[Bug c++/58678] [4.9 Regression] pykde4-4.11.2 link error (devirtualization too trigger happy)

["trippels at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58678

--- Comment #24 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
Created attachment 32272
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=32272&action=edit
Unreduced testcase

Here's the unreduced testcase:

markus@x4 tmp % g++ -Wall -Wextra -c -O2 test.ii
markus@x4 tmp % nm test.o | c++filt | grep KPart
                 U KParts::Part::setManager(KParts::PartManager*)
                 U KParts::Part::customEvent(QEvent*)
                 U KParts::Part::qt_metacall(QMetaObject::Call, int, void**)
                 U KParts::Part::qt_metacast(char const*)
                 U KParts::Part::setSelectable(bool)
                 U KParts::Part::partSelectEvent(KParts::PartSelectEvent*)
                 U KParts::Part::guiActivateEvent(KParts::GUIActivateEvent*)
                 U KParts::Part::partActivateEvent(KParts::PartActivateEvent*)
                 U KParts::Part::embed(QWidget*)
                 U KParts::Part::widget()
                 U KParts::Part::hitTest(QWidget*, QPoint const&)
                 U KParts::Part::setWidget(QWidget*)
                 U KParts::Part::~Part()
                 U KParts::Part::~Part()
                 U KParts::Part::~Part()
                 U KParts::PartBase::setComponentData(KComponentData const&)
                 U KParts::PartBase::setComponentData(KComponentData const&,
bool)
                 U KParts::PartBase::~PartBase()
                 U KParts::PartBase::~PartBase()
                 U KParts::Part::metaObject() const
0000000000000000 V construction vtable for KParts::Part-in-KOrg::Part
0000000000000000 V construction vtable for KParts::PartBase-in-KOrg::Part
                 U non-virtual thunk to KParts::Part::~Part()
                 U non-virtual thunk to KParts::Part::~Part()
                 U typeinfo for KParts::Part
                 U typeinfo for KParts::PartBase
                 U virtual thunk to KParts::Part::~Part()
                 U virtual thunk to KParts::Part::~Part()
                 U virtual thunk to KParts::PartBase::~PartBase()
                 U virtual thunk to KParts::PartBase::~PartBase()
                 U virtual thunk to
KParts::PartBase::setComponentData(KComponentData const&)