Index: lib/AST/ASTImporter.cpp
===================================================================
--- lib/AST/ASTImporter.cpp
+++ lib/AST/ASTImporter.cpp
@@ -283,6 +283,7 @@
     Expr *VisitCXXDefaultInitExpr(CXXDefaultInitExpr *E);
     Expr *VisitCXXNamedCastExpr(CXXNamedCastExpr *E);
     Expr *VisitSubstNonTypeTemplateParmExpr(SubstNonTypeTemplateParmExpr *E);
+    Expr *VisitTypeTraitExpr(TypeTraitExpr *E);
 
 
     template<typename IIter, typename OIter>
@@ -5612,6 +5613,28 @@
         Replacement);
 }
 
+Expr *ASTNodeImporter::VisitTypeTraitExpr(TypeTraitExpr *E) {
+  QualType ToType = Importer.Import(E->getType());
+  if (ToType.isNull())
+    return nullptr;
+
+  SmallVector<TypeSourceInfo *, 4> ToArgVec;
+  for (auto FromArg : E->getArgs()) {
+    TypeSourceInfo *ToTI = Importer.Import(FromArg);
+    if (!ToTI)
+      return nullptr;
+    ToArgVec.push_back(ToTI);
+  }
+
+  // According to Sema::BuildTypeTrait(), if E is value-dependent,
+  // Value is always false.
+  bool ToValue = (!E->isValueDependent()) ? E->getValue() : false;
+
+  return TypeTraitExpr::Create(
+      Importer.getToContext(), ToType, Importer.Import(E->getLocStart()),
+      E->getTrait(), ToArgVec, Importer.Import(E->getLocEnd()), ToValue);
+}
+
 void ASTNodeImporter::ImportOverrides(CXXMethodDecl *ToMethod,
                                       CXXMethodDecl *FromMethod) {
   for (auto *FromOverriddenMethod : FromMethod->overridden_methods())
Index: unittests/AST/ASTImporterTest.cpp
===================================================================
--- unittests/AST/ASTImporterTest.cpp
+++ unittests/AST/ASTImporterTest.cpp
@@ -525,6 +525,27 @@
                                          declRefExpr()))))))))));
 }
 
+/// \brief Matches __builtin_types_compatible_p:
+/// GNU extension to check equivalent types
+/// Given
+/// \code
+///   __builtin_types_compatible_p(int, int)
+/// \endcode
+//  will generate TypeTraitExpr <...> 'int'
+const internal::VariadicDynCastAllOfMatcher<Stmt, TypeTraitExpr> typeTraitExpr;
+
+TEST(ImportExpr, ImportTypeTraitExpr) {
+  MatchVerifier<Decl> Verifier;
+  EXPECT_TRUE(testImport("void declToImport() { "
+                         "  __builtin_types_compatible_p(int, int);"
+                         "}",
+                         Lang_C, "", Lang_C, Verifier,
+                         functionDecl(
+                           hasBody(
+                             compoundStmt(
+                               has(
+                                 typeTraitExpr(hasType(asString("int")))))))));
+}
 
 } // end namespace ast_matchers
 } // end namespace clang