Looking at this blog post [1] even the support for C99 in VS2013 is limited. I don't know if tor hit the limitations, that's for you to decide.
C99 is 15 years old ... It should be "sane" to use it.
[1] https://blogs.msdn.com/b/vcblog/archive/2013/07/19/c99-library-support-in-vi...