LI72866: I/O stream manipulation problem

Latest updates for XL C/C++ Advanced Edition V8 for Linux
May 2009 Updates for XL C/C++ Advanced Edition V8 for Linux

APAR status

• Closed as program error.

Error description

• Compilation fails with a severe message when doing stream
  manipulation inside a local struct's function.
  e.g.:
  $ cat get_msg.cpp
  #include <iostream>
  #include <fstream>
  #include <iomanip>
  
  int notmain () {
  #ifdef _POS1
    // THIS will cause the problem
    std::ofstream os;
  #endif
    struct S {
      void f () {
  #ifdef _POS2
        // THIS WILL
        std::ofstream os;
  #endif
        std::cout << std::setw(4) << 666 << std::endl;
  #ifdef _POS3
        // THIS WILL
        std::ofstream os;
  #endif
      }
    };
  #ifndef _POS1
  #ifndef _POS2
  #ifndef _POS3
    // THIS will NOT cause the problem
    //std::ofstream os;
  #endif
  #endif
  #endif
    return 0;
  }
  $ xlC_r -D_POS1 -c get_msg.cpp
  "get_msg.cpp", line 20.20: 1540-0253 (S) This use of undefined
  class "std::_Smanip" is not valid.
  $ xlC_r -D_POS2 -c get_msg.cpp
  "get_msg.cpp", line 20.20: 1540-0253 (S) This use of undefined
  class "std::_Smanip" is not valid.
  $ xlC_r -D_POS3 -c get_msg.cpp
  "get_msg.cpp", line 20.20: 1540-0253 (S) This use of undefined
  class "std::_Smanip" is not valid.
  $ xlC_r -c get_msg.cpp
  $
  

Local fix

• Adding this declaration of std::_Smanip before the function with
  the local class (notmain in the example) will resolve the
  problem:
  template struct std::_Smanip<int>;
  

Problem summary

• Due to a compiler defect, the required instantiation
  might happen too late causing compiler errors.
  
  The user would see either an invalid error message for invalid
  use of an incomplete or undefined class OR there might be an
  internal compiler error.
  

Problem conclusion

• The compiler now correctly handles implicit instantiations
  requested while processing local classes.
  

Temporary fix

Comments

APAR Information

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

  IY99901

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

Fix information

• Fixed component name

  XLC/C++ RHEL4

• Fixed component ID

  5724M1610

Applicable component levels

• R800 PSN IY99901

     UP06/09/13