Add the compilation of forkfd to QtCore

This also brings in the harness to forkfd that uses QBasicAtomic
instead of the generic GCC atomics.

Change-Id: Id5488bf192db0027bc684956ade0bf6c640c9512
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

src/corelib/io/forkfd_qt.cpp

@@ -0,0 +1,82 @@
+/****************************************************************************
+**
+** Copyright (C) 2014 Intel Corporation
+** Contact: http://www.qt-project.org/legal
+**
+** 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 Digia.  For licensing terms and
+** conditions see http://qt.digia.com/licensing.  For further information
+** use the contact form at http://qt.digia.com/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 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Digia gives you certain additional
+** rights.  These rights are described in the Digia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+// these might be defined via precompiled headers
+#ifndef _POSIX_C_SOURCE
+#  define _POSIX_C_SOURCE 200809L
+#endif
+#if !defined(_XOPEN_SOURCE) && !defined(__QNXNTO__)
+#  define _XOPEN_SOURCE 500
+#endif
+
+#include <QtCore/qatomic.h>
+
+#if defined(QT_NO_DEBUG) && !defined(NDEBUG)
+#  define NDEBUG
+#endif
+
+typedef QT_PREPEND_NAMESPACE(QBasicAtomicInt) ffd_atomic_int;
+#define ffd_atomic_pointer(type)    QT_PREPEND_NAMESPACE(QBasicAtomicPointer<type>)
+
+QT_BEGIN_NAMESPACE
+
+#define FFD_ATOMIC_INIT(val)    Q_BASIC_ATOMIC_INITIALIZER(val)
+
+#define FFD_ATOMIC_RELAXED  Relaxed
+#define FFD_ATOMIC_ACQUIRE  Acquire
+#define FFD_ATOMIC_RELEASE  Release
+#define loadRelaxed         load
+#define storeRelaxed        store
+
+#define FFD_CONCAT(x, y)    x ## y
+
+#define ffd_atomic_load(ptr,order)      (ptr)->FFD_CONCAT(load, order)()
+#define ffd_atomic_store(ptr,val,order) (ptr)->FFD_CONCAT(store, order)(val)
+#define ffd_atomic_exchange(ptr,val,order) (ptr)->FFD_CONCAT(fetchAndStore, order)(val)
+#define ffd_atomic_compare_exchange(ptr,expected,desired,order1,order2) \
+    (ptr)->FFD_CONCAT(testAndSet, order1)(*expected, desired, *expected)
+#define ffd_atomic_add_fetch(ptr,val,order) ((ptr)->FFD_CONCAT(fetchAndAdd, order)(val) + val)
+
+QT_END_NAMESPACE
+
+extern "C" {
+#include "../../3rdparty/forkfd/forkfd.c"
+}

src/corelib/io/io.pri

@@ -137,6 +137,9 @@ win32 {
                 io/qlockfile_unix.cpp \
                 io/qprocess_unix.cpp \
                 io/qfilesystemiterator_unix.cpp \
+                io/forkfd_qt.cpp
+        HEADERS += \
+                ../3rdparty/forkfd/forkfd.h
 
         !nacl:mac: {
             SOURCES += io/qsettings_mac.cpp