1a69af6d38
Till now the use of __atomic_* gcc builtins required gcc >= 4.7. Since some supported and quite common operating systems like CentOS 6 still come with older versions (4.4) and the mapping to the older builtins is reasonably simple, let's implement it. This code is only used for gcc < 4.7. It has been quickly tested on a machine using gcc 4.4.4 and provided expected results. This patch should be backported to 1.8.