AIX Open Source

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  • 1.  Questions about libstdc++.a for gcc

    Posted Fri October 28, 2022 02:17 AM

    We tried to compile official protobuf example on AIX7.1 with gcc8, the protobuf uses pthread and we encountered missing symbol problem

    $ ./add_person_cpp
exec(): 0509-036 Cannot load program add_person_cpp because of the following errors:
        0509-130 Symbol resolution failed for /opt/freeware/lib64/libprotobuf.a[libprotobuf.so.30] because:
        0509-136   Symbol _ZSt11__once_call (number 10) is not exported from
                   dependent module /opt/freeware/lib64/libstdc++.a[libstdc++.so.6].
        0509-136   Symbol _ZSt15__once_callable (number 11) is not exported from
                   dependent module /opt/freeware/lib64/libstdc++.a[libstdc++.so.6].
        0509-136   Symbol __once_proxy (number 21) is not exported from
                   dependent module /opt/freeware/lib64/libstdc++.a[libstdc++.so.6].
        0509-192 Examine .loader section symbols with the
                 'dump -Tv' command.


    We have checked the libstdc++.a and found there are two libstdc++.a in the lib/gcc/powerpc-ibm-aix*/ directory

    $ ls -ls /opt/freeware/lib64/libstdc++.a
   0 lrwxrwxrwx    1 root     system           53 Sep 01 15:10 /opt/freeware/lib64/libstdc++.a@ -> ../lib/gcc/powerpc-ibm-aix7.1.0.0/8/ppc64/libstdc++.a*


    This problem could be solved by providing another pthread library with LIBPATH

    $ LIBPATH=/opt/freeware/lib/gcc/powerpc-ibm-aix7.1.0.0/8/pthread ./add_person_cpp
Usage:  ./add_person_cpp ADDRESS_BOOK_FILE


    We are curious that "Is it safe to use the pthread/libstdc++.a to replace the original ppc64/libstdc++.a in /opt/freeware/lib64?"



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    yy
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  • 2.  RE: Questions about libstdc++.a for gcc

    Posted Fri October 28, 2022 02:40 AM
    It's not a good thing to replace the libraries. 
    You need to hack the -blibpath to make sure "/opt/freeware/lib/pthread" is set in the libpath of the protobuf libraries.
    You can take a look at the Toolbox protobuf spec file --> https://public.dhe.ibm.com/aix/freeSoftware/aixtoolbox/SPECS/protobuf-3.19.4-1.spec

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    Ayappan P
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    Original Message


  • 3.  RE: Questions about libstdc++.a for gcc

    Posted Fri October 28, 2022 03:23 AM
    We tried -blibpath and it works. Thank you.

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    yy
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    Original Message


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