1 files changed, 67 insertions, 0 deletions
diff --git a/Tests/RunCMake/CXXModules/RunCMakeTest.cmake b/Tests/RunCMake/CXXModules/RunCMakeTest.cmake
new file mode 100644
index 0000000..00c1a8b
--- /dev/null
+++ b/Tests/RunCMake/CXXModules/RunCMakeTest.cmake
@@ -0,0 +1,67 @@
+include(RunCMake)
+
+# For `if (IN_LIST)`
+cmake_policy(SET CMP0057 NEW)
+
+run_cmake(compiler_introspection)
+include("${RunCMake_BINARY_DIR}/compiler_introspection-build/info.cmake")
+
+# Test negative cases where C++20 modules do not work.
+run_cmake(NoCXX)
+if ("cxx_std_20" IN_LIST CMAKE_CXX_COMPILE_FEATURES)
+  # This test requires that the compiler be told to compile in an older-than-20
+  # standard. If the compiler forces a standard to be used, skip it.
+  if (NOT forced_cxx_standard)
+    run_cmake(NoCXX20)
+  endif ()
+
+  # This test uses C++20, but another prerequisite is missing, so forced
+  # standards don't matter.
+  run_cmake(NoCXX20ModuleFlag)
+endif ()
+
+if (RunCMake_GENERATOR MATCHES "Ninja")
+  execute_process(
+    COMMAND "${CMAKE_MAKE_PROGRAM}" --version
+    RESULT_VARIABLE res
+    OUTPUT_VARIABLE ninja_version
+    ERROR_VARIABLE err
+    OUTPUT_STRIP_TRAILING_WHITESPACE
+    ERROR_STRIP_TRAILING_WHITESPACE)
+
+  if (res)
+    message(WARNING
+      "Failed to determine `ninja` version: ${err}")
+    set(ninja_version "0")
+  endif ()
+endif ()
+
+# Test behavior when the generator does not support C++20 modules.
+if (NOT RunCMake_GENERATOR MATCHES "Ninja" OR
+    ninja_version VERSION_LESS "1.10" OR
+    NOT "cxx_std_20" IN_LIST CMAKE_CXX_COMPILE_FEATURES)
+  if ("cxx_std_20" IN_LIST CMAKE_CXX_COMPILE_FEATURES)
+    run_cmake(NoDyndepSupport)
+  endif ()
+
+  # Bail; the remaining tests require the generator to successfully generate
+  # with C++20 modules in the source list.
+  return ()
+endif ()
+
+set(fileset_types
+  Modules
+  ModuleHeaderUnits)
+set(scopes
+  Interface
+  Private
+  Public)
+foreach (fileset_type IN LISTS fileset_types)
+  foreach (scope IN LISTS scopes)
+    run_cmake("FileSet${fileset_type}${scope}")
+  endforeach ()
+
+  # Test the error message when a non-C++ source file is found in the source
+  # list.
+  run_cmake("NotCXXSource${fileset_type}")
+endforeach ()