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Support HTTP/2 on static curl-sys on MacOS. - #237
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Ever since rust started using static builds (rust-lang/rust#54919), HTTP/2 hasn't been working on MacOS. The static feature is using the darwinssl backend, which looks like it needs a define to enable some conditional logic to enable ALPN to detect if HTTP/2 is available.
I have no idea if this is safe/wise, but in limited testing on my 10.14 system it seems to work. IIUC, rustc builds on 10.13, so I think these should still apply there. I think
__builtin_availablewas introduced in Xcode 9, but I'm not sure.