Is it time to --enable-warnings?

[Hal Murray]

Thanks.

Gary said:
>> Should we be running with -Werror
>> to turn warnings into errors so gitlab/CI will notice?  Any reason
>> not to do that?
> Try it and see.  If the makes the CI look terrible, turn it back off. 

We still have the warning from old old Bison.
  warning: switch missing default case [-Wswitch-default]

I'll turn it on and add an option to turn it off.
Then turn it off where needed in the CI.

I'll also change --enable-warnings to default to on.



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