Can't compile Qt 4.8.7
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The problem is:
itemviews.cpp: In member function ‘virtual bool QAccessibleTable2::unselectColumn(int)’: itemviews.cpp:396:105: error: conversion from ‘int’ to ‘QItemSelectionModel::SelectionFlags {aka QFlags<QItemSelectionModel::SelectionFlag>}’ is ambiguous view()->selectionModel()->select(index, QItemSelectionModel::Columns & QItemSelectionModel::Deselect);The problem here is, the code is trying to convert int into a Qt type, which is ambiguous, even if this type inherits int. (IDK).
Try 4.8.6, which is the latest official 4.8 version I am able to find.
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exactly the same error in qt 4.8.6
Is it something with gcc? some flag?In file included from itemviews.cpp:42:0: itemviews.h: In member function ‘virtual QAccessible::Role QAccessibleTable2CornerButton::role(int) const’: itemviews.h:280:19: warning: unused parameter ‘child’ [-Wunused-parameter] Role role(int child) const { Q_ASSERT(child == 0); return QAccessible::Pane; } ^~~~~ itemviews.h: In member function ‘virtual QAccessible::State QAccessibleTable2CornerButton::state(int) const’: itemviews.h:281:21: warning: unused parameter ‘child’ [-Wunused-parameter] State state(int child) const { Q_ASSERT(child == 0); return QAccessible::Normal; } ^~~~~ itemviews.h: In member function ‘virtual QRect QAccessibleTable2CornerButton::rect(int) const’: itemviews.h:282:20: warning: unused parameter ‘child’ [-Wunused-parameter] QRect rect(int child) const { Q_ASSERT(child == 0); return QRect(); } ^~~~~ itemviews.cpp: In member function ‘virtual bool QAccessibleTable2::unselectColumn(int)’: itemviews.cpp:396:105: error: conversion from ‘int’ to ‘QItemSelectionModel::SelectionFlags {aka QFlags<QItemSelectionModel::SelectionFlag>}’ is ambiguous view()->selectionModel()->select(index, QItemSelectionModel::Columns & QItemSelectionModel::Deselect); ^ In file included from ../../../../include/QtCore/qglobal.h:1:0, from ../../../../include/QtCore/../../src/corelib/global/qnamespace.h:45, from ../../../../include/QtCore/qnamespace.h:1, from ../../../../include/QtCore/../../src/corelib/kernel/qobjectdefs.h:45, from ../../../../include/QtCore/qobjectdefs.h:1, from ../../../../include/QtCore/../../src/corelib/kernel/qobject.h:47, from ../../../../include/QtCore/qobject.h:1, from ../../../../include/QtCore/../../src/corelib/kernel/qpointer.h:45, from ../../../../include/QtCore/qpointer.h:1, from itemviews.h:45, from itemviews.cpp:42: ../../../../include/QtCore/../../src/corelib/global/qglobal.h:2321:29: note: candidate: constexpr QFlags<Enum>::QFlags(QFlags<Enum>::Zero) [with Enum = QItemSelectionModel::SelectionFlag; QFlags<Enum>::Zero = void**] <near match> Q_DECL_CONSTEXPR inline QFlags(Zero = 0) : i(0) {} ^~~~~~ ../../../../include/QtCore/../../src/corelib/global/qglobal.h:2321:29: note: conversion of argument 1 would be ill-formed: itemviews.cpp:396:74: error: invalid conversion from ‘int’ to ‘QFlags<QItemSelectionModel::SelectionFlag>::Zero {aka void**}’ [-fpermissive] view()->selectionModel()->select(index, QItemSelectionModel::Columns & QItemSelectionModel::Deselect); ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~ In file included from ../../../../include/QtCore/qglobal.h:1:0, from ../../../../include/QtCore/../../src/corelib/global/qnamespace.h:45, from ../../../../include/QtCore/qnamespace.h:1, from ../../../../include/QtCore/../../src/corelib/kernel/qobjectdefs.h:45, from ../../../../include/QtCore/qobjectdefs.h:1, from ../../../../include/QtCore/../../src/corelib/kernel/qobject.h:47, from ../../../../include/QtCore/qobject.h:1, from ../../../../include/QtCore/../../src/corelib/kernel/qpointer.h:45, from ../../../../include/QtCore/qpointer.h:1, from itemviews.h:45, from itemviews.cpp:42: ../../../../include/QtCore/../../src/corelib/global/qglobal.h:2320:29: note: candidate: constexpr QFlags<Enum>::QFlags(Enum) [with Enum = QItemSelectionModel::SelectionFlag] <near match> Q_DECL_CONSTEXPR inline QFlags(Enum f) : i(f) {} ^~~~~~ ../../../../include/QtCore/../../src/corelib/global/qglobal.h:2320:29: note: conversion of argument 1 would be ill-formed: itemviews.cpp:396:74: error: invalid conversion from ‘int’ to ‘QItemSelectionModel::SelectionFlag’ [-fpermissive] view()->selectionModel()->select(index, QItemSelectionModel::Columns & QItemSelectionModel::Deselect); ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~ In file included from ../../../../include/QtGui/qitemselectionmodel.h:1:0, from ../../../../include/QtGui/../../src/gui/itemviews/qabstractitemview.h:47, from ../../../../include/QtGui/qabstractitemview.h:1, from itemviews.h:47, from itemviews.cpp:42: ../../../../include/QtGui/../../src/gui/itemviews/qitemselectionmodel.h:199:18: note: initializing argument 2 of ‘virtual void QItemSelectionModel::select(const QModelIndex&, QItemSelectionModel::SelectionFlags)’ virtual void select(const QModelIndex &index, QItemSelectionModel::SelectionFlags command); ^~~~~~ itemviews.cpp: In member function ‘virtual QAccessible::State QAccessibleTable2::state(int) const’: itemviews.cpp:415:49: warning: unused parameter ‘child’ [-Wunused-parameter] QAccessible::State QAccessibleTable2::state(int child) const ^~~~~ itemviews.cpp: In member function ‘virtual QString QAccessibleTable2::text(QAccessible::Text, int) const’: itemviews.cpp:467:45: warning: unused parameter ‘child’ [-Wunused-parameter] QString QAccessibleTable2::text(Text t, int child) const ^~~~~ itemviews.cpp: In member function ‘virtual QRect QAccessibleTable2::rect(int) const’: itemviews.cpp:475:35: warning: unused parameter ‘child’ [-Wunused-parameter] QRect QAccessibleTable2::rect(int child) const ^~~~~ itemviews.cpp: In member function ‘virtual QAccessible::Role QAccessibleTable2Cell::role(int) const’: itemviews.cpp:785:51: warning: unused parameter ‘child’ [-Wunused-parameter] QAccessible::Role QAccessibleTable2Cell::role(int child) const ^~~~~ itemviews.cpp: In member function ‘virtual QAccessible::State QAccessibleTable2Cell::state(int) const’: itemviews.cpp:791:53: warning: unused parameter ‘child’ [-Wunused-parameter] QAccessible::State QAccessibleTable2Cell::state(int child) const ^~~~~ itemviews.cpp: In member function ‘virtual QRect QAccessibleTable2Cell::rect(int) const’: itemviews.cpp:837:5: warning: this ‘if’ clause does not guard... [-Wmisleading-indentation] if (!r.isNull()) ^~ itemviews.cpp:839:9: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the ‘if’ r.translate(view->mapToGlobal(QPoint(0, 0))); ^ itemviews.cpp:830:39: warning: unused parameter ‘child’ [-Wunused-parameter] QRect QAccessibleTable2Cell::rect(int child) const ^~~~~ itemviews.cpp: In member function ‘virtual QString QAccessibleTable2Cell::text(QAccessible::Text, int) const’: itemviews.cpp:843:49: warning: unused parameter ‘child’ [-Wunused-parameter] QString QAccessibleTable2Cell::text(Text t, int child) const ^~~~~ itemviews.cpp: In member function ‘virtual void QAccessibleTable2Cell::setText(QAccessible::Text, int, const QString&)’: itemviews.cpp:864:53: warning: unused parameter ‘child’ [-Wunused-parameter] void QAccessibleTable2Cell::setText(Text /*t*/, int child, const QString &text) ^~~~~ itemviews.cpp: In member function ‘virtual QAccessible::Relation QAccessibleTable2Cell::relationTo(int, const QAccessibleInterface*, int) const’: itemviews.cpp:938:61: warning: unused parameter ‘child’ [-Wunused-parameter] QAccessible::Relation QAccessibleTable2Cell::relationTo(int child, const QAccessibleInterface *other, int otherChild) const ^~~~~ itemviews.cpp:938:107: warning: unused parameter ‘otherChild’ [-Wunused-parameter] QAccessible::Relation QAccessibleTable2Cell::relationTo(int child, const QAccessibleInterface *other, int otherChild) const ^~~~~~~~~~ itemviews.cpp: In member function ‘virtual QAccessible::Role QAccessibleTable2HeaderCell::role(int) const’: itemviews.cpp:977:57: warning: unused parameter ‘child’ [-Wunused-parameter] QAccessible::Role QAccessibleTable2HeaderCell::role(int child) const ^~~~~ itemviews.cpp: In member function ‘virtual QAccessible::State QAccessibleTable2HeaderCell::state(int) const’: itemviews.cpp:985:59: warning: unused parameter ‘child’ [-Wunused-parameter] QAccessible::State QAccessibleTable2HeaderCell::state(int child) const ^~~~~ itemviews.cpp: In member function ‘virtual QRect QAccessibleTable2HeaderCell::rect(int) const’: itemviews.cpp:991:45: warning: unused parameter ‘child’ [-Wunused-parameter] QRect QAccessibleTable2HeaderCell::rect(int child) const ^~~~~ itemviews.cpp: In member function ‘virtual QString QAccessibleTable2HeaderCell::text(QAccessible::Text, int) const’: itemviews.cpp:1020:55: warning: unused parameter ‘child’ [-Wunused-parameter] QString QAccessibleTable2HeaderCell::text(Text t, int child) const ^~~~~ -
gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/6/lto-wrapper
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Debian 6.2.1-5' --with-bugurl=file:///usr/share/doc/gcc-6/README.Bugs --enable-languages=c,ada,c++,java,go,d,fortran,objc,obj-c++ --prefix=/usr --program-suffix=-6 --program-prefix=x86_64-linux-gnu- --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --with-default-libstdcxx-abi=new --enable-gnu-unique-object --disable-vtable-verify --enable-libmpx --enable-plugin --enable-default-pie --with-system-zlib --disable-browser-plugin --enable-java-awt=gtk --enable-gtk-cairo --with-java-home=/usr/lib/jvm/java-1.5.0-gcj-6-amd64/jre --enable-java-home --with-jvm-root-dir=/usr/lib/jvm/java-1.5.0-gcj-6-amd64 --with-jvm-jar-dir=/usr/lib/jvm-exports/java-1.5.0-gcj-6-amd64 --with-arch-directory=amd64 --with-ecj-jar=/usr/share/java/eclipse-ecj.jar --enable-objc-gc=auto --enable-multiarch --with-arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32 --enable-multilib --with-tune=generic --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu
Thread model: posix
gcc version 6.2.1 20161124 (Debian 6.2.1-5)Regards
Marek -
This version of GCC doesn't allow the conversion from QFlags to int, so just add a static cast and you'll be good to go.
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Why re-invent the wheel ? There is already everything you need provided by Qt for such version check.
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@SGaist could you please elaborate about the cast? I tried (int) and still get an error of "invalid conversion from ‘int’ to ‘QItemSelectionModel::SelectionFlag’ [-fpermissive]"
If I add -fpermissive to the Makefile's CXXFLAGS, I get an error that the conversion is ambiguous.
Thank you.
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Is this the cast you mean? (QItemSelectionModel::SelectionFlag)
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No, it's static_cast.
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in itemviews.cpp, I edited from:
view()->selectionModel()->select(index, QItemSelectionModel::Columns & QItemSelectionModel::Deselect);to:
view()->selectionModel()->select(index, static_cast<QItemSelectionModel::SelectionFlags>(QItemSelectionModel::Columns & QItemSelectionModel::Deselect));and at least it compile. Using gcc version 7.2.0 (Ubuntu 7.2.0-8ubuntu3)
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@SGaist , @marcelo-banik : Sorry for the late reply to this topic but your cast helped me as well to build Qt 4.8.6 with g++ 7.3.0 so thanks!
The problem I'm experiencing now are hundreds of warnings from within Qt. Especially stuff from the Q_OBJECT macros and meta system. One popular example is that "register" is deprecated.
Is there a way to get rid of warnings from within Qt but keep all the warnings for my own code? CONFIG += warn_off in the .pro file does not do the trick. It hides my own warnings as well.
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@SGaist , @marcelo-banik : Sorry for the late reply to this topic but your cast helped me as well to build Qt 4.8.6 with g++ 7.3.0 so thanks!
The problem I'm experiencing now are hundreds of warnings from within Qt. Especially stuff from the Q_OBJECT macros and meta system. One popular example is that "register" is deprecated.
Is there a way to get rid of warnings from within Qt but keep all the warnings for my own code? CONFIG += warn_off in the .pro file does not do the trick. It hides my own warnings as well.
@FrozenTarzan
Hi
Ifs the normal compiler warning, im not sure you can disable only for Qt code as
its actually inserted into your code so there is no difference with compiler warning.
However, if you code is modern and clean, i assume you could disable some of
the warning like register keyword as such and not hinder the useful ones for your code. -
@mrjj Well, that's how I do it right now : - ) I'm usually programming warning-free but I guess that I have to disable those two for now (with g++ 7 and Qt 4.8.6 for embedded):
-Wno-deprecated-register -Wno-inconsistent-missing-overrideUnfortunately, I like the "override" keyword very much but it is very annoying to find the warnings from my code only and it's usually also quite bad to perform a full "warning check" manually once in a while.
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Ohhh... sorry my newly setup build system utilized clang instead of g++ in QtCreator. Not sure why this is different from all other setups that I have configured in the last time. Maybe it's the preferred one by QtCreator 4.5.
g++ does not warn about the stuff inside Qt... so I'm "fine" ; - )
