From 7d9d4266292d22f73c41ec5c73b6eab4f810f400 Mon Sep 17 00:00:00 2001
From: Michael Davidsaver <mdavidsaver@gmail.com>
Date: Sat, 7 Nov 2020 08:13:47 -0800
Subject: [PATCH] avoid empty EXTRA*

Helpful when the value of EXTRA can be conditionally
computed, but unset is not an easy option.
eg. with github actions
---
 cue.py | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/cue.py b/cue.py
index ed58f56..f1fe12f 100644
--- a/cue.py
+++ b/cue.py
@@ -715,8 +715,9 @@ def setup_for_build(args):
 
     # Add EXTRA make arguments
     for tag in ['EXTRA', 'EXTRA1', 'EXTRA2', 'EXTRA3', 'EXTRA4', 'EXTRA5']:
-        if tag in os.environ:
-            extra_makeargs.append(os.environ[tag])
+        val = os.environ.get(tag, "")
+        if len(val)>0:
+            extra_makeargs.append(val)
 
 
 def fix_etc_hosts():