IV85628: INVALID LABEL VALUE EXPRESSION CAUSING INTERNAL COMPILER ERROR

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 the 'label value expressions' IBM extension is used
  incorrectly (i.e. referencing a label OUTSIDE the current
  function), the compiler encounters an internal compiler error
  instead of outputting an informative error message.
  
  
     === TEST CASE ===
  
  static void* ext[1] = { &&sym };
  
  void test()
  {
      int check = 0;
      switch (check)
      {
        sym:
        default: {}
        break;
      }
  }
  
  $ xlc -c test.c
  xlc: 1501-230 (S) Internal compiler error; please contact your
  Service Representative. For more information visit:
  http://www.ibm.com/support/docview.wss?uid=swg21110810
  $
  

Local fix

• Correct invalid label usage.
  

Problem summary

• PROBLEM DESCRIPTION:
  Compilation failed with an internal compiler error.
  
  USERS AFFECTED:
  Users attempting to use the 'label value expression' extension
  incorrectly (outside of a function scope).
  

Problem conclusion

• The compiler now issues an error diagnostic instead of failing
  with an internal compiler error when compiling label value
  expressions that appear outside function scope.
  

Temporary fix

Comments

APAR Information

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

  IV85023

• 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

     UP