m4: enforce that all enum cases are listed in switch statements
As a general rule any time we switch() on something that is an enum, we want to have a case for every enum constant. The -Wswitch warning will report any switch where we've violated this rule, except if that switch has a default case. Unfortunately it is reasonable to want to list all enum constants *and* also have a default case. To get a warning in that scenario requires that we turn on -Wswitch-enum. In a few cases where we explicitly don't want to list all enum cases, we can discard the enum type checking by casting the value to a plain int. Reviewed-by: NJohn Ferlan <jferlan@redhat.com> Signed-off-by: NDaniel P. Berrangé <berrange@redhat.com>
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