1 files changed, 48 insertions, 0 deletions
diff --git a/test/Modules/redefinition-c-tagtypes.m b/test/Modules/redefinition-c-tagtypes.m
new file mode 100644
index 0000000000..a01f11bd74
--- /dev/null
+++ b/test/Modules/redefinition-c-tagtypes.m
@@ -0,0 +1,48 @@
+// RUN: rm -rf %t.cache
+// RUN: %clang_cc1 -fsyntax-only %s -fmodules -fmodules-cache-path=%t.cache \
+// RUN:   -fimplicit-module-maps -F%S/Inputs -verify
+// RUN: %clang_cc1 -fsyntax-only %s -fmodules -fmodules-cache-path=%t.cache \
+// RUN:   -fimplicit-module-maps -F%S/Inputs -DCHANGE_TAGS -verify
+#include "F/F.h"
+
+#ifndef CHANGE_TAGS
+// expected-no-diagnostics
+#endif
+
+struct NS {
+  int a;
+#ifndef CHANGE_TAGS
+  int b;
+#else
+  int c; // expected-note {{field has name 'c' here}}
+  // expected-error@redefinition-c-tagtypes.m:12 {{type 'struct NS' has incompatible definitions}}
+  // expected-note@Inputs/F.framework/PrivateHeaders/NS.h:3 {{field has name 'b' here}}
+#endif
+};
+
+enum NSE {
+  FST = 22,
+#ifndef CHANGE_TAGS
+  SND = 43,
+#else
+  SND = 44, // expected-note {{enumerator 'SND' with value 44 here}}
+  // expected-error@redefinition-c-tagtypes.m:23 {{type 'enum NSE' has incompatible definitions}}
+  // expected-note@Inputs/F.framework/PrivateHeaders/NS.h:8 {{enumerator 'SND' with value 43 here}}
+#endif
+  TRD = 55
+};
+
+#define NS_ENUM(_type, _name) \
+  enum _name : _type _name;   \
+  enum _name : _type
+
+typedef NS_ENUM(int, NSMyEnum) {
+  MinX = 11,
+#ifndef CHANGE_TAGS
+  MinXOther = MinX,
+#else
+  MinXOther = TRD, // expected-note {{enumerator 'MinXOther' with value 55 here}}
+  // expected-error@redefinition-c-tagtypes.m:39 {{type 'enum NSMyEnum' has incompatible definitions}}
+  // expected-note@Inputs/F.framework/PrivateHeaders/NS.h:18 {{enumerator 'MinXOther' with value 11 here}}
+#endif
+};