aaron.ballman added inline comments.
================
Comment at: include/clang/Basic/DiagnosticSemaKinds.td:2258
@@ -2257,1 +2257,3 @@
"uuid attribute contains a malformed GUID">;
+def err_mismatched_uuid : Error<"uiid does not match previous declaration">;
+def note_previous_uuid : Note<"previous uuid specified here">;
----------------
uuid instead of uiid.
================
Comment at: lib/Parse/ParseDecl.cpp:1476
@@ +1475,3 @@
+ // Find end of type attributes Attrs and add NewTypeAttributes in the same
+ // order they were in originally. (Remember, in AttributeList things earlier
+ // in source order are later in the list, since new attributes are added to
----------------
Remove double space here.
================
Comment at: lib/Sema/SemaDecl.cpp:2255
@@ -2249,1 +2254,3 @@
+ // previous decl", for example if the attribute needs to be consistent
+ // between redeclarations, you need to call a custom merge function here.
InheritableAttr *NewAttr = nullptr;
----------------
Thank you for the improved comments as a drive-by.
================
Comment at: lib/Sema/SemaDeclAttr.cpp:4609
@@ +4608,3 @@
+ unsigned AttrSpellingListIndex, StringRef Uuid) {
+ if (UuidAttr *UA = D->getAttr<UuidAttr>()) {
+ if (UA->getGuid() == Uuid)
----------------
Can use `const auto *` here.
Also, don't you need to iterate over all of the `UuidAttr` objects attached to
the declaration to see if any of them match, rather than just the first?
https://reviews.llvm.org/D24469
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