db9d37edab
GCC 5 is able to prove that in some translation units the static Logger instance is defined but never used, and generates an unused variable warning for each one of them. These warnings become fatal errors when building in debug mode, due to -Werror. Silence the compiler by not declaring the unused variables. refs #2767 Change-Id: Icacc579d917d660582221ef090954ec827f46149