IV53918: C COMPILER INCORRECTLY REPORTS THAT AN IDENTIFIER IS UNDECLARED

XL C for AIX Fix Pack 8 (March 2014 PTF) for 12.1
XL C/C++ for AIX Fix Pack 8 (March 2014 PTF) for 12.1
XL C/C++ for AIX Fix Pack 11 (February 2015 PTF) for 12.1
XL C for AIX Fix Pack 12 (May 2015 PTF) for 12.1
XL C/C++ for AIX Fix Pack 12 (May 2015 PTF) for 12.1
XL C/C++ for AIX Fix Pack 13 (August 2015 Update) for 12.1
XL C/C++ for AIX Fix Pack 14 (December 2015 Update) for 12.1
XL C for AIX Fix Pack 15 (April 2016 Update) for 12.1
XL C/C++ for AIX Fix Pack 15 (April 2016 Update) for 12.1
XL C for AIX Fix Pack 16 (July 2016 Update) for 12.1
XL C/C++ for AIX Fix Pack 16 (July 2016 Update) for 12.1
XL C/C++ for AIX Fix Pack 17 (November 2016 Update) for 12.1
XL C for AIX Fix Pack 17 (November 2016 Update) for 12.1
XL C for AIX Fix Pack 18 (February 2017 Update) for 12.1
XL C/C++ for AIX Fix Pack 18 (February 2017 Update) for 12.1
XL C for AIX Fix Pack 19 (August 2017 Update) for 12.1
XL C/C++ for AIX Fix Pack 19 (August 2017 Update) for 12.1
XL C for AIX Fix Pack 20 (March 2018 Update) for 12.1
XL C/C++ for AIX Fix Pack 20 (March 2018 Update) for 12.1
XL C for AIX Fix Pack 9 (July 2014 PTF) for 12.1
XL C/C++ for AIX Fix Pack 9 (July 2014 PTF) for 12.1
XL C for AIX Fix Pack 10 (October 2014 PTF) for 12.1
XL C/C++ for AIX Fix Pack 10 (October 2014 PTF) for 12.1
XL C for AIX Fix Pack 11 (February 2015 PTF) for 12.1
XL C for AIX Fix Pack 13 (August 2015 Update) for 12.1
XL C for AIX Fix Pack 14 (December 2015 Update) for 12.1
XL C/C++ for AIX Fix Pack 21 (January 2019 Update) for 12.1
XL C for AIX Fix Pack 21 (January 2019 Update) for 12.1

APAR status

• Closed as program error.

Error description

• The 'cc' compiler issues an error message related to an
  identifier even though the identifier has been declared.
  
  ======Compile Command:
  $ cc -c sample.c
  
  
  ======Test case:
  $ cat sample.c
  typedef signed long long        int64_t;
  typedef unsigned long long      uint64_t;
  typedef int64_t                 intmax_t;
  typedef uint64_t                uintmax_t;
  
  enum { SYSINT_BUFSIZE =
           (((((((sizeof (uintmax_t) * (8) - (! ((__typeof__
  (uintmax_t)) 0 < (__typeof__ (uintmax_t)) -1))) * 146 + 484) /
  485) + (! ((__typeof__ (uintmax_t)) 0 < (__typeof__ (uintmax_t))
  -1))) + 1)) < ((((((sizeof (intmax_t) * (8) - (! ((__typeof__
  (intmax_t)) 0 < (__typeof__ (intmax_t)) -1))) * 146 + 484) /
  485) + (! ((__typeof__ (intmax_t)) 0 < (__typeof__ (intmax_t))
  -1))) + 1)) ? ((((((sizeof (intmax_t) * (8) - (! ((__typeof__
  (intmax_t)) 0 < (__typeof__ (intmax_t)) -1))) * 146 + 484) /
  485) + (! ((__typeof__ (intmax_t)) 0 < (__typeof__ (intmax_t))
  -1))) + 1)) : ((((((sizeof (uintmax_t) * (8) - (! ((__typeof__
  (uintmax_t)) 0 < (__typeof__ (uintmax_t)) -1))) * 146 + 484) /
  485) + (! ((__typeof__ (uintmax_t)) 0 < (__typeof__ (uintmax_t))
  -1))) + 1))) };
  
