From: Lukas Schwaighofer <lukas@schwaighofer.name>
Date: Mon, 3 Dec 2018 22:45:44 +0100
Subject: Fix compatibility with new gnu-efi version

Allow multiple definitions when linking the syslinux binary so the
memset and memcpy symbols which are included by gnu-efi since 3.0.8 are
ignored (we still use the definitions from syslinux) but linking
succeeds.
---
 efi/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/efi/Makefile b/efi/Makefile
index f4501e7..0d1a673 100644
--- a/efi/Makefile
+++ b/efi/Makefile
@@ -71,7 +71,7 @@ $(OBJS): | $(OBJ)/$(ARCH)
 BTARGET  = syslinux.efi
 
 syslinux.so: $(OBJS) $(CORE_OBJS) $(LIB_OBJS)
-	$(LD) $(LDFLAGS) --strip-debug -o $@ $^ -lgnuefi -lefi
+	$(LD) $(LDFLAGS) -zmuldefs --strip-debug -o $@ $^ -lgnuefi -lefi
 
 # We need to rename the .hash section because the EFI firmware
 # linker really doesn't like it.