From bf697b900c06140a6ff6d00e22a812c46144bed1 Mon Sep 17 00:00:00 2001
From: Guillem Jover <guillem@hadrons.org>
Date: Tue, 22 May 2018 15:43:48 +0200
Subject: [PATCH] Add symbol redirection support

We need this to be able to select different version symbols at
compile-time.
---
 include/bsd/sys/cdefs.h | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/include/bsd/sys/cdefs.h b/include/bsd/sys/cdefs.h
index 98333d1..b5c8dad 100644
--- a/include/bsd/sys/cdefs.h
+++ b/include/bsd/sys/cdefs.h
@@ -76,6 +76,9 @@
 #define _SYS_CDEFS_H
 #endif
 
+#define LIBBSD_CONCAT(x, y)	x ## y
+#define LIBBSD_STRING(x)	#x
+
 #ifdef __GNUC__
 #define LIBBSD_GCC_VERSION (__GNUC__ << 8 | __GNUC_MINOR__)
 #else
@@ -90,6 +93,12 @@
 #define LIBBSD_DEPRECATED(x)
 #endif
 
+#if LIBBSD_GCC_VERSION >= 0x0200
+#define LIBBSD_REDIRECT(name, proto, alias) name proto __asm__(LIBBSD_ASMNAME(#alias))
+#endif
+#define LIBBSD_ASMNAME(cname) LIBBSD_ASMNAME_PREFIX(__USER_LABEL_PREFIX__, cname)
+#define LIBBSD_ASMNAME_PREFIX(prefix, cname) LIBBSD_STRING(prefix) cname
+
 #ifndef __dead2
 # if LIBBSD_GCC_VERSION >= 0x0207
 #  define __dead2 __attribute__((__noreturn__))