| /**************************************************************************** |
| ** |
| ** Copyright (C) 2016 Intel Corporation. |
| ** Contact: https://www.qt.io/licensing/ |
| ** |
| ** This file is part of the QtCore module of the Qt Toolkit. |
| ** |
| ** $QT_BEGIN_LICENSE:LGPL$ |
| ** Commercial License Usage |
| ** Licensees holding valid commercial Qt licenses may use this file in |
| ** accordance with the commercial license agreement provided with the |
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| ** |
| ** GNU Lesser General Public License Usage |
| ** Alternatively, this file may be used under the terms of the GNU Lesser |
| ** General Public License version 3 as published by the Free Software |
| ** Foundation and appearing in the file LICENSE.LGPL3 included in the |
| ** packaging of this file. Please review the following information to |
| ** ensure the GNU Lesser General Public License version 3 requirements |
| ** will be met: https://www.gnu.org/licenses/lgpl-3.0.html. |
| ** |
| ** GNU General Public License Usage |
| ** Alternatively, this file may be used under the terms of the GNU |
| ** General Public License version 2.0 or (at your option) the GNU General |
| ** Public license version 3 or any later version approved by the KDE Free |
| ** Qt Foundation. The licenses are as published by the Free Software |
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| ** |
| ** $QT_END_LICENSE$ |
| ** |
| ****************************************************************************/ |
| |
| // qglobal.h includes this header, so keep it outside of our include guards |
| #include <QtCore/qglobal.h> |
| |
| #if !defined(QVERSIONTAGGING_H) |
| #define QVERSIONTAGGING_H |
| |
| QT_BEGIN_NAMESPACE |
| |
| /* |
| * Ugly hack warning and explanation: |
| * |
| * This file causes all ELF modules, be they libraries or applications, to use the |
| * qt_version_tag symbol that is present in QtCore. Such symbol is versioned, |
| * so the linker will automatically pull the current Qt version and add it to |
| * the ELF header of the library/application. The assembly produces one section |
| * called ".qtversion" containing two 32-bit values. The first is a |
| * relocation to the qt_version_tag symbol (which is what causes the ELF |
| * version to get used). The second value is the current Qt version at the time |
| * of compilation. |
| * |
| * There will only be one copy of the section in the output library or application. |
| */ |
| |
| #if defined(QT_BUILD_CORE_LIB) || defined(QT_BOOTSTRAPPED) || defined(QT_NO_VERSION_TAGGING) || defined(QT_STATIC) |
| // don't make tags in QtCore, bootstrapped systems or if the user asked not to |
| #elif defined(Q_CC_GNU) && !defined(Q_OS_ANDROID) |
| # if defined(Q_PROCESSOR_X86) && (defined(Q_OS_LINUX) || defined(Q_OS_FREEBSD_KERNEL)) |
| # if defined(Q_PROCESSOR_X86_64) && QT_POINTER_SIZE == 8 // x86-64 64-bit |
| # define QT_VERSION_TAG_RELOC(sym) ".quad " QT_STRINGIFY(QT_MANGLE_NAMESPACE(sym)) "@GOT\n" |
| # else // x86 or x86-64 32-bit (x32) |
| # define QT_VERSION_TAG_RELOC(sym) ".long " QT_STRINGIFY(QT_MANGLE_NAMESPACE(sym)) "@GOT\n" |
| # endif |
| # define QT_VERSION_TAG(sym) \ |
| asm ( \ |
| ".section .qtversion, \"aG\", @progbits, " QT_STRINGIFY(QT_MANGLE_NAMESPACE(sym)) ", comdat\n" \ |
| ".align 8\n" \ |
| QT_VERSION_TAG_RELOC(sym) \ |
| ".long " QT_STRINGIFY(QT_VERSION) "\n" \ |
| ".align 8\n" \ |
| ".previous" \ |
| ) |
| # endif |
| #endif |
| |
| #if defined(QT_VERSION_TAG) |
| QT_VERSION_TAG(qt_version_tag); |
| #endif |
| |
| QT_END_NAMESPACE |
| |
| #endif // QVERSIONTAGGING_H |