RunCMake/CXXModules: add tests which export BMIs

25 files changed, 479 insertions, 0 deletions

diff --git a/Tests/RunCMake/CXXModules/RunCMakeTest.cmake b/Tests/RunCMake/CXXModules/RunCMakeTest.cmake
index 3d841de..32dd5f0 100644
--- a/Tests/RunCMake/CXXModules/RunCMakeTest.cmake
+++ b/Tests/RunCMake/CXXModules/RunCMakeTest.cmake
@@ -147,6 +147,12 @@ if ("internal_partitions" IN_LIST CMake_TEST_MODULE_COMPILATION)
   run_cxx_module_test(internal-partitions)
 endif ()
 
+# Tests which install BMIs
+if ("export_bmi" IN_LIST CMake_TEST_MODULE_COMPILATION)
+  run_cxx_module_test(export-interface-build)
+  run_cxx_module_test(export-bmi-and-interface-build)
+endif ()
+
 # All of the following tests perform installation.
 set(RunCMake_CXXModules_INSTALL 1)
 
@@ -154,4 +160,9 @@ set(RunCMake_CXXModules_INSTALL 1)
 if ("install_bmi" IN_LIST CMake_TEST_MODULE_COMPILATION)
   run_cxx_module_test(install-bmi)
   run_cxx_module_test(install-bmi-and-interfaces)
+
+  if ("export_bmi" IN_LIST CMake_TEST_MODULE_COMPILATION)
+    run_cxx_module_test(export-interface-install)
+    run_cxx_module_test(export-bmi-and-interface-install)
+  endif ()
 endif ()
diff --git a/Tests/RunCMake/CXXModules/examples/export-bmi-and-interface-build-stderr.txt b/Tests/RunCMake/CXXModules/examples/export-bmi-and-interface-build-stderr.txt
new file mode 100644
index 0000000..5e4392a
--- /dev/null
+++ b/Tests/RunCMake/CXXModules/examples/export-bmi-and-interface-build-stderr.txt
@@ -0,0 +1,9 @@
+CMake Warning \(dev\) at CMakeLists.txt:7 \(target_sources\):
+  CMake's C\+\+ module support is experimental.  It is meant only for
+  experimentation and feedback to CMake developers.
+This warning is for project developers.  Use -Wno-dev to suppress it.
+
+CMake Warning \(dev\):
+  C\+\+20 modules support via CMAKE_EXPERIMENTAL_CXX_MODULE_DYNDEP is
+  experimental.  It is meant only for compiler developers to try.
+This warning is for project developers.  Use -Wno-dev to suppress it.
diff --git a/Tests/RunCMake/CXXModules/examples/export-bmi-and-interface-build/CMakeLists.txt b/Tests/RunCMake/CXXModules/examples/export-bmi-and-interface-build/CMakeLists.txt
new file mode 100644
index 0000000..a450b7e
--- /dev/null
+++ b/Tests/RunCMake/CXXModules/examples/export-bmi-and-interface-build/CMakeLists.txt
@@ -0,0 +1,56 @@
+cmake_minimum_required(VERSION 3.24)
+project(cxx_modules_export_bmi_and_interfaces CXX)
+
+include("${CMAKE_SOURCE_DIR}/../cxx-modules-rules.cmake")
+
+add_library(export_bmi_and_interfaces STATIC)
+target_sources(export_bmi_and_interfaces
+  PRIVATE
+    forward.cxx
+  PRIVATE
+    FILE_SET modules_private TYPE CXX_MODULES
+      BASE_DIRS
+        "${CMAKE_CURRENT_SOURCE_DIR}"
+      FILES
+        private.cxx
+  PUBLIC
+    FILE_SET modules TYPE CXX_MODULES
+      BASE_DIRS
