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

[howarth at nitro dot med.uc.edu]

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

--- Comment #11 from Jack Howarth <howarth at nitro dot med.uc.edu> 2012-01-28 16:49:14 UTC ---
Created attachment 26492
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=26492
diff of preprocessed source for 
libstdc++-v3/testsuite/30_threads/try_lock/3.cc generated with Xcode 4.2 on SL
and with Xcode 4.2.1 on Lion for 10.6 API.