--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/clang/test/Modules/submodule-visibility-pch.c	Fri Aug 18 09:04:13 2023 +0900
@@ -0,0 +1,56 @@
+// Verify that the use of a PCH does not accidentally make modules from the PCH
+// visible to submodules when using -fmodules-local-submodule-visibility
+// and -fmodule-name to trigger a textual include.
+
+// RUN: rm -rf %t
+// RUN: split-file %s %t
+
+// First check that it works with a header
+
+// RUN: %clang_cc1 -fmodules -fmodules-cache-path=%t/cache \
+// RUN:   -fmodules-local-submodule-visibility -fimplicit-module-maps \
+// RUN:   -fmodule-name=Mod \
+// RUN:   %t/tu.c -include %t/prefix.h -I %t -verify
+
+// Now with a PCH
+
+// RUN: %clang_cc1 -fmodules -fmodules-cache-path=%t/cache \
+// RUN:   -fmodules-local-submodule-visibility -fimplicit-module-maps \
+// RUN:   -x c-header %t/prefix.h -emit-pch -o %t/prefix.pch -I %t
+
+// RUN: %clang_cc1 -fmodules -fmodules-cache-path=%t/cache \
+// RUN:   -fmodules-local-submodule-visibility -fimplicit-module-maps \
+// RUN:   -fmodule-name=Mod \
+// RUN:   %t/tu.c -include-pch %t/prefix.pch -I %t -verify
+
+//--- module.modulemap
+module ModViaPCH { header "ModViaPCH.h" }
+module ModViaInclude { header "ModViaInclude.h" }
+module Mod { header "Mod.h" }
+module SomeOtherMod { header "SomeOtherMod.h" }
+
+//--- ModViaPCH.h
+#define ModViaPCH 1
+
+//--- ModViaInclude.h
+#define ModViaInclude 2
+
+//--- SomeOtherMod.h
+// empty
+
+//--- Mod.h
+#include "SomeOtherMod.h"
+#ifdef ModViaPCH
+#error "Visibility violation ModViaPCH"
+#endif
+#ifdef ModViaInclude
+#error "Visibility violation ModViaInclude"
+#endif
+
+//--- prefix.h
+#include "ModViaPCH.h"
+
+//--- tu.c
+#include "ModViaInclude.h"
+#include "Mod.h"
+// expected-no-diagnostics