IJ24700: LD INVOCATION FROM XL WHEN USING OFFLOADING CAN CAUSE RACE CONDITION IN PARALLEL MAKE

APAR status

• Closed as program error.

Error description

• LD INVOCATION FROM XL WHEN USING OFFLOADING CAN CAUSE
  RACE CONDITION IN PARALLEL MAKE, USING V16.1
  
  ----------------------------------------------------------------
  
  =====COMPILE COMMAND:
  
  $ xlc -qsmp=omp -qoffload -o /ccs/home/brenaud/src/../a.out
  hello.c -Wl,-v 2>&1 |grep ls2 |grep unlink
  unlink: a.ls2
  
  
  ====TESTCASE:
  
  #include <stdio.h>
      int main() {
         // printf() displays the string inside quotation
         printf("Hello, World!");
         return 0;
      }
  

Local fix

• N/A
  

Problem summary

• USERS AFFECTED:
  Users of XL C/C++ for Linux, V16.1.x and XL Fortran for Linux,
  V16.1.x who use the -qoffload option with a parallel build
  system (such as make -j)
  
  PROBLEM DESCRIPTION:
  When compiling files with -qsmp=omp -qoffload, if the -o option
  is specified to provide the path and name of the output file,
  and if the name of the output file does not contain the '.'
  character, while the path does, the compiler uses a predefined
  name for one of the temporary files it creates in the linking
  process.  This is a problem because concurrent invocations of
  the compiler would use the same temporary file name and
  interfere with each other.
  
  For example:
  xlC x.cpp -c -qsmp=omp -qoffload -o ../obj_x
  xlC y.cpp -c -qsmp=omp -qoffload -o ../obj_y
  
  If the two compilation commands above are executed concurrently,
  both will use the same name for a compiler-generated temporary
  file.  As a result, one of the compilations will fail.
  

Problem conclusion

• The problem has been fixed.
  

Temporary fix

Comments

APAR Information

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

  LI81347

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

Fix information

• Fixed component name

  XL C/C++ FOR AI

• Fixed component ID

  5725C7200

Applicable component levels