LI74057: STATIC MEMBER __THREAD VARIABLE ISSUE

June 2009 Update for XL C/C++ Advanced Edition for Linux, V9.0
February 2010 Update for XL C/C++ Advanced Edition for Linux, V9.0
February 2011 Update for XL C/C++ Advanced Edition for Linux, V9.0

APAR status

• Closed as program error.

Error description

• The following error is received when compiling this testcase:
  "1540-2638 (S) The __thread keyword can only be specified for
  external or static data."
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  ______________________________________________________________
  ______________________________________________________________
  
  #include <omp.h>
  
  
  class A
  {
    public:
      static __thread int localInt;
  };
  __thread int A::localInt;
  
  int main ()
  {
    A::localInt = 10;
    printf( "Static's value: %d\n", A::localInt );
     return 0;
  }
  

Local fix

• Use namespace scoped thread static variables instead of member
  thread static variables.
  
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  ______________________________________________________________
  
  For example:
  
  namespace A
  {
      static __thread int localInt;
  };
  
  Instead of:
  
  class A
  {
    public:
      static __thread int localInt;
  };
  __thread int A::localInt;
  

Problem summary

• thread static local and thread static data member variables.
  
  Invalid error diagnostic emitted by compiler.
  

Problem conclusion

• The invalid diagnostics have been corrected and correct TLS
  functionality confirmed.  Backfix of 322827, 322827.1 and
  346167, all relating to incorrect TLS diagnostics.
  

Temporary fix

Comments

APAR Information

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

  IZ34321

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

Fix information

• Fixed component name

  XL C/C++ RHEL5

• Fixed component ID

  5724S7310

Applicable component levels

• R900 PSN IZ34321

     UP06/09/13