Compilation error with master, 5.1 and 5.2 branches

Kevin Funk kfunk at kde.org
Sun Oct 15 08:29:30 UTC 2017 

On Saturday, 14 October 2017 23:16:16 CEST Alexander Shaduri wrote:
> Hi,
> 
> I'm trying to compile at least one of the master, 5.1 or 5.2 branches and
> I'm getting the following error.

Thanks for the report. You're probably hitting a compiler bug.

Fixed in 5.2 and master. See commit below. If you find more issues like that, 
please patch other locations similarly and then please post the patch here.

```
commit 6d5bdbba0a04d7180bda1f6bb47acb386575a561
Author: Kevin Funk <kfunk at kde.org>
Date:   Sun Oct 15 10:26:36 2017 +0200

    Work-around possible compiler bug in GCC 4.8.x
    
    New-style QObject::connect fails with QPointer<T>:
      https://bugreports.qt.io/browse/QTBUG-48988

diff --git a/kdevplatform/language/duchain/navigation/
abstractnavigationwidget.cpp b/kdevplatform/language/duchain/navigation/
abstractnavigationwidget.cpp
index 35d82313e0..50f82c1ff2 100644
--- a/kdevplatform/language/duchain/navigation/abstractnavigationwidget.cpp
+++ b/kdevplatform/language/duchain/navigation/abstractnavigationwidget.cpp
@@ -111,7 +111,7 @@ void AbstractNavigationWidget::initBrowser(int height)
   layout->setMargin(0);
   setLayout(layout);
 
-  connect(d->m_browser, &QTextEdit::selectionChanged, this, [this]() {
+  connect(d->m_browser.data(), &QTextEdit::selectionChanged, this, [this]() {
     d->m_browser->copy();
   });
   connect(d->m_browser.data(), &QTextBrowser::anchorClicked, this, [&](const 
QUrl& url) { d->anchorClicked(url); });
```


Thanks,
Kevin

> I think all of the optional dependencies were found.
> 
> OpenSUSE 42.2, Qt 5.9.2, KDE framework 5.38, plasma 5.10.5, gcc 4.8.5.
> 
> Thanks,
> Alexander
> 
> 
> Build log:
> 
> 
> [ 14%] Building CXX object
> kdevplatform/language/CMakeFiles/KDevPlatformLanguage.dir/duchain/navigatio
> n/abstractnavigationwidget.cpp.o
> /0S/0devel/DL-CVS/kdevelop/kdev5.2/kdevelop/kdevplatform/language/duchain/n
> avigation/abstractnavigationwidget.cpp: In member function ‘void
> KDevelop::AbstractNavigationWidget::initBrowser(int)’:
> /0S/0devel/DL-CVS/kdevelop/kdev5.2/kdevelop/kdevplatform/language/duchain/n
> avigation/abstractnavigationwidget.cpp:116:4: error: no matching function
> for call to
> ‘KDevelop::AbstractNavigationWidget::connect(QPointer<QTextBrowser>&, void
> (QTextEdit::*)(), KDevelop::AbstractNavigationWidget* const,
> KDevelop::AbstractNavigationWidget::initBrowser(int)::__lambda1)’ });
>     ^
> /0S/0devel/DL-CVS/kdevelop/kdev5.2/kdevelop/kdevplatform/language/duchain/na
> vigation/abstractnavigationwidget.cpp:116:4: note: candidates are: In file
> included from /usr/include/qt5/QtCore/qsharedpointer_impl.h:64:0, from
> /usr/include/qt5/QtCore/qsharedpointer.h:48, from
> /usr/include/qt5/QtCore/qpointer.h:43,
>                  from /usr/include/qt5/QtCore/QPointer:1,
>                  from
> /0S/0devel/DL-CVS/kdevelop/kdev5.2/kdevelop/kdevplatform/language/duchain/n
> avigation/abstractnavigationwidget.h:23, from
> /0S/0devel/DL-CVS/kdevelop/kdev5.2/kdevelop/kdevplatform/language/duchain/n
> avigation/abstractnavigationwidget.cpp:20:
> /usr/include/qt5/QtCore/qobject.h:213:36: note: static
> QMetaObject::Connection QObject::connect(const QObject*, const char*, const
> QObject*, const char*, Qt::ConnectionType) static QMetaObject::Connection
> connect(const QObject *sender, const char *signal, ^
> /usr/include/qt5/QtCore/qobject.h:213:36: note:   no known conversion for
> argument 2 from ‘void (QTextEdit::*)()’ to ‘const char*’
> /usr/include/qt5/QtCore/qobject.h:216:36: note: static
> QMetaObject::Connection QObject::connect(const QObject*, const
> QMetaMethod&, const QObject*, const QMetaMethod&, Qt::ConnectionType)
> static QMetaObject::Connection connect(const QObject *sender, const
> QMetaMethod &signal, ^
> /usr/include/qt5/QtCore/qobject.h:216:36: note:   no known conversion for
> argument 2 from ‘void (QTextEdit::*)()’ to ‘const QMetaMethod&’
> /usr/include/qt5/QtCore/qobject.h:468:32: note: QMetaObject::Connection
> QObject::connect(const QObject*, const char*, const char*,
> Qt::ConnectionType) const inline QMetaObject::Connection
> QObject::connect(const QObject *asender, const char *asignal, ^
> /usr/include/qt5/QtCore/qobject.h:468:32: note:   no known conversion for
> argument 2 from ‘void (QTextEdit::*)()’ to ‘const char*’
> /usr/include/qt5/QtCore/qobject.h:233:43: note: template<class Func1, class
> Func2> static QMetaObject::Connection QObject::connect(const typename
> QtPrivate::FunctionPointer<Func>::Object*, Func1, const typename
> QtPrivate::FunctionPointer<Func2>::Object*, Func2, Qt::ConnectionType)
> static inline QMetaObject::Connection connect(const typename
> QtPrivate::FunctionPointer<Func1>::Object *sender, Func1 signal, ^
> /usr/include/qt5/QtCore/qobject.h:233:43: note:   template argument
> deduction/substitution failed:
> /0S/0devel/DL-CVS/kdevelop/kdev5.2/kdevelop/kdevplatform/language/duchain/n
> avigation/abstractnavigationwidget.cpp:116:4: note:   mismatched types
> ‘const typename QtPrivate::FunctionPointer<Func>::Object*’ and
> ‘QPointer<QTextBrowser>’ });
>     ^
> In file included from /usr/include/qt5/QtCore/qsharedpointer_impl.h:64:0,
>                  from /usr/include/qt5/QtCore/qsharedpointer.h:48,
>                  from /usr/include/qt5/QtCore/qpointer.h:43,
>                  from /usr/include/qt5/QtCore/QPointer:1,
>                  from
> /0S/0devel/DL-CVS/kdevelop/kdev5.2/kdevelop/kdevplatform/language/duchain/n
> avigation/abstractnavigationwidget.h:23, from
> /0S/0devel/DL-CVS/kdevelop/kdev5.2/kdevelop/kdevplatform/language/duchain/n
> avigation/abstractnavigationwidget.cpp:20:
> /usr/include/qt5/QtCore/qobject.h:265:13: note: template<class Func1, class
> Func2> static typename
> std::enable_if<((int)(QtPrivate::FunctionPointer<Func2>::ArgumentCount) >=
> 0), QMetaObject::Connection>::type QObject::connect(const typename
> QtPrivate::FunctionPointer<Func>::Object*, Func1, Func2) connect(const
> typename QtPrivate::FunctionPointer<Func1>::Object *sender, Func1 signal,
> Func2 slot) ^
> /usr/include/qt5/QtCore/qobject.h:265:13: note:   template argument
> deduction/substitution failed:
> /0S/0devel/DL-CVS/kdevelop/kdev5.2/kdevelop/kdevplatform/language/duchain/n
> avigation/abstractnavigationwidget.cpp:116:4: note:   mismatched types
> ‘const typename QtPrivate::FunctionPointer<Func>::Object*’ and
> ‘QPointer<QTextBrowser>’ });
>     ^
> In file included from /usr/include/qt5/QtCore/qsharedpointer_impl.h:64:0,
>                  from /usr/include/qt5/QtCore/qsharedpointer.h:48,
>                  from /usr/include/qt5/QtCore/qpointer.h:43,
>                  from /usr/include/qt5/QtCore/QPointer:1,
>                  from
> /0S/0devel/DL-CVS/kdevelop/kdev5.2/kdevelop/kdevplatform/language/duchain/n
> avigation/abstractnavigationwidget.h:23, from
> /0S/0devel/DL-CVS/kdevelop/kdev5.2/kdevelop/kdevplatform/language/duchain/n
> avigation/abstractnavigationwidget.cpp:20:
> /usr/include/qt5/QtCore/qobject.h:274:13: note: template<class Func1, class
> Func2> static typename
> std::enable_if<(((int)(QtPrivate::FunctionPointer<Func2>::ArgumentCount) >=
> 0) && (! QtPrivate::FunctionPointer<Func2>::IsPointerToMemberFunction)),
> QMetaObject::Connection>::type QObject::connect(const typename
> QtPrivate::FunctionPointer<Func>::Object*, Func1, const QObject*, Func2,
> Qt::ConnectionType) connect(const typename
> QtPrivate::FunctionPointer<Func1>::Object *sender, Func1 signal, const
> QObject *context, Func2 slot, ^
> /usr/include/qt5/QtCore/qobject.h:274:13: note:   template argument
> deduction/substitution failed:
> /0S/0devel/DL-CVS/kdevelop/kdev5.2/kdevelop/kdevplatform/language/duchain/n
> avigation/abstractnavigationwidget.cpp:116:4: note:   mismatched types
> ‘const typename QtPrivate::FunctionPointer<Func>::Object*’ and
> ‘QPointer<QTextBrowser>’ });
>     ^
> In file included from /usr/include/qt5/QtCore/qsharedpointer_impl.h:64:0,
>                  from /usr/include/qt5/QtCore/qsharedpointer.h:48,
>                  from /usr/include/qt5/QtCore/qpointer.h:43,
>                  from /usr/include/qt5/QtCore/QPointer:1,
>                  from
> /0S/0devel/DL-CVS/kdevelop/kdev5.2/kdevelop/kdevplatform/language/duchain/n
> avigation/abstractnavigationwidget.h:23, from
> /0S/0devel/DL-CVS/kdevelop/kdev5.2/kdevelop/kdevplatform/language/duchain/n
> avigation/abstractnavigationwidget.cpp:20:
> /usr/include/qt5/QtCore/qobject.h:305:13: note: template<class Func1, class
> Func2> static typename
> std::enable_if<(QtPrivate::FunctionPointer<Func2>::ArgumentCount == (-1)),
> QMetaObject::Connection>::type QObject::connect(const typename
> QtPrivate::FunctionPointer<Func>::Object*, Func1, Func2) connect(const
> typename QtPrivate::FunctionPointer<Func1>::Object *sender, Func1 signal,
> Func2 slot) ^
> /usr/include/qt5/QtCore/qobject.h:305:13: note:   template argument
> deduction/substitution failed:
> /0S/0devel/DL-CVS/kdevelop/kdev5.2/kdevelop/kdevplatform/language/duchain/n
> avigation/abstractnavigationwidget.cpp:116:4: note:   mismatched types
> ‘const typename QtPrivate::FunctionPointer<Func>::Object*’ and
> ‘QPointer<QTextBrowser>’ });
>     ^
> In file included from /usr/include/qt5/QtCore/qsharedpointer_impl.h:64:0,
>                  from /usr/include/qt5/QtCore/qsharedpointer.h:48,
>                  from /usr/include/qt5/QtCore/qpointer.h:43,
>                  from /usr/include/qt5/QtCore/QPointer:1,
>                  from
> /0S/0devel/DL-CVS/kdevelop/kdev5.2/kdevelop/kdevplatform/language/duchain/n
> avigation/abstractnavigationwidget.h:23, from
> /0S/0devel/DL-CVS/kdevelop/kdev5.2/kdevelop/kdevplatform/language/duchain/n
> avigation/abstractnavigationwidget.cpp:20:
> /usr/include/qt5/QtCore/qobject.h:313:13: note: template<class Func1, class
> Func2> static typename
> std::enable_if<(QtPrivate::FunctionPointer<Func2>::ArgumentCount == (-1)),
> QMetaObject::Connection>::type QObject::connect(const typename
> QtPrivate::FunctionPointer<Func>::Object*, Func1, const QObject*, Func2,
> Qt::ConnectionType) connect(const typename
> QtPrivate::FunctionPointer<Func1>::Object *sender, Func1 signal, const
> QObject *context, Func2 slot, ^
> /usr/include/qt5/QtCore/qobject.h:313:13: note:   template argument
> deduction/substitution failed:
> /0S/0devel/DL-CVS/kdevelop/kdev5.2/kdevelop/kdevplatform/language/duchain/n
> avigation/abstractnavigationwidget.cpp:116:4: note:   mismatched types
> ‘const typename QtPrivate::FunctionPointer<Func>::Object*’ and
> ‘QPointer<QTextBrowser>’ });
>     ^
> kdevplatform/language/CMakeFiles/KDevPlatformLanguage.dir/build.make:1918:
> recipe for target
> 'kdevplatform/language/CMakeFiles/KDevPlatformLanguage.dir/duchain/navigati
> on/abstractnavigationwidget.cpp.o' failed make[2]: ***
> [kdevplatform/language/CMakeFiles/KDevPlatformLanguage.dir/duchain/navigati
> on/abstractnavigationwidget.cpp.o] Error 1 CMakeFiles/Makefile2:811: recipe
> for target 'kdevplatform/language/CMakeFiles/KDevPlatformLanguage.dir/all'
> failed make[1]: ***
> [kdevplatform/language/CMakeFiles/KDevPlatformLanguage.dir/all] Error 2
> Makefile:127: recipe for target 'all' failed
> make: *** [all] Error 2


-- 
Kevin Funk | kfunk at kde.org | http://kfunk.org
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