+        "${CMAKE_CURRENT_SOURCE_DIR}"
+      FILES
+        importable.cxx)
+target_compile_features(export_bmi_and_interfaces PUBLIC cxx_std_20)
+
+install(TARGETS export_bmi_and_interfaces
+  EXPORT CXXModules
+  FILE_SET modules DESTINATION "lib/cxx/miu"
+  CXX_MODULES_BMI DESTINATION "lib/cxx/bmi")
+export(EXPORT CXXModules
+  NAMESPACE CXXModules::
+  FILE "${CMAKE_CURRENT_BINARY_DIR}/export_bmi_and_interfaces-targets.cmake"
+  CXX_MODULES_DIRECTORY "export_bmi_and_interfaces-cxx-modules")
+file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/export_bmi_and_interfaces-config.cmake"
+  "include(\"\${CMAKE_CURRENT_LIST_DIR}/export_bmi_and_interfaces-targets.cmake\")
+set(\${CMAKE_FIND_PACKAGE_NAME}_FOUND 1)
+")
+
+set(generator
+  -G "${CMAKE_GENERATOR}")
+if (CMAKE_GENERATOR_TOOLSET)
+  list(APPEND generator
+    -T "${CMAKE_GENERATOR_TOOLSET}")
+endif ()
+if (CMAKE_GENERATOR_PLATFORM)
+  list(APPEND generator
+    -A "${CMAKE_GENERATOR_PLATFORM}")
+endif ()
+
+add_test(NAME export_bmi_and_interfaces_build
+  COMMAND
+    "${CMAKE_COMMAND}"
+    "-Dexpected_source_dir=${CMAKE_CURRENT_SOURCE_DIR}"
+    "-Dexpected_binary_dir=${CMAKE_CURRENT_BINARY_DIR}"
+    "-Dexport_bmi_and_interfaces_DIR=${CMAKE_CURRENT_BINARY_DIR}"
+    ${generator}
+    -S "${CMAKE_CURRENT_SOURCE_DIR}/test"
+    -B "${CMAKE_CURRENT_BINARY_DIR}/test")
diff --git a/Tests/RunCMake/CXXModules/examples/export-bmi-and-interface-build/forward.cxx b/Tests/RunCMake/CXXModules/examples/export-bmi-and-interface-build/forward.cxx
new file mode 100644
index 0000000..7f53271
--- /dev/null
+++ b/Tests/RunCMake/CXXModules/examples/export-bmi-and-interface-build/forward.cxx
@@ -0,0 +1,6 @@
+import priv;
+
+int forwarding()
+{
+  return from_private();
+}
diff --git a/Tests/RunCMake/CXXModules/examples/export-bmi-and-interface-build/importable.cxx b/Tests/RunCMake/CXXModules/examples/export-bmi-and-interface-build/importable.cxx
new file mode 100644
index 0000000..e0b1872
--- /dev/null
+++ b/Tests/RunCMake/CXXModules/examples/export-bmi-and-interface-build/importable.cxx
@@ -0,0 +1,8 @@
+export module importable;
+
+int forwarding();
+
+export int from_import()
+{
+  return forwarding();
+}
diff --git a/Tests/RunCMake/CXXModules/examples/export-bmi-and-interface-build/private.cxx b/Tests/RunCMake/CXXModules/examples/export-bmi-and-interface-build/private.cxx
new file mode 100644
index 0000000..c5b719a
--- /dev/null
+++ b/Tests/RunCMake/CXXModules/examples/export-bmi-and-interface-build/private.cxx
@@ -0,0 +1,6 @@
+export module priv;
+
+export int from_private()
+{
+  return 0;
+}
diff --git a/Tests/RunCMake/CXXModules/examples/export-bmi-and-interface-build/test/CMakeLists.txt b/Tests/RunCMake/CXXModules/examples/export-bmi-and-interface-build/test/CMakeLists.txt
new file mode 100644
index 0000000..b814b3b
