LI75110: LINE NUMBERS NOT SHOWING WITH -Q64 FOR LARGE SOURCE CODE.

October 2009 Update for XL C/C++ for Linux, V10.1
June 2011 Update for XL C/C++ for Linux, V10.1
XL C/C++ for Linux Fix Pack 8 (January 2014 Update) for 10.1
August 2010 Update for XL C/C++ for Linux, V10.1
January 2011 Update for XL C/C++ for Linux, V10.1
January 2012 Update for XL C/C++ for Linux, V10.1
July 2012 Update for XL C/C++ for Linux, V10.1

APAR status

• Closed as program error.

Error description

• The compiler does not seem to be putting the correct line
  numbers for large source code compiled with -q64. In 64 bit
  mode, it should be able to show the line numbers upto 2^32
  lines.
  
  ===== ACTUAL OUTPUT:
  //This one is as expected
  $ xlC_r -o tcSMALL tcSMALL.c -q64 -g
  $ ./tcSMALL
  Abort process (core dumped)
  $ dbx tcSMALL core
  Type 'help' for help.
  [using memory image in core]
  reading symbolic information ...
  
  IOT/Abort trap in pthread_kill at 0x90000000018d6bc ($t1)
  0x90000000018d6bc (pthread_kill+0x88) e8410028          ld
  r2,0x28(r1)
  (dbx) where
  pthread_kill(??, ??) at 0x90000000018d6bc
  _p_raise(??) at 0x90000000018d0d0
  raise.raise(??) at 0x900000000341298
  abort() at 0x90000000036cdac
  main(), line 30000 in "tcSMALL.c"
  (dbx) quit
  
  
  //This one is the one that fails. Also, notice the warning
  message
  $ xlC_r -o tcBIG tcBIG.c -q64 -g
     65533  1500-042: (W) WARNING in main: Debug line numbers
  >65535
  discarded.  Reduce file size and recompile to allow full
  debugging.
  $ ./tcBIG
  Abort process (core dumped)
  $ dbx tcBIG core
  Type 'help' for help.
  [using memory image in core]
  reading symbolic information ...
  
  IOT/Abort trap in pthread_kill at 0x90000000018d6bc ($t1)
  0x90000000018d6bc (pthread_kill+0x88) e8410028          ld
  r2,0x28(r1)
  (dbx) where
  pthread_kill(??, ??) at 0x90000000018d6bc
  _p_raise(??) at 0x90000000018d0d0
  raise.raise(??) at 0x900000000341298
  abort() at 0x90000000036cdac
  main() at 0x100167298
  (dbx) quit
  
  
  ===== EXPECTED OUTPUT:
  For the failing one above, it should not show the warning
  message when in 64 bit mode and
  it should show the line numbers in the dbx output.
  

Local fix

• n/a
  

Problem summary

• Users debugging code with more than 65536 source lines in 64
  bit mode (-q64)
  are affected by this issue.
  
  Line numbers greater than 65536 were being removed from -g
  data, making it
  impossible for debuggers to map instructions back to
  source line numbers  greater than 65536.
  

Problem conclusion

• The fix is to increase the size of internal storage for line
  number variables.
  

Temporary fix

Comments

APAR Information

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

  IZ55631

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

Fix information

• Fixed component name

  XL C/C++ RHEL52

• Fixed component ID

  5724U8310

Applicable component levels

• RA10 PSN IZ55631

     UP06/09/13