IBM Support

IV09519: UNRESOLVED SYMBOL ERROR WITH -QIPA=LEVEL=0

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

  • Clients who list duplicate libraries on their link line more
    than once and link with -qipa may observe unresolved symbol
    errors at link time.
    
    eg:
    $xlC_r -O2 -q64 -L. -o abc abc.o -la -lb -lc -lb -la
    -qipa=level=0 -qinline=noauto -qipa=relink
    .
    .
    d: 0711-317 ERROR: Undefined symbol:
    .A2i::Utf8::GraphemeReference::Compare(const
    A2i::Utf8::GraphemeReference&) const
    ld: 0711-317 ERROR: Undefined symbol:
    .A2i::Genrl::Msrmnt::operator==(const
    A2i::Genrl::Msrmnt::MeasurementInfo&,const
    A2i::Genrl::Msrmnt::MeasurementInfo&)
    ld: 0711-317 ERROR: Undefined symbol:
    .A2i::Protocol::BidirectionalBlockHeader::BidirectionalBlockHead
    er()
    $
    

Local fix

  • As a workaround to avoid this problem, remove all the duplicate
    library entries from the link line.
    

Problem summary

  • USERS AFFECTED:
    Users of TPO with -O4 and above may be affected by this issue.
    
    PROBLEM DESCRIPTION:
    The compiler tries to avoid putting archives which are
    completely IPA
    enabled on the linker command line because all the functions
    from them will now
    be in object files for partitions at the end of IPA link. If an
    archive has any non-IPA stuff it must be on the command line.
    So at the start of IPA link, we process all object files
    including archives.
    They go into a table. In the case for this APAR, there will be
    more than one entry in the table
    for the ones that are duplicated on the command line.
    Then as we read in the object files out of the libraries we
    flag entries
    in the table as to whether they are all IPA or have some
    non-IPA members.
    Then at link edit time right before we call the linker we
    bypass the ones
    that are IPA only. However the thing that flags them only looks
    down to the first entry for
    the containing library; and we bypass that one correctly.
    But the later entries are still in that table and they are not
    bypassed.
    They never had any flags set so they get added to the command
    line to the linker which causes
    the unresolved symbols at link time.
    

Problem conclusion

  • The fix is to make a pass over the table and mark duplicate
    entries the same as the first one so the correct bypassing will
    work.
    

Temporary fix

Comments

APAR Information

  • APAR number

    IV09519

  • 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

    2011-10-21

  • 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:

    LI76666

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 #: IV09519

Modified date: 10 January 2012