[Bug nptl/20452] New: Addition of sysdep.o to libpthread.a breaks relinking libpthread.a

["fweimer at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=20452

            Bug ID: 20452
           Summary: Addition of sysdep.o to libpthread.a breaks relinking
                    libpthread.a
           Product: glibc
           Version: 2.24
            Status: NEW
          Severity: normal
          Priority: P2
         Component: nptl
          Assignee: fweimer at redhat dot com
          Reporter: fweimer at redhat dot com
                CC: drepper.fsp at gmail dot com
  Target Milestone: ---
             Flags: security-

Some glibc downstreams relink libpthread.a into a single object file, to
support applications which use weak symbol references to detect if libpthread
has been linked into a process.

The addition of sysdep.o in this commit:

commit fb1cf108115f7e2e4510859693431b3473657d77
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Tue Oct 13 11:58:53 2015 -0700

    Add INLINE_SYSCALL_ERROR_RETURN_VALUE

breaks this relinking step because both libc.a and the combined libpthread .o
file define __syscall_error.

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