[Bug gold/20805] gcc's ThreadSanitizer broken by gold

[ccoutant at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=20805

Cary Coutant <ccoutant at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |ASSIGNED
   Last reconfirmed|                            |2016-11-15
     Ever confirmed|0                           |1

--- Comment #4 from Cary Coutant <ccoutant at gmail dot com> ---
Your testcase is not using the initial-exec model:

     e4a:       66 48 8d 3d 00 00 00    data16 lea 0x0(%rip),%rdi        # e52
<_ZN6__tsan10InitializeEPNS_11ThreadStateE+0x32>
     e51:       00 
                        e4e: R_X86_64_TLSGD    
_ZN6__tsan22cur_thread_placeholderE-0x4
     e52:       66 66 48 e8 00 00 00    data16 data16 callq e5a
<_ZN6__tsan10InitializeEPNS_11ThreadStateE+0x3a>
     e59:       00 
                        e56: R_X86_64_PLT32     __tls_get_addr-0x4

Gold does not optimize any TLS references when building a shared library.

In this case, where cur_thread_placeholder has hidden visibility, I think we
should be able to optimize it down to IE, as ld.bfd does.

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