Werror of unused variables

I don’t why my replit will assume unused variable as an error? What can I do to turn this error messaage off?

Replit Profile: https://replit.com/@PaulLi9

because, often, it is an error/mistake. If you intend for a variable to be unused, best is to use e.g.:

  int foo;

alternatively, open a new tab to edit the hidden Makefile file so you can configure the warning flags.
I’d recommend creating a .ccls file containing


so the warnings in the editor are consistent with the Run button.