Implicit Instantiation of undefined template

[joe31093]

I recently updated my spdlog version on my Mac (M3, Xcode 16.3) with brew and broke my project. The previous version worked fined but after the update, I am getting these errors. Not sure what I am missing.

static
/usr/local/include/fmt/base.h
/usr/local/include/fmt/base.h:2235:45 Implicit instantiation of undefined template 'fmt::detail::type_is_unformattable_for<ScopeModel::STAGE_KEY_MAP, char>'

in file included from /Users/jli1/Documents/Git Repo/main/Source F2V2/OSX/ScopeControl/Source/Common/ScopeModel.cpp:9:
in file included from /Users/jli1/Documents/Git Repo/main/Source F2V2/Shared/Common/SystemLog/SystemLog.h:5:
in file included from /usr/local/include/spdlog/spdlog.h:12:
in file included from /usr/local/include/spdlog/common.h:50:
in file included from /usr/local/include/spdlog/fmt/fmt.h:28:
in file included from /usr/local/include/fmt/core.h:5:
in file included from /usr/local/include/fmt/format.h:41:
In instantiation of function template specialization 'fmt::detail::valuefmt::context::value<ScopeModel::STAGE_KEY_MAP, 0>' requested here
In instantiation of function template specialization 'fmt::detail::valuefmt::context::value<ScopeModel::STAGE_KEY_MAP, 0>' requested here
In instantiation of function template specialization 'spdlog::logger::log_<const char *, const char (&)[22], int, ScopeModel::STAGE_KEY_MAP &, char &>' requested here
In instantiation of function template specialization 'spdlog::logger::log<const char *, const char (&)[22], int, ScopeModel::STAGE_KEY_MAP &, char &>' requested here
In instantiation of function template specialization 'spdlog::logger::log<const char *, const char (&)[22], int, ScopeModel::STAGE_KEY_MAP &, char &>' requested here
In instantiation of function template specialization 'spdlog::logger::info<const char *, const char (&)[22], int, ScopeModel::STAGE_KEY_MAP &, char &>' requested here
Template is declared here

[tt4g]

The error message alone does not reveal the cause, since it is your project's source code that is specializing the template.

My guess is that ScopeModel::STAGE_KEY_MAP is an enum class, a duplicate of #3147, #3191, #3147.

[tt4g]

I can only assume that there is a problem with the definition of the custom formatter of the {fmt} library.
And I cannot help unless you can provide the source code that is causing the problem.

[joe31093]

The issue is at ScopeModel.cpp line 170 with enum type keyMapIndex. Thank you.

code.zip

[tt4g]

As noted in the duplicate issues, it will never work because you have not defined a custom formatter: https://fmt.dev/11.1/api/#formatting-user-defined-types

[tt4g]

{fmt} issue: fmtlib/fmt#3720

[joe31093]

Thank you. I appreciate the help.