2 files changed, 40 insertions, 2 deletions
diff --git a/clang/test/Driver/cl-pch.cpp b/clang/test/Driver/cl-pch.cpp
index 19ef0926854..2503c973733 100644
--- a/clang/test/Driver/cl-pch.cpp
+++ b/clang/test/Driver/cl-pch.cpp
@@ -10,7 +10,7 @@
 // CHECK-YC: -o
 // CHECK-YC: pchfile.pch
 // CHECK-YC: -x
-// CHECK-YC: "c++"
+// CHECK-YC: "c++-header"
 // 2. Use .pch file.
 // CHECK-YC: cc1
 // CHECK-YC: -emit-obj
@@ -158,7 +158,7 @@
 // CHECK-YCFIFIFI: -o
 // CHECK-YCFIFIFI: foo2.pch
 // CHECK-YCFIFIFI: -x
-// CHECK-YCFIFIFI: "c++"
+// CHECK-YCFIFIFI: "c++-header"
 // CHECK-YCFIFIFI: foo2.h
 // 2. Use .pch file: Inlucdes foo2.pch and foo3.h
 // CHECK-YCFIFIFI: cc1
diff --git a/clang/test/Driver/modules-ts.cpp b/clang/test/Driver/modules-ts.cpp
new file mode 100644
index 00000000000..0fdc61b6f9c
--- /dev/null
+++ b/clang/test/Driver/modules-ts.cpp
@@ -0,0 +1,38 @@
+// Check compiling a module interface to a .pcm file.
+//
+// RUN: %clang -fmodules-ts -x c++-module --precompile %s -Dimplementation= -o %t.pcm -v 2>&1 | FileCheck %s --check-prefix=CHECK-PRECOMPILE
+//
+// CHECK-PRECOMPILE: -cc1 {{.*}} -emit-module-interface
+// CHECK-PRECOMPILE-SAME: -o {{.*}}.pcm
+// CHECK-PRECOMPILE-SAME: -x c++-module
+// CHECK-PRECOMPILE-SAME: modules-ts.cpp
+
+// Check compiling a .pcm file to a .o file.
+//
+// RUN: %clang -fmodules-ts %t.pcm -c -o %t.pcm.o -v 2>&1 | FileCheck %s --check-prefix=CHECK-COMPILE
+//
+// CHECK-COMPILE: -cc1 {{.*}} -emit-obj
+// CHECK-COMPILE-SAME: -o {{.*}}.pcm.o
+// CHECK-COMPILE-SAME: -x pcm
+// CHECK-COMPILE-SAME: {{.*}}.pcm
+
+// Check use of a .pcm file in another compilation.
+//
+// RUN: %clang -fmodules-ts -fmodule-file=%t.pcm %s -c -o %t.o -v 2>&1 | FileCheck %s --check-prefix=CHECK-USE
+//
+// CHECK-USE: -cc1
+// CHECK-USE-SAME: -emit-obj
+// CHECK-USE-SAME: -fmodule-file={{.*}}.pcm
+// CHECK-USE-SAME: -o {{.*}}.o{{"?}} {{.*}}-x c++
+// CHECK-USE-SAME: modules-ts.cpp
+
+// Check combining precompile and compile steps works.
+//
+// RUN: %clang -fmodules-ts -x c++-module %s -Dimplementation= -c -o %t.pcm.o -v 2>&1 | FileCheck %s --check-prefix=CHECK-PRECOMPILE --check-prefix=CHECK-COMPILE
+
+// Check that .cppm is treated as a module implicitly.
+// RUN: cp %s %t.cppm
+// RUN: %clang -fmodules-ts --precompile %t.cppm -Dimplementation= -o %t.pcm -v 2>&1 | FileCheck %s --check-prefix=CHECK-PRECOMPILE
+
+// Note, we use -Dimplementation= to make this a valid module interface unit when building the interface.
+module implementation foo;