LI74305: NAMESPACE NAME LOOKUP ERROR

March 2009 Update for XL C/C++ for Linux, V10.1
October 2009 Update for XL C/C++ for Linux, V10.1
June 2011 Update for XL C/C++ for Linux, V10.1
XL C/C++ for Linux Fix Pack 8 (January 2014 Update) for 10.1
August 2010 Update for XL C/C++ for Linux, V10.1
January 2011 Update for XL C/C++ for Linux, V10.1
January 2012 Update for XL C/C++ for Linux, V10.1
July 2012 Update for XL C/C++ for Linux, V10.1

APAR status

• Closed as program error.

Error description

• The following test case is valid, but the xlC compiler
  generates
  error message about name lookup for "foo" did not find a
  declaration.
  
  
  ======= TEST CASE ======
  test.cpp
  
  -------------------------------------
  namespace mynamespace
  {
  } // close namespace mynamespace
  
  using namespace mynamespace;
  
  namespace mynamespace
  {
    namespace
    {
      void foo() {}   // Line 11
    }
  } // close namespace mynamespace
  
  int main(void) {
      ::foo(); // works
      foo();   // should work but doesn't // Line 19
  }
  --------------------------------
  
  xlC -c test.cpp
  "test.cpp", line 19.5: 1540-0274 (S) The name lookup for "foo"
  did
  not find a declaration.
  "test.cpp", line 11.10: 1540-1298 (I) "void foo()" needs to be
  declared in the containing scope to be found by name lookup.
  

Local fix

• As a workaround, we suggest naming the unnamed namespace and
  adding a
  using directive:
  
  namespace mynamespace
  {
  }
  
  using namespace mynamespace;
  
  namespace mynamespace
  {
    namespace A
    {
      void foo() {}
    }
    using namespace A;
  }
  

Problem summary

• USER AFFECTED:
       Affects codes with an unnamed namespace in a namespace,
       which has a previously specified using directive
  
  PROBLEMDESCRIPTION:
       Namelookup through the using directive will not see
       declarations in the nested unnamed namespace.
  

Problem conclusion

• This namelookup defect has been corrected.
  

Temporary fix

Comments

APAR Information

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

  IZ36662

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

  LI74384

Fix information

• Fixed component name

  XL C/C++ SLES10

• Fixed component ID

  5724U8300

Applicable component levels

• RA10 PSN IZ36662

     UP06/09/13