Wt

Platform:

Ubuntu 18.04 amd64

gcc 7.5.0

Qt 5.9.5

Wt 4.3.0

It fails to compile with clang 6.0 as well.

Also tried this with qt4. Same error.

@

$ cat compile-4.sh

#!/bin/bash

g -c -pipe -O0 -Wall -W -D_REENTRANT -fPIC -DQT_DEPRECATED_WARNINGS -DQT_NO_DEBUG -DQT_GUI_LIB -DQT_CORE_LIB -I. -I. -isystem /usr/include/qt4 -isystem /usr/include/qt4/QtGui -isystem /usr/include/qt4/QtCore -I. -isystem /usr/include/libdrm -I/usr/share/qt4/mkspecs/linux-g -o foo.o foo.cpp

$ apt-cache show libqt4-dev

Package: libqt4-dev

Architecture: amd64

Version: 4:4.8.7+dfsg-7ubuntu1

@

The compilation error with clang is a little more helpful. Points out some template parameter shadowing, but its in the context of a member function...

@

ppetraki@vanguard:~/Sandbox/krillia/WtDesigner/src$ ./compile-4.sh

In file included from foo.cpp:2:

In file included from /usr/local/include/Wt/WContainerWidget.h:10:

In file included from /usr/local/include/Wt/WInteractWidget.h:10:

In file included from /usr/local/include/Wt/WWebWidget.h:14:

In file included from /usr/local/include/Wt/WWidget.h:14:

In file included from /usr/local/include/Wt/WSignal.h:14:

/usr/local/include/Wt/Signals/signals.hpp:216:18: error: expected ')'

void emit (Args... args) const

^

/usr/local/include/Wt/Signals/signals.hpp:216:13: note: to match this '('

void emit (Args... args) const

^

/usr/local/include/Wt/Signals/signals.hpp:216:14: error: declaration of 'Args' shadows template

parameter

void emit (Args... args) const

^

/usr/local/include/Wt/Signals/signals.hpp:78:19: note: template parameter is declared here

template<class... Args>

^

/usr/local/include/Wt/Signals/signals.hpp:216:14: error: field has incomplete type 'void'

void emit (Args... args) const

^

/usr/local/include/Wt/Signals/signals.hpp:216:27: error: expected ';' at end of declaration list

void emit (Args... args) const

^

In file included from foo.cpp:2:

In file included from /usr/local/include/Wt/WContainerWidget.h:10:

In file included from /usr/local/include/Wt/WInteractWidget.h:10:

In file included from /usr/local/include/Wt/WWebWidget.h:14:

In file included from /usr/local/include/Wt/WWidget.h:14:

/usr/local/include/Wt/WSignal.h:330:14: error: expected ')'

void emit(A... args) const;

^

/usr/local/include/Wt/WSignal.h:330:12: note: to match this '('

void emit(A... args) const;

^

/usr/local/include/Wt/WSignal.h:330:13: error: declaration of 'A' shadows template parameter

void emit(A... args) const;

^

/usr/local/include/Wt/WSignal.h:225:20: note: template parameter is declared here

template <class... A>

^

/usr/local/include/Wt/WSignal.h:330:13: error: field has incomplete type 'void'

void emit(A... args) const;

^

/usr/local/include/Wt/WSignal.h:330:23: error: expected ';' at end of declaration list

void emit(A... args) const;

^

/usr/local/include/Wt/WSignal.h:344:19: error: unknown type name 'A'

void operator()(A... args) const;

^

/usr/local/include/Wt/WSignal.h:344:20: error: type 'int' of function parameter pack does not

contain any unexpanded parameter packs

void operator()(A... args) const;



/usr/local/include/Wt/WSignal.h:355:27: error: invalid use of non-static data member 'A'

typedef Signals::Signal<A...> SignalType;

^

In file included from foo.cpp:2:

In file included from /usr/local/include/Wt/WContainerWidget.h:10:

In file included from /usr/local/include/Wt/WInteractWidget.h:10:

In file included from /usr/local/include/Wt/WWebWidget.h:14:

In file included from /usr/local/include/Wt/WWidget.h:14:

In file included from /usr/local/include/Wt/WSignal.h:14:

/usr/local/include/Wt/Signals/signals.hpp:315:33: error: 'CbFunction' is a protected member of

'Wt::Signals::Impl::ProtoSignal<>'

typedef typename ProtoSignal::CbFunction CbFunction;

^

/usr/local/include/Wt/WSignal.h:502:21: note: in instantiation of template class

'Wt::Signals::Signal<>' requested here

Signals::Signal<> dummy_;

^

/usr/local/include/Wt/Signals/signals.hpp:82:41: note: declared protected here

typedef std::function<void (Args...)> CbFunction;

^

In file included from foo.cpp:2:

In file included from /usr/local/include/Wt/WContainerWidget.h:10:

In file included from /usr/local/include/Wt/WInteractWidget.h:10:

In file included from /usr/local/include/Wt/WWebWidget.h:14:

In file included from /usr/local/include/Wt/WWidget.h:14:

/usr/local/include/Wt/WSignal.h:658:15: error: expected ')'

void emit(E e = NoClass()) const;

^

/usr/local/include/Wt/WSignal.h:658:12: note: to match this '('

void emit(E e = NoClass()) const;

^

/usr/local/include/Wt/WSignal.h:658:13: error: declaration of 'E' shadows template parameter

void emit(E e = NoClass()) const;

^

/usr/local/include/Wt/WSignal.h:553:19: note: template parameter is declared here

template

^

/usr/local/include/Wt/WSignal.h:658:13: error: field has incomplete type 'void'

void emit(E e = NoClass()) const;

^

/usr/local/include/Wt/WSignal.h:658:29: error: expected ';' at end of declaration list

void emit(E e = NoClass()) const;

^

/usr/local/include/Wt/WSignal.h:666:19: error: unknown type name 'E'

void operator()(E e) const;

^

/usr/local/include/Wt/WSignal.h:680:27: error: invalid use of non-static data member 'E'

typedef Signals::Signal SignalType;

^

/usr/local/include/Wt/WSignal.h:730:15: error: member reference base type 'Wt::Signal::SignalType'

(aka 'int') is not a structure or union

return impl_.connect(std::bind(method, target), target);



fatal error: too many errors emitted, stopping now [-ferror-limit=]

20 errors generated.

@

I guess that's a caveat, but not really something we can fix. I believe this is because Qt has a define for emit. I think you'll have to undefine emit, or put the Qt header last.

Yup, that did it. I don't know anything about Qt either, heck of learning curve. Thank you so much for your help.