http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60932
--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Sebastian Huber from comment #2)
> So I cannot use C libraries using atomics with C++ on GCC targets? With
> FreeBSD and clang this works fine.
Until the c++ front-end implements _Atomic keyword, that is correct.
You could exactly what FreeBSD does (but take into account gcc 4.9 c front end
implementing _Atomic):
271 #if !__has_extension(c_atomic) && !__has_extension(cxx_atomic)
272 /*
273 * No native support for _Atomic(). Place object in structure to prevent
274 * most forms of direct non-atomic access.
275 */
276 #define _Atomic(T) struct { T volatile __val; }
277 #endif
But this is not correct and in most cases broken. You could also just use c++11
atomic header.
