LI75055: FUNCTION RESOLUTION FAILURE

October 2009 Update for XL C/C++ for Linux, V10.1
June 2011 Update for XL C/C++ for Linux, V10.1
XL C/C++ for Linux Fix Pack 8 (January 2014 Update) for 10.1
August 2010 Update for XL C/C++ for Linux, V10.1
January 2011 Update for XL C/C++ for Linux, V10.1
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

• The following reduced test case gives out function resolution
  error compiled with xlC. g++ compiles fine.
  
  <small.cxx>
  void func(bool arg){}
  void func(void* arg){}
  
  int main()
  {
  int nCorners[3] = {0, 0, 0};
  func( (nCorners) );
  return 0;
  }
  </small.cxx>
  
  $ xlC small.cxx
  "small.cxx", line 7.1: 1540-0219 (S) The call to "func" has no
  best match.
  "small.cxx", line 7.7: 1540-1228 (I) Argument number 1 is an
  lvalue of type "int [3]".
  "small.cxx", line 2.6: 1540-1202 (I) No candidate is better than
  "func(void *)".
  "small.cxx", line 7.7: 1540-1231 (I) The conversion from
  argument number 1 to "void *" uses "an array-to-pointer
  transformation" followed by "a pointer conversion".
  "small.cxx", line 1.6: 1540-1202 (I) No candidate is better than
  "func(bool)".
  "small.cxx", line 7.7: 1540-1231 (I) The conversion from
  argument number 1 to "bool" uses "an array-to-pointer
  transformation" followed by "a boolean conversion".
  

Local fix

• Replace statement
  
  func( (nCorners) );
  
  with
  
  func( void* (nCorners) );
  

Problem summary

• USERS AFFECTED:
  Users with overloaded functions, especially with con-
  version from pointer to member to bool.
  
  PROBLEM DESCRIPTION:
  The compiler fails to choose the correct function especially
  when the program has two overloaded functions with
  the same rank.
  

Problem conclusion

• The compiler is now able to handle functions with overload
  resolution
  having the same rank.
  

Temporary fix

Comments

APAR Information

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

  IZ51552

• 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 PSY

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