That's fine and dandy. It's not fine when it's an open source project from three years and four compiler versions ago that you want to compile, and find -Werror on every line invocation in a Makefile.
What you build with in-house for development/test-farms is not what you should ship as default to users of your project.
What you build with in-house for development/test-farms is not what you should ship as default to users of your project.