From 343628d8c0f1848b968930f6dbabdd1174404b14 Mon Sep 17 00:00:00 2001
From: Maria Matejka <mq@ucw.cz>
Date: Fri, 20 Jan 2023 14:07:38 +0100
Subject: Fixed various build problems on FreeBSD and/or CLang

---
 lib/birdlib.h | 9 +++++++++
 1 file changed, 9 insertions(+)

(limited to 'lib/birdlib.h')

diff --git a/lib/birdlib.h b/lib/birdlib.h
index d743ecdf..5ecd19ca 100644
--- a/lib/birdlib.h
+++ b/lib/birdlib.h
@@ -9,13 +9,22 @@
 #ifndef _BIRD_BIRDLIB_H_
 #define _BIRD_BIRDLIB_H_
 
+#include <stddef.h>
+
 #include "sysdep/config.h"
 #include "lib/alloca.h"
 
 /* Ugly structure offset handling macros */
 
 #define SAME_TYPE(a, b)	({ int _ = ((a) != (b)); !_; })
+#define TYPE_CAST(from, to, what) ( SAME_TYPE(((from) NULL), (what)), ((to) (what)))
+
+#ifdef offsetof
+#define OFFSETOF offsetof
+#else
 #define OFFSETOF(s, i) ((size_t) &((s *)0)->i)
+#endif
+
 #define SKIP_BACK(s, i, p) ({ s *_ptr = ((s *)((char *)p - OFFSETOF(s, i))); SAME_TYPE(&_ptr->i, p); _ptr; })
 #define BIRD_ALIGN(s, a) (((s)+a-1)&~(a-1))
 #define CPU_STRUCT_ALIGN  (MAX_(_Alignof(void*), _Alignof(u64)))
-- 
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