[Bug libstdc++/51906] thread lock test failures on darwin11 under Xcode 4.2

[iains at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51906

--- Comment #19 from Iain Sandoe <iains at gcc dot gnu.org> 2012-01-29 15:37:45 UTC ---
could you also let me know what the value of 
HAVE_AS_TLS
is in gcc/auto-host.h