revert change in main cmakefile

Author: addam128

CMakeLists.txt

@@ -30,7 +30,7 @@ if (MSVC)
     set(CMAKE_CXX_FLAGS "/W4 /EHsc")
 else()
     # Linux and Apple
-    set(CMAKE_CXX_FLAGS "-Wextra -Wall -Wconversion -Wdouble-promotion -Wno-unused-parameter -Wno-unused-function -Wno-sign-conversion")
+    set(CMAKE_CXX_FLAGS "-Wextra -Wall -Wextra -Wconversion -Wdouble-promotion -Wno-unused-parameter -Wno-unused-function -Wno-sign-conversion")
 endif()
 
 if(CMAKE_C_COMPILER_ID STREQUAL "Clang" OR CMAKE_C_COMPILER_ID STREQUAL "GNU")