disable message counter feature in tweakme.h

include/spdlog/details/logger_impl.h

@@ -65,7 +65,11 @@ inline void spdlog::logger::log(level::level_enum lvl, const char* fmt, const Ar
     {
         details::log_msg log_msg(&_name, lvl);
         log_msg.raw.write(fmt, args...);
+
+#if defined(SPDLOG_ENABLE_MESSAGE_COUNTER)
         log_msg.msg_id = _msg_counter.fetch_add(1, std::memory_order_relaxed);
+#endif
+
         _sink_it(log_msg);
     }
     catch (const std::exception &ex)
@@ -86,7 +90,11 @@ inline void spdlog::logger::log(level::level_enum lvl, const char* msg)
     {
         details::log_msg log_msg(&_name, lvl);
         log_msg.raw << msg;
+
+#if defined(SPDLOG_ENABLE_MESSAGE_COUNTER)
         log_msg.msg_id = _msg_counter.fetch_add(1, std::memory_order_relaxed);
+#endif
+
         _sink_it(log_msg);
     }
     catch (const std::exception &ex)
@@ -108,7 +116,9 @@ inline void spdlog::logger::log(level::level_enum lvl, const T& msg)
     {
         details::log_msg log_msg(&_name, lvl);
         log_msg.raw << msg;
+#if defined(SPDLOG_ENABLE_MESSAGE_COUNTER)
         log_msg.msg_id = _msg_counter.fetch_add(1, std::memory_order_relaxed);
+#endif
         _sink_it(log_msg);
     }
     catch (const std::exception &ex)

include/spdlog/details/pattern_formatter_impl.h

@@ -652,9 +652,11 @@ inline void spdlog::pattern_formatter::handle_flag(char flag)
         _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::pid_formatter()));
         break;
 
+#if defined(SPDLOG_ENABLE_MESSAGE_COUNTER)
     case ('i'):
         _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::i_formatter()));
         break;
+#endif
 
     default: //Unknown flag appears as is
         _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::ch_formatter('%')));

include/spdlog/tweakme.h

@@ -120,3 +120,10 @@
 //
 // #define SPDLOG_FINAL final
 ///////////////////////////////////////////////////////////////////////////////
+
+///////////////////////////////////////////////////////////////////////////////
+// Uncomment to enable message counting feature. Adds %i logger pattern that 
+// prints log message sequence id.
+//
+// #define SPDLOG_ENABLE_MESSAGE_COUNTER
+///////////////////////////////////////////////////////////////////////////////