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.

diff --git a/test/abicheck.sh b/test/abicheck.sh
index 5b720acfe736a9314893bb306a10372d74abaa5c..4267aff97d9da7d95471da2332e8167052c18a7c 100755 (executable)
--- 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