erichkeane added inline comments.
================
Comment at: clang/include/clang/Basic/Attr.td:1690
+def NoUniqueAddress : InheritableAttr {
let Spellings = [CXX11<"", "no_unique_address", 201803>];
let Subjects = SubjectList<[NonBitField], ErrorDiag>;
----------------
The way to do a `[[msvc::no_unique_address]]` is likely to create a new
attribute here in Attr.td, then make the spelling be something like:
`let Spellings = [CXX11<"msvc", "no_unique_address", N>];`
Where `N` is a number that is the value of `__has_attribute` (which I note that
MSVC has yet to implement?).
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D110485/new/
https://reviews.llvm.org/D110485
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