http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58678
Bug ID: 58678
Summary: [4.9 Regression] pykde4-4.11.2 link error
(devirtualization too trigger happy)
Product: gcc
Version: 4.9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: ipa
Assignee: unassigned at gcc dot gnu.org
Reporter: markus at trippelsdorf dot de
pykde4-4.11.2 fails to build:
CMakeFiles/python_module_PyKDE4_phonon.dir/sip/phonon/sipphononpart5.cpp.o:sipphononpart5.cpp:function
release_Phonon_BackendCapabilities_Notifier: error: undefined reference to
'vtable for Phonon::BackendCapabilities::Notifier'
/usr/lib/gcc/x86_64-pc-linux-gnu/4.9.0/../../../../x86_64-pc-linux-gnu/bin/ld:
the vtable symbol may be undefined because the class is missing its key
function
CMakeFiles/python_module_PyKDE4_phonon.dir/sip/phonon/sipphononpart5.cpp.o:sipphononpart5.cpp:function
Phonon::BackendCapabilities::Notifier::~Notifier(): error: undefined reference
to 'vtable for Phonon::BackendCapabilities::Notifier'
/usr/lib/gcc/x86_64-pc-linux-gnu/4.9.0/../../../../x86_64-pc-linux-gnu/bin/ld:
the vtable symbol may be undefined because the class is missing its key
function
CMakeFiles/python_module_PyKDE4_phonon.dir/sip/phonon/sipphononpart5.cpp.o:sipphononpart5.cpp:function
Phonon::BackendCapabilities::Notifier::~Notifier(): error: undefined reference
to 'vtable for Phonon::BackendCapabilities::Notifier'
/usr/lib/gcc/x86_64-pc-linux-gnu/4.9.0/../../../../x86_64-pc-linux-gnu/bin/ld:
the vtable symbol may be undefined because the class is missing its key
function
collect2: error: ld returned 1 exit status
Reduced:
markus@x4 tmp % cat test.ii
class A {
public:
virtual ~A();
};
class B : A {
virtual int m_fn1();
};
void fn1() {
delete reinterpret_cast<B*>(1);
}
markus@x4 tmp % g++ -O1 -c test.ii
markus@x4 tmp % nm test.o | c++filt
0000000000000000 T fn1()
markus@x4 tmp % g++ -O2 -c test.ii
markus@x4 tmp % nm test.o | c++filt
0000000000000000 T fn1()
U operator delete(void*)
U A::~A()
0000000000000000 W B::~B()
0000000000000000 W B::~B()
0000000000000000 W B::~B()
0000000000000000 n B::~B()
U vtable for B
markus@x4 tmp % clang++ -O2 -c test.ii
markus@x4 tmp % nm test.o | c++filt
0000000000000000 T fn1()
markus@x4 tmp %
Started with r202145.
