Broken under macOS 27/Xcode 27

[ospfranco]

Environment

npm ls react-native-macos: 0.81.6

Steps to reproduce the bug

I know it's not a priority to fix builds for beta software, but consider this just an advisory. Build is broken on Xcode 27 with:

/Users/osp/Developer/sol/macos/Pods/fmt/include/fmt/format-inl.h:59:24 Call to consteval function 'fmt::basic_format_string<char, fmt::basic_string_view<char> &, const char (&)[3]>::basic_format_string<FMT_COMPILE_STRING, 0>' is not a constant expression

/Users/osp/Developer/sol/macos/Pods/fmt/include/fmt/format-inl.h:60:22 Call to consteval function 'fmt::basic_format_string<char, const char (&)[7], int &>::basic_format_string<FMT_COMPILE_STRING, 0>' is not a constant expression

/Users/osp/Developer/sol/macos/Pods/fmt/include/fmt/format-inl.h:1387:35 Call to consteval function 'fmt::basic_format_string<char, unsigned int &>::basic_format_string<FMT_COMPILE_STRING, 0>' is not a constant expression

/Users/osp/Developer/sol/macos/Pods/fmt/include/fmt/format-inl.h:1391:33 Call to consteval function 'fmt::basic_format_string<char, unsigned int &>::basic_format_string<FMT_COMPILE_STRING, 0>' is not a constant expression

/Users/osp/Developer/sol/macos/Pods/fmt/include/fmt/format-inl.h:1394:33 Call to consteval function 'fmt::basic_format_string<char, int>::basic_format_string<FMT_COMPILE_STRING, 0>' is not a constant expression

Expected Behavior

No response

Actual Behavior

No response

Reproducible Demo

No response

Additional context

No response

[ospfranco]

Workaround from podfile, seems to be forcing C++ 17 version, so it's a bump in the C++ compiler that is causing the error.

def disable_fmt_consteval!(installer)
  installer.pods_project.targets.each do |target|
    target.build_configurations.each do |config|
      next unless target.name == 'fmt'

      config.build_settings['CLANG_CXX_LANGUAGE_STANDARD'] = 'gnu++17'
    end
  end
end

[Saadnajmi]

Does #2961 fix it? I think upstream updates fmt to 12.0, which I may pick up too