From b2c26315339fc17d0ad9d0009321671850cc7295 Mon Sep 17 00:00:00 2001
From: Yousong Zhou <yszhou4tech@gmail.com>
Date: Mon, 16 Mar 2020 15:18:16 +0800
Subject: [PATCH] datapath: unexport LDFLAGS

OpenWrt build system will put "-specs=.../hardened-pie-ld.specs" into
LDFLAGS when building PIE binaries.  However the "-specs" argument is
inteneded for "gcc" the driver while "ld" the linker when presented will
complain it as unrecognized error.

This can cause Kbuild error when building datapath kernel modules.  The
issue should only happen when compiling against upstream kernel 4.14 and
earlier.  Later ones should have been fixed with kernel upstream commit
d503ac531a5 ("kbuild: rename LDFLAGS to KBUILD_LDFLAGS")

Signed-off-by: Yousong Zhou <yszhou4tech@gmail.com>
---
 datapath/linux/Makefile.in | 1 +
 1 file changed, 1 insertion(+)

diff --git a/datapath/linux/Makefile.in b/datapath/linux/Makefile.in
index efc1663e4..61fcaa67e 100644
--- a/datapath/linux/Makefile.in
+++ b/datapath/linux/Makefile.in
@@ -1,5 +1,6 @@
 ifeq ($(KERNELRELEASE),)
 # We're being called directly by running make in this directory.
+unexport LDFLAGS
 include Makefile.main
 else
 # We're being included by the Linux kernel build system
