IBM Support

IV10153: UNRESOLVED SYMBOL ERRORS WITH -QIPA

Fixes are available

January 2012 PTF for XL C for AIX, V11.1
January 2012 PTF for XL C/C++ for AIX, V11.1
April 2012 PTF for XL C for AIX, V11.1
April 2012 PTF for XL C/C++ for AIX, V11.1
July 2012 PTF for XL C/C++ for AIX, V11.1
October 2012 PTF for XL C/C++ for AIX, V11.1
October 2012 PTF for XL C for AIX, V11.1
February 2013 PTF for XL C for AIX, V11.1
February 2013 PTF for XL C/C++ for AIX, V11.1
XL C/C++ for AIX Fix Pack 14 (May 2013 PTF) for 11.1
XL C for AIX Fix Pack 14 (May 2013 PTF) for 11.1
XL C/C++ for AIX Fix Pack 15 (August 2013 PTF) for 11.1
XL C for AIX Fix Pack 15 (August 2013 PTF) for 11.1
XL C/C++ for AIX Fix Pack 16 (November 2013 PTF) for 11.1
XL C for AIX Fix Pack 17 (February 2014 PTF) for 11.1
XL C/C++ for AIX Fix Pack 17 (February 2014 PTF) for 11.1
XL C/C++ for AIX Fix Pack 18 (May 2014 PTF) for 11.1
XL C/C++ for AIX Fix Pack 19 (August 2014 PTF) for 11.1
XL C/C++ for AIX Fix Pack 20 (November 2014 PTF) for 11.1
XL C for AIX Fix Pack 21 (April 2015 PTF) for 11.1
XL C/C++ for AIX Fix Pack 21 (April 2015 PTF) for 11.1
XL C/C++ for AIX Fix Pack 22 (September 2015 PTF) for 11.1
XL C for AIX Fix Pack 23 (March 2016 PTF) for 11.1
XL C/C++ for AIX Fix Pack 23 (March 2016 PTF) for 11.1
XL C for AIX Fix Pack 24 (September 2016 PTF) for 11.1
XL C/C++ for AIX Fix Pack 24 (September 2016 PTF) for 11.1
July 2012 PTF for XL C for AIX, V11.1
XL C for AIX Fix Pack 16 (November 2013 PTF) for 11.1
XL C for AIX Fix Pack 18 (May 2014 PTF) for 11.1
XL C for AIX Fix Pack 19 (August 2014 PTF) for 11.1
XL C for AIX Fix Pack 20 (November 2014 PTF) for 11.1
XL C for AIX Fix Pack 22 (September 2015 PTF) for 11.1

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APAR status

  • Closed as program error.

Error description

  • When compiling the following test case with -qipa, the IPA
    linker complains about type mis-matches when it should not:
    
    ===== TESTCASE:
    $cat main.c
    
    struct A {
      int a,b,c;
    };
    
    extern struct A a;
    
    int foo(), foo2();
    
    int main() {
    
      a.a=1;
      foo();
    }
    $
    
    $cat test1.c
    
    
    struct A {
      int a,b,c;
    };
    
     struct A  *a;
    
    int foo() {
      return 1;
    }
    
    int* bat() {
      return &a->a;
    }
    $
    
    
    
    ===== ACTUAL OUTPUT:
    $xlc -+ -q64 -qipa -c main.c
    test1.c
    main.c:
    test1.c:
    $ar -X64 r libtest.a main.o test1.o
    ar: Creating an archive file libtest.a.
    $xlc -q64 -qipa libtest.a
    1586-281 (E) A type mismatch was detected for symbol "a".
    1586-107 (S) An error was encountered during object information
    processing.
    1586-206 (S) Unresolved reference to symbol "a".
    1586-204 (S) Unresolved references to objects are detected.
    1586-341 (U) Code generation was not performed due to previously
    detected errors. Object file not created.
    $
    
    
    ====== EXPECTED OUTPUT:
    $xlc -+ -q64 -c main.c test1.c
    main.c:
    test1.c:
    $ar -X64 r libtest.a main.o test1.o
    ar: Creating an archive file libtest.a.
    xlc -q64 libtest.a
    

Local fix

  • n/a
    

Problem summary

  • USERS AFFECTED:
    Anyone using IPA Level 1 or higher that has exception handling
    code could theorectically run into this
    
    PROBLEM DESCRIPTION:
    The problem is that when the IPA linker finds a mismatch
    reference or definition, it just ignores it.
    If the mismatch happens to be the only definition for the
    symbol, it will treat the symbol as undefined and issue an
    error.
    
    The system linker behavior is to only fail to link under
    -qextchk.
    

Problem conclusion

  • The IPA linker has been changed to conform with what the system
    linker does when -qextchk is not specified, ie accept the
    mismatch if its the only definition for the symbol.
    

Temporary fix

Comments

APAR Information

  • APAR number

    IV10153

  • Reported component name

    XL C/C++ AIX

  • Reported component ID

    5724X1300

  • Reported release

    B10

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2011-11-03

  • Closed date

    2012-01-10

  • Last modified date

    2012-01-10

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

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

    LI76644

Fix information

  • Fixed component name

    XL C FOR AIX

  • Fixed component ID

    5724X1200

Applicable component levels



Document information

More support for: XL C for AIX

Software version: 11.1

Reference #: IV10153

Modified date: 10 January 2012