[Bug c++/82906] thread_local address not uniqued across shared libraries

["podbot88 at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82906

Anders <podbot88 at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |podbot88 at gmail dot com

--- Comment #3 from Anders <podbot88 at gmail dot com> ---
I have run into this problem while using https://github.com/ReactiveX/RxCpp.

When building test.o with clang, it works.

clang++ --std=c++14 -c -O2 -fPIC test.cpp
readelf -r test.o

Relocation section '.rela.text' at offset 0x170 contains 2 entries:
  Offset          Info           Type           Sym. Value    Sym. Name +
Addend
000000000005  000500000013 R_X86_64_TLSGD    0000000000000000 _ZZ3foovE1i - 4
00000000000d  000600000004 R_X86_64_PLT32    0000000000000000 __tls_get_addr -
4

Relocation section '.rela.eh_frame' at offset 0x1a0 contains 1 entries:
  Offset          Info           Type           Sym. Value    Sym. Name +
Addend
000000000020  000300000002 R_X86_64_PC32     0000000000000000 .text + 0

/usr/bin/g++-8 --std=c++14 -c -O2 -fPIC test.cpp
readelf -r test.o

Relocation section '.rela.text' at offset 0x268 contains 3 entries:
  Offset          Info           Type           Sym. Value    Sym. Name +
Addend
000000000007  000c00000014 R_X86_64_TLSLD    0000000000000000 _ZZ3foovE1i - 4
00000000000c  000d00000004 R_X86_64_PLT32    0000000000000000 __tls_get_addr -
4
000000000016  000c00000015 R_X86_64_DTPOFF32 0000000000000000 _ZZ3foovE1i + 0

Relocation section '.rela.eh_frame' at offset 0x2b0 contains 1 entries:
  Offset          Info           Type           Sym. Value    Sym. Name +
Addend
000000000020  000200000002 R_X86_64_PC32     0000000000000000 .text + 0


g++ test.o -shared -o test.so
test.so if test.o is build with clang. 
000000200fe0  000600000010 R_X86_64_DTPMOD64 0000000000000000 _ZZ3foovE1i + 0
000000200fe8  000600000011 R_X86_64_DTPOFF64 0000000000000000 _ZZ3foovE1i + 0

test.so if test.o is build with gcc.
000000200fc8  000000000010 R_X86_64_DTPMOD64                    0