Warn if a global function has no previous declaration

[stockfish] / src / position.h

diff --git a/src/position.h b/src/position.h
index 078ff5b79f23e9e2d85b943734f2c4713bbbb3bd..3de24f228882d398b06e6ec8331d1b9542acac17 100644 (file)
--- a/src/position.h
+++ b/src/position.h
@@ -1,6 +1,6 @@
 /*
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
-  Copyright (C) 2004-2022 The Stockfish developers (see AUTHORS file)
+  Copyright (C) 2004-2023 The Stockfish developers (see AUTHORS file)
 
   Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -204,7 +204,7 @@ private:
   bool chess960;
 };
 
-extern std::ostream& operator<<(std::ostream& os, const Position& pos);
+std::ostream& operator<<(std::ostream& os, const Position& pos);
 
 inline Color Position::side_to_move() const {
   return sideToMove;