek9623 (#1825, #1829).
• Fix windows stdout_sink raising exception when used GUI Windows Apps that lack a console. Thanks @dgehri for reporting (#1828).
• Simplified wincolor sink code and intensify the red and yellow colors.
• Set default value to registry::err_handler_ to resolve Klocwork warning. . Thanks @jneruda (#1835).
• Formatter bench: Fix compilation by avoiding function name decay mechanics. Thanks @MathiasMagnus (#1846).
• Add build2 package support in readme. Thanks @Klaim (#1851).
• Make sure __cplusplus is defined under msvc CMakeLists.txt
• Fixed VS2019 W4 cast warning (#1876).
• Fix warning whe the compilation flag -Wswitch-default is present. Thanks @imsherlock (#1882).

Version 1.8.2

• Bump fmt to version 7.1.3
• Download automatically googlebenchmark for bench tests (#1709) Thanks @kitattyor.
• Add CPack debian package settings (#1712) and fix typo in comment (#1711). Thanks @ChristofKaufmann.
• Perfect forwarding fmt arguments (#1726). Thanks @dkavolis.
• Fix dup_filter_sink to log current log call's level, instead of the filtered log call's level (#1710). Thanks @Tridacnid for reporting.
• Ability to get size of messages queue of async thread pool (#1735) Thanks @o2gy84.
• Add missing include (#1742). Thanks @jwittbrodt.
• Updated bin_to_hex example in the readme (#1744). Thanks @ArnaudBienner.
• Fix async periodic flush test (#1749). Thanks @bluescarni.

Version 1.8.1

• Fixed load_env_levels() and load_argv_levels() #1680 (thanks @Tridacnid ).
• Fixed stdout sink that produced extra carriage returns on Windows #1675 (thanks @chris-t-w ).
• Fixed msvc_sink including windows.h #1667 (thanks @Ryan-rsm-McKenzie).
• Fixed stopwatch's clock to use chrono::steady_clock #1676 (thanks @SuperWig).
• Added support for Rcpp (R cpp compiler) #1685 (thanks @eddelbuettel).

Version 1.8.0

• Upgraded bundled fmt to version 7.0.3.
• New stopwatch utility for quick & easy logging of elapsed time:

#include "spdlog/stopwatch.h"
void stopwatch_example()
{
    spdlog::stopwatch sw;    
    // do some work..
    spdlog::debug("Elapsed: {} seconds", sw);    // =>  "Elapsed 0.005116733 seconds"
    spdlog::debug("Elapsed: {:.3} seconds", sw);  // =>  "Elapsed 0.005 seconds"
}

• Raised CMake requirement to 3.10 and cleanup CMakeLists.txt (#1624). Thanks @tambry.
• Added get_level() and should_log() functions to the spdlog:: namespace (#1628). Thanks @eyalroz.
• Fixed tcp_client for macOS (#1640). Thanks @dkruempe.
• Fixed cfg::load_env_levels() function declaration (#1651). Thanks @bareya.
• Updated Fedora install info in the readme (#1653). Thanks @gk6k6k.
• Fixed #1617 (aligned function pattern flag is broken). Thanks @VelocityRa for reporting.
• Fixed #1581 (compiling under msys in win10).

Version 1.7.0

• Support for using external fmt version 7.x (bundled version is 6.2.1). Thanks @candrews .(22bee81).
• Fixed to_hex segmentation fault (#1611, 19f2804). Thanks @vitaut, @xvitaly, @kekePower and @lgbaldoni.
• Support for FMT_STRING compile time checking. Thanks @Tridacnid (30ee690).
• Fixed shared library building failure on Windows with non MSVC. Thanks @podsvirov (fe97a03).
• Fixed mingw testcase. Thanks @podsvirov (075dcee).
• Clean CMakeLists.txt. Thanks @Pospelove (cf55e5d).

Version 1.6.1

• Fixed deadlock in daily_file_sink that happened while cleaning older files. Thanks @IIFE for reporting(#1570) and for fixing(#1571).

• Fixed ringbuffer_sink::last_raw() and ringbuffer_sink::last_formatted() that didn't return latest elements. Thanks @vekkuli for reporting and fixing (#1563).

• Fixed missing symbol wstr_to_utf8buf(..) in windows dll build. Thanks @haquocviet for reporting (#1569).

• Bumped bundled fmt to version 6.2.1.