From b283ce78b5287f502b3204c51f8ec69be54c79db Mon Sep 17 00:00:00 2001
From: Lei Qiao <qiaol618@gmail.com>
Date: Tue, 23 Feb 2021 11:34:07 +0800
Subject: [PATCH] make remove_trailing_whitespace() works in both MAC OS and
 Linux system

---
 contrib/utilities/indent_common.sh | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/contrib/utilities/indent_common.sh b/contrib/utilities/indent_common.sh
index 52071b0bac..bddad8366a 100644
--- a/contrib/utilities/indent_common.sh
+++ b/contrib/utilities/indent_common.sh
@@ -171,7 +171,11 @@ remove_trailing_whitespace()
   file="${1}"
   tmpfile="$(mktemp "${TMPDIR}/$(basename "$1").tmp.XXXXXXXX")"
 
-  sed 's/\s\+$//g' "${file}" > "${tmpfile}"
+  #
+  # Mac OS uses BSD sed (other than GNU sed in Linux),
+  # so it doesn't recognize \s as 'spaces' or + as 'one or more'.
+  #
+  sed 's/[[:space:]]\{1,\}$//g' "${file}" > "${tmpfile}"
   if ! diff -q "${file}" "${tmpfile}" >/dev/null; then
     mv "${tmpfile}" "${file}"
   fi
-- 
2.39.5