LI78469: INCORRECT DEBUG INFO FOR VARIABLE LENGTH ARRAY

XL C/C++ for Linux Fix Pack 2 (February 2015 Update) for 13.1

APAR status

• Closed as program error.

Error description

• Debug information generated for variable length arrays is
  incorrect.  When using a debugger to look at variable length
  array values, incorrect data is output.
  
  
     ===  TEST CASE  ===
  
  #include <stdio.h>
  #include <memory.h>
  #include <string.h>
  
  int main()
  {
       char CCC[strlen("11111111")];
  
       memset(CCC, 0, sizeof(CCC));
       sprintf(CCC, "abcdef");
  
       return 0;
  }
  
  
  $ dbx test_case
  reading symbolic information ...
  (dbx) stop in main
  (dbx) run
  ...
  stopped in main at line 9
      9        sprintf(CCC, "abcdef");
  (dbx) step
  (dbx) p CCC
  "/&#65429;"
  (dbx)
  

Local fix

Problem summary

• PROBLEM DESCRIPTION:
  Debug information for variable length arrays - both stabstrings
  and DWARF - is incorrect, and not recognized by debuggers.
  
  USERS AFFECTED:
  Users wishing to debug variable length arrays using -g
  generated debug information.
  

Problem conclusion

• The debug information generated was corrected, and variable
  length arrays are now recognized by debuggers correctly.
  

Temporary fix

Comments

APAR Information

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

  IV64517

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

Fix information

• Fixed component name

  XL C/C++ FOR LI

• Fixed component ID

  5725C7300

Applicable component levels

• RD10 PSN IV64517

     UP06/09/13