[Bug c++/17182] New: [3.5 regression] virtual destructor not in shared library

[Ralf dot Wildenhues at gmx dot de]

This example fails on CVS HEAD gcc (as of yesterday), but not 3.4, neither does
the original problem from which I stripped this example fail with CVS from 6
weeks ago.

/* Save this as a.cc
   g++ -fPIC -DPIC -c -o a.o a.cc
   g++ -shared a.o -o libfoo.so
   Now, link a trivial program against it (int main(void) { }).
   g++ -o b b.cc -L. -lfoo
*/
struct B {
  virtual ~B () { }
  virtual void dummy() { }
};
                                                                               
              
void bar()
{
  struct C : public B {
    C (const B& b) : B(b) { }
  };
  B b;
  new C(b);
}

The error given is
./libfoo.so: undefined reference to `bar()::C::~C()'
./libfoo.so: undefined reference to `bar()::C::~C()'
with current gcc.

BTW, the 'new C(b);' line is not necessary with CVS HEAD to expose the bug. 
With 3.4, however, class C is optimized away completely without this line.

Regards,
Ralf

-- 
           Summary: [3.5 regression] virtual destructor not in shared
                    library
           Product: gcc
           Version: 3.5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: Ralf dot Wildenhues at gmx dot de
                CC: gcc-bugs at gcc dot gnu dot org
  GCC host triplet: i686-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17182