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configure: check for __builtin_available() availability (#1788)

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This change does two things:
1. It un-breaks the build in Xcode 9.0. (Xcode 9.0 is currently
   failing trying to compile connectx() in lib/connect.c.)
2. It finally weak-links the connectx() function, and falls back on
   connect() when run on older operating systems.
This commit is contained in:
Nick Zitzmann 2017-08-16 12:24:39 -05:00 • committed by GitHub
parent ca9630f128
commit 870d849d48
3 changed files with 45 additions and 9 deletions
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26
acinclude.m4 Normal file → Executable file
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@ -3243,3 +3243,29 @@ AC_DEFUN([CURL_MAC_CFLAGS], [
fi
])
dnl CURL_SUPPORTS_BUILTIN_AVAILABLE
dnl
dnl Check to see if the compiler supports __builtin_available. This built-in
dnl compiler function first appeared in Apple LLVM 9.0.0. It's so new that, at
dnl the time this macro was written, the function was not yet documented. Its
dnl purpose is to return true if the code is running under a certain OS version
dnl or later.
AC_DEFUN([CURL_SUPPORTS_BUILTIN_AVAILABLE], [
AC_MSG_CHECKING([to see if the compiler supports __builtin_available()])
AC_COMPILE_IFELSE([
AC_LANG_PROGRAM([[
#include <stdlib.h>
]],[[
if (__builtin_available(macOS 10.8, iOS 5.0, *)) {}
]])
],[
AC_MSG_RESULT([yes])
AC_DEFINE_UNQUOTED(HAVE_BUILTIN_AVAILABLE, 1,
[Define to 1 if you have the __builtin_available function.])
],[
AC_MSG_RESULT([no])
])
])