From 64548fef160f2daf4489caf17bc5cd79fdc802aa Mon Sep 17 00:00:00 2001
From: Ben Boeckel <ben.boeckel@kitware.com>
Date: Mon, 26 Feb 2024 17:38:24 -0500
Subject: Tests/CXXModules: test using targets that import `std`

---
 Tests/RunCMake/CXXModules/RunCMakeTest.cmake       |  6 ++++++
 .../examples/import-std-transitive/CMakeLists.txt  | 25 ++++++++++++++++++++++
 .../examples/import-std-transitive/main.cxx        |  6 ++++++
 3 files changed, 37 insertions(+)
 create mode 100644 Tests/RunCMake/CXXModules/examples/import-std-transitive/CMakeLists.txt
 create mode 100644 Tests/RunCMake/CXXModules/examples/import-std-transitive/main.cxx

diff --git a/Tests/RunCMake/CXXModules/RunCMakeTest.cmake b/Tests/RunCMake/CXXModules/RunCMakeTest.cmake
index 725ff2f..94e380d 100644
--- a/Tests/RunCMake/CXXModules/RunCMakeTest.cmake
+++ b/Tests/RunCMake/CXXModules/RunCMakeTest.cmake
@@ -250,10 +250,16 @@ if ("named" IN_LIST CMake_TEST_MODULE_COMPILATION)
 
     if ("collation" IN_LIST CMake_TEST_MODULE_COMPILATION)
       run_cxx_module_test(import-std-not-in-export-build)
+      run_cxx_module_test(import-std-transitive import-std-transitive-not-in-export-build "-DCMAKE_PREFIX_PATH=${RunCMake_BINARY_DIR}/examples/import-std-not-in-export-build-build")
 
       set(RunCMake_CXXModules_INSTALL 1)
       run_cxx_module_test(import-std-not-in-export-install)
       unset(RunCMake_CXXModules_INSTALL)
+      run_cxx_module_test(import-std-transitive import-std-transitive-not-in-export-install "-DCMAKE_PREFIX_PATH=${RunCMake_BINARY_DIR}/examples/import-std-not-in-export-install-install")
+
+      run_cxx_module_test(import-std-transitive import-std-transitive-export-no-std-build "-DCMAKE_PREFIX_PATH=${RunCMake_BINARY_DIR}/examples/import-std-export-no-std-build-build" -DEXPORT_NO_STD=1)
+      run_cxx_module_test(import-std-transitive import-std-transitive-export-no-std-install "-DCMAKE_PREFIX_PATH=${RunCMake_BINARY_DIR}/examples/import-std-export-no-std-install-install" -DEXPORT_NO_STD=1)
+    endif ()
   endif ()
 endif ()
 
diff --git a/Tests/RunCMake/CXXModules/examples/import-std-transitive/CMakeLists.txt b/Tests/RunCMake/CXXModules/examples/import-std-transitive/CMakeLists.txt
new file mode 100644
index 0000000..526298c
--- /dev/null
+++ b/Tests/RunCMake/CXXModules/examples/import-std-transitive/CMakeLists.txt
@@ -0,0 +1,25 @@
+cmake_minimum_required(VERSION 3.29)
+
+if (EXPORT_NO_STD)
+  # Block making C++ `import std` targets.
+  add_library(__CMAKE::CXX23 IMPORTED INTERFACE)
+endif ()
+
+project(cxx_modules_import_std_transitive CXX)
+
+include("${CMAKE_SOURCE_DIR}/../cxx-modules-rules.cmake")
+
+if (EXPORT_NO_STD)
+  set(package "import_std_export_no_std")
+else ()
+  set(package "import_std_not_in_export")
+endif ()
+find_package("${package}" REQUIRED)
+
+set(CMAKE_CXX_MODULE_STD 0)
+
+add_executable(main
+  main.cxx)
+target_link_libraries(main PRIVATE "CXXModules::${package}")
+
+add_test(NAME main COMMAND main)
diff --git a/Tests/RunCMake/CXXModules/examples/import-std-transitive/main.cxx b/Tests/RunCMake/CXXModules/examples/import-std-transitive/main.cxx
new file mode 100644
index 0000000..a6dd8d8
--- /dev/null
+++ b/Tests/RunCMake/CXXModules/examples/import-std-transitive/main.cxx
@@ -0,0 +1,6 @@
+import uses_std;
+
+int main(int argc, char* argv[])
+{
+  return f();
+}
-- 
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