The page covering C++0x/C++11 support in GCC, ie. http://gcc.gnu.org/projects/cxx0x.html states that the "thread_local" keyword is supported since GCC 4.8.
However, thread_local is currently (gcc 4.8.2) too broken to be of real use: http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59364 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58672 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55800 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57163 Unless there are plans to fix it in gcc 4.8.3, I propose that thread_local be removed from the list of supported C++11 features, or at the very least changed to "partial". Having the feature as "supported" is plainly false advertising.