initializer for struct with anonymous union.

[Danni Coy]

On Sat, Apr 11, 2026 at 4:39 PM Danni Coy <danni.coy at gmail.com> wrote:

> On Sat, Apr 11, 2026 at 4:18 PM Danni Coy <danni.coy at gmail.com> wrote:
>
>> I currently have a linker error telling me
>>
>> undefined reference to `initializer for event.Event`
>>
>> Event is a struct with a union. Something Like
>>
>> struct Event
>> {
>>     EventType type;
>>     union
>>     {
>>         EventA a;
>>         EventB b;
>>     }
>> }
>>
>> Naming the union makes the linker errors go away.
>> Can anybody tell me what is going on here?
>>
>
> ok with further investigation, linker errors come back as soon as I add
> the union into the struct.
>
> eg
>   union u
>   {...
>   ...}
>   u event;
> }
>
> why would my struct now no longer have an initializer?
>

ok gets weirder - adding an int  to the beginning of the anonymous union
removes the linker problem.

union
{
     int _;
    EventA a;
    EventB b;
}

Is this a bug, or is there something I am missing?
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