LI77615: MULTIPLE DEFINITION OF OMP CRITICAL LINK ERROR

XL C/C++ for Linux Fix Pack 8 (October 2015 Update) for 12.1
XL C/C++ for Linux Fix Pack 4 (October 2013 Update) for 12.1
XL C/C++ for Linux Fix Pack 5 (December 2013 Update) for 12.1
XL C/C++ for Linux Fix Pack 6 (February 2014 Update) for 12.1
XL C/C++ for Linux Fix Pack 7 (May 2014 Update) for 12.1

APAR status

• Closed as program error.

Error description

• Consider the following testcase:
  
  $cat first.cc
  int q;
  int main(int argc, char** argv)
  {
    _Pragma("omp critical(someval)")
      q = 0;
    _Pragma("omp critical(someval)")
      q = 1;
    return 0;
  }
  
  $cat second.cc
  extern int q;
  void f()
  {
    _Pragma("omp critical(someval)")
      q = 10;
  }
  
  Compile:
  bgxlC_r -qsmp=omp -c  first.cc second.cc
  
  Link:
  bgxlC_r -qsmp=omp -o program first.o second.o
  
  Compiler incorrectly issues error messages at link time:
  
  second.o:(.bss+0x0): multiple definition of
  `__ompCritical::someval'
  first.o:(.bss+0x0): first defined here
  second.o:(.bss+0x0): multiple definition of
  `__ompCritical::someval'
  first.o:(.bss+0x0): first defined here
  

Local fix

• Not available
  

Problem summary

• Some OpenMP objects were marked isnotcommon even when necessary
  (due to C++ default)
  

Problem conclusion

• Override the default storage class for openmp locking
  primitives on C++ compiler
  

Temporary fix

Comments

APAR Information

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

  LI77250

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

Fix information

• Fixed component name

  XL C/C++ FOR LI

• Fixed component ID

  5725C7300

Applicable component levels

• RC10 PSN LI77250

     UP06/09/13