From 4e7ebfac9a92a05236459fddb3a8e24ab0688317 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Stanis=C5=82aw=20Pitucha?= <git@viraptor.info>
Date: Thu, 29 Aug 2024 00:34:04 +1000
Subject: [PATCH] Add fdatasync declaration on darwin (#496)

---
 configure.ac | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index 4946008..879ad15 100644
--- a/configure.ac
+++ b/configure.ac
@@ -432,7 +432,15 @@ while : ; do
 	case ${file_sync} in
 	fdatasync)
 		test "x${ac_cv_func_fdatasync}" = "xno" || break
-		file_sync=fsync;;
+		file_sync=fsync
+
+		dnl Darwin provides the function but doesn't have it in headers
+		case "$host_os" in
+			darwin*)
+				AH_BOTTOM([int fdatasync(int fildes);])
+			;;
+                esac
+		;;
 	fsync)
 		test "x${ac_cv_func_fsync}" = "xno" || break
 		file_sync=;;