LI76952: COMPILER ERROR WITH TEMPLATES AND NAMESPACES

November 2012 Update for XL C/C++ for Blue Gene/Q, V12.1
February 2013 Update for XL C/C++ for Blue Gene/Q, V12.1
May 2013 Update for XL C/C++ for Blue Gene/Q, V12.1

APAR status

• Closed as program error.

Error description

• The following test case fails to compile successfully using the
  following options:
  
  
  ===== COMPILE COMMAND:
  mpixlcxx_r -DNAMESPACE test.cc
  
  
  ===== TESTCASE:
  $ cat test.cc
  #include <iostream>
  using namespace std;
  
  #ifdef NAMESPACE
  namespace Bar {
  #endif
  
  template< class Foo, int N, template <class,int> class C>
  class Odd {
  public:
   // A constructor
   Odd() { }
  };
  
  // The weirdo class
  template< class Foo, int N>
  class CuriouslyRecursive : public Odd<Foo, N,
  CuriouslyRecursive>
  {
  public:
    // A constructor
    CuriouslyRecursive() { }
  };
  
  
  // A random class to use for the Foo templates
  class RandomClass
  {
  public:
    RandomClass() {}
  };
  
  #ifdef NAMESPACE
  }
  using namespace Bar;
  #endif
  
  int main(int argc, char *argv[])
  {
    CuriouslyRecursive<RandomClass,4> try_this;
  }
  $
  
  
  
  ===== ACTUAL OUTPUT:
  $ mpixlcxx_r test.cc -DNAMESPACE
  "testprog.cc", line 17.7: 1540-0716 (S) The template argument
  "Bar::CuriouslyRecursive" does not match the template parameter
  "template class C".
  "testprog.cc", line 17.7: 1540-0716 (S) The template argument
  "Bar::CuriouslyRecursive<Bar::RandomClass,4>" does not match the
  template parameter "template class C".
  "testprog.cc", line 39.37: 1540-0700 (I) The previous message
  was produced while processing "class
  Bar::CuriouslyRecursive<Bar::RandomClass,4>".
  "testprog.cc", line 37.5: 1540-0700 (I) The previous message was
  produced while processing "main(int, char *[])".
  $
  
  
  ===== EXPECTED OUTPUT:
  Clean compile.
  

Local fix

• Avoid adding the class in a namespace if possible
  

Problem summary

• USERS AFFECTED:
  When a class is defined outside its namespace or outside its
  enclosing class, the scope used to lookup the base class names
  might be incorrect causing a name lookup error.
  
  
  PROBLEM DESCRIPTION:
  Name lookup for base class in the wrong scope for namespace or
  nested class name.
  This leads to a compile time error.
  

Problem conclusion

• The problem has been fixed.
  

Temporary fix

Comments

APAR Information

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

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

Fix information

• Fixed component name

  XL C/C++ FOR BG

• Fixed component ID

  5799AG100

Applicable component levels

• RC10 PSY

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