gcc doesn't like foreach with const-ref containers

[Andreas Pakulat]

Hi,

while compiling kdevelop I got an error on some code in its language
support which compiles fine with gcc 4.2 on linux. (I'm using mingw
suite 5.1.3, i.e. gcc 3.4.5 on win32).

The problem seems to be that findDeclarationsInternal on line 107 in
kdevelop/languages/cpp/duchainbuilder/cppducontext.h has a
const-reference to a QList as parameter. The error (log attached)
indicates that foreach() can't handle such a const-ref list, while doing
the "standard" for( foo::const_iterator it = list.begin()... thing works
fine.

Does anybody know a "better" solution than to use an iterator-loop, or a
reason why this is. Is it maybe a gcc bug?

Andreas

-- 
Be careful!  UGLY strikes 9 out of 10!
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D:\andreas\mingw\bin\g++.exe   -DMAKE_KDEV4CPPDUCHAINBUILDER_LIB   -g -O2 -fno-reorder-blocks -fno-schedule-insns -fno-inline -ID:\andreas\kde4\sources\kdevelop\build\languages\cpp\duchainbuilder -ID:\andreas\kde4\sources\kdevelop\languages\cpp\duchainbuilder -ID:\andreas\kde4\sources\kdevelop -ID:\andreas\kde4\sources\kdevelop\build -ID:\andreas\kde4\sources\kdevelop\languages\cpp -ID:\andreas\kde4\sources\kdevelop\languages\cpp\parser -ID:\andreas\kde4\sources\kdevelop\languages\cpp\expressionparser -ID:\andreas\kde4\sources\qt-copy\include -ID:\andreas\kde4\sources\qt-copy\include\Qt -ID:\andreas\kde4\sources\qt-copy\mkspecs\default -ID:\andreas\kde4\sources\qt-copy\include\QtCore -ID:\andreas\kde4\sources\qt-copy\include\QtGui -ID:\andreas\kde4\sources\qt-copy\include\Qt3Support -ID:\andreas\kde4\sources\qt-copy\include\QtAssistant -ID:\andreas\kde4\sources\qt-copy\include\QtDesigner -ID:\andreas\kde4\sources\qt-copy\include\QtNetwork -ID:\andreas\kde4\sources\qt-copy\include\QtOpenGL -ID:\andreas\kde4\sources\qt-copy\include\QtSql -ID:\andreas\kde4\sources\qt-copy\include\QtXml -ID:\andreas\kde4\sources\qt-copy\include\QtSvg -ID:\andreas\kde4\sources\qt-copy\include\QtScript -ID:\andreas\kde4\sources\qt-copy\include\QtUiTools -ID:\andreas\kde4\sources\qt-copy\include\QtTest -ID:\andreas\kde4\sources\qt-copy\include\QtDBus -ID:\andreas\kde4\install\include -ID:\andreas\kde4\install\include\KDE -ID:\andreas\kde4\install\include\mingw -ID:\andreas\kde4\install\include\threadweaver -ID:\andreas\kde4\install\include\kdevplatform\interfaces -ID:\andreas\kde4\install\include\kdevplatform\editor -ID:\andreas\kde4\install\include\kdevplatform\project -ID:\andreas\kde4\install\include\kdevplatform\project\interfaces -ID:\andreas\kde4\install\include\kdevplatform\language -ID:\andreas\kde4\install\include\kdevplatform\language\interfaces -ID:\andreas\kde4\install\include\kdevplatform\language\backgroundparser -ID:\andreas\kde4\install\include\kdevplatform\language\duchain -ID:\andreas\kde4\install\include\kdevplatform\language\duchain\viewer   -DQT_DLL -DQT_NO_STL -DQT_NO_CAST_TO_ASCII -D_REENTRANT -DKDE_DEPRECATED_WARNINGS -DHAVE_CONFIG_H=1 -o languages/cpp/duchainbuilder/CMakeFiles/kdev4cppduchainbuilder.dir/contextbuilder.obj -c D:\andreas\kde4\sources\kdevelop\languages\cpp\duchainbuilder\contextbuilder.cpp
In file included from D:\andreas\kde4\sources\kdevelop\languages\cpp\duchainbuilder\contextbuilder.h:27,
                 from D:\andreas\kde4\sources\kdevelop\languages\cpp\duchainbuilder\contextbuilder.cpp:21:
D:/andreas/kde4/sources/qt-copy/include/QtCore/../../src/corelib/global/qglobal.h: In instantiation of `QForeachContainer<const QList<KDevelop::QualifiedIdentifier>&>':
D:\andreas\kde4\sources\kdevelop\languages\cpp\duchainbuilder\cppducontext.h:116:   instantiated from here
D:/andreas/kde4/sources/qt-copy/include/QtCore/../../src/corelib/global/qglobal.h:1816: error: forming reference to reference type `const QList<KDevelop::QualifiedIdentifier>&'
D:/andreas/kde4/sources/qt-copy/include/QtCore/../../src/corelib/global/qglobal.h:1819: error: `const QList<KDevelop::QualifiedIdentifier>&' is not a class, struct, or union type
D:/andreas/kde4/sources/qt-copy/include/QtCore/../../src/corelib/global/qglobal.h:1819: error: `const QList<KDevelop::QualifiedIdentifier>&' is not a class, struct, or union type
D:\andreas\kde4\sources\kdevelop\languages\cpp\duchainbuilder\cppducontext.h: In member function `virtual void Cpp::CppDUContext<Base>::findDeclarationsInternal(const QList<KDevelop::QualifiedIdentifier>&, const KTextEditor::Cursor&, const KSharedPtr<KDevelop::AbstractType>&, QList<KDevelop::Declaration*>&, typename BaseContext::SearchFlags) const':
D:\andreas\kde4\sources\kdevelop\languages\cpp\duchainbuilder\cppducontext.h:116: error: 'class QForeachContainer<const QList<KDevelop::QualifiedIdentifier>&>' has no member named 'i'
D:\andreas\kde4\sources\kdevelop\languages\cpp\duchainbuilder\cppducontext.h:116: error: 'class QForeachContainer<const QList<KDevelop::QualifiedIdentifier>&>' has no member named 'e'
D:\andreas\kde4\sources\kdevelop\languages\cpp\duchainbuilder\cppducontext.h:116: error: 'class QForeachContainer<const QList<KDevelop::QualifiedIdentifier>&>' has no member named 'i'
D:\andreas\kde4\sources\kdevelop\languages\cpp\duchainbuilder\cppducontext.h:116: error: 'class QForeachContainer<const QList<KDevelop::QualifiedIdentifier>&>' has no member named 'i'
D:/andreas/kde4/sources/qt-copy/include/QtCore/../../src/corelib/global/qglobal.h: At global scope:
D:/andreas/kde4/sources/qt-copy/include/QtCore/../../src/corelib/global/qglobal.h: In instantiation of `QForeachContainer<const QList<Cpp::ExpressionEvaluationResult>&>':
D:\andreas\kde4\sources\kdevelop\languages\cpp\duchainbuilder\cppducontext.h:334:   instantiated from here
D:/andreas/kde4/sources/qt-copy/include/QtCore/../../src/corelib/global/qglobal.h:1819: error: `const QList<Cpp::ExpressionEvaluationResult>&' is not a class, struct, or union type
D:/andreas/kde4/sources/qt-copy/include/QtCore/../../src/corelib/global/qglobal.h:1819: error: `const QList<Cpp::ExpressionEvaluationResult>&' is not a class, struct, or union type
D:\andreas\kde4\sources\kdevelop\languages\cpp\duchainbuilder\cppducontext.h: In member function `void Cpp::CppDUContext<Base>::setInstantiatedFrom(Cpp::CppDUContext<Base>*, const QList<Cpp::ExpressionEvaluationResult>&)':
D:\andreas\kde4\sources\kdevelop\languages\cpp\duchainbuilder\cppducontext.h:334: error: 'class QForeachContainer<const QList<Cpp::ExpressionEvaluationResult>&>' has no member named 'i'
D:\andreas\kde4\sources\kdevelop\languages\cpp\duchainbuilder\cppducontext.h:334: error: 'class QForeachContainer<const QList<Cpp::ExpressionEvaluationResult>&>' has no member named 'e'
D:\andreas\kde4\sources\kdevelop\languages\cpp\duchainbuilder\cppducontext.h:334: error: 'class QForeachContainer<const QList<Cpp::ExpressionEvaluationResult>&>' has no member named 'i'
D:\andreas\kde4\sources\kdevelop\languages\cpp\duchainbuilder\cppducontext.h:334: error: 'class QForeachContainer<const QList<Cpp::ExpressionEvaluationResult>&>' has no member named 'i'
D:\andreas\kde4\sources\kdevelop\languages\cpp\duchainbuilder\cppducontext.h: In member function `void Cpp::CppDUContext<Base>::findDeclarationsInternal(const QList<KDevelop::QualifiedIdentifier>&, const KTextEditor::Cursor&, const KSharedPtr<KDevelop::AbstractType>&, QList<KDevelop::Declaration*>&, typename BaseContext::SearchFlags) const [with BaseContext = KDevelop::DUContext]':
D:\andreas\kde4\sources\kdevelop\languages\cpp\duchainbuilder\contextbuilder.cpp:794:   instantiated from here
D:\andreas\kde4\sources\kdevelop\languages\cpp\duchainbuilder\cppducontext.h:116: error: no matching function for call to `QForeachContainer<const QList<KDevelop::QualifiedIdentifier>&>::QForeachContainer(const QList<KDevelop::QualifiedIdentifier>&)'
D:/andreas/kde4/sources/qt-copy/include/QtCore/../../src/corelib/global/qglobal.h:1814: note: candidates are: QForeachContainer<const QList<KDevelop::QualifiedIdentifier>&>::QForeachContainer(const QForeachContainer<const QList<KDevelop::QualifiedIdentifier>&>&)
D:\andreas\kde4\sources\kdevelop\languages\cpp\duchainbuilder\cppducontext.h: In member function `void Cpp::CppDUContext<Base>::findDeclarationsInternal(const QList<KDevelop::QualifiedIdentifier>&, const KTextEditor::Cursor&, const KSharedPtr<KDevelop::AbstractType>&, QList<KDevelop::Declaration*>&, typename BaseContext::SearchFlags) const [with BaseContext = KDevelop::TopDUContext]':
D:\andreas\kde4\sources\kdevelop\languages\cpp\duchainbuilder\contextbuilder.cpp:794:   instantiated from here
D:\andreas\kde4\sources\kdevelop\languages\cpp\duchainbuilder\cppducontext.h:116: error: no matching function for call to `QForeachContainer<const QList<KDevelop::QualifiedIdentifier>&>::QForeachContainer(const QList<KDevelop::QualifiedIdentifier>&)'
D:/andreas/kde4/sources/qt-copy/include/QtCore/../../src/corelib/global/qglobal.h:1814: note: candidates are: QForeachContainer<const QList<KDevelop::QualifiedIdentifier>&>::QForeachContainer(const QForeachContainer<const QList<KDevelop::QualifiedIdentifier>&>&)
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