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

[Development of GNU's TLS library]

Daiki Ueno started a new discussion on configure.ac: https://gitlab.com/gnutls/gnutls/-/merge_requests/1294#note_369325885

>  
>  fi
>  
> +AC_MSG_CHECKING([whether the compiler supports __builtin_available()])
> +AC_COMPILE_IFELSE([
> +  AC_LANG_PROGRAM([[
> +#include <stdlib.h>
> +  ]],[[
> +    if (__builtin_available(macOS 10.8, iOS 5.0, *)) {}

Can't this be done sorely in the C file, with `#if has_builtin(__builtin_available)`?

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