There needs to be a way to disable warnings produced from source files generated by lex/yacc

If a project is using code generation, generated artifacts are auto inserted into build graph and user has no control over the properties of individual files. Therefore, there currently is no way to selectively suppress warnings for, say, bizon/flex generated source code. This leaves people no other choice than to suppress the warning for the whole project if they want a warningless build.

Probably something should be done about that.