IZ42393: UNNECESSARY SYMBOL IS GENERATED

November 2009 PTF for XL C/C++ for AIX, V10.1
October 2010 PTF for XL C/C++ for AIX, V10.1
May 2012 PTF for XL C/C++ for AIX, V10.1
January 2013 PTF for XL C/C++ for AIX, V10.1
XL C/C++ for AIX Fix Pack 18 (July 2013 PTF) for 10.1
XL C/C++ for AIX Fix Pack 19 (October 2013 PTF) for 10.1
XL C/C++ for AIX Fix Pack 21 (October 2015 PTF) for 10.1
August 2009 PTF for XL C/C++ for AIX, V10.1
March 2010 PTF for XL C/C++ for AIX, V10.1
April 2010 PTF for XL C/C++ for AIX, V10.1
June 2010 PTF for XL C/C++ for AIX, V10.1
May 2011 PTF for XL C/C++ for AIX, V10.1
October 2011 PTF for XL C/C++ for AIX, V10.1
February 2012 PTF for XL C/C++ for AIX, V10.1
September 2012 PTF for XL C/C++ for AIX, V10.1
February 2009 PTF for XL C/C++ for AIX, V10.1
May 2009 PTF for XL C/C++ for AIX, V10.1
XL C/C++ for AIX Fix Pack 20 (October 2014 PTF) for 10.1

APAR status

• Closed as program error.

Error description

• The compiler generates unnecessary symbol:
  
  $ cat tc.cpp
  main(){}
  $ xlc++ -c tc.cpp && nm tc.o
           U __IBMCPlusPlusExceptionV3
  00000000 T main
  

Local fix

• N/A
  

Problem summary

• Users will be affected when the codes contain no exceptions,
  and compiler linkage created to the runtime is not intended.
  
  When a project is built without exceptions, the output of nm on
  the resultant object files shows that a link has been created
  to the c++ exception handling runtime.
  

Problem conclusion

• To address this issue, the compiler will insert a check that
  determines if the project is actually using exceptions or not.
  If so, insert the linkage, otherwise do not.
  
  This fix will be applied to a future PTF.
  

Temporary fix

Comments

APAR Information

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

  LI73818

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

Fix information

• Fixed component name

  XL C++ AIX

• Fixed component ID

  5724U8100

Applicable component levels