[Bug gold/16728] New: gold fails to hide hidden tls symbols

[maillist-gdb at barfooze dot de]

https://sourceware.org/bugzilla/show_bug.cgi?id=16728

            Bug ID: 16728
           Summary: gold fails to hide hidden tls symbols
           Product: binutils
           Version: 2.24
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gold
          Assignee: ian at airs dot com
          Reporter: maillist-gdb at barfooze dot de
                CC: ccoutant at google dot com

firefox 27.0.1 fails to build with gold.

Error relocating
/src/build/firefox/mozilla-release/firefox-build-dir/dist/bin/libxul.so:
gTLSThreadID: symbol not found

readelf output:
000001fbc4e0  029300000010 R_X86_64_DTPMOD64 0000000000000000 gTLSThreadID + 0
000001fbc4e8  029300000011 R_X86_64_DTPOFF64 0000000000000000 gTLSThreadID + 0
659: 0000000000000000     4 TLS     LOCAL  HIDDEN    17 gTLSThreadID@@xul27

with ld.bfd, grepping for gTLSThreadID returns nothing.

minimal testcase dso_tls_hidden.cc:
#pragma GCC visibility push(hidden)
__thread int foo;
#pragma GCC visibility pop
int bar() { return foo == 1; }

$ g++ -fPIC -shared dso_tls_hidden.cc -o libfoo.so
$ readelf -a libfoo.so  | grep foo
000000001b80  000900000010 R_X86_64_DTPMOD64 0000000000000000 foo + 0
000000001b88  000900000011 R_X86_64_DTPOFF64 0000000000000000 foo + 0
     9: 0000000000000000     4 TLS     LOCAL  HIDDEN    15 foo
    21: 0000000000000000     4 TLS     LOCAL  HIDDEN    15 foo
  000000: Rev: 1  Flags: BASE   Index: 1  Cnt: 1  Name: libfoo.so

with ld.bfd:
$ g++ -fPIC -shared dso_tls_hidden.cc -o libfoo.so
$ readelf -a libfoo.so  | grep foo
    44: 0000000000000000     4 TLS     LOCAL  DEFAULT   14 foo

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