From f37e5bf24540ff3435734df8100416f404422662 Mon Sep 17 00:00:00 2001
From: Rob Landley <rob@landley.net>
Date: Mon, 16 Aug 2021 03:06:08 -0500
Subject: [PATCH] People still using Centos 7 asked for some bug workarounds.

---
 scripts/make.sh | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/scripts/make.sh b/scripts/make.sh
index 1aecaec4..8534ae9e 100755
--- a/scripts/make.sh
+++ b/scripts/make.sh
@@ -14,6 +14,9 @@ if [ ! -z "$ASAN" ]; then
   export ASAN_OPTIONS="detect_leaks=0"
 fi
 
+# Centos 7 bug workaround, EOL June 30 2024.
+unset DASHN; wait -n 2>/dev/null; [ $? -eq 2 ] || DASHN=-n
+
 export LANG=c
 export LC_ALL=C
 set -o pipefail
@@ -302,14 +305,14 @@ do
   do_loudly $BUILD -c $i -o $OUT &
 
   # ratelimit to $CPUS many parallel jobs, detecting errors
-  [ $((++COUNT)) -ge $CPUS ] && { wait -n; DONE=$?; : $((--COUNT)); }
+  [ $((++COUNT)) -ge $CPUS ] && { wait $DASHN; DONE=$?; : $((--COUNT)); }
   [ $DONE -ne 0 ] && break
 done
 # wait for all background jobs, detecting errors
 
 while [ $((COUNT--)) -gt 0 ]
 do
-  wait -n;
+  wait $DASHN;
   DONE=$((DONE+$?))
 done
 [ $DONE -ne 0 ] && exit 1
-- 
2.39.2