From e192cbb585d40e8d467a1f740504b5604a3101ea Mon Sep 17 00:00:00 2001
From: Vincent Bernat <vincent@bernat.im>
Date: Thu, 16 Jul 2015 20:52:51 +0200
Subject: [PATCH] BUILD: link with libdl if needed for Lua support

On platforms where the dl*() functions are not part of the libc, a
program linking Lua also needs to link to libdl.

Moreover, on platforms using a gold linker with the --as-needed flag,
the libdl library needs to be linked after linking Lua, otherwise, it
won't be marked as needed and will be discarded and its symbols won't be
present at the end of the linking phase.

Ubuntu enables the --as-needed flag by default. Other distributions may
advertise its use, like Gentoo.
---
 Makefile | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Makefile b/Makefile
index 6ab7d5469..a1383a38c 100644
--- a/Makefile
+++ b/Makefile
@@ -606,6 +606,9 @@ endif
 endif
 
 OPTIONS_LDFLAGS += $(LUA_LD_FLAGS) -l$(LUA_LIB_NAME) -lm
+ifneq ($(USE_DL),)
+OPTIONS_LDFLAGS += -ldl
+endif
 OPTIONS_OBJS    += src/hlua.o
 endif