[CMAKE] Silence warnings about unused variables on release builds

Author: tkreuzer

sdk/cmake/gcc.cmake

@@ -142,6 +142,8 @@ endif()
 # FIXME: Revisit this to see if we even need these levels
 if(CMAKE_BUILD_TYPE STREQUAL "Release")
     add_compile_options(-O2 -DNDEBUG=)
+    add_compile_options(-Wno-unused-variable)
+    add_compile_options(-Wno-unused-but-set-variable)
 else()
     if(OPTIMIZE STREQUAL "1")
         add_compile_options(-Os)