> For late generated vector types this might result in inconsistencies with
> early (user) generated types when using LTO.

Is that a problem?  That's no different with regular array types.

> Is there context available somehow so we can do like the is_<LANG> overloads
> on a decl and use a default according to that?

Not sure, the only safe thing to do would be to return -1 as the default lower 
bound if flag_generate_lto.

-- 
Eric Botcazou


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