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From eefd95b37e1042992cb07bec1ac3f6dbe199d8f0 Mon Sep 17 00:00:00 2001
From: Haruue Icymoon <i@haruue.moe>
Date: Fri, 22 Nov 2019 16:58:59 +0800
Subject: [PATCH] erofs-utils: fix configure.ac

./configure will fail when --with-lz4-libdir is not set, since
$with_lz4_libdir will be an empty string and generate an empty -L
into LDFLAGS. This patch fixes it.

Link: https://lore.kernel.org/r/20191122085859.GA2414688@usamimi.host.haruue.net
Signed-off-by: Haruue Icymoon <i@haruue.moe>
Fixes: d51c2d043773 ("erofs-utils: introduce lz4/lz4hc compression algorithm")
Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
---
 configure.ac | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index f925358..870dfb9 100644
--- a/configure.ac
+++ b/configure.ac
@@ -174,7 +174,7 @@ if test "x$enable_lz4" = "xyes"; then
 
   if test "x${have_lz4h}" = "xyes" ; then
     saved_LDFLAGS=${LDFLAGS}
-    LDFLAGS="-L$with_lz4_libdir ${LDFLAGS}"
+    test -z "${with_lz4_libdir}" || LDFLAGS="-L$with_lz4_libdir ${LDFLAGS}"
     AC_CHECK_LIB(lz4, LZ4_compress_destSize, [
       have_lz4="yes"
       have_lz4hc="yes"
-- 
2.20.1