[XLC++ 8.0/AIX] unsats on extern template and virtual inheritance
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Key: STDCXX-381
URL: https://issues.apache.org/jira/browse/STDCXX-381
Project: C++ Standard Library
Issue Type: Bug
Components: External
Environment: XLC++/AIX
Reporter: Martin Sebor
PMR 02342,K78,000
The following script is expected to run successfully to completion and end with
the line "Success." Instead, it fails with an error, producing the line
"Failure." on stdout. The test case reproduces a bug in the XLC++
implementation of the extern template language extension that causes XLC++ to
fail to emit symbols required for the program to link. The test case shows that
the problem is caused by the use of virtual inheritance in the class hierarchy,
and that without it the program links successfully. This bug prevents the
extern template feature from being used, for example, in C++ Standard Library
Iostreams.
$ cat t.cpp && xlC -qversion && xlC -c -DINSTANTIATE_B t.cpp -o b.o && xlC -c
-DINSTANTIATE_C t.cpp -o c.o && xlC -c t.cpp && xlC t.o b.o c.o && xlC -c
-DUSE_A -DINSTANTIATE_B t.cpp -o b.o && xlC -c -DUSE_A -DINSTANTIATE_C t.cpp -o
c.o && xlC -c -DUSE_A t.cpp && xlC t.o b.o c.o && echo Success. || echo
Failure.
struct A { virtual ~A (); };
#ifdef USE_A
template <class T> struct B: A { ~B (); };
#else
template <class T> struct B { ~B (); };
#endif
template <class T> B<T>::~B () { }
template <class T> struct C: B<T> { };
#ifdef INSTANTIATE_B
A::~A () { }
template struct B<char>;
#elif defined INSTANTIATE_C
template struct C<char>;
#else
extern template struct B<char>;
extern template struct C<char>;
int main () { C<char> c; }
#endif
IBM XL C/C++ Enterprise Edition V8.0 for AIX
Version: 08.00.0000.0012
ld: 0711-317 ERROR: Undefined symbol: Virtual table for class "C<char>": first
non-inline virtual function in
"C<char>" is not defined.
ld: 0711-345 Use the -bloadmap or -bnoquiet option to obtain more information.
Failure.
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