From fa8c04b421d1d0af93d58c8e04ee0dce13ecb473 Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Wed, 22 May 2024 14:51:02 -0400
Subject: Tests/RunCMake/execute_process: Check STARTUPINFOW reserved members

Verify that `execute_process` launches processes on Windows such that
`GetStartupInfoW` in the child does not populate `STARTUPINFOW` members
reserved for the MSVC C run-time.

Issue: #25996
---
 Tests/RunCMake/CMakeLists.txt                     |  4 ++++
 Tests/RunCMake/execute_process/RunCMakeTest.cmake |  4 ++++
 Tests/RunCMake/execute_process/StartupInfo.cmake  |  1 +
 Tests/RunCMake/testStartupInfo.c                  | 25 +++++++++++++++++++++++
 4 files changed, 34 insertions(+)
 create mode 100644 Tests/RunCMake/execute_process/StartupInfo.cmake
 create mode 100644 Tests/RunCMake/testStartupInfo.c

diff --git a/Tests/RunCMake/CMakeLists.txt b/Tests/RunCMake/CMakeLists.txt
index f10e72d..a9fe571 100644
--- a/Tests/RunCMake/CMakeLists.txt
+++ b/Tests/RunCMake/CMakeLists.txt
@@ -513,6 +513,10 @@ set(execute_process_ARGS
 if(NOT CMake_TEST_EXTERNAL_CMAKE)
   list(APPEND execute_process_ARGS -DTEST_ENCODING_EXE=$<TARGET_FILE:testEncoding>)
 endif()
+if(WIN32)
+  add_executable(testStartupInfo testStartupInfo.c)
+  list(APPEND execute_process_ARGS -DTEST_STARTUPINFO_EXE=$<TARGET_FILE:testStartupInfo>)
+endif()
 add_RunCMake_test(execute_process)
 add_RunCMake_test(export)
 if(CMake_TEST_MSYSTEM_PREFIX)
diff --git a/Tests/RunCMake/execute_process/RunCMakeTest.cmake b/Tests/RunCMake/execute_process/RunCMakeTest.cmake
index a3a3a9a..cd5e41b 100644
--- a/Tests/RunCMake/execute_process/RunCMakeTest.cmake
+++ b/Tests/RunCMake/execute_process/RunCMakeTest.cmake
@@ -53,3 +53,7 @@ if(WIN32 OR CYGWIN)
   set(RunCMake_TEST_NO_CLEAN 1)
   run_cmake_command(WindowsNoExtension-build ${CMAKE_COMMAND} --build . --config Debug --target RunScript)
 endif()
+
+if(TEST_STARTUPINFO_EXE)
+  run_cmake_script(StartupInfo -DTEST_STARTUPINFO_EXE=${TEST_STARTUPINFO_EXE})
+endif()
diff --git a/Tests/RunCMake/execute_process/StartupInfo.cmake b/Tests/RunCMake/execute_process/StartupInfo.cmake
new file mode 100644
index 0000000..54b9ad4
--- /dev/null
+++ b/Tests/RunCMake/execute_process/StartupInfo.cmake
@@ -0,0 +1 @@
+execute_process(COMMAND "${TEST_STARTUPINFO_EXE}" COMMAND_ERROR_IS_FATAL ANY)
diff --git a/Tests/RunCMake/testStartupInfo.c b/Tests/RunCMake/testStartupInfo.c
new file mode 100644
index 0000000..d626fb9
--- /dev/null
+++ b/Tests/RunCMake/testStartupInfo.c
@@ -0,0 +1,25 @@
+#ifndef _CRT_SECURE_NO_WARNINGS
+#  define _CRT_SECURE_NO_WARNINGS
+#endif
+
+#if defined(_MSC_VER) && _MSC_VER >= 1928
+#  pragma warning(disable : 5105) /* macro expansion warning in windows.h */
+#endif
+
+#include <windows.h>
+
+#include <stdio.h>
+#include <string.h>
+
+int main(void)
+{
+  STARTUPINFOW si;
+  memset(&si, 0, sizeof(si));
+  GetStartupInfoW(&si);
+  if (si.cbReserved2 != 0 || si.lpReserved2 != NULL) {
+    fprintf(stderr, "si.cbReserved2: %u\n", si.cbReserved2);
+    fprintf(stderr, "si.lpReserved2: %p\n", si.lpReserved2);
+    return 1;
+  }
+  return 0;
+}
-- 
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