5 files changed, 14 insertions, 0 deletions
diff --git a/clang/test/Modules/Inputs/PR28438/a.h b/clang/test/Modules/Inputs/PR28438/a.h
new file mode 100644
index 00000000000..a7e26ac6cdb
--- /dev/null
+++ b/clang/test/Modules/Inputs/PR28438/a.h
@@ -0,0 +1 @@
+#define FOO
diff --git a/clang/test/Modules/Inputs/PR28438/b1.h b/clang/test/Modules/Inputs/PR28438/b1.h
new file mode 100644
index 00000000000..262976e357f
--- /dev/null
+++ b/clang/test/Modules/Inputs/PR28438/b1.h
@@ -0,0 +1,2 @@
+#define FOO
+#include "a.h"
diff --git a/clang/test/Modules/Inputs/PR28438/b2.h b/clang/test/Modules/Inputs/PR28438/b2.h
new file mode 100644
index 00000000000..e69de29bb2d
--- /dev/null
+++ b/clang/test/Modules/Inputs/PR28438/b2.h
diff --git a/clang/test/Modules/Inputs/PR28438/module.modulemap b/clang/test/Modules/Inputs/PR28438/module.modulemap
new file mode 100644
index 00000000000..cb77d47b6ce
--- /dev/null
+++ b/clang/test/Modules/Inputs/PR28438/module.modulemap
@@ -0,0 +1,2 @@
+module A { header "a.h" export * }
+module B { module B1 { header "b1.h" export * } module B2 { header "b2.h" export * } }
diff --git a/clang/test/Modules/pr28438.cpp b/clang/test/Modules/pr28438.cpp
new file mode 100644
index 00000000000..b8b9077046a
--- /dev/null
+++ b/clang/test/Modules/pr28438.cpp
@@ -0,0 +1,9 @@
+// RUN: rm -rf %t
+// RUN: %clang_cc1 -fsyntax-only -verify %s -fmodules -fmodules-cache-path=%t -I%S/Inputs/PR28438 -fimplicit-module-maps
+
+#include "a.h"
+#include "b2.h"
+
+#pragma clang __debug macro FOO
+
+FOO // xpected-no-diagnostics