--- /dev/null
+++ b/Tests/RunCMake/CXXModules/examples/export-bmi-and-interface-build/test/CMakeLists.txt
@@ -0,0 +1,32 @@
+cmake_minimum_required(VERSION 3.24)
+project(cxx_modules_library NONE)
+
+set(CMAKE_EXPERIMENTAL_CXX_MODULE_CMAKE_API "3c375311-a3c9-4396-a187-3227ef642046")
+
+find_package(export_bmi_and_interfaces REQUIRED)
+
+if (NOT TARGET CXXModules::export_bmi_and_interfaces)
+  message(FATAL_ERROR
+    "Missing imported target")
+endif ()
+
+get_property(file_sets TARGET CXXModules::export_bmi_and_interfaces
+  PROPERTY INTERFACE_CXX_MODULE_SETS)
+if (NOT file_sets STREQUAL "modules")
+  message(FATAL_ERROR
+    "Incorrect exported file sets in `CXXModules::export_bmi_and_interfaces`: `${file_sets}`")
+endif ()
+
+get_property(file_set_files TARGET CXXModules::export_bmi_and_interfaces
+  PROPERTY CXX_MODULE_SET_modules)
+if (NOT file_set_files STREQUAL "${expected_source_dir}/importable.cxx")
+  message(FATAL_ERROR
+    "Incorrect exported file set paths in CXXModules::export_bmi_and_interfaces`: `${file_set_files}`")
+endif ()
+
+get_property(imported_modules TARGET CXXModules::export_bmi_and_interfaces
+  PROPERTY IMPORTED_CXX_MODULES_DEBUG)
+if (NOT imported_modules MATCHES "importable=${expected_source_dir}/importable.cxx,${expected_binary_dir}/CMakeFiles/export_bmi_and_interfaces.dir(/Debug)?/importable.(gcm|pcm|ifc)")
+  message(FATAL_ERROR
+    "Incorrect exported modules in CXXModules::export_bmi_and_interfaces`: `${imported_modules}`")
+endif ()
diff --git a/Tests/RunCMake/CXXModules/examples/export-bmi-and-interface-install-stderr.txt b/Tests/RunCMake/CXXModules/examples/export-bmi-and-interface-install-stderr.txt
new file mode 100644
index 0000000..5e4392a
--- /dev/null
+++ b/Tests/RunCMake/CXXModules/examples/export-bmi-and-interface-install-stderr.txt
@@ -0,0 +1,9 @@
+CMake Warning \(dev\) at CMakeLists.txt:7 \(target_sources\):
+  CMake's C\+\+ module support is experimental.  It is meant only for
+  experimentation and feedback to CMake developers.
+This warning is for project developers.  Use -Wno-dev to suppress it.
+
+CMake Warning \(dev\):
+  C\+\+20 modules support via CMAKE_EXPERIMENTAL_CXX_MODULE_DYNDEP is
+  experimental.  It is meant only for compiler developers to try.
+This warning is for project developers.  Use -Wno-dev to suppress it.
diff --git a/Tests/RunCMake/CXXModules/examples/export-bmi-and-interface-install/CMakeLists.txt b/Tests/RunCMake/CXXModules/examples/export-bmi-and-interface-install/CMakeLists.txt
new file mode 100644
index 0000000..a5574fe
--- /dev/null
+++ b/Tests/RunCMake/CXXModules/examples/export-bmi-and-interface-install/CMakeLists.txt
@@ -0,0 +1,59 @@
+cmake_minimum_required(VERSION 3.24)
+project(cxx_modules_export_bmi_and_interfaces CXX)
+
+include("${CMAKE_SOURCE_DIR}/../cxx-modules-rules.cmake")
+
+add_library(export_bmi_and_interfaces STATIC)
+target_sources(export_bmi_and_interfaces
+  PRIVATE
+    forward.cxx
+  PRIVATE
+    FILE_SET modules_private TYPE CXX_MODULES
+      BASE_DIRS
+        "${CMAKE_CURRENT_SOURCE_DIR}"
+      FILES
+        private.cxx
+  PUBLIC
+    FILE_SET modules TYPE CXX_MODULES
+      BASE_DIRS
+        "${CMAKE_CURRENT_SOURCE_DIR}"
+      FILES
+        importable.cxx)
+target_compile_features(export_bmi_and_interfaces PUBLIC cxx_std_20)
+
+install(TARGETS export_bmi_and_interfaces
+  EXPORT CXXModules
+  FILE_SET modules DESTINATION "lib/cxx/miu"
+  CXX_MODULES_BMI DESTINATION "lib/cxx/bmi")
+install(EXPORT CXXModules
+  NAMESPACE CXXModules::
+  DESTINATION "lib/cmake/export_bmi_and_interfaces"
+  FILE "export_bmi_and_interfaces-targets.cmake"
+  CXX_MODULES_DIRECTORY "export_bmi_and_interfaces-cxx-modules")
+file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/export_bmi_and_interfaces-config.cmake"
+  "include(\"\${CMAKE_CURRENT_LIST_DIR}/export_bmi_and_interfaces-targets.cmake\")
+set(\${CMAKE_FIND_PACKAGE_NAME}_FOUND 1)
+")
+install(FILES "${CMAKE_CURRENT_BINARY_DIR}/export_bmi_and_interfaces-config.cmake"
+  DESTINATION "lib/cmake/export_bmi_and_interfaces")
+
+set(generator
+  -G "${CMAKE_GENERATOR}")
+if (CMAKE_GENERATOR_TOOLSET)
+  list(APPEND generator
+    -T "${CMAKE_GENERATOR_TOOLSET}")
+endif ()
+if (CMAKE_GENERATOR_PLATFORM)
+  list(APPEND generator
+    -A "${CMAKE_GENERATOR_PLATFORM}")
+endif ()
+
+add_test(NAME export_bmi_and_interfaces_build
+  COMMAND
+    "${CMAKE_COMMAND}"
+    "-Dexpected_source_dir=${CMAKE_INSTALL_PREFIX}/lib/cxx/miu"
+    "-Dexpected_binary_dir=${CMAKE_INSTALL_PREFIX}/lib/cxx/bmi"
+    "-Dexport_bmi_and_interfaces_DIR=${CMAKE_INSTALL_PREFIX}/lib/cmake/export_bmi_and_interfaces"
+    ${generator}
+    -S "${CMAKE_CURRENT_SOURCE_DIR}/test"
+    -B "${CMAKE_CURRENT_BINARY_DIR}/test")
diff --git a/Tests/RunCMake/CXXModules/examples/export-bmi-and-interface-install/forward.cxx b/Tests/RunCMake/CXXModules/examples/export-bmi-and-interface-install/forward.cxx
new file mode 100644
index 0000000..7f53271
--- /dev/null
+++ b/Tests/RunCMake/CXXModules/examples/export-bmi-and-interface-install/forward.cxx
@@ -0,0 +1,6 @@
+import priv;
+
+int forwarding()
+{
+  return from_private();
+}
diff --git a/Tests/RunCMake/CXXModules/examples/export-bmi-and-interface-install/importable.cxx b/Tests/RunCMake/CXXModules/examples/export-bmi-and-interface-install/importable.cxx
new file mode 100644
index 0000000..e0b1872
--- /dev/null
+++ b/Tests/RunCMake/CXXModules/examples/export-bmi-and-interface-install/importable.cxx
@@ -0,0 +1,8 @@
+export module importable;
+
+int forwarding();
+
+export int from_import()
+{
+  return forwarding();
+}
diff --git a/Tests/RunCMake/CXXModules/examples/export-bmi-and-interface-install/private.cxx b/Tests/RunCMake/CXXModules/examples/export-bmi-and-interface-install/private.cxx
new file mode 100644
index 0000000..c5b719a
--- /dev/null
+++ b/Tests/RunCMake/CXXModules/examples/export-bmi-and-interface-install/private.cxx
@@ -0,0 +1,6 @@
+export module priv;
+
+export int from_private()
+{
+  return 0;
+}
diff --git a/Tests/RunCMake/CXXModules/examples/export-bmi-and-interface-install/test/CMakeLists.txt b/Tests/RunCMake/CXXModules/examples/export-bmi-and-interface-install/test/CMakeLists.txt
new file mode 100644
index 0000000..db0484d
--- /dev/null
+++ b/Tests/RunCMake/CXXModules/examples/export-bmi-and-interface-install/test/CMakeLists.txt
@@ -0,0 +1,32 @@
+cmake_minimum_required(VERSION 3.24)
+project(cxx_modules_library NONE)
+
+set(CMAKE_EXPERIMENTAL_CXX_MODULE_CMAKE_API "3c375311-a3c9-4396-a187-3227ef642046")
+
+find_package(export_bmi_and_interfaces REQUIRED)
+
+if (NOT TARGET CXXModules::export_bmi_and_interfaces)
+  message(FATAL_ERROR
+    "Missing imported target")
+endif ()
+
+get_property(file_sets TARGET CXXModules::export_bmi_and_interfaces
+  PROPERTY INTERFACE_CXX_MODULE_SETS)
+if (NOT file_sets STREQUAL "modules")
+  message(FATAL_ERROR
+    "Incorrect exported file sets in `CXXModules::export_bmi_and_interfaces`: `${file_sets}`")
+endif ()
+
+get_property(file_set_files TARGET CXXModules::export_bmi_and_interfaces
+  PROPERTY CXX_MODULE_SET_modules)
+if (NOT file_set_files STREQUAL "${expected_source_dir}/importable.cxx")
+  message(FATAL_ERROR
+    "Incorrect exported file set paths in CXXModules::export_bmi_and_interfaces`: `${file_set_files}`")
+endif ()
+
+get_property(imported_modules TARGET CXXModules::export_bmi_and_interfaces
+  PROPERTY IMPORTED_CXX_MODULES_DEBUG)
+if (NOT imported_modules MATCHES "importable=${expected_source_dir}/importable.cxx,${expected_binary_dir}/importable.(gcm|pcm|ifc)")
+  message(FATAL_ERROR
+    "Incorrect exported modules in CXXModules::export_bmi_and_interfaces`: `${imported_modules}`")
+endif ()
diff --git a/Tests/RunCMake/CXXModules/examples/export-interface-build-stderr.txt b/Tests/RunCMake/CXXModules/examples/export-interface-build-stderr.txt
new file mode 100644
index 0000000..5e4392a
--- /dev/null
+++ b/Tests/RunCMake/CXXModules/examples/export-interface-build-stderr.txt
@@ -0,0 +1,9 @@
+CMake Warning \(dev\) at CMakeLists.txt:7 \(target_sources\):
+  CMake's C\+\+ module support is experimental.  It is meant only for
+  experimentation and feedback to CMake developers.
+This warning is for project developers.  Use -Wno-dev to suppress it.
+
+CMake Warning \(dev\):
+  C\+\+20 modules support via CMAKE_EXPERIMENTAL_CXX_MODULE_DYNDEP is
+  experimental.  It is meant only for compiler developers to try.
+This warning is for project developers.  Use -Wno-dev to suppress it.
diff --git a/Tests/RunCMake/CXXModules/examples/export-interface-build/CMakeLists.txt b/Tests/RunCMake/CXXModules/examples/export-interface-build/CMakeLists.txt
new file mode 100644
index 0000000..80ddaf8
--- /dev/null
+++ b/Tests/RunCMake/CXXModules/examples/export-interface-build/CMakeLists.txt
@@ -0,0 +1,53 @@
+cmake_minimum_required(VERSION 3.24)
+project(cxx_modules_export_interfaces CXX)
+
+include("${CMAKE_SOURCE_DIR}/../cxx-modules-rules.cmake")
+
+add_library(export_interfaces STATIC)
+target_sources(export_interfaces
+  PRIVATE
+    forward.cxx
+  PRIVATE
+    FILE_SET modules_private TYPE CXX_MODULES
+      BASE_DIRS
+        "${CMAKE_CURRENT_SOURCE_DIR}"
+      FILES
+        private.cxx
+  PUBLIC
+    FILE_SET modules TYPE CXX_MODULES
+      BASE_DIRS
+        "${CMAKE_CURRENT_SOURCE_DIR}"
+      FILES
+        importable.cxx)
+target_compile_features(export_interfaces PUBLIC cxx_std_20)
+
+install(TARGETS export_interfaces
+  EXPORT CXXModules
+  FILE_SET modules DESTINATION "lib/cxx/miu")
+export(EXPORT CXXModules
+  NAMESPACE CXXModules::
+  FILE "${CMAKE_CURRENT_BINARY_DIR}/export_interfaces-targets.cmake")
+file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/export_interfaces-config.cmake"
+  "include(\"\${CMAKE_CURRENT_LIST_DIR}/export_interfaces-targets.cmake\")
+set(\${CMAKE_FIND_PACKAGE_NAME}_FOUND 1)
+")
+
+set(generator
+  -G "${CMAKE_GENERATOR}")
+if (CMAKE_GENERATOR_TOOLSET)
+  list(APPEND generator
+    -T "${CMAKE_GENERATOR_TOOLSET}")
+endif ()
+if (CMAKE_GENERATOR_PLATFORM)
+  list(APPEND generator
+    -A "${CMAKE_GENERATOR_PLATFORM}")
+endif ()
+
+add_test(NAME export_interfaces_build
+  COMMAND
+    "${CMAKE_COMMAND}"
+    "-Dexpected_dir=${CMAKE_CURRENT_SOURCE_DIR}"
+    "-Dexport_interfaces_DIR=${CMAKE_CURRENT_BINARY_DIR}"
+    ${generator}
+    -S "${CMAKE_CURRENT_SOURCE_DIR}/test"
+    -B "${CMAKE_CURRENT_BINARY_DIR}/test")
diff --git a/Tests/RunCMake/CXXModules/examples/export-interface-build/forward.cxx b/Tests/RunCMake/CXXModules/examples/export-interface-build/forward.cxx
new file mode 100644
index 0000000..7f53271
--- /dev/null
+++ b/Tests/RunCMake/CXXModules/examples/export-interface-build/forward.cxx
@@ -0,0 +1,6 @@
+import priv;
+
+int forwarding()
+{
+  return from_private();
+}
diff --git a/Tests/RunCMake/CXXModules/examples/export-interface-build/importable.cxx b/Tests/RunCMake/CXXModules/examples/export-interface-build/importable.cxx
new file mode 100644
index 0000000..e0b1872
--- /dev/null
+++ b/Tests/RunCMake/CXXModules/examples/export-interface-build/importable.cxx
@@ -0,0 +1,8 @@
+export module importable;
+
+int forwarding();
+
+export int from_import()
+{
+  return forwarding();
+}
diff --git a/Tests/RunCMake/CXXModules/examples/export-interface-build/private.cxx b/Tests/RunCMake/CXXModules/examples/export-interface-build/private.cxx
new file mode 100644
index 0000000..c5b719a
--- /dev/null
+++ b/Tests/RunCMake/CXXModules/examples/export-interface-build/private.cxx
@@ -0,0 +1,6 @@
+export module priv;
+
+export int from_private()
+{
+  return 0;
+}
diff --git a/Tests/RunCMake/CXXModules/examples/export-interface-build/test/CMakeLists.txt b/Tests/RunCMake/CXXModules/examples/export-interface-build/test/CMakeLists.txt
new file mode 100644
index 0000000..6145210
--- /dev/null
+++ b/Tests/RunCMake/CXXModules/examples/export-interface-build/test/CMakeLists.txt
@@ -0,0 +1,32 @@
+cmake_minimum_required(VERSION 3.24)
+project(cxx_modules_library NONE)
+
+set(CMAKE_EXPERIMENTAL_CXX_MODULE_CMAKE_API "3c375311-a3c9-4396-a187-3227ef642046")
+
+find_package(export_interfaces REQUIRED)
+
+if (NOT TARGET CXXModules::export_interfaces)
+  message(FATAL_ERROR
+    "Missing imported target")
+endif ()
+
+get_property(file_sets TARGET CXXModules::export_interfaces
+  PROPERTY INTERFACE_CXX_MODULE_SETS)
+if (NOT file_sets STREQUAL "modules")
+  message(FATAL_ERROR
+    "Incorrect exported file sets in `CXXModules::export_interfaces`: `${file_sets}`")
+endif ()
+
+get_property(file_set_files TARGET CXXModules::export_interfaces
+  PROPERTY CXX_MODULE_SET_modules)
+if (NOT file_set_files STREQUAL "${expected_dir}/importable.cxx")
+  message(FATAL_ERROR
+    "Incorrect exported file set paths in CXXModules::export_interfaces`: `${file_set_files}`")
+endif ()
+
+get_property(imported_modules_set TARGET CXXModules::export_interfaces
+  PROPERTY IMPORTED_CXX_MODULES_DEBUG SET)
+if (imported_modules_set)
+  message(FATAL_ERROR
+    "Unexpected C++ modules specified.")
