Add IMPORTED targets for the GL libraries used by Qt.

There may be multiple libraries specified in the mkspec, such as
EGL and Mali, as used in devices/linux-sh4-stmicro-ST7108-g++, so
create an imported target for each one. Also populate the
Qt5Gui_EGL_LIBS variable with all created imported targets. Similar
variables are created for the used OPENGL implementation.

In the case of using the packaged ANGLE library, we already know the
exact locations of the binaries.

This makes it possible for third parties to use the same GL
implementation as used by the Qt build itself. As these are used only
privately by QtGui, they are also added to the DEPENDENT_LIBRARIES
of that target so that they are found for rpath-link usage.

On some platforms (eg Raspberry Pi), multiple include directories must
be set to include egl.h, as the headers it includes for vcos are a
bit scattered.

Task-number: QTBUG-29132

Change-Id: I1126da3d37cd51c88d3670347c8b6405b285efb5
Reviewed-by: Volker Krause <volker.krause@kdab.com>
Reviewed-by: Stephen Kelly <stephen.kelly@kdab.com>

2 files changed, 62 insertions, 0 deletions

diff --git a/tests/auto/cmake/test_egl_lib/CMakeLists.txt b/tests/auto/cmake/test_egl_lib/CMakeLists.txt
new file mode 100644
index 0000000000..87a598fa99
--- /dev/null
+++ b/tests/auto/cmake/test_egl_lib/CMakeLists.txt
@@ -0,0 +1,14 @@
+
+cmake_minimum_required(VERSION 2.8)
+
+project(test_egl_lib)
+
+find_package(Qt5Gui REQUIRED)
+
+include_directories(${Qt5Gui_INCLUDE_DIRS} ${Qt5Gui_EGL_INCLUDE_DIRS} )
+add_definitions(${Qt5Gui_DEFINITIONS})
+
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${Qt5Gui_EXECUTABLE_COMPILE_FLAGS}")
+
+add_executable(myobject main.cpp )
+target_link_libraries(myobject ${Qt5Gui_LIBRARIES} ${Qt5Gui_EGL_LIBRARIES})
diff --git a/tests/auto/cmake/test_egl_lib/main.cpp b/tests/auto/cmake/test_egl_lib/main.cpp
new file mode 100644
index 0000000000..f3a9dc6cd1
--- /dev/null
+++ b/tests/auto/cmake/test_egl_lib/main.cpp
@@ -0,0 +1,48 @@
+/****************************************************************************
+**
+** Copyright (C) 2013 Klarälvdalens Datakonsult AB, a KDAB Group company, info@kdab.com, author Stephen Kelly <stephen.kelly@kdab.com>
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the test suite 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.
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <EGL/egl.h>
+
+int main(int argc, char **argv)
+{
+    eglGetError();
+    return 0;
+}