[glib: 2/9] gparam: Remove unsynchronized write to g_type field

[Philip Withnall <pwithnall src gnome org>]

commit fba7f7e097e787a4689bbcb41b0c5c51e900722e
Author: Tomasz Miąsko <tomasz miasko gmail com>
Date:   Thu Feb 21 00:00:00 2019 +0000

    gparam: Remove unsynchronized write to g_type field
    
    GValue g_type field is used for synchronization with g_once_init_enter,
    and so it should be written to only with g_once_init_leave.
    
    Replace structure copy with memcpy that copies the one remaining field
    of GValue, i.e., data array.

 gobject/gparam.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)
---
diff --git a/gobject/gparam.c b/gobject/gparam.c
index 79ee834d5..6f33f027b 100644
--- a/gobject/gparam.c
+++ b/gobject/gparam.c
@@ -1561,8 +1561,7 @@ g_param_spec_get_default_value (GParamSpec *pspec)
       g_param_value_set_default (pspec, &default_value);
 
       /* store all but the type */
-      default_value.g_type = 0;
-      priv->default_value = default_value;
+      memcpy (priv->default_value.data, default_value.data, sizeof (default_value.data));
 
       g_once_init_leave (&priv->default_value.g_type, pspec->value_type);
     }