From 549b877275d9104cc313a0b714548b58cb3fdd69 Mon Sep 17 00:00:00 2001
From: Lawrence D'Anna <lawrence_danna@apple.com>
Date: Thu, 9 Jul 2020 20:12:58 -0700
Subject: only trust ffi_closure_alloc on arm

---
 c/_cffi_backend.c | 2 +-
 setup.py          | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/c/_cffi_backend.c b/c/_cffi_backend.c
index 5c5fe45..ed89753 100644
--- a/c/_cffi_backend.c
+++ b/c/_cffi_backend.c
@@ -84,7 +84,7 @@
  * known that on the NetBSD kernel, a different strategy is used which
  * should not be open to the fork() bug.
  */
-#ifdef __NetBSD__
+#if defined(__NetBSD__) || (CFFI_LIBFFI_FROM_MACOS && (defined(__arm__) || defined(__arm64__)))
 # define CFFI_TRUST_LIBFFI
 #endif
 
diff --git a/setup.py b/setup.py
index fc8d705..217504a 100644
--- a/setup.py
+++ b/setup.py
@@ -152,7 +152,7 @@ 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_LIBFFI_FROM_MACOS', '1'),
                           ('HAVE_FFI_PREP_CIF_VAR', '1')]
         libraries += ['ffi']
     else:
-- 
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