1 files changed, 15 insertions, 0 deletions
diff --git a/lib/Sema/SemaType.cpp b/lib/Sema/SemaType.cpp
index 8c8402e75e..b19dcb2a50 100644
--- a/lib/Sema/SemaType.cpp
+++ b/lib/Sema/SemaType.cpp
@@ -15,6 +15,7 @@
 #include "clang/AST/ASTConsumer.h"
 #include "clang/AST/ASTContext.h"
 #include "clang/AST/ASTMutationListener.h"
+#include "clang/AST/ASTStructuralEquivalence.h"
 #include "clang/AST/CXXInheritance.h"
 #include "clang/AST/DeclObjC.h"
 #include "clang/AST/DeclTemplate.h"
@@ -7111,6 +7112,20 @@ bool Sema::RequireCompleteType(SourceLocation Loc, QualType T,
   return false;
 }
 
+bool Sema::hasStructuralCompatLayout(Decl *D, Decl *Suggested) {
+  llvm::DenseSet<std::pair<Decl *, Decl *>> NonEquivalentDecls;
+  if (!Suggested)
+    return false;
+
+  // FIXME: Add a specific mode for C11 6.2.7/1 in StructuralEquivalenceContext
+  // and isolate from other C++ specific checks.
+  StructuralEquivalenceContext Ctx(
+      D->getASTContext(), Suggested->getASTContext(), NonEquivalentDecls,
+      false /*StrictTypeSpelling*/, true /*Complain*/,
+      true /*ErrorOnTagTypeMismatch*/);
+  return Ctx.IsStructurallyEquivalent(D, Suggested);
+}
+
 /// \brief Determine whether there is any declaration of \p D that was ever a
 ///        definition (perhaps before module merging) and is currently visible.
 /// \param D The definition of the entity.