From 4ed5e9a5ffa01b00de6b06694c84b122c8f90aa9 Mon Sep 17 00:00:00 2001
From: Lars Brinkhoff <lars@nocrew.org>
Date: Wed, 26 Feb 2020 08:05:24 +0100
Subject: [PATCH] KLH10 workaround for console I/O problem.

On some hardware and/or software, console I/O will sometimes hang.
This is documented in a KLH10 makefile, with a workaround:

# This is a known problem on some Linux systems with high performance
# hardware.  As far as I know, Ken has not found a fix for it.
#
# The workaround is to rebuild klh10 with a special configuration that
# avoids the esoteric real-time-interrupt mechanisms.
---
 .cirrus.yml | 1 +
 Makefile    | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/.cirrus.yml b/.cirrus.yml
index 43b7d26d..3384f9c6 100644
--- a/.cirrus.yml
+++ b/.cirrus.yml
@@ -2,6 +2,7 @@ env:
   CIRRUS_CLONE_DEPTH: 1
   ARCH: amd64
   BASICS: yes
+  CONFFLAGS_USR: -DKLH10_CTYIO_INT=0
 
 task:
   freebsd_instance:
diff --git a/Makefile b/Makefile
index b4a966f3..84604563 100644
--- a/Makefile
+++ b/Makefile
@@ -229,7 +229,7 @@ $(KLH10):
 	./autogen.sh; \
 	$(MKDIR) tmp; \
 	cd tmp; \
-	export CONFFLAGS_USR=-DKLH10_DEV_DPTM03=0; \
+	export CONFFLAGS_USR="-DKLH10_DEV_DPTM03=0 $$CONFFLAGS_USR"; \
 	../configure --enable-lights --bindir="$(CURDIR)/build/klh10"; \
 	$(MAKE) -C bld-ks-its; \
 	$(MAKE) -C bld-ks-its install