From 6ec71f56d035208cb7ae63c822969551ba22c081 Mon Sep 17 00:00:00 2001
From: Andrew Johnson <anj@aps.anl.gov>
Date: Tue, 26 Oct 2010 14:56:42 -0500
Subject: [PATCH] configure: Use := variable to set EPICS_HOST_ARCH if
 undefined.

Performance on Cygwin when using ?= is glacial...
---
 configure/CONFIG | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/configure/CONFIG b/configure/CONFIG
index 9f56fbbfb..1b3664bfd 100644
--- a/configure/CONFIG
+++ b/configure/CONFIG
@@ -25,8 +25,11 @@ else
 CONFIG ?= $(EPICS_BASE)/configure
 endif
 
-#
-EPICS_HOST_ARCH ?= $(shell $(CONFIG)/../startup/EpicsHostArch.pl)
+# Provide a default if the user hasn't set EPICS_HOST_ARCH
+ifeq ($(origin EPICS_HOST_ARCH), undefined)
+# NB: Must use a simply expanded variable here for performance:
+EPICS_HOST_ARCH := $(shell $(CONFIG)/../startup/EpicsHostArch.pl)
+endif
 #
 
 -include $(CONFIG)/os/CONFIG_COMPAT