Merge branch 'PHP-7.4'

* PHP-7.4:
  Fix #79247: Garbage collecting variant objects segfaults

Author: cmb69

ext/com_dotnet/bug79247.phpt

@@ -0,0 +1,13 @@
+--TEST--
+Bug #79247 (Garbage collecting variant objects segfaults)
+--SKIPIF--
+<?php
+if (!extension_loaded('com_dotnet')) die('skip com_dotnet extension not available');
+?>
+--FILE--
+<?php
+$keep = new variant(null);
+var_dump(gc_collect_cycles());
+?>
+--EXPECT--
+int(0)

ext/com_dotnet/com_handlers.c

@@ -227,6 +227,13 @@ static HashTable *com_properties_get(zend_object *object)
 	return &zend_empty_array;
 }
 
+static HashTable *com_get_gc(zval *object, zval **table, int *n)
+{
+	*table = NULL;
+	*n = 0;
+	return NULL;
+}
+
 static void function_dtor(zval *zv)
 {
 	zend_internal_function *f = (zend_internal_function*)Z_PTR_P(zv);
@@ -552,7 +559,7 @@ zend_object_handlers php_com_object_handlers = {
 	com_object_count,
 	NULL,									/* get_debug_info */
 	NULL,									/* get_closure */
-	zend_std_get_gc,						/* get_gc */
+	com_get_gc,								/* get_gc */
 	NULL,									/* do_operation */
 	com_objects_compare,					/* compare */
 	NULL,									/* get_properties_for */