enable final keyword by default. Can be disabled in tweakme.h for older compilers

include/spdlog/common.h

@@ -29,9 +29,11 @@
 #define SPDLOG_CONSTEXPR constexpr
 #endif
 
-// See tweakme.h
-#if !defined(SPDLOG_FINAL)
+// final keyword support. On by default. See tweakme.h
+#if defined(SPDLOG_NO_FINAL)
 #define SPDLOG_FINAL
+#else
+#define SPDLOG_FINAL final
 #endif
 
 #if defined(__GNUC__)  || defined(__clang__)

include/spdlog/tweakme.h

@@ -126,11 +126,12 @@
 
 
 ///////////////////////////////////////////////////////////////////////////////
-// Uncomment to mark some types as final, allowing more optimizations in release
+// Uncomment if your compiler doesn't support the "final" keyword.
+// The final keyword allows more optimizations in release
 // mode with recent compilers. See GCC's documentation for -Wsuggest-final-types
 // for instance.
 //
-// #define SPDLOG_FINAL final
+// #define SPDLOG_NO_FINAL
 ///////////////////////////////////////////////////////////////////////////////
 
 
@@ -141,6 +142,7 @@
 // #define SPDLOG_ENABLE_MESSAGE_COUNTER
 ///////////////////////////////////////////////////////////////////////////////
 
+
 ///////////////////////////////////////////////////////////////////////////////
 // Uncomment to customize level names (e.g. "MT TRACE")
 //