On 03/07/2013 08:31 PM, Jon Ciesla wrote:
On Thu, Mar 7, 2013 at 1:28 PM, Stephan Bergmann <sberg...@redhat.com
<mailto:sberg...@redhat.com>> wrote:

    Building LibreOffice for x86_64 starting to fail in an odd way
    recently,
    
<http://koji.fedoraproject.__org/koji/getfile?taskID=__5091173&name=build.log&offset=__-4000
    
<http://koji.fedoraproject.org/koji/getfile?taskID=5091173&name=build.log&offset=-4000>>,
    I stripped that down to what I would assume is a newly introduced
    bug in how ld resolves weak references?

    Given a test.s of

                 .text
                 .globl main
                 .type main, @function
        main:
                 .quad x
                 .weakref x,__pthread_key_create


    "gcc test.s" builds fine, while "gcc test.s -lcom_err", i.e.,
    including a reference to some .so that in turn needs libpthread,
    fails with

        /usr/bin/ld: /tmp/cckAPSW1.o: undefined reference to symbol
        '__pthread_key_create@@GLIBC___2.2.5'
        /usr/bin/ld: note: '__pthread_key_create@@GLIBC___2.2.5' is
        defined in DSO /lib64/libpthread.so.0 so try adding it to the
        linker command line
        /lib64/libpthread.so.0: could not read symbols: Invalid operation
        collect2: error: ld returned 1 exit status


    The same works fine in F-18.  The failing ld is "GNU ld version
    2.23.52.0.1-4.fc19 20130226."


I ran into this with kismet, adding an '-lpthread' at the right spot
fixed it.  I think it just got stricter again.

Just see this is a known problem already, <https://bugzilla.redhat.com/show_bug.cgi?id=918003> " New ld broke handling of undefined weak symbols" (and "adding an '-lpthread' at the right spot" just works around the symptoms).

Stephan
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