IV34557: NAME LOOKUP ERROR WITH -QLANGLVL=variadictemplates

March 2013 PTF for XL C/C++ for AIX, V12.1

APAR status

• Closed as program error.

Error description

• Compiling the follwoing test case  gives name lookup error
  using -qlanglvl=variadictemplates or -qlanglvl=extended0x.
  namespace boost { namespace date_time {
    template < class date_type >
    class date_facet {
      void put(char fill_char, date_type const & d) const
      {
        //The following line of code required the date to support
  a to_tm
  function
        to_tm(d);
      }
    };
  }}
  namespace boost { namespace gregorian {
    class date {};
    typedef boost::date_time::date_facet<date> date_facet;
    signed to_tm(date const &)
    {
      return 0;
    }
  }}
  signed main(void) {
    boost::gregorian::date_facet facet;
    return 0;
  }
  $ xlC -q'langlvl=extended0x' -o xlc12_defect_namelookup
  xlc12_defect_namelookup.cpp
  "xlc12_defect_namelookup.cpp", line 24.7: 1540-0274 (S) The name
  lookup for "to_tm" did not find a declaration.
  "xlc12_defect_namelookup.cpp", line 24.7: 1540-1226 (I)
  Declarations for non-dependent names are resolved in the
  template definition.
  "xlc12_defect_namelookup.cpp", line 24.7: 1540-1227 (I) "to_tm"
  does not depend on a template argument.$
  

Local fix

• 1. Do not use -qlanglvl=variadictemplates or
  -qlanglvl=extended0x;
  2. Move the function "to_tm" into the global namespace.
  

Problem summary

• PROBLEM DESCRIPTION: Invalid name lookup error found in
  template definition
  
  USERS AFFECTED: The problem may be exposed when using
  -qtmplparse=error or -qlanglvl=variadictemplates allowing the
  compiler to type check non-depenent expressions in a template
  definition.   The compiler was missing the fact that a name was
  dependent and analyzing it in the template definition causing
  the error.
  

Problem conclusion

• The problem is fixed. Apply recommended service.
  

Temporary fix

Comments

APAR Information

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

  LI77180

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

Fix information

• Fixed component name

  XL C/C++ FOR AI

• Fixed component ID

  5725C7200

Applicable component levels

• RC10 PSY U858524

     UP C