LI75123: INTERNAL COMPILER ERROR IN XLCENTRY WITH -QSMP

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 produces an Internal Compiler Error in
  xlCentry when -qsmp is used.
  
  ===== COMPILE COMMAND:
  xlC_r -qsmp test.cpp
  
  ===== TESTCASE:
  $ cat test.cpp
  #include <vector>
  void iterator_example()
  {
     std::vector<int> vec(23);
     std::vector<int>::iterator it;
     #pragma omp parallel for default(none) shared(vec)
     for (it = vec.begin(); it < vec.end(); it++)
     { // do work with *it
     }
  }
  
  
  ===== ACTUAL OUTPUT:
  xlC_r: 1501-230 (S) Internal compiler error; please contact your
  Service Representative. For more information visit:
  http://www.ibm.com/support/docview.wss?uid=swg21110810
  
  ===== EXPECTED OUTPUT:
  Should not produce an Internal Compiler Error.
  

Local fix

• Use the compiler option -qnoinline as a workaround.
  

Problem summary

• OpenMP users whose parallel for statement
  contains an empty lexical block are affected by this issue.
  
  When trying to parallelize a for statement
  with null lexical block the compiler will produce an internal
  compiler error.
  

Problem conclusion

• When adding statements to a null
  lexical block the statements have to be appended during
  transformation so that an internal trees gets hooked up
  correctly.
  

Temporary fix

Comments

APAR Information

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

  IZ45369

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

Fix information

• Fixed component name

  XL C/C++ SLES10

• Fixed component ID

  5724U8300

Applicable component levels

• RA10 PSN IZ45369

     UP06/09/13