erik.pilkington added a comment.

This seems pretty reasonable to me. I agree that a more general mechanism to 
override #pca (/implicit) attributes would be pretty useful, but I guess there 
is no need to jump the gun on that.



================
Comment at: include/clang/Sema/Sema.h:2471
+    /// declaration.
+    AP_Explicit,
+
----------------
Maybe add `= 0` (and `=1` and `=2`) explicitly to indicate that their relative 
values matter here.


================
Comment at: lib/Sema/SemaDeclAttr.cpp:2479
+  int PriorityModifier =
+      AL.isPragmaClangAttribute() ? Sema::AP_PragmaClangAttribute : 0;
+  AvailabilityAttr *NewAttr = S.mergeAvailabilityAttr(
----------------
Use AP_Explicit here instead of 0?


================
Comment at: lib/Sema/SemaDeclAttr.cpp:2483
+      Deprecated.Version, Obsoleted.Version, IsUnavailable, Str, IsStrict,
+      Replacement, Sema::AMK_None, PriorityModifier + Sema::AP_Explicit, 
Index);
   if (NewAttr)
----------------
... And the avoid adding it back on here?


Repository:
  rC Clang

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D56892/new/

https://reviews.llvm.org/D56892



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