Workaround 'uninitialized memory use' MemorySanitizer warning (test_atomic)

* tests/test_atomic_include.template (test_atomicXX): Ensure old_w is
always initialized before AO_double_storeXX; add comment about MSan
false warning.

diff --git a/tests/test_atomic_include.template b/tests/test_atomic_include.template
index f665aac..a9e1895 100644 (file)
--- a/tests/test_atomic_include.template
+++ b/tests/test_atomic_include.template
@@ -457,9 +457,12 @@ void test_atomicXX(void)
     if (zz == 25) zz = 117;
 # endif
   TA_assert(zz == 117);
-# if defined(AO_HAVE_double_loadXX)
+# if defined(AO_HAVE_double_loadXX) || defined(AO_HAVE_double_storeXX)
+    /* Initialize old_w even for store to workaround MSan warning.      */
     old_w.AO_val1 = 3316;
     old_w.AO_val2 = 2921;
+# endif
+# if defined(AO_HAVE_double_loadXX)
     new_w = AO_double_loadXX(&old_w);
     TA_assert(new_w.AO_val1 == 3316 && new_w.AO_val2 == 2921);
 # elif !defined(AO_HAVE_double_load) \