v1.14.1, GCC 14.2.1, With Precompiled Header -- Noisy Compilation From Spdlog

[limitedAtonement]

I have a small example that reproduces the problem:

1. git clone --recurse-submodules git@github.com:limitedAtonement/spdlog-problem
   • Clones the example repository and spdlog submodule at v1.14.1
   • To check the spdlog version, cd spdlog-problem/src/spdlog && git log --oneline --graph --decorate --all or whatever
2. cd spdlog-problem
3. git checkout origin/illustration
4. make clean && make

I get output like

In file included from src/spdlog/include/spdlog/fmt/bundled/format.h:4530,                                                               
                 from src/spdlog/include/spdlog/fmt/bundled/core.h:2967,                                                                 
                 from src/spdlog/include/spdlog/fmt/fmt.h:24,                                                                                                                                                                                                                     
                 from src/spdlog/include/spdlog/common.h:50,
                 from src/spdlog/include/spdlog/spdlog.h:12,
                 from src/stdafx.hpp:1:                                                                                                                                                                                                                                           src/spdlog/include/spdlog/fmt/bundled/format-inl.h: In instantiation of ‘fmt::v10::detail::thousands_sep_result<Char> fmt::v10::detail::thousands_sep_impl(locale_ref) [with Char = wchar_t]’:
src/spdlog/include/spdlog/fmt/bundled/format.h:1268:37:   required from here                                                             
 1268 |   return thousands_sep_impl<wchar_t>(loc);      
      |          ~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~                                                                                                                                                                                                                                 src/spdlog/include/spdlog/fmt/bundled/format-inl.h:95:9: warning: possibly dangling reference to a temporary [-Wdangling-reference]      
   95 |   auto& facet = std::use_facet<std::numpunct<Char>>(loc.get<std::locale>());                                                     
      |         ^~~~~                                               
src/spdlog/include/spdlog/fmt/bundled/format-inl.h:95:52: note: the temporary was destroyed at the end of the full expression ‘std::use_facet<__cxx11::numpunct<wchar_t> >(fmt::v10::detail::locale_ref::get() const [with Locale = std::locale]())’             
   95 |   auto& facet = std::use_facet<std::numpunct<Char>>(loc.get<std::locale>());                                                     
      |                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~                                                      
In file included from src/spdlog/include/spdlog/fmt/bundled/format.h:4530,                                                                                                                                                                                                        
                 from src/spdlog/include/spdlog/fmt/bundled/core.h:2967,                                                                 
                 from src/spdlog/include/spdlog/fmt/fmt.h:24,
                 from src/spdlog/include/spdlog/common.h:50,                                                                                                                                                                                                                                       from src/spdlog/include/spdlog/spdlog.h:12,        
                 from src/stdafx.hpp:1:        
src/spdlog/include/spdlog/fmt/bundled/format-inl.h: In instantiation of ‘fmt::v10::detail::thousands_sep_result<Char> fmt::v10::detail::thousands_sep_impl(locale_ref) [with Char = wchar_t]’:
src/spdlog/include/spdlog/fmt/bundled/format.h:1268:37:   required from here                                                                                                                                                                                                       1268 |   return thousands_sep_impl<wchar_t>(loc);                                                                                       
      |          ~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~                                                                                        
src/spdlog/include/spdlog/fmt/bundled/format-inl.h:95:9: warning: possibly dangling reference to a temporary [-Wdangling-reference]      
   95 |   auto& facet = std::use_facet<std::numpunct<Char>>(loc.get<std::locale>());                                                     
      |         ^~~~~                                               
src/spdlog/include/spdlog/fmt/bundled/format-inl.h:95:52: note: the temporary was destroyed at the end of the full expression ‘std::use_facet<__cxx11::numpunct<wchar_t> >(fmt::v10::detail::locale_ref::get() const [with Locale = std::locale]())’
   95 |   auto& facet = std::use_facet<std::numpunct<Char>>(loc.get<std::locale>());                                                     
      |                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~                                                      
src/spdlog/include/spdlog/fmt/bundled/format-inl.h: In instantiation of ‘fmt::v10::detail::thousands_sep_result<Char> fmt::v10::detail::thousands_sep_impl(locale_ref) [with Char = char]’:
src/spdlog/include/spdlog/fmt/bundled/format.h:1263:41:   required from ‘fmt::v10::detail::thousands_sep_result<Char> fmt::v10::detail::thousands_sep(locale_ref) [with Char = char]’                                                            
 1263 |   auto result = thousands_sep_impl<char>(loc);                                                                                   
      |                 ~~~~~~~~~~~~~~~~~~~~~~~~^~~~~                                                                                    
src/spdlog/include/spdlog/fmt/bundled/format.h:2033:35:   required from ‘fmt::v10::detail::digit_grouping<Char>::digit_grouping(fmt::v10::detail::locale_ref, bool) [with Char = char]’
 2033 |     auto sep = thousands_sep<Char>(loc);     
      |                ~~~~~~~~~~~~~~~~~~~^~~~~      
src/spdlog/include/spdlog/fmt/bundled/format.h:2665:21:   required from ‘OutputIt fmt::v10::detail::do_write_float(OutputIt, const DecimalFP&, const fmt::v10::format_specs<Char>&, float_specs, locale_ref) [with OutputIt = fmt::v10::appender; DecimalFP = dragonbox::decimal_f
p<float>; Char = char; Grouping = digit_grouping<char>]’            
 2665 |     auto grouping = Grouping(loc, fspecs.locale);
      |                     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~     
src/spdlog/include/spdlog/fmt/bundled/format.h:2730:26:   required from ‘OutputIt fmt::v10::detail::write_float(OutputIt, const DecimalFP&, const fmt::v10::format_specs<Char>&, float_specs, locale_ref) [with OutputIt = fmt::v10::appender; DecimalFP = dragonbox::decimal_fp<f
loat>; Char = char]’                                                
 2730 |     return do_write_float(out, f, specs, fspecs, loc);
      |            ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~       
src/spdlog/include/spdlog/fmt/bundled/format.h:3665:21:   required from ‘OutputIt fmt::v10::detail::write(OutputIt, T) [with Char = char; OutputIt = fmt::v10::appender; T = float; typename std::enable_if<is_fast_float<T>::value, int>::type <anonymous> = 0]’
 3665 |   return write_float(out, dec, specs, fspecs, {});

The last commit on this branch adds the precompiled header. To get a clean build, use the previous commit without the precompiled header:

1. git checkout HEAD^
2. make clean && make -j

[tt4g]

All files under directory include/spdlog/fmt/bundled are copied from the fmt repository.
Please report them in the fmt repository.