Bug #53445 Build with -Wall and fix warnings that it generates

Post-push fix: -Wall implies -Wunused on some platforms,
which will generate thousands of warnings about unused parameters.


configure.cmake:
  Do not warn about unused parameters in C++

configure.cmake

@@ -56,7 +56,7 @@ ENDIF()
 
 # Always enable -Wall for gnu C/C++
 IF(CMAKE_COMPILER_IS_GNUCXX)
-  SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall")
+  SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wno-unused-parameter")
 ENDIF()
 IF(CMAKE_COMPILER_IS_GNUCC)
   SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall")