Tests/RunCMake/CXXModules: add tests which use modules from imported targets

Tests/RunCMake/CXXModules/RunCMakeTest.cmake

@@ -189,6 +189,18 @@ if ("export_bmi" IN_LIST CMake_TEST_MODULE_COMPILATION)
   run_cxx_module_test(export-interface-build)
   run_cxx_module_test(export-usage-build)
   run_cxx_module_test(export-bmi-and-interface-build)
+
+  if ("collation" IN_LIST CMake_TEST_MODULE_COMPILATION AND
+      "bmionly" IN_LIST CMake_TEST_MODULE_COMPILATION)
+    set(test_suffix export-interface-build)
+    run_cxx_module_test(import-modules "import-modules-${test_suffix}" "-DCMAKE_PREFIX_PATH=${RunCMake_BINARY_DIR}/examples/${test_suffix}-build")
+
+    set(test_suffix export-interface-no-properties-build)
+    run_cxx_module_test(import-modules "import-modules-${test_suffix}" "-DCMAKE_PREFIX_PATH=${RunCMake_BINARY_DIR}/examples/${test_suffix}-build" -DNO_PROPERTIES=1)
+
+    set(test_suffix export-bmi-and-interface-build)
+    run_cxx_module_test(import-modules "import-modules-${test_suffix}" "-DCMAKE_PREFIX_PATH=${RunCMake_BINARY_DIR}/examples/${test_suffix}-build" -DWITH_BMIS=1)
+  endif ()
 endif ()
 
 # All of the following tests perform installation.
@@ -204,5 +216,19 @@ if ("install_bmi" IN_LIST CMake_TEST_MODULE_COMPILATION)
     run_cxx_module_test(export-interface-install)
     run_cxx_module_test(export-usage-install)
     run_cxx_module_test(export-bmi-and-interface-install)
+
+    if ("collation" IN_LIST CMake_TEST_MODULE_COMPILATION AND
+        "bmionly" IN_LIST CMake_TEST_MODULE_COMPILATION)
+      set(RunCMake_CXXModules_INSTALL 0)
+      set(test_suffix export-interface-install)
+      run_cxx_module_test(import-modules "import-modules-${test_suffix}" "-DCMAKE_PREFIX_PATH=${RunCMake_BINARY_DIR}/examples/${test_suffix}-install")
+
+      set(test_suffix export-interface-no-properties-install)
+      run_cxx_module_test(import-modules "import-modules-${test_suffix}" "-DCMAKE_PREFIX_PATH=${RunCMake_BINARY_DIR}/examples/${test_suffix}-install" -DNO_PROPERTIES=1)
+
+      set(test_suffix export-bmi-and-interface-install)
+      run_cxx_module_test(import-modules "import-modules-${test_suffix}" "-DCMAKE_PREFIX_PATH=${RunCMake_BINARY_DIR}/examples/${test_suffix}-install" -DWITH_BMIS=1)
+      set(RunCMake_CXXModules_INSTALL 1)
+    endif ()
   endif ()
 endif ()

Tests/RunCMake/CXXModules/examples/export-usage-build/importable.cxx

@@ -1,6 +1,8 @@
 export module importable;
 
+extern "C++" {
 int forwarding();
+}
 
 export int from_import()
 {

Tests/RunCMake/CXXModules/examples/export-usage-install/importable.cxx

@@ -1,6 +1,8 @@
 export module importable;
 
+extern "C++" {
 int forwarding();
+}
 
 export int from_import()
 {

Tests/RunCMake/CXXModules/examples/import-modules-export-bmi-and-interface-build-stderr.txt

@@ -0,0 +1,7 @@
+CMake Warning \(dev\) at .*/Tests/RunCMake/CXXModules/examples/export-bmi-and-interface-build-build/export_bmi_and_interfaces-targets.cmake:[0-9]* \(target_sources\):
+  CMake's C\+\+ module support is experimental.  It is meant only for
+  experimentation and feedback to CMake developers.
+Call Stack \(most recent call first\):
+  .*/Tests/RunCMake/CXXModules/examples/export-bmi-and-interface-build-build/export_bmi_and_interfaces-config.cmake:1 \(include\)
+  CMakeLists.txt:15 \(find_package\)
+This warning is for project developers.  Use -Wno-dev to suppress it.

Tests/RunCMake/CXXModules/examples/import-modules-export-bmi-and-interface-install-stderr.txt

@@ -0,0 +1,7 @@
+CMake Warning \(dev\) at .*/Tests/RunCMake/CXXModules/examples/export-bmi-and-interface-install-install/lib/cmake/export_bmi_and_interfaces/export_bmi_and_interfaces-targets.cmake:[0-9]* \(target_sources\):
+  CMake's C\+\+ module support is experimental.  It is meant only for
+  experimentation and feedback to CMake developers.
+Call Stack \(most recent call first\):
+  .*/Tests/RunCMake/CXXModules/examples/export-bmi-and-interface-install-install/lib/cmake/export_bmi_and_interfaces/export_bmi_and_interfaces-config.cmake:1 \(include\)
+  CMakeLists.txt:15 \(find_package\)
+This warning is for project developers.  Use -Wno-dev to suppress it.

Tests/RunCMake/CXXModules/examples/import-modules-export-interface-build-stderr.txt

@@ -0,0 +1,7 @@
+CMake Warning \(dev\) at .*/Tests/RunCMake/CXXModules/examples/export-interface-build-build/export_interfaces-targets.cmake:[0-9]* \(target_sources\):
+  CMake's C\+\+ module support is experimental.  It is meant only for
+  experimentation and feedback to CMake developers.
+Call Stack \(most recent call first\):
+  .*/Tests/RunCMake/CXXModules/examples/export-interface-build-build/export_interfaces-config.cmake:1 \(include\)
+  CMakeLists.txt:15 \(find_package\)
+This warning is for project developers.  Use -Wno-dev to suppress it.

Tests/RunCMake/CXXModules/examples/import-modules-export-interface-install-stderr.txt

@@ -0,0 +1,7 @@
+CMake Warning \(dev\) at .*/Tests/RunCMake/CXXModules/examples/export-interface-install-install/lib/cmake/export_interfaces/export_interfaces-targets.cmake:[0-9]* \(target_sources\):
+  CMake's C\+\+ module support is experimental.  It is meant only for
+  experimentation and feedback to CMake developers.
+Call Stack \(most recent call first\):
+  .*/Tests/RunCMake/CXXModules/examples/export-interface-install-install/lib/cmake/export_interfaces/export_interfaces-config.cmake:1 \(include\)
+  CMakeLists.txt:15 \(find_package\)
+This warning is for project developers.  Use -Wno-dev to suppress it.

Tests/RunCMake/CXXModules/examples/import-modules-export-interface-no-properties-build-stderr.txt

@@ -0,0 +1,7 @@
+CMake Warning \(dev\) at .*/Tests/RunCMake/CXXModules/examples/export-interface-no-properties-build-build/export_interfaces_no_properties-targets.cmake:[0-9]* \(target_sources\):
+  CMake's C\+\+ module support is experimental.  It is meant only for
+  experimentation and feedback to CMake developers.
+Call Stack \(most recent call first\):
+  .*/Tests/RunCMake/CXXModules/examples/export-interface-no-properties-build-build/export_interfaces_no_properties-config.cmake:1 \(include\)
+  CMakeLists.txt:15 \(find_package\)
+This warning is for project developers.  Use -Wno-dev to suppress it.

Tests/RunCMake/CXXModules/examples/import-modules-export-interface-no-properties-install-stderr.txt

@@ -0,0 +1,7 @@
+CMake Warning \(dev\) at .*/Tests/RunCMake/CXXModules/examples/export-interface-no-properties-install-install/lib/cmake/export_interfaces_no_properties/export_interfaces_no_properties-targets.cmake:[0-9]* \(target_sources\):
+  CMake's C\+\+ module support is experimental.  It is meant only for
+  experimentation and feedback to CMake developers.
+Call Stack \(most recent call first\):
+  .*/Tests/RunCMake/CXXModules/examples/export-interface-no-properties-install-install/lib/cmake/export_interfaces_no_properties/export_interfaces_no_properties-config.cmake:1 \(include\)
+  CMakeLists.txt:15 \(find_package\)
+This warning is for project developers.  Use -Wno-dev to suppress it.

Tests/RunCMake/CXXModules/examples/import-modules/CMakeLists.txt

@@ -0,0 +1,24 @@
+cmake_minimum_required(VERSION 3.24)
+project(cxx_modules_import_interfaces CXX)
+
+include("${CMAKE_SOURCE_DIR}/../cxx-modules-rules.cmake")
+
+if (NO_PROPERTIES)
+  set(package_name "export_interfaces_no_properties")
+elseif (WITH_BMIS)
+  set(package_name "export_bmi_and_interfaces")
+else ()
+  set(package_name "export_interfaces")
+endif ()
+set(target_name "CXXModules::${package_name}")
+
+find_package("${package_name}" REQUIRED)
+
+add_executable(use_import_interfaces)
+target_sources(use_import_interfaces
+  PRIVATE
+    use.cxx)
+target_compile_features(use_import_interfaces PRIVATE cxx_std_20)
+target_link_libraries(use_import_interfaces PRIVATE "${target_name}")
+
+add_test(NAME use_import_interfaces COMMAND use_import_interfaces)

Tests/RunCMake/CXXModules/examples/import-modules/use.cxx

@@ -0,0 +1,6 @@
+import importable;
+
+int main(int argc, char* argv[])
+{
+  return from_import();
+}