rjmccall added inline comments. ================ Comment at: include/clang/Basic/DiagnosticSemaKinds.td:2790 @@ -2790,1 +2789,3 @@ + "version 4.4 - the newer offset is used here">, + InGroup<DiagGroup<"attribute-packed-for-bitfield-offset-changed">>; def warn_transparent_union_attribute_field_size_align : Warning< ---------------- No, this diagnostic shouldn't make such an affirmative statement about the offset changing. I would instead suggest: warning: 'packed' attribute was ignored on bit-fields with alignment 1 in older versions of GCC and Clang
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