+endif ()
diff --git a/Tests/RunCMake/CXXModules/examples/export-interface-install-stderr.txt b/Tests/RunCMake/CXXModules/examples/export-interface-install-stderr.txt
new file mode 100644
index 0000000..5e4392a
--- /dev/null
+++ b/Tests/RunCMake/CXXModules/examples/export-interface-install-stderr.txt
@@ -0,0 +1,9 @@
+CMake Warning \(dev\) at CMakeLists.txt:7 \(target_sources\):
+  CMake's C\+\+ module support is experimental.  It is meant only for
+  experimentation and feedback to CMake developers.
+This warning is for project developers.  Use -Wno-dev to suppress it.
+
+CMake Warning \(dev\):
+  C\+\+20 modules support via CMAKE_EXPERIMENTAL_CXX_MODULE_DYNDEP is
+  experimental.  It is meant only for compiler developers to try.
+This warning is for project developers.  Use -Wno-dev to suppress it.
diff --git a/Tests/RunCMake/CXXModules/examples/export-interface-install/CMakeLists.txt b/Tests/RunCMake/CXXModules/examples/export-interface-install/CMakeLists.txt
new file mode 100644
index 0000000..1dfb6da
--- /dev/null
+++ b/Tests/RunCMake/CXXModules/examples/export-interface-install/CMakeLists.txt
@@ -0,0 +1,56 @@
+cmake_minimum_required(VERSION 3.24)
+project(cxx_modules_export_interfaces CXX)
+
+include("${CMAKE_SOURCE_DIR}/../cxx-modules-rules.cmake")
+
+add_library(export_interfaces STATIC)
+target_sources(export_interfaces
+  PRIVATE
+    forward.cxx
+  PRIVATE
+    FILE_SET modules_private TYPE CXX_MODULES
+      BASE_DIRS
+        "${CMAKE_CURRENT_SOURCE_DIR}"
+      FILES
+        private.cxx
+  PUBLIC
+    FILE_SET modules TYPE CXX_MODULES
+      BASE_DIRS
+        "${CMAKE_CURRENT_SOURCE_DIR}"
+      FILES
+        importable.cxx)
+target_compile_features(export_interfaces PUBLIC cxx_std_20)
+
+install(TARGETS export_interfaces
+  EXPORT CXXModules
+  FILE_SET modules DESTINATION "lib/cxx/miu")
+install(EXPORT CXXModules
+  NAMESPACE CXXModules::
+  DESTINATION "lib/cmake/export_interfaces"
+  FILE "export_interfaces-targets.cmake")
+file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/export_interfaces-config.cmake"
+  "include(\"\${CMAKE_CURRENT_LIST_DIR}/export_interfaces-targets.cmake\")
+set(\${CMAKE_FIND_PACKAGE_NAME}_FOUND 1)
+")
+install(FILES "${CMAKE_CURRENT_BINARY_DIR}/export_interfaces-config.cmake"
+  DESTINATION "lib/cmake/export_interfaces")
+
+set(generator
+  -G "${CMAKE_GENERATOR}")
+if (CMAKE_GENERATOR_TOOLSET)
+  list(APPEND generator
+    -T "${CMAKE_GENERATOR_TOOLSET}")
+endif ()
+if (CMAKE_GENERATOR_PLATFORM)
+  list(APPEND generator
+    -A "${CMAKE_GENERATOR_PLATFORM}")
+endif ()
+
+add_test(NAME export_interfaces_build
+  COMMAND
+    "${CMAKE_COMMAND}"
+    "-Dexpected_dir=${CMAKE_INSTALL_PREFIX}/lib/cxx/miu"
+    "-Dexport_interfaces_DIR=${CMAKE_INSTALL_PREFIX}/lib/cmake/export_interfaces"
