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fix(folding): correct unique object rep checks [] - #326
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jakub-labenski wants to merge 1 commit into
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Fix __has_unique_object_representations for several cases: - A base class with no direct nonstatic data members that inherits some (and is thus not empty) was treated as an empty base. Its size was counted as tail padding, making the trait incorrectly FALSE for derived classes. Use is_empty_class_type instead of checking for an empty field list. - Treat unnamed bit-fields of nonzero width as padding in Clang 17+ and g++ 13.1+ (also g++ 10.5, 11.4, 12.3 backports). - Restrict treating volatile-qualified non-class types as lacking unique object representations to g++ modes before version 10, and no longer apply it in Clang modes. Add regression test has-unique-object-rep-inherited-base and update expectations for imported Clang type-traits and g++ has-unique-obj-representations3 tests.
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Discussion: #290
Fix __has_unique_object_representations for several cases:
A base class with no direct nonstatic data members that inherits some (and is thus not empty) was treated as an empty base. Its size was counted as tail padding, making the trait incorrectly FALSE for derived classes. Use is_empty_class_type instead of checking for an empty field list.
Treat unnamed bit-fields of nonzero width as padding in Clang 17+ and g++ 13.1+ (also g++ 10.5, 11.4, 12.3 backports).
Restrict treating volatile-qualified non-class types as lacking unique object representations to g++ modes before version 10, and no longer apply it in Clang modes.
Add regression test has-unique-object-rep-inherited-base and update expectations for imported Clang type-traits and g++ has-unique-obj-representations3 tests.