From 6c9614cbf4538924367ffd422f69e7ad086543d2 Mon Sep 17 00:00:00 2001
From: Ben Boeckel <ben.boeckel@kitware.com>
Date: Tue, 26 Dec 2023 11:50:33 -0500
Subject: Tests/CXXModules: add a test case for VS generation without flags

Previously, the `ScanSourceForModuleDependencies` flag was not added to
the VS project if "nothing" prompted custom flags.

See: #25519
---
 Tests/RunCMake/CXXModules/RunCMakeTest.cmake       |  1 +
 .../examples/vs-without-flags/CMakeLists.txt       | 22 ++++++++++++++++++++++
 .../CXXModules/examples/vs-without-flags/main.cxx  |  6 ++++++
 .../examples/vs-without-flags/module.cxx           |  6 ++++++
 4 files changed, 35 insertions(+)
 create mode 100644 Tests/RunCMake/CXXModules/examples/vs-without-flags/CMakeLists.txt
 create mode 100644 Tests/RunCMake/CXXModules/examples/vs-without-flags/main.cxx
 create mode 100644 Tests/RunCMake/CXXModules/examples/vs-without-flags/module.cxx

diff --git a/Tests/RunCMake/CXXModules/RunCMakeTest.cmake b/Tests/RunCMake/CXXModules/RunCMakeTest.cmake
index fcfa60a..514e0f3 100644
--- a/Tests/RunCMake/CXXModules/RunCMakeTest.cmake
+++ b/Tests/RunCMake/CXXModules/RunCMakeTest.cmake
@@ -170,6 +170,7 @@ run_cxx_module_test(scan-with-pch)
 # Tests which use named modules.
 if ("named" IN_LIST CMake_TEST_MODULE_COMPILATION)
   run_cxx_module_test(simple)
+  run_cxx_module_test(vs-without-flags)
   run_cxx_module_test(library library-static -DBUILD_SHARED_LIBS=OFF)
   run_cxx_module_test(object-library)
   run_cxx_module_test(generated)
diff --git a/Tests/RunCMake/CXXModules/examples/vs-without-flags/CMakeLists.txt b/Tests/RunCMake/CXXModules/examples/vs-without-flags/CMakeLists.txt
new file mode 100644
index 0000000..0d18a66
--- /dev/null
+++ b/Tests/RunCMake/CXXModules/examples/vs-without-flags/CMakeLists.txt
@@ -0,0 +1,22 @@
+cmake_minimum_required(VERSION 3.28)
+project(cxx_modules_vs_without_flags CXX)
+
+include("${CMAKE_SOURCE_DIR}/../cxx-modules-rules.cmake")
+
+set(CMAKE_CXX_STANDARD 23)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+set(CMAKE_CXX_EXTENSIONS OFF)
+set(CMAKE_CXX_SCAN_FOR_MODULES ON)
+
+add_executable(vs_without_flags)
+target_sources(vs_without_flags
+  PRIVATE
+    main.cxx
+  PRIVATE
+    FILE_SET CXX_MODULES
+      BASE_DIRS
+        "${CMAKE_CURRENT_SOURCE_DIR}"
+      FILES
+        module.cxx)
+
+add_test(NAME vs_without_flags COMMAND vs_without_flags)
diff --git a/Tests/RunCMake/CXXModules/examples/vs-without-flags/main.cxx b/Tests/RunCMake/CXXModules/examples/vs-without-flags/main.cxx
new file mode 100644
index 0000000..239ab00
--- /dev/null
+++ b/Tests/RunCMake/CXXModules/examples/vs-without-flags/main.cxx
@@ -0,0 +1,6 @@
+import mod;
+
+int main(int argc, char* argv[])
+{
+  return f();
+}
diff --git a/Tests/RunCMake/CXXModules/examples/vs-without-flags/module.cxx b/Tests/RunCMake/CXXModules/examples/vs-without-flags/module.cxx
new file mode 100644
index 0000000..27a61a6
--- /dev/null
+++ b/Tests/RunCMake/CXXModules/examples/vs-without-flags/module.cxx
@@ -0,0 +1,6 @@
+export module mod;
+
+export int f()
+{
+  return 0;
+}
-- 
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