added fix for issue 2735

OBS-URL: https://build.opensuse.org/package/show/devel:libraries:c_c++/spdlog?expand=0&rev=79

spdlog.spec

@@ -29,6 +29,8 @@ Source0:        https://github.com/gabime/%{name}/archive/v%{version}.tar.gz#/%{
 Patch0:         0ca574ae168820da0268b3ec7607ca7b33024d05.patch
 # PATCH-FIX-UPSTREAM v1.11.0_removed_brackets_for_fmt_10.diff
 Patch1:         v1.11.0_removed_brackets_for_fmt_10.diff
+# PATCH-FIX-UPSTREAM tt4g-fix-2735.diff
+Patch2:         tt4g-fix-2735.diff
 Source99:       baselibs.conf
 BuildRequires:  cmake >= 3.10
 %if 0%{?suse_version} > 1500

tt4g-fix-2735.diff

@@ -0,0 +1,50 @@
+diff --git a/include/spdlog/sinks/daily_file_sink.h b/include/spdlog/sinks/daily_file_sink.h
+index f6f1bb1d..31516ee2 100644
+--- a/include/spdlog/sinks/daily_file_sink.h
++++ b/include/spdlog/sinks/daily_file_sink.h
+@@ -18,6 +18,7 @@
+ #include <ctime>
+ #include <mutex>
+ #include <string>
++#include <vector>
+ 
+ namespace spdlog {
+ namespace sinks {
+@@ -48,7 +49,6 @@ struct daily_filename_format_calculator
+ {
+     static filename_t calc_filename(const filename_t &filename, const tm &now_tm)
+     {
+-#ifdef SPDLOG_USE_STD_FORMAT
+         // adapted from fmtlib: https://github.com/fmtlib/fmt/blob/8.0.1/include/fmt/chrono.h#L522-L546
+ 
+         filename_t tm_format;
+@@ -59,7 +59,7 @@ struct daily_filename_format_calculator
+         tm_format.push_back(' ');
+ 
+         const size_t MIN_SIZE = 10;
+-        filename_t buf;
++        std::vector<char> buf;
+         buf.resize(MIN_SIZE);
+         for (;;)
+         {
+@@ -73,19 +73,7 @@ struct daily_filename_format_calculator
+             buf.resize(buf.size() * 2);
+         }
+ 
+-        return buf;
+-#else
+-        // generate fmt datetime format string, e.g. {:%Y-%m-%d}.
+-        filename_t fmt_filename = fmt::format(SPDLOG_FMT_STRING(SPDLOG_FILENAME_T("{{:{}}}")), filename);
+-
+-        // MSVC doesn't allow fmt::runtime(..) with wchar, with fmtlib versions < 9.1.x
+-#    if defined(_MSC_VER) && defined(SPDLOG_WCHAR_FILENAMES) && FMT_VERSION < 90101
+-        return fmt::format(fmt_filename, now_tm);
+-#    else
+-        return fmt::format(SPDLOG_FMT_RUNTIME(fmt_filename), now_tm);
+-#    endif
+-
+-#endif
++        return std::string(buf.cbegin(), buf.cend());
+     }
+ 
+ private: