diff options
Diffstat (limited to 'src/corelib/global/qversiontagging.cpp')
| -rw-r--r-- | src/corelib/global/qversiontagging.cpp | 77 |
1 files changed, 34 insertions, 43 deletions
diff --git a/src/corelib/global/qversiontagging.cpp b/src/corelib/global/qversiontagging.cpp index a0d15ae871..a8191869cc 100644 --- a/src/corelib/global/qversiontagging.cpp +++ b/src/corelib/global/qversiontagging.cpp @@ -1,58 +1,43 @@ -/**************************************************************************** -** -** 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 -** 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 https://www.qt.io/terms-conditions. For further -** information use the contact form at https://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 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 -** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3 -** included in the packaging of this file. Please review the following -** information to ensure the GNU General Public License requirements will -** be met: https://www.gnu.org/licenses/gpl-2.0.html and -** https://www.gnu.org/licenses/gpl-3.0.html. -** -** $QT_END_LICENSE$ -** -****************************************************************************/ +// Copyright (C) 2022 Intel Corporation. +// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only #include "qglobal.h" +#include "qversiontagging.h" +extern "C" { #define SYM QT_MANGLE_NAMESPACE(qt_version_tag) -//#define SSYM QT_STRINGIFY(SYM) +#define SSYM QT_STRINGIFY(SYM) + +// With compilers that have the "alias" attribute, the macro creates a global +// variable "qt_version_tag_M_m" (M: major, m: minor) as an alias to either +// qt_version_tag or _qt_version_tag. Everywhere else, we simply create a new +// global variable qt_version_tag_M_m without aliasing to a single variable. +// +// Additionally, on systems using ELF binaries (Linux, FreeBSD, etc.), we +// create ELF versions by way of the .symver assembly directive[1]. +// +// Unfortunately, Clang on Darwin systems says it supports the "alias" +// attribute, but fails when used. That's a Clang bug (as of XCode 12). +// +// [1] https://sourceware.org/binutils/docs/as/Symver.html -#if defined(Q_CC_GNU) && defined(Q_OF_ELF) && !defined(Q_OS_ANDROID) +#if defined(Q_CC_GNU) && defined(Q_OF_ELF) # define make_versioned_symbol2(sym, m, n, separator) \ - Q_CORE_EXPORT extern const char sym ## _ ## m ## _ ## n = 0; \ + Q_CORE_EXPORT extern __attribute__((alias("_" SSYM))) const char sym ## _ ## m ## _ ## n; \ asm(".symver " QT_STRINGIFY(sym) "_" QT_STRINGIFY(m) "_" QT_STRINGIFY(n) ", " \ QT_STRINGIFY(sym) separator "Qt_" QT_STRINGIFY(m) "." QT_STRINGIFY(n)) + +extern const char QT_MANGLE_NAMESPACE(_qt_version_tag) = 0; +#elif __has_attribute(alias) && !defined(Q_OS_DARWIN) +# define make_versioned_symbol2(sym, m, n, separator) \ + Q_CORE_EXPORT extern __attribute__((alias(SSYM))) const char sym ## _ ## m ## _ ## n +extern const char SYM = 0; #else -# define make_versioned_symbol2(sym, m, n, separator) +# define make_versioned_symbol2(sym, m, n, separator) \ + Q_CORE_EXPORT extern const char sym ## _ ## m ## _ ## n = 0; #endif #define make_versioned_symbol(sym, m, n, separator) make_versioned_symbol2(sym, m, n, separator) -extern "C" { #if QT_VERSION_MINOR > 0 make_versioned_symbol(SYM, QT_VERSION_MAJOR, 0, "@"); #endif @@ -108,3 +93,9 @@ make_versioned_symbol(SYM, QT_VERSION_MAJOR, 15, "@"); // the default version: make_versioned_symbol(SYM, QT_VERSION_MAJOR, QT_VERSION_MINOR, "@@"); } + +QT_BEGIN_NAMESPACE + +static_assert(std::is_trivially_destructible_v<QtPrivate::QVersionTag>); + +QT_END_NAMESPACE |