There are some legitimate reasons for leaving -Werror enabled all the time. In the embedded world, for example, I'm less interested in supporting a wide variety

There are some legitimate reasons for leaving -Werror enabled all the time. In the embedded world, for example, I'm less interested in supporting a wide variety of compilers, and more interested in rigidly complying with my particular toolchain's definition of "correct." In that case, I'm going to ask it to be as pedantic as possible because I'm never going to compile the code with any other toolchain, and I'd like to minimise the possibility of a bug because the code is going somewhere that a human won't be able to follow.