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-rw-r--r--widget/gtk/mozgtk/mozgtk.c30
1 files changed, 30 insertions, 0 deletions
diff --git a/widget/gtk/mozgtk/mozgtk.c b/widget/gtk/mozgtk/mozgtk.c
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+++ b/widget/gtk/mozgtk/mozgtk.c
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "mozilla/Types.h"
+
+#include <gdk/gdk.h>
+
+// Dummy call to gtk3 library to prevent the linker from removing
+// the gtk3 dependency with --as-needed.
+// see toolkit/library/moz.build for details.
+MOZ_EXPORT void mozgtk_linker_holder() { gdk_display_get_default(); }
+
+#ifdef MOZ_X11
+# include <X11/Xlib.h>
+// Bug 1271100
+// We need to trick system Cairo into not using the XShm extension due to
+// a race condition in it that results in frequent BadAccess errors. Cairo
+// relies upon XShmQueryExtension to initially detect if XShm is available.
+// So we define our own stub that always indicates XShm not being present.
+// mozgtk loads before libXext/libcairo and so this stub will take priority.
+// Our tree usage goes through xcb and remains unaffected by this.
+//
+// This is also used to force libxul to depend on the mozgtk library. If we
+// ever can remove this workaround for system Cairo, we'll need something
+// to replace it for that purpose.
+MOZ_EXPORT Bool XShmQueryExtension(Display* aDisplay) { return False; }
+#endif