[RFC 05/12] Add warning for mutually exclusive attributes

[Connor Kuehl via cfe-commits]

Co-authored-by: Cole Nixon <nixontcole at gmail.com>
Co-authored-by: Connor Kuehl <cipkuehl at gmail.com>
Co-authored-by: James Foster <jafosterja at gmail.com>
Co-authored-by: Jeff Takahashi <jeffrey.takahashi at gmail.com>
Co-authored-by: Jordan Cantrell <jordan.cantrell at mail.com>
Co-authored-by: Nikk Forbus <nicholas.forbus at gmail.com>
Co-authored-by: Tim Pugh <nwtpugh at gmail.com>
---
 clang/include/clang/Basic/DiagnosticASTKinds.td | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/clang/include/clang/Basic/DiagnosticASTKinds.td b/clang/include/clang/Basic/DiagnosticASTKinds.td
index 406325d3677..e0970a7b145 100644
--- a/clang/include/clang/Basic/DiagnosticASTKinds.td
+++ b/clang/include/clang/Basic/DiagnosticASTKinds.td
@@ -345,4 +345,7 @@ def warn_unnecessary_packed : Warning<
   "packed attribute is unnecessary for %0">, InGroup<Packed>, DefaultIgnore;
 def warn_randomize_attr_union : Warning<
   "union declared with 'randomize_layout' attribute">, InGroup<DiagGroup<"randomize-layout">>;
+def warn_randomize_attr_conflict : Warning<
+  "struct declared with 'randomize_layout' and 'no_randomize_layout' attributes; "
+  "attribute 'no_randomize_layout' takes precedence">, InGroup<DiagGroup<"no-randomize-layout">>;
 }
-- 
2.17.1