Add detection of C++14 and C++1z compiler features

[ChangeLog][General Improvements] Qt's buildsystem now detects whether
the compiler supports C++14 and experimental support for C++1z. If the
compiler supports it, then Qt is automatically compiled using that
support.
\
This does not apply to user applications built using qmake: those are
still built with C++11 support only. To enable support for C++14 in your
application, add to your .pro file: CONFIG += c++14 (similarly for
C++1z).

Change-Id: Ib056b47dde3341ef9a52ffff13ef1f5d01c42596
Reviewed-by: Lars Knoll <lars.knoll@theqtcompany.com>

4 files changed, 86 insertions, 0 deletions

diff --git a/config.tests/common/c++14/c++14.cpp b/config.tests/common/c++14/c++14.cpp
new file mode 100644
index 0000000000..e17e51831d
--- /dev/null
+++ b/config.tests/common/c++14/c++14.cpp
@@ -0,0 +1,40 @@
+/****************************************************************************
+**
+** Copyright (C) 2015 Intel Corporation.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the configuration 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.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#if __cplusplus > 201103L
+// Compiler claims to support C++14, trust it
+#else
+#  error "__cplusplus must be > 201103L (the value of C++11)"
+#endif
+
+int main(int, char **) { return 0; }
diff --git a/config.tests/common/c++14/c++14.pro b/config.tests/common/c++14/c++14.pro
new file mode 100644
index 0000000000..cbd78ba6fe
--- /dev/null
+++ b/config.tests/common/c++14/c++14.pro
@@ -0,0 +1,3 @@
+SOURCES = c++14.cpp
+CONFIG += c++11 c++14 console
+CONFIG -= qt
diff --git a/config.tests/common/c++1z/c++1z.cpp b/config.tests/common/c++1z/c++1z.cpp
new file mode 100644
index 0000000000..2b61cfec49
--- /dev/null
+++ b/config.tests/common/c++1z/c++1z.cpp
@@ -0,0 +1,40 @@
+/****************************************************************************
+**
+** Copyright (C) 2015 Intel Corporation.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the configuration 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.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#if __cplusplus > 201402L
+// Compiler claims to support experimental C++1z, trust it
+#else
+#  error "__cplusplus must be > 201402L (the value for C++14)"
+#endif
+
+int main(int, char **) { return 0; }
diff --git a/config.tests/common/c++1z/c++1z.pro b/config.tests/common/c++1z/c++1z.pro
new file mode 100644
index 0000000000..3a24946276
--- /dev/null
+++ b/config.tests/common/c++1z/c++1z.pro
@@ -0,0 +1,3 @@
+SOURCES = c++1z.cpp
+CONFIG += c++11 c++14 c++1z console
+CONFIG -= qt