# appears in gcc 5.0 and (with modification) in 5.1, making it necessary to
# determine if we are using gcc, and if so, what version because the proposed
# solution uses a nonstandard option.
# appears in gcc 5.0 and (with modification) in 5.1, making it necessary to
# determine if we are using gcc, and if so, what version because the proposed
# solution uses a nonstandard option.