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When the linker defaults to --as-needed, libmozgtk ends up not linked to libxul because libxul doesn't use anything from it. We solve the problem by adding a symbol to mozgtk and have libxul use it. In bug 1377445, we moved XShmQueryExtension to mozglue. While libxul currently doesn't use the symbol (it's a workaround for system libraries), we can move the function back to mozgtk and add a dummy call. Differential Revision: https://phabricator.services.mozilla.com/D113487
21 lines
1.1 KiB
C
21 lines
1.1 KiB
C
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "mozilla/Types.h"
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#include <X11/Xlib.h>
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// Bug 1271100
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// We need to trick system Cairo into not using the XShm extension due to
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// a race condition in it that results in frequent BadAccess errors. Cairo
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// relies upon XShmQueryExtension to initially detect if XShm is available.
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// So we define our own stub that always indicates XShm not being present.
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// mozgtk loads before libXext/libcairo and so this stub will take priority.
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// Our tree usage goes through xcb and remains unaffected by this.
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//
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// This is also used to force libxul to depend on the mozgtk library. If we
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// ever can remove this workaround for system Cairo, we'll need something
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// to replace it for that purpose.
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MOZ_EXPORT Bool XShmQueryExtension(Display* aDisplay) { return False; }
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