IV34104: FOR LOOP EXPRESSION3 NOT EVALUATED

XL C/C++ for AIX Fix Pack 14 (May 2013 PTF) for 11.1
XL C/C++ for AIX Fix Pack 15 (August 2013 PTF) for 11.1
XL C/C++ for AIX Fix Pack 16 (November 2013 PTF) for 11.1
XL C/C++ for AIX Fix Pack 17 (February 2014 PTF) for 11.1
XL C/C++ for AIX Fix Pack 18 (May 2014 PTF) for 11.1
XL C/C++ for AIX Fix Pack 19 (August 2014 PTF) for 11.1
XL C/C++ for AIX Fix Pack 20 (November 2014 PTF) for 11.1
XL C/C++ for AIX Fix Pack 21 (April 2015 PTF) for 11.1
XL C/C++ for AIX Fix Pack 22 (September 2015 PTF) for 11.1
XL C/C++ for AIX Fix Pack 23 (March 2016 PTF) for 11.1
XL C/C++ for AIX Fix Pack 24 (September 2016 PTF) for 11.1

APAR status

• Closed as program error.

Error description

• When compiling with C++, a for loop with multiple expressions in
  the expression3 location is not performing all expressions.  In
  the case where a loop increment or decrement is done, an
  infinite loop may be seen.
  
      ===== TEST CASE =====
  
     for ( i=0; i<10; i++,myint1,myint2=5 )
  

Local fix

• Remove expressions that do not increment/decrement/set values.
  

Problem summary

• PROBLEM DESCRIPTION:
  The C++ compiler is optimizing away part of a comma comma
  expression side effect when it finds a part that has no side
  effect.
  
  USERS AFFECTED:
  A comma expression such as  'a++,a,a1=5'  would eliminate the
  'a++'.
  

Problem conclusion

• The problem has been resolved.
  

Temporary fix

Comments

APAR Information

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

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

  LI77381 LI77406 IV44256 LI77591

Fix information

• Fixed component name

  XL C/C++ AIX

• Fixed component ID

  5724X1300

Applicable component levels

• RB10 PSY U859089

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