@available() and compiler black/white listing?

[René J . V . Bertin]

Hi,

I just spent a considerable time finding all `if (@available(macOS 10_14, *))` 
statements in the VLC code, and wrapping them with conditional tags.

If memory serves me well, clang 5.0 and newer should accept that syntax. What 
clang versions could I blacklist in the Portfile so that this code will build 
on older systems like 10.11 ... or is it bound to fail anyway because the 
compiler will still choke on the code inside the @available() statement?

Thanks,
R.