From 6684336eafc9aafebbccb8f48c3b82cc913b3aa8 Mon Sep 17 00:00:00 2001
From: Lawrence D'Anna <lawrence_danna@apple.com>
Date: Thu, 9 Jul 2020 18:39:23 -0700
Subject: MacOS 11, arm64, ffi_prep_cif_var On Apple arm64, theABI for a
 variardic function is different than the ABI for a fixed-arg function, even
 of the same arg types.

In order to account for this, CFFI must call ffi_prep_cif_var for
variardic calls.

see: https://developer.apple.com/library/archive/documentation/Xcode/Conceptual/iPhoneOSABIReference/Articles/ARM64FunctionCallingConventions.html
---
 setup.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'setup.py')

diff --git a/setup.py b/setup.py
index c28147e..fc8d705 100644
--- a/setup.py
+++ b/setup.py
@@ -152,7 +152,8 @@ else:
     if 'darwin' in sys.platform and macosx_deployment_target() >= (10, 15):
         # use libffi from Mac OS SDK
         extra_compile_args += ['-iwithsysroot/usr/include/ffi']
-        define_macros += [('CFFI_TRUST_LIBFFI', '1')]
+        define_macros += [('CFFI_TRUST_LIBFFI', '1'),
+                          ('HAVE_FFI_PREP_CIF_VAR', '1')]
         libraries += ['ffi']
     else:
         use_pkg_config()
-- 
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