You should always thoroughly check whether your program still works after upgrading the compiler. Adding a -Wno-bad-exponentation to your makefiles shouldn't be that difficult.
If you are the only one using your program, then that's probably fine. I cannot count how many times I have to patch other people's makefile so their code won't fail to compile because of some -Werror introduced in a newer version of the compiler.
I wonder if a script could be made that:
1. Adds pragmas around each error to suppress
2. Creates commit
3. Sends to upstream branch for review & triage
4. Bonus if hosted on GitHub, files an issue
