Warn if a global function has no previous declaration

[stockfish] / src / Makefile

diff --git a/src/Makefile b/src/Makefile
index d4f089ee4236d8ec7b64d84d771d8e7491eb194c..30c1be5ee527f85d3413ee525d646e5e90f759a6 100644 (file)
--- a/src/Makefile
+++ b/src/Makefile
@@ -366,7 +366,7 @@ endif
 ifeq ($(COMP),gcc)
        comp=gcc
        CXX=g++
-       CXXFLAGS += -pedantic -Wextra -Wshadow
+       CXXFLAGS += -pedantic -Wextra -Wshadow -Wmissing-declarations
 
        ifeq ($(arch),$(filter $(arch),armv7 armv8 riscv64))
                ifeq ($(OS),Android)
@@ -410,7 +410,7 @@ ifeq ($(COMP),mingw)
                        CXX=i686-w64-mingw32-c++-posix
                endif
        endif
-       CXXFLAGS += -pedantic -Wextra -Wshadow
+       CXXFLAGS += -pedantic -Wextra -Wshadow -Wmissing-declarations
 endif
 
 ifeq ($(COMP),icc)
@@ -426,7 +426,7 @@ ifeq ($(COMP),clang)
                CXX=x86_64-w64-mingw32-clang++
        endif
 
-       CXXFLAGS += -pedantic -Wextra -Wshadow
+       CXXFLAGS += -pedantic -Wextra -Wshadow -Wmissing-prototypes
 
        ifeq ($(filter $(KERNEL),Darwin OpenBSD FreeBSD),)
        ifeq ($(target_windows),)