IV72030: CONTINUATION LINE IN COMMENT SECTION AFFECTING #LINE NUMBERS

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 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

• Error message line numbers are not matching the compiled code
  when preprocessing with the -C preserve comments option.
  
  The issue is triggered when a continuation line ( '\' ) is found
  in  the comment section.  The #line statements generated inside
  the comment section are correct, but after the comment section
  the line numbers for actual code are misaligned.
  
  
  
     === TEST CASE ===
  
  test.c, with error on line 9 'aaa bbb':
  
       1  /* \
       2
       3  \
       4
       5  \
       6
       7  \
       8  */
       9  aaa bbb;
      10  int main(void)
      11  {
      12   printf("Hello, world! \n");
      13   return 0;
      14  }
  
  when preprocessed with comments preserved (-E -C):
  
       1  #line 1 "test.c"
       2  /* \
       3
       4  #line 3
       5  \
       6
       7  #line 5
       8  \
       9
      10  #line 7
      11  \
      12  */
      13  aaa bbb;
      14  int main(void)
      15  {
      16   printf("Hello, world! \n");
      17   return 0;
      18  }
  
  compiling the preprocessed file gives the 'aaa bbb' error as
  being on line 12:
  
  "test.c", line 12.1: 1506-166 (S) Definition of function aaa
  requires parentheses.
  "test.c", line 12.5: 1506-276 (S) Syntax error: possible missing
  '{'?
  

Local fix

Problem summary

• PROBLEM DESCRIPTION:
  Incorrect source code line numbers when compiling after
  preprocessing with the -C option.
  
  USERS AFFECTED:
  Users who preprocess code with the -C option.
  

Problem conclusion

• Line number directives in preprocessed code comment sections
  have been removed.  The correct line numbers are now reported.
  

Temporary fix

Comments

APAR Information

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

  IV67892

• 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

• RC10 PSY