IZ51692: Duplicate debug symbols increase object size

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

APAR status

• Closed as program error.

Error description

• For certain compilation units the compiler may insert multiple
  instances of the same debug symbol.
  Since the size of object files can affect link and load times,
  not duplicating these symbols can have significant impact for
  some users.
  

Local fix

• N/A
  

Problem summary

• The compiler is issuing multiple debug strings for "function
  returning a specific type".  These symbols result in larger
  objects which can impact certain performance metrics.
  

Problem conclusion

• The compiler now makes an effort to reuse the matching debug
  strings to reduce the number of duplicates.
  

Temporary fix

Comments

APAR Information

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

  IZ40970

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

Fix information

• Fixed component name

  XL C AIX

• Fixed component ID

  5724U8000

Applicable component levels