LI71159: Compiler error 1540-0216 due to compiler rejecting const_cast for an array

Latest updates for XL C/C++ Advanced Edition V7 for Linux

APAR status

• Closed as program error.

Error description

• Compiler reports error for the following test case. It compiles
  fine if a scalar int is used.
  
  
  typedef int IntArray[2];
  
  void fakeFunc(IntArray &) { }
  
  void constCastArray() {
     const IntArray i = { 1, 2 };
     fakeFunc(const_cast<IntArray &>(i));
  }
  
  $ xlC const_int_array_test.cxx
  "const_int_array_test.hxx", line 5.41: 1540-0216 (S) An
  expression of type "const IntArray" cannot be converted to type
  "IntArray &".
  

Local fix

• n/a
  

Problem summary

• USER AFFECTED:
  Users of const_cast with const arrays
  casting to non-const array references.
  
  PROBLEM DESCRIPTION:
  Compiler generate unnecessary error message
  
  EXPECTED ERROR:
  1540-0216 (S) An expression of type "const IntArray"
  cannot be converted to type "IntArray
  &".
  When working, there should be no error.
  
  WORKAROUND:
  Use old-style casts like:
  
  So if it looks like:
     static_cast<X*>(&a)
  
  It can be replaced by:
     (X*)(&a)
  

Problem conclusion

• Can be fixed for both the one and higher
  dimensoin case.
  

Temporary fix

Comments

APAR Information

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

  IY78555

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

Fix information

• Fixed component name

  XL C/C++ SLES9

• Fixed component ID

  5724K7700

Applicable component levels

• R700 PSY

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