Reverted some external template declarations

include/spdlog/common.h

@@ -243,7 +243,4 @@ std::unique_ptr<T> make_unique(Args &&... args)
 
 #ifdef SPDLOG_HEADER_ONLY
 #include "common-inl.h"
-#else
-extern template class fmt::basic_string_view<char>;
-extern template class fmt::basic_memory_buffer<char, 250>;
 #endif

include/spdlog/details/backtracer.h

@@ -43,6 +43,4 @@ public:
 
 #ifdef SPDLOG_HEADER_ONLY
 #include "backtracer-inl.h"
-#else
-extern template class spdlog::details::circular_q<spdlog::details::log_msg_buffer>;
 #endif

src/spdlog.cpp

@@ -22,8 +22,5 @@
 
 // template instantiate logger constructor with sinks init list
 template spdlog::logger::logger(std::string name, sinks_init_list::iterator begin, sinks_init_list::iterator end);
-template class spdlog::details::circular_q<spdlog::details::log_msg_buffer>;
 template class spdlog::sinks::base_sink<std::mutex>;
 template class spdlog::sinks::base_sink<spdlog::details::null_mutex>;
-template class fmt::basic_string_view<char>;
-template class fmt::basic_memory_buffer<char, 250>;