[gnutls-devel] GnuTLS | Detect the availability of connectx at runtime (!1294)

[Development of GNU's TLS library]

Steve Lhomme created a merge request: https://gitlab.com/gnutls/gnutls/-/merge_requests/1294

Project:Branches: robUx4/gnutls:macos-connectx to gnutls/gnutls:master
Author:    Steve Lhomme



connectx is only available since macOS 10.11. So when compiling with a lower minimum SDK the compiler issues this error:

```
system/fastopen.c:134:9: error: 'connectx' is only available on macOS 10.11 or newer [-Werror,-Wunguarded-availability]
                ret = connectx(fd, &endpoints, SAE_ASSOCID_ANY, CONNECT_RESUME_ON_READ_WRITE | CONNECT_DATA_IDEMPOTENT, NULL, 0, NULL, NULL);
                      ^~~~~~~~
/Applications/Xcode9.2.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.13.sdk/usr/include/sys/socket.h:713:5: note: 'connectx' has been marked as being introduced in macOS 10.11 here, but the deployment target is macOS 10.7.0
```

With macOS compilers it's possible to detect at runtime whether an API call is present or not using `__builtin_available()`. So we check at runtime for connectx and use it only when available. So the same code compiled running on 10.10 will not use it and fallback to the regular `connect()` call. The code running on 10.11+ will use `connectx` as expected.

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