LI73499: TEMPLATE UNDEFINED SYMBOL

September 2010 Update for XL C/C++ Advanced Edition for Blue Gene/L, V9.0
June 2008 Update for XL C/C++ Advanced Edition for Blue Gene/L, V9.0
April 2009 Update for XL C/C++ Advanced Edition for Blue Gene/L, V9.0

APAR status

• Closed as program error.

Error description

• The following template testcase can't link with error message of
  undefined symbol.
  
  The class template member function takes a function
  with typedef'd parameter.
  
  
  ===== TESTCASE:
  
  $ cat t.cpp
  template <class T>
  struct A
  {
      typedef T U;
      void apply(void f(const U&)) const;
  };
  
  template <class T>
  void A<T>::apply(void f(const U&)) const { }
  
  struct S { };
  void bar (const S&) { };
  
  int main ()
  {
    A<S>().apply(bar);
    return 0;
  }
  
  
  $ xlC t.cpp
  ld: 0711-317 ERROR: Undefined symbol: .A<S>::apply(void(*)(const
  S&)) const
  ld: 0711-345 Use the -bloadmap or -bnoquiet option to obtain
  more information.
  

Local fix

• N/A
  

Problem summary

• The problem appears when a typedef is used in a pointer to
  function argument of a template function.
  

Problem conclusion

• The compiler did not correctly instantiate the function causing
  a link error. Compiler code has been corrected to resolve the
  problem.
  

Temporary fix

• Avoid using the typedef.
  

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

  IZ10672

• APAR is sysrouted TO one or more of the following:

Fix information

• Fixed component name

  XL C/C++ AE BG/

• Fixed component ID

  5799HJH00

Applicable component levels

• R900 PSN IZ10672

     UP06/09/13