+    ${generator}
+    -S "${CMAKE_CURRENT_SOURCE_DIR}/test"
+    -B "${CMAKE_CURRENT_BINARY_DIR}/test")
diff --git a/Tests/RunCMake/CXXModules/examples/export-interface-install/forward.cxx b/Tests/RunCMake/CXXModules/examples/export-interface-install/forward.cxx
new file mode 100644
index 0000000..7f53271
--- /dev/null
+++ b/Tests/RunCMake/CXXModules/examples/export-interface-install/forward.cxx
@@ -0,0 +1,6 @@
+import priv;
+
+int forwarding()
+{
+  return from_private();
+}
diff --git a/Tests/RunCMake/CXXModules/examples/export-interface-install/importable.cxx b/Tests/RunCMake/CXXModules/examples/export-interface-install/importable.cxx
new file mode 100644
index 0000000..e0b1872
--- /dev/null
+++ b/Tests/RunCMake/CXXModules/examples/export-interface-install/importable.cxx
@@ -0,0 +1,8 @@
+export module importable;
+
+int forwarding();
+
+export int from_import()
+{
+  return forwarding();
+}
diff --git a/Tests/RunCMake/CXXModules/examples/export-interface-install/private.cxx b/Tests/RunCMake/CXXModules/examples/export-interface-install/private.cxx
new file mode 100644
index 0000000..c5b719a
--- /dev/null
+++ b/Tests/RunCMake/CXXModules/examples/export-interface-install/private.cxx
@@ -0,0 +1,6 @@
+export module priv;
+
+export int from_private()
+{
+  return 0;
+}
diff --git a/Tests/RunCMake/CXXModules/examples/export-interface-install/test/CMakeLists.txt b/Tests/RunCMake/CXXModules/examples/export-interface-install/test/CMakeLists.txt
new file mode 100644
index 0000000..6145210
--- /dev/null
+++ b/Tests/RunCMake/CXXModules/examples/export-interface-install/test/CMakeLists.txt
@@ -0,0 +1,32 @@
+cmake_minimum_required(VERSION 3.24)
+project(cxx_modules_library NONE)
+
+set(CMAKE_EXPERIMENTAL_CXX_MODULE_CMAKE_API "3c375311-a3c9-4396-a187-3227ef642046")
+
+find_package(export_interfaces REQUIRED)
+
+if (NOT TARGET CXXModules::export_interfaces)
+  message(FATAL_ERROR
+    "Missing imported target")
+endif ()
+
+get_property(file_sets TARGET CXXModules::export_interfaces
+  PROPERTY INTERFACE_CXX_MODULE_SETS)
+if (NOT file_sets STREQUAL "modules")
+  message(FATAL_ERROR
+    "Incorrect exported file sets in `CXXModules::export_interfaces`: `${file_sets}`")
+endif ()
+
+get_property(file_set_files TARGET CXXModules::export_interfaces
+  PROPERTY CXX_MODULE_SET_modules)
+if (NOT file_set_files STREQUAL "${expected_dir}/importable.cxx")
+  message(FATAL_ERROR
+    "Incorrect exported file set paths in CXXModules::export_interfaces`: `${file_set_files}`")
+endif ()
+
+get_property(imported_modules_set TARGET CXXModules::export_interfaces
+  PROPERTY IMPORTED_CXX_MODULES_DEBUG SET)
+if (imported_modules_set)
+  message(FATAL_ERROR
+    "Unexpected C++ modules specified.")
+endif ()