FMT_STATIC_THOUSANDS_SEPARATOR doesn't compile with GCC

[alabuzhev]

#define FMT_STATIC_THOUSANDS_SEPARATOR <something>

Compilation error:

format.cc: In instantiation of 'fmt::v5::internal::locale_ref::locale_ref(const Locale&) [with Locale = std::locale]':
format.cc:12:73:   required from here
format.cc:12:73: error: explicit instantiation of 'fmt::v5::internal::locale_ref::locale_ref(const Locale&) [with Locale = std::locale]' but no definition available [-fpermissive]
 template FMT_API internal::locale_ref::locale_ref(const std::locale& loc);
                                                                         ^
format.cc: In instantiation of 'Locale fmt::v5::internal::locale_ref::get() const [with Locale = std::locale]':
format.cc:13:71:   required from here
format.cc:13:71: error: explicit instantiation of 'Locale fmt::v5::internal::locale_ref::get() const [with Locale = std::locale]' but no definition available [-fpermissive]
 template FMT_API std::locale internal::locale_ref::get<std::locale>() const;
                                                                       ^~~~~

Possible fix for format.cc:

FMT_BEGIN_NAMESPACE
template struct internal::basic_data<void>;
+ #if !defined(FMT_STATIC_THOUSANDS_SEPARATOR)
template FMT_API internal::locale_ref::locale_ref(const std::locale& loc);
template FMT_API std::locale internal::locale_ref::get<std::locale>() const;
+ #endif

[vitaut]

Fixed in fdd8e33, thanks for reporting.