  void
  show_snapshot_field_ranges (void)
  {
    char minbuf[((SYSINT_BUFSIZE) < ((((((sizeof (intmax_t) * (8)
  - (! ((__typeof__ (intmax_t)) 0 < (__typeof__ (intmax_t)) -1)))
  * 146 + 484) / 485) + (! ((__typeof__ (intmax_t)) 0 <
  (__typeof__ (intmax_t)) -1))) + 1)) ? ((((((sizeof (intmax_t) *
  (8) - (! ((__typeof__ (intmax_t)) 0 < (__typeof__ (intmax_t))
  -1))) * 146 + 484) / 485) + (! ((__typeof__ (intmax_t)) 0 <
  (__typeof__ (intmax_t)) -1))) + 1)) : (SYSINT_BUFSIZE))];
    char maxbuf[((SYSINT_BUFSIZE) < ((((((sizeof (uintmax_t) * (8)
  - (! ((__typeof__ (uintmax_t)) 0 < (__typeof__ (uintmax_t))
  -1))) * 146 + 484) / 485) + (! ((__typeof__ (uintmax_t)) 0 <
  (__typeof__ (uintmax_t)) -1))) + 1)) ? ((((((sizeof (uintmax_t)
  * (8) - (! ((__typeof__ (uintmax_t)) 0 < (__typeof__
  (uintmax_t)) -1))) * 146 + 484) / 485) + (! ((__typeof__
  (uintmax_t)) 0 < (__typeof__ (uintmax_t)) -1))) + 1)) :
  (SYSINT_BUFSIZE))];
  }
  

Local fix

• Use temporaries to store the size of minbuf and maxbuf
  
  
  typedef signed long long        int64_t;
  typedef unsigned long long      uint64_t;
  typedef int64_t                 intmax_t;
  typedef uint64_t                uintmax_t;
  
  enum { SYSINT_BUFSIZE =
           (((((((sizeof (uintmax_t) * (8) - (! ((__typeof__
  (uintmax_t)) 0 < (__typeof__ (uintmax_t)) -1))) * 146 + 484) /
  485) + (! ((__typeof__ (uintmax_t)) 0 < (__typeof__ (uintmax_t))
  -1))) + 1)) < ((((((sizeof (intmax_t) * (8) - (! ((__typeof__
  (intmax_t)) 0 < (__typeof__ (intmax_t)) -1))) * 146 + 484) /
  485) + (! ((__typeof__ (intmax_t)) 0 < (__typeof__ (intmax_t))
  -1))) + 1)) ? ((((((sizeof (intmax_t) * (8) - (! ((__typeof__
  (intmax_t)) 0 < (__typeof__ (intmax_t)) -1))) * 146 + 484) /
  485) + (! ((__typeof__ (intmax_t)) 0 < (__typeof__ (intmax_t))
  -1))) + 1)) : ((((((sizeof (uintmax_t) * (8) - (! ((__typeof__
  (uintmax_t)) 0 < (__typeof__ (uintmax_t)) -1))) * 146 + 484) /
  485) + (! ((__typeof__ (uintmax_t)) 0 < (__typeof__ (uintmax_t))
  -1))) + 1))) };
  
  void
  show_snapshot_field_ranges (void)
  {
    int temp1 = ((SYSINT_BUFSIZE) < ((((((sizeof (intmax_t) * (8)
  - (! ((__typeof__ (intmax_t)) 0 < (__typeof__ (intmax_t)) -1)))
  * 146 + 484) / 485) + (! ((__typeof__ (intmax_t)) 0 <
  (__typeof__ (intmax_t)) -1))) + 1)) ? ((((((sizeof (intmax_t) *
  (8) - (! ((__typeof__ (intmax_t)) 0 < (__typeof__ (intmax_t))
  -1))) * 146 + 484) / 485) + (! ((__typeof__ (intmax_t)) 0 <
  (__typeof__ (intmax_t)) -1))) + 1)) : (SYSINT_BUFSIZE));
    int temp2 = ((SYSINT_BUFSIZE) < ((((((sizeof (uintmax_t) * (8)
  - (! ((__typeof__ (uintmax_t)) 0 < (__typeof__ (uintmax_t))
  -1))) * 146 + 484) / 485) + (! ((__typeof__ (uintmax_t)) 0 <
  (__typeof__ (uintmax_t)) -1))) + 1)) ? ((((((sizeof (uintmax_t)
  * (8) - (! ((__typeof__ (uintmax_t)) 0 < (__typeof__
  (uintmax_t)) -1))) * 146 + 484) / 485) + (! ((__typeof__
  (uintmax_t)) 0 < (__typeof__ (uintmax_t)) -1))) + 1)) :
  (SYSINT_BUFSIZE));
    char minbuf[temp1];
    char maxbuf[temp2];
  }
  

Problem summary

• USERS AFFECTED:
  Users of typeof extension in array declare are affected by this
  issue.
  
  PROBLEM DESCRIPTION:
  The compiler fails to analyze symbols in [], if there is typeof
  keyword.
  

Problem conclusion

• The compiler has been fixed to resolve the aboe error.
  

Temporary fix

Comments

APAR Information

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

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

  LI77954

Fix information

• Fixed component name

  XL C FOR AIX

• Fixed component ID

  5725C7100

Applicable component levels

• RC10 PSY UP

     C