There is a non-standard compiler extension supporting them for GCC, but that's all. Also, I seriously hope they won't. The whole point of C in this day and age

There is a non-standard compiler extension supporting them for GCC, but that's all. Also, I seriously hope they won't. The whole point of C in this day and age is extreme simplicity and portability. The latest standard, C17, has only corrections. C11 has really all that's needed for "modern" applications, aka a threading library which is not pthreads and decent unicode support.