From b2f7e0da082611e2fcea970f02b82fca80976ad6 Mon Sep 17 00:00:00 2001
From: Sergey Fedorov <barracuda@macos-powerpc.org>
Date: Tue, 30 Jul 2024 16:23:01 +0800
Subject: [PATCH] Fix build on macOS 10.15 and earlier

Closes: https://github.com/aws/s2n-tls/issues/4673
---
 tls/s2n_ktls_io.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git tls/s2n_ktls_io.c tls/s2n_ktls_io.c
index ad1d984c6..5ef776cf5 100644
--- tls/s2n_ktls_io.c
+++ tls/s2n_ktls_io.c
@@ -45,6 +45,16 @@
 #define S2N_MAX_STACK_IOVECS     16
 #define S2N_MAX_STACK_IOVECS_MEM (S2N_MAX_STACK_IOVECS * sizeof(struct iovec))
 
+#ifdef __APPLE__
+#include <AvailabilityMacros.h>
+#if MAC_OS_X_VERSION_MIN_REQUIRED < 110000
+#ifdef __DARWIN_ALIGN32
+#undef __DARWIN_ALIGN32
+#define __DARWIN_ALIGN32(p) ((__darwin_size_t)((__darwin_size_t)(p) + __DARWIN_ALIGNBYTES32) &~ __DARWIN_ALIGNBYTES32)
+#endif
+#endif
+#endif
+
 /* Used to override sendmsg and recvmsg for testing. */
 static ssize_t s2n_ktls_default_sendmsg(void *io_context, const struct msghdr *msg);
 static ssize_t s2n_ktls_default_recvmsg(void *io_context, struct msghdr *msg);