4 files changed, 42 insertions, 0 deletions
diff --git a/clang/test/Modules/Inputs/merge-vtable-codegen/a.h b/clang/test/Modules/Inputs/merge-vtable-codegen/a.h
new file mode 100644
index 00000000000..c2885379aa4
--- /dev/null
+++ b/clang/test/Modules/Inputs/merge-vtable-codegen/a.h
@@ -0,0 +1,8 @@
+#ifndef A_H
+#define A_H
+
+struct A {
+  virtual void x();
+};
+
+#endif
diff --git a/clang/test/Modules/Inputs/merge-vtable-codegen/b.h b/clang/test/Modules/Inputs/merge-vtable-codegen/b.h
new file mode 100644
index 00000000000..770e46077f9
--- /dev/null
+++ b/clang/test/Modules/Inputs/merge-vtable-codegen/b.h
@@ -0,0 +1,17 @@
+#ifndef B_H
+#define B_H
+
+#include "a.h"
+
+class B : virtual public A {
+  virtual void x() {}
+};
+
+void b(A* p) {
+  p->x();
+  // Instantiating a class that virtually inherits 'A'
+  // triggers calculation of the vtable offsets in 'A'.
+  B b;
+}
+
+#endif
diff --git a/clang/test/Modules/Inputs/merge-vtable-codegen/c.h b/clang/test/Modules/Inputs/merge-vtable-codegen/c.h
new file mode 100644
index 00000000000..40cbbb047cb
--- /dev/null
+++ b/clang/test/Modules/Inputs/merge-vtable-codegen/c.h
@@ -0,0 +1,6 @@
+#ifndef C_H
+#define C_H
+
+#include "a.h"
+
+#endif
diff --git a/clang/test/Modules/Inputs/merge-vtable-codegen/merge-vtable-codegen.modulemap b/clang/test/Modules/Inputs/merge-vtable-codegen/merge-vtable-codegen.modulemap
new file mode 100644
index 00000000000..1edaa07101f
--- /dev/null
+++ b/clang/test/Modules/Inputs/merge-vtable-codegen/merge-vtable-codegen.modulemap
@@ -0,0 +1,11 @@
+module "a" {
+  textual header "a.h"
+}
+
+module "b" {
+  header "b.h"
+}
+
+module "c" {
+  header "c.h"
+}