LI74310: PREPROCESSOR ERROR

March 2009 Update for XL C/C++ for Linux, V10.1
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

• With the following test case, the preprocessor does not
  pre-precoess the file correctly when it is treated as a C++ test
  case. It works fine for when treated as a C test case.
  
  
  Compile Line:
  
  
  =======Start of tc.c================
  int main()
  {
  #if !((' ' == 32) && ('!' == 33) && ('"' == 34) && ('#' == 35) \
        && ('%' == 37) && ('&' == 38) && ('\'' == 39) && ('(' ==
  40) \
        && (')' == 41) && ('*' == 42) && ('+' == 43) && (',' ==
  44) \
        && ('-' == 45) && ('.' == 46) && ('/' == 47) && ('0' ==
  48) \
        && ('1' == 49) && ('2' == 50) && ('3' == 51) && ('4' ==
  52) \
        && ('5' == 53) && ('6' == 54) && ('7' == 55) && ('8' ==
  56) \
        && ('9' == 57) && (':' == 58) && (';' == 59) && ('<' ==
  60) \
        && ('=' == 61) && ('>' == 62) && ('?' == 63) && ('A' ==
  65) \
        && ('B' == 66) && ('C' == 67) && ('D' == 68) && ('E' ==
  69) \
        && ('F' == 70) && ('G' == 71) && ('H' == 72) && ('I' ==
  73) \
        && ('J' == 74) && ('K' == 75) && ('L' == 76) && ('M' ==
  77) \
        && ('N' == 78) && ('O' == 79) && ('P' == 80) && ('Q' ==
  81) \
        && ('R' == 82) && ('S' == 83) && ('T' == 84) && ('U' ==
  85) \
        && ('V' == 86) && ('W' == 87) && ('X' == 88) && ('Y' ==
  89) \
        && ('Z' == 90) && ('[' == 91) && ('\\' == 92) && (']' ==
  93) \
        && ('^' == 94) && ('_' == 95) && ('a' == 97) && ('b' ==
  98) \
        && ('c' == 99) && ('d' == 100) && ('e' == 101) && ('f' ==
  102) \
        && ('g' == 103) && ('h' == 104) && ('i' == 105) && ('j' ==
  106) \
        && ('k' == 107) && ('l' == 108) && ('m' == 109) && ('n' ==
  110) \
        && ('o' == 111) && ('p' == 112) && ('q' == 113) && ('r' ==
  114) \
        && ('s' == 115) && ('t' == 116) && ('u' == 117) && ('v' ==
  118) \
        && ('w' == 119) && ('x' == 120) && ('y' == 121) && ('z' ==
  122) \
        && ('{' == 123) && ('|' == 124) && ('}' == 125) && ('~' ==
  126))
  #error "The character set is not based on ISO-646."
  printf("The character set is not based on ISO-646!\n");
  #endif
    return 0;
  }
  ==================End of tc.c=======================
  
  
  Preprocessing the source as C yields the expected results:
  $ xlC_r tc.c -E
  #line 1 "tc.c"
  int main()
  {
  #line 29
    return 0;
  }
  
  However, preprocessing the source as C++ yields conflicting
  results:
  $ xlC_r -+ tc.c -E
  #line 1 "tc.c"
  int main()
  {
  #line 27
  printf("The character set is not based on ISO-646!\n");
  
    return 0;
  }
  "tc.c", line 26.2: 1540-0859 (S) #error directive: "The
  character set is
  not based on ISO-646.".
  

Local fix

• n/a
  

Problem summary

• C++ programmers who use the compiler in
  preprocess-only mode may encounter this issue.
  
  The lexer fails to recognize escape
  sequences in preprocessor directives (#if, #elif), in
  preprocess-only mode.
  

Problem conclusion

• We process escape sequences at all times, if
  they are inside preprocessor directives.
  

Temporary fix

Comments

APAR Information

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

  IZ33740

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

  LI74401

Fix information

• Fixed component name

  XL C/C++ SLES10

• Fixed component ID

  5724U8300

Applicable component levels

• RA10 PSN IZ33740

     UP06/09/13