linux-kernel - [PATCH] ipv6: Provide definitions for GNU libc 2.8 and later

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Date:	Fri, 23 Jan 2015 08:46:12 +0100
From:	Thierry Reding <thierry.reding@...il.com>
To:	"David S. Miller" <davem@...emloft.net>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-api@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] ipv6: Provide definitions for GