LI76527: SIGNAL 11 IN IPA WHEN USING -O3

XL C/C++ for Linux Fix Pack 8 (January 2014 Update) for 10.1
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

• When compiling the following test case, the compiler is
  encountering an internal error:
  
  
  void foo(unsigned int zSize, int ySize, unsigned int
  flag[zSize][ySize]) {
    for (unsigned int z = 1; z < zSize; ++z) {
      for (int y = 1; y < ySize; ++y) {
        if (flag[z][1]) {
          double v = 0.0;
        }
      }
    }
  }
  
  
  > xlc -O3 -c test.c
  Calling signal handler...
  1586-494 (U) INTERNAL COMPILER ERROR: Signal 11.
  >
  

Local fix

• Compile with a lower optimization level.
  

Problem summary

• USERS AFFECTED:
  Only the users who use 'unsigned int' to access multi-dimension
  variable length arrays (VLAs) maybe affected by this issue.
  
  PROBLEM DESCRIPTION:
  The access of multi-dimension VLA arguments may cause IPA to
  crash.
  

Problem conclusion

• The compiler has been fixed to prevent a crash when accessing
  multi-dimensional VLA arguments.
  

Temporary fix

Comments

APAR Information

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

  LI76050

• 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 LI76050

     UP06/09/13