[Bug ld/19553] New: linking against libs that require pthreads breaks due to symbol changes

[vapier at gentoo dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=19553

            Bug ID: 19553
           Summary: linking against libs that require pthreads breaks due
                    to symbol changes
           Product: binutils
           Version: 2.26
            Status: NEW
          Severity: normal
          Priority: P2
         Component: ld
          Assignee: hjl.tools at gmail dot com
          Reporter: vapier at gentoo dot org
        Depends on: 18720
  Target Milestone: ---
            Target: x86_64-linux-gnu

after the change for bug 18720 landed, trying to use libs that use pthreads
under glibc fails when the main app itself doesn't use pthreads.

example:
$ echo 'main() { fork(); }' > test.c
$ gcc test.c -fsanitize=address
ld: /usr/lib/gcc/x86_64-pc-linux-gnu/5.3.0/libasan.so: undefined reference to
symbol 'address@hidden'
/lib64/libpthread.so.0: error adding symbols: DSO missing from command line
collect2: error: ld returned 1 exit status

this is a regression wrt binutils 2.25.


Referenced Bugs:

https://sourceware.org/bugzilla/show_bug.cgi?id=18720
[Bug 18720] No symbol version section for versioned symbol address@hidden'
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