moc: add unittest for --ignore-option-clashes

Based on tst_Moc::frameworkSearchPath().

Change-Id: I4f44f98d62acc1a2a92739cceba731dcb5f661b6
Reviewed-by: Olivier Goffart <ogoffart@woboq.com>

tests/auto/tools/moc/interface-from-include.h

@@ -0,0 +1,55 @@
+/****************************************************************************
+**
+** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
+** 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.
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+#ifndef INTERFACE_FROM_INCLUDE_H
+#define INTERFACE_FROM_INCLUDE_H
+
+#include <testinterface.h>
+
+class TestComponent : public QObject, public TestInterface
+{
+    Q_OBJECT
+    Q_INTERFACES(TestInterface)
+public:
+
+    virtual void foobar() { }
+};
+
+#endif

tests/auto/tools/moc/tst_moc.cpp

@@ -523,6 +523,7 @@ private slots:
     void structQObject();
     void namespacedFlags();
     void warnOnMultipleInheritance();
+    void ignoreOptionClashes();
     void forgottenQInterface();
     void os9Newline();
     void winNewline();
@@ -969,6 +970,46 @@ void tst_Moc::warnOnMultipleInheritance()
 #endif
 }
 
+void tst_Moc::ignoreOptionClashes()
+{
+#ifdef MOC_CROSS_COMPILED
+    QSKIP("Not tested when cross-compiled");
+#endif
+#if defined(Q_OS_LINUX) && defined(Q_CC_GNU) && !defined(QT_NO_PROCESS)
+    QProcess proc;
+    QStringList args;
+    const QString header = m_sourceDirectory + QStringLiteral("/interface-from-include.h");
+    const QString includeDir = m_sourceDirectory + "/Test.framework/Headers";
+    // given --ignore-option-clashes, -pthread should be ignored, but the -I path should not be.
+    args << "--ignore-option-clashes" << "-pthread" << "-I" << includeDir << "-fno-builtin" << header;
+    proc.start("moc", args);
+    bool finished = proc.waitForFinished();
+    if (!finished)
+        qWarning("waitForFinished failed. QProcess error: %d", (int)proc.error());
+    QVERIFY(finished);
+    if (proc.exitCode() != 0) {
+        qDebug() << proc.readAllStandardError();
+    }
+    QCOMPARE(proc.exitCode(), 0);
+    QCOMPARE(proc.readAllStandardError(), QByteArray());
+    QByteArray mocOut = proc.readAllStandardOutput();
+
+    // If -pthread wasn't ignored, it was parsed as a prefix of "thread/", which breaks compilation.
+    QStringList gccArgs;
+    gccArgs << "-c" << "-x" << "c++" << "-I" << ".."
+         << "-I" << qtIncludePath << "-I" << includeDir << "-o" << "/dev/null" << "-fPIE" <<  "-";
+    proc.start("gcc", gccArgs);
+    QVERIFY(proc.waitForStarted());
+    proc.write(mocOut);
+    proc.closeWriteChannel();
+
+    QVERIFY(proc.waitForFinished());
+    QCOMPARE(QString::fromLocal8Bit(proc.readAllStandardError()), QString());
+#else
+    QSKIP("Only tested on linux/gcc");
+#endif
+}
+
 void tst_Moc::forgottenQInterface()
 {
 #ifdef MOC_CROSS_COMPILED