[Bug other/39888] TLS emutls not linked to automatically on Darwin

["mrs at apple dot com" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #8 from mrs at apple dot com  2009-09-22 21:17 -------
I meant the idea that libSystem has new symbols in it is relevant only to
darwin10.  The system libgcc_s is present on older OSes, so those aspects are
still relevant.  Yeah, to solve that problem one would either have to have a
new name, or possibly an explicit path.  I've not tried the later, but it might
offer a way to construct the library with fewer mods.

from darwin10:
$ nm /usr/lib/libgcc_s.1.dylib | grep Unwind_Bac
0019f9c6 S $ld$hide$os10.4$__Unwind_Backtrace
0019f9c7 S $ld$hide$os10.5$__Unwind_Backtrace
00163b30 T __Unwind_Backtrace
$ nm /usr/lib/libSystem.dylib | grep Unwind_Bac
0019f9c6 S $ld$hide$os10.4$__Unwind_Backtrace
0019f9c7 S $ld$hide$os10.5$__Unwind_Backtrace
00163b30 T __Unwind_Backtrace

also note, there is add as well as hide;

$ nm /usr/lib/libgcc_s.10.5.dylib | grep Unwind_Back
00000f0a S $ld$add$os10.4$__Unwind_Backtrace
00000f0b S $ld$add$os10.5$__Unwind_Backtrace

As for what functions (symbols), well, the ones in common between
libSystem/libgcc_s on the system and libgcc from gcc.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39888