[glib: 2/3] Silence MSVC C4312 in list tests

[Philip Withnall <pwithnall src gnome org>]

commit d60b4010c42e2d41b6b377c8977492bb7d6cdd8c
Author: Charles Barto <chbarto microsoft com>
Date:   Wed Dec 15 17:21:20 2021 -0800

    Silence MSVC C4312 in list tests
    
    This warning warns on widening casts from integer to pointer type,
    because those casts can be problematic for porting to new pointer
    sizes. The code in question didn't do any bad things here so an
    intermediate cast to size_t was added to silence the warning

 glib/tests/list.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)
---
diff --git a/glib/tests/list.c b/glib/tests/list.c
index d34f1b84a..4efd8b625 100644
--- a/glib/tests/list.c
+++ b/glib/tests/list.c
@@ -532,7 +532,9 @@ static void
 test_double_free (void)
 {
   GList *list, *link;
-  GList  intruder = { NULL, (gpointer)0xDEADBEEF, (gpointer)0xDEADBEEF };
+  // Casts to size_t first ensure compilers won't warn about pointer casts that change size
+  // MSVC's C4312 warning with /Wp64
+  GList  intruder = { NULL, (gpointer)(size_t)0xDEADBEEF, (gpointer)(size_t)0xDEADBEEF };
 
   if (g_test_subprocess ())
     {