1 files changed, 69 insertions, 0 deletions
diff --git a/src/corelib/global/qversiontagging.cpp b/src/corelib/global/qversiontagging.cpp
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+++ b/src/corelib/global/qversiontagging.cpp
@@ -0,0 +1,69 @@
+/****************************************************************************
+**
+** Copyright (C) 2015 Intel Corporation.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the QtCore module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL21$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 or version 3 as published by the Free
+** Software Foundation and appearing in the file LICENSE.LGPLv21 and
+** LICENSE.LGPLv3 included in the packaging of this file. Please review the
+** following information to ensure the GNU Lesser General Public License
+** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** As a special exception, The Qt Company gives you certain additional
+** rights. These rights are described in The Qt Company LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qglobal.h"
+
+#if defined(Q_CC_GNU) && (defined(Q_OS_LINUX) || defined(Q_OS_FREEBSD)) && defined(Q_PROCESSOR_X86) && !defined(QT_STATIC)
+# define SYM QT_MANGLE_NAMESPACE(qt_version_tag)
+# define SSYM QT_STRINGIFY(SYM)
+
+asm(
+// ASM macro that makes one ELF versioned symbol
+".macro     make_versioned_symbol    plainsym versionedsym\n"
+".globl     plainsym\n"
+".type      plainsym, @object\n"
+".size      plainsym, 1\n"
+".symver    plainsym, versionedsym\n"
+"plainsym :\n"
+".endm\n"
+
+// ASM macro that makes one ELF versioned symbol qt_version_tag{sep}Qt_{major}.{minor}
+// that is an alias to qt_version_tag_{major}_{minor}.
+// The {sep} parameter must be @ for all old versions and @@ for the current version.
+".macro      make_one_tag    major minor sep\n"
+"       make_versioned_symbol   " SSYM "_\\major\\()_\\minor, " SSYM "\\sep\\()Qt_\\major\\().\\minor\n"
+".endm\n"
+
+".altmacro\n"
+".bss\n"
+".set qt_version_major, " QT_STRINGIFY(QT_VERSION) " >> 16\n"       // set qt_version_major
+".set qt_version_minor, 0\n"                                        // set qt_version_minor to 0 (it will grow to the current)
+".rept (" QT_STRINGIFY(QT_VERSION) " >> 8) & 0xff\n"                // repeat minor version times (0 to N-1)
+"    make_one_tag    %qt_version_major, %qt_version_minor, @\n"
+"    .set qt_version_minor, (qt_version_minor + 1)\n"
+".endr\n"
+"    make_one_tag    %qt_version_major, %qt_version_minor, @@\n"    // call the macro for the current version
+"    .space  1\n"                                                   // variable is 1 byte, value 0
+);
+
+#endif