File 0006-bcache-tools-list.h-only-define-offsetof-when-it-is-.patch of Package bcache-tools

From 1129319af1cb5ec0cd38b283a4a3d14e55d616c7 Mon Sep 17 00:00:00 2001
From: Coly Li <colyli@suse.de>
Date: Sun, 16 Aug 2020 23:57:56 +0800
Subject: [PATCH 06/17] bcache-tools: list.h: only define offsetof() when it is
 undefined
Git-commit: 1129319af1cb5ec0cd38b283a4a3d14e55d616c7
Patch-mainline: bcache-tools-1.1
References: jsc#SLE-9807

For new gcc headers, offsetof() is defined, the definition in list.h
will be warned as redefined.

This patch checks whether offsetof() is defined, and only defines local
version of offsetof() when it is not defined by gcc headers.

Signed-off-by: Coly Li <colyli@suse.de>
---
 list.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/list.h b/list.h
index 55d2bb4..458281d 100644
--- a/list.h
+++ b/list.h
@@ -25,10 +25,12 @@
  */
 /*@{*/
 
+#ifndef offsetof
 /**
  * Get offset of a member
  */
 #define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
+#endif /* offsetof*/
 
 /**
  * Casts a member of a structure out to the containing structure
-- 
2.26.2