IV85633: CORRUPT OBJECT FILES/DWARF DEBUG INFO WITH LARGE SOURCE FILES

XL C for AIX Fix Pack 2 (July 2016 PTF) for 13.1.3
XL C/C++ for AIX Fix Pack 2 (July 2016 PTF) for 13.1.3
XL C for AIX, V13.1.3.3 Fix Pack (December 2016)
XL C/C++ for AIX, V13.1.3.3 Fix Pack (December 2016)
XL C for AIX, V13.1.3.4 Fix Pack (April 2017)
XL C/C++ for AIX, V13.1.3.4 Fix Pack (April 2017)
XL C for AIX, V13.1.3.5 Fix Pack (July 2018)
XL C/C++ for AIX, V13.1.3.5 Fix Pack (July 2018)
XL C for AIX, V13.1.3.6 Fix Pack (May 2019)
XL C/C++ for AIX, V13.1.3.6 Fix Pack (May 2019)

APAR status

• Closed as program error.

Error description

• When compiling large source files using the DWARF debug format,
  corrupted XCOFF object files are produced that are not accepted
  by AIX utilities, including the linker and the ar archive tool.
  
  Tools such as ar might encounter internal errors due to the
  corrupted object file, while the linker might output errors such
  as:
  
  
  ld: 0711-599 SEVERE ERROR: Section header 5 (.dwinfo) in object
  /tmp/3998512_0.o:
          Fields in the header are invalid:
          s_scnptr = 4175648; s_size = 8608238
  
  ld: 0711-599 SEVERE ERROR: Section header 6 (.dwabrev) in object
  /tmp/3998512_0.o:
          Fields in the header are invalid:
          s_scnptr = 13704128; s_size = 2051
  
  ld: 0711-599 SEVERE ERROR: Section header 7 (.dwarnge) in object
  /tmp/3998512_0.o:
          Fields in the header are invalid:
          s_scnptr = 13706192; s_size = 67184
  
  ld: 0711-599 SEVERE ERROR: Section header 8 (.dwpbnms) in object
  /tmp/3998512_0.o:
          Fields in the header are invalid:
          s_scnptr = 13857344; s_size = 922451
  
  ld: 0711-599 SEVERE ERROR: Section header 9 (.dwpbtyp) in object
  /tmp/3998512_0.o:
          Fields in the header are invalid:
          s_scnptr = 14779824; s_size = 178544
  

Local fix

• Use the stabstring debug format instead of DWARF.
  

Problem summary

• PROBLEM DESCRIPTION:
  When compiling large files with -g and -qdbgfmt=dwarf, the
  resulting object file is corrupted.  The DWARF debug section is
  overwriting the XCOFF scnum value.
  
  USERS AFFECTED:
  Users of DWARF debug information with large source files.
  

Problem conclusion

• The issue has been corrected.
  

Temporary fix

Comments

APAR Information

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

  IV82692

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

Fix information

• Fixed component name

  XL C FOR AIX

• Fixed component ID

  5725C7100

Applicable component levels

• RD13 PSY

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