From 6655c39fd0e2a1b558786cace02d6d77a8a95cf1 Mon Sep 17 00:00:00 2001
From: Dan Kegel <dank@kegel.com>
Date: Sun, 3 Apr 2022 11:27:39 -0700
Subject: [PATCH] abicheck.sh: don't export CHOST if it wasn't already
 exported.

This fixes https://github.com/zlib-ng/zlib-ng/issues/1219,
a regression when running abicheck.sh with default compiler.
---
 test/abicheck.sh | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/test/abicheck.sh b/test/abicheck.sh
index 5b720acf..4267aff9 100755
--- a/test/abicheck.sh
+++ b/test/abicheck.sh
@@ -94,7 +94,11 @@ then
 fi
 
 # Canonicalize CHOST to work around bug in original zlib's configure
-export CHOST=$(sh $TESTDIR/../tools/config.sub $CHOST)
+# (Don't export it if it wasn't already exported, else may cause
+# default compiler detection failure and shared library link error
+# when building both zlib and zlib-ng.
+# See https://github.com/zlib-ng/zlib-ng/issues/1219)
+CHOST=$(sh $TESTDIR/../tools/config.sub $CHOST)
 
 if test "$CHOST" = ""
 then
-- 
2.47.2