Nice, this is a good distinction to have.

For the record, here's some background as to how it got this way:

  [cfe-dev] -Wattributes versus -Wunknown-attributes
  http://lists.cs.uiuc.edu/pipermail/cfe-dev/2011-June/015412.html

Alp.

On 24/01/2014 14:16, Aaron Ballman wrote:
Author: aaronballman
Date: Fri Jan 24 08:16:23 2014
New Revision: 200004

URL: http://llvm.org/viewvc/llvm-project?rev=200004&view=rev
Log:
Adding a new diagnostics group (-Wattributes) which covers both 
UnknownAttributes and IgnoredAttributes.

Modified:
     cfe/trunk/include/clang/Basic/DiagnosticGroups.td

Modified: cfe/trunk/include/clang/Basic/DiagnosticGroups.td
URL: 
http://llvm.org/viewvc/llvm-project/cfe/trunk/include/clang/Basic/DiagnosticGroups.td?rev=200004&r1=200003&r2=200004&view=diff
==============================================================================
--- cfe/trunk/include/clang/Basic/DiagnosticGroups.td (original)
+++ cfe/trunk/include/clang/Basic/DiagnosticGroups.td Fri Jan 24 08:16:23 2014
@@ -340,8 +340,10 @@ def Uninitialized  : DiagGroup<"uninitia
  def UnknownPragmas : DiagGroup<"unknown-pragmas">;
  def UnknownWarningOption : DiagGroup<"unknown-warning-option">;
  def NSobjectAttribute : DiagGroup<"NSObject-attribute">;
-def UnknownAttributes : DiagGroup<"attributes">;
+def UnknownAttributes : DiagGroup<"unknown-attributes">;
  def IgnoredAttributes : DiagGroup<"ignored-attributes">;
+def Attributes : DiagGroup<"attributes", [UnknownAttributes,
+                                          IgnoredAttributes]>;
  def UnnamedTypeTemplateArgs : DiagGroup<"unnamed-type-template-args",
                                          [CXX98CompatUnnamedTypeTemplateArgs]>;
  def UnsupportedFriend : DiagGroup<"unsupported-friend">;


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