rjmccall added a comment. As far as I'm concerned as editor of the Itanium ABI, the ABI treatment of trivial-for-the-purposes-of-calls classes is purely a psABI matter, and the Itanium ABI's wording around empty classes is merely a suggestion if the psABI doesn't have more specific rules (because empty structs are normally invalid in C). Do what you think is best for your ABI.
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