Disable some tests on slow architectures which keep failing the tests

[smcv: Modified to use g_test_skip() instead of omitting those test cases
completely, and allow them to be re-enabled with a Debian-specific
environment variable]

Co-authored-by: Simon McVittie <smcv@debian.org>
Forwarded: no

glib/tests/mainloop.c

@@ -520,6 +520,14 @@ test_child_sources (void)
   GMainLoop *loop;
   GSource *parent, *child_b, *child_c, *end;
 
+#if defined(__arm__)
+  if (g_getenv ("DEB_ALLOW_FLAKY_TESTS") == NULL)
+    {
+      g_test_skip ("Not reliable on older ARM hardware");
+      return;
+    }
+#endif
+
   ctx = g_main_context_new ();
   loop = g_main_loop_new (ctx, FALSE);
 
@@ -598,6 +606,14 @@ test_recursive_child_sources (void)
   GMainLoop *loop;
   GSource *parent, *child_b, *child_c, *end;
 
+#if defined(__arm__)
+  if (g_getenv ("DEB_ALLOW_FLAKY_TESTS") == NULL)
+    {
+      g_test_skip ("Not reliable on older ARM hardware");
+      return;
+    }
+#endif
+
   ctx = g_main_context_new ();
   loop = g_main_loop_new (ctx, FALSE);
 

glib/tests/timeout.c

@@ -177,6 +177,15 @@ test_func (gpointer data)
 static void
 test_rounding (void)
 {
+
+#if defined(__arm__)
+  if (g_getenv ("DEB_ALLOW_FLAKY_TESTS") == NULL)
+    {
+      g_test_skip ("Not reliable on older ARM hardware");
+      return;
+    }
+#endif
+
   loop = g_main_loop_new (NULL, FALSE);
 
   last_time = g_get_monotonic_time ();

gobject/tests/threadtests.c

@@ -484,6 +484,14 @@ test_threaded_toggle_notify (void)
                   "safely from another (the main) thread without causing the "
                   "notifying thread to abort");
 
+#if defined(__arm__)
+  if (g_getenv ("DEB_ALLOW_FLAKY_TESTS") == NULL)
+    {
+      g_test_skip ("Intermittently takes more than 5 minutes on 32-bit ARM (Debian#1023652)");
+      return;
+    }
+#endif
+
   g_object_add_toggle_ref (object, on_toggle_notify, &data);
   g_object_unref (object);