Qt 5.6.2 build failure with GCC 7.0.0

In file included from mimetypes/qmimedatabase.cpp:42:0:
mimetypes/qmimeprovider_p.h:59:7: note: forward declaration of 'class QMimeMagicRuleMatcher'
 class QMimeMagicRuleMatcher;
       ^~~~~~~~~~~~~~~~~~~~~
In file included from ../../include/QtCore/qlist.h:1:0,
                 from ../../include/QtCore/../../src/corelib/kernel/qobject.h:43,
                 from ../../include/QtCore/qobject.h:1,
                 from ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:40,
                 from ../../include/QtCore/qcoreapplication.h:1,
                 from global/qt_pch.h:56:
../../include/QtCore/../../src/corelib/tools/qlist.h:484:31: note: neither the destructor nor the class-specific operator delete will be called, even if they are declared when the class is defined
         while(from != to) --to, delete reinterpret_cast<T*>(to->v);
../../include/QtCore/../../src/corelib/tools/qlist.h:486:61: error: invalid use of incomplete type 'class QMimeMagicRuleMatcher'
         while (from != to) --to, reinterpret_cast<T*>(to)->~T();
                                  ~~~~~~~~~~~~~~~~~~~~~~~~~~~^
In file included from mimetypes/qmimedatabase.cpp:42:0:
mimetypes/qmimeprovider_p.h:59:7: note: forward declaration of 'class QMimeMagicRuleMatcher'
 class QMimeMagicRuleMatcher;
       ^~~~~~~~~~~~~~~~~~~~~
make[2]: *** [Makefile:37833: .obj/qmimedatabase.o] Error 1
make[2]: *** Waiting for unfinished jobs....