cmake + qt + vtk: Compilation errors in macOS Mojave - c++

Question

I'm running macOS Mojave (10.14.3).
After the upgrade to Mojave something in my system changed and I no longer can compile code having VTK and Qt.
A (not) working example can be found in the examples given by VTK.
It's worth to mention, that I can compile the other examples not involving qt.
I use homebrew to install everything I need.
Hier are the logs:
cmake ..
-- The C compiler identification is AppleClang 10.0.1.10010046
-- The CXX compiler identification is AppleClang 10.0.1.10010046
-- Check for working C compiler: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/cc
-- Check for working C compiler: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/c++
-- Check for working CXX compiler: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- VTK_VERSION: 8.1.2
-- Configuring done
-- Generating done
-- Build files have been written to: /Users/chraibi/Downloads/VTK_Examples/SideBySideRenderWindowsQt/build
and
make
In file included from /Users/user/Downloads/VTK_Examples/SideBySideRenderWindowsQt/build/SideBySideRenderWindowsQt_autogen/mocs_compilation.cpp:2:
In file included from /Users/user/Downloads/VTK_Examples/SideBySideRenderWindowsQt/build/SideBySideRenderWindowsQt_autogen/EWIEGA46WW/moc_SideBySideRenderWindowsQt.cpp:9:
In file included from /Users/user/Downloads/VTK_Examples/SideBySideRenderWindowsQt/build/SideBySideRenderWindowsQt_autogen/EWIEGA46WW/../../../SideBySideRenderWindowsQt.h:6:
In file included from /usr/local/opt/qt/lib/QtWidgets.framework/Headers/QMainWindow:1:
In file included from /usr/local/opt/qt/lib/QtWidgets.framework/Headers/qmainwindow.h:44:
In file included from /usr/local/opt/qt/lib/QtWidgets.framework/Headers/qwidget.h:52:
/usr/local/opt/qt/lib/QtWidgets.framework/Headers/qsizepolicy.h:51:82: error: invalid token at start of a preprocessor expression
#if !defined(Q_CC_GNU) || defined(Q_CC_INTEL) || defined(Q_CC_CLANG) || Q_CC_GNU >= 408
^
/usr/local/opt/qt/lib/QtWidgets.framework/Headers/qsizepolicy.h:68:1: error: unknown type name 'Q_DECL_CONST_FUNCTION'
Q_DECL_CONST_FUNCTION inline uint qHash(QSizePolicy key, uint seed = 0) Q_DECL_NOTHROW;
^
/usr/local/opt/qt/lib/QtWidgets.framework/Headers/qsizepolicy.h:68:23: error: expected unqualified-id
Q_DECL_CONST_FUNCTION inline uint qHash(QSizePolicy key, uint seed = 0) Q_DECL_NOTHROW;
^
/usr/local/opt/qt/lib/QtWidgets.framework/Headers/qsizepolicy.h:91:5: error: unknown type name 'Q_ENUM'
Q_ENUM(Policy)
^
/usr/local/opt/qt/lib/QtWidgets.framework/Headers/qsizepolicy.h:91:19: error: expected ';' at end of declaration list
Q_ENUM(Policy)
^
/usr/local/opt/qt/lib/QtWidgets.framework/Headers/qsizepolicy.h:110:35: error: use of undeclared identifier 'ControlType'
Q_DECLARE_FLAGS(ControlTypes, ControlType)
^
/usr/local/opt/qt/lib/QtWidgets.framework/Headers/qsizepolicy.h:111:5: error: unknown type name 'Q_FLAG'
Q_FLAG(ControlTypes)
^
/usr/local/opt/qt/lib/QtWidgets.framework/Headers/qsizepolicy.h:111:12: error: duplicate member 'ControlTypes'
Q_FLAG(ControlTypes)
^
/usr/local/opt/qt/lib/QtWidgets.framework/Headers/qsizepolicy.h:110:21: note: previous declaration is here
Q_DECLARE_FLAGS(ControlTypes, ControlType)
^
/usr/local/opt/qt/lib/QtWidgets.framework/Headers/qsizepolicy.h:111:25: error: expected ';' at end of declaration list
Q_FLAG(ControlTypes)
^
/usr/local/opt/qt/lib/QtWidgets.framework/Headers/qsizepolicy.h:132:5: error: unknown type name 'Q_DECL_RELAXED_CONSTEXPR'
Q_DECL_RELAXED_CONSTEXPR void setHorizontalPolicy(Policy d) Q_DECL_NOTHROW { bits.horPolicy = d; }
^
/usr/local/opt/qt/lib/QtWidgets.framework/Headers/qsizepolicy.h:132:30: error: expected member name or ';' after declaration specifiers
Q_DECL_RELAXED_CONSTEXPR void setHorizontalPolicy(Policy d) Q_DECL_NOTHROW { bits.horPolicy = d; }
~~~~~~~~~~~~~~~~~~~~~~~~ ^
/usr/local/opt/qt/lib/QtWidgets.framework/Headers/qsizepolicy.h:136:73: error: expected ';' at end of declaration list
QT_SIZEPOLICY_CONSTEXPR Qt::Orientations expandingDirections() const Q_DECL_NOTHROW {
^
/usr/local/opt/qt/lib/QtWidgets.framework/Headers/qsizepolicy.h:153:58: error: expected ';' at end of declaration list
QT_SIZEPOLICY_CONSTEXPR int horizontalStretch() const Q_DECL_NOTHROW { return static_cast<int>(bits.horStretch); }
^
/usr/local/opt/qt/lib/QtWidgets.framework/Headers/qsizepolicy.h:176:47: error: expected ';' at end of declaration list
QT_SIZEPOLICY_CONSTEXPR QSizePolicy(int i) Q_DECL_NOTHROW : data(i) { }
^
/usr/local/opt/qt/lib/QtWidgets.framework/Headers/qsizepolicy.h:178:50: error: unknown type name 'Bits'
QT_SIZEPOLICY_CONSTEXPR explicit QSizePolicy(Bits b) Q_DECL_NOTHROW : bits(b) { }
^
/usr/local/opt/qt/lib/QtWidgets.framework/Headers/qsizepolicy.h:178:57: error: expected ';' at end of declaration list
QT_SIZEPOLICY_CONSTEXPR explicit QSizePolicy(Bits b) Q_DECL_NOTHROW : bits(b) { }
^
/usr/local/opt/qt/lib/QtWidgets.framework/Headers/qsizepolicy.h:223:9: error: unknown type name 'Bits'
Bits bits;
^
/usr/local/opt/qt/lib/QtWidgets.framework/Headers/qsizepolicy.h:231:33: error: use of undeclared identifier 'Q_RELOCATABLE_TYPE'; did you mean 'Q_MOVABLE_TYPE'?
Q_DECLARE_TYPEINFO(QSizePolicy, Q_RELOCATABLE_TYPE);
^
/usr/local/include/QtCore/qglobal.h:2272:5: note: 'Q_MOVABLE_TYPE' declared here
Q_MOVABLE_TYPE = 0x2,
^
In file included from /Users/user/Downloads/VTK_Examples/SideBySideRenderWindowsQt/build/SideBySideRenderWindowsQt_autogen/mocs_compilation.cpp:2:
In file included from /Users/user/Downloads/VTK_Examples/SideBySideRenderWindowsQt/build/SideBySideRenderWindowsQt_autogen/EWIEGA46WW/moc_SideBySideRenderWindowsQt.cpp:9:
In file included from /Users/user/Downloads/VTK_Examples/SideBySideRenderWindowsQt/build/SideBySideRenderWindowsQt_autogen/EWIEGA46WW/../../../SideBySideRenderWindowsQt.h:6:
In file included from /usr/local/opt/qt/lib/QtWidgets.framework/Headers/QMainWindow:1:
In file included from /usr/local/opt/qt/lib/QtWidgets.framework/Headers/qmainwindow.h:44:
In file included from /usr/local/opt/qt/lib/QtWidgets.framework/Headers/qwidget.h:52:
/usr/local/opt/qt/lib/QtWidgets.framework/Headers/qsizepolicy.h:231:33: error: use of undeclared identifier 'Q_RELOCATABLE_TYPE'; did you mean 'Q_MOVABLE_TYPE'?
Q_DECLARE_TYPEINFO(QSizePolicy, Q_RELOCATABLE_TYPE);
^
/usr/local/include/QtCore/qglobal.h:2272:5: note: 'Q_MOVABLE_TYPE' declared here
Q_MOVABLE_TYPE = 0x2,
^
fatal error: too many errors emitted, stopping now [-ferror-limit=]
20 errors generated.
make[2]: *** [CMakeFiles/SideBySideRenderWindowsQt.dir/SideBySideRenderWindowsQt_autogen/mocs_compilation.cpp.o] Error 1
make[1]: *** [CMakeFiles/SideBySideRenderWindowsQt.dir/all] Error 2
make: *** [all] Error 2
Similar error I get with cmake -DCMAKE_CXX_COMPILER=g++-8, where g++-8 is installed with brew
Maybe I should mention, there is a software using vtk and qt that I can install via brew without any problems. The same software cannot be compiled directly (cmake --> make).
Could be something with my OS is wrong?

Answer 1

Just uninstall the duplicate QT installations on your system, like the older qt4 version. Credits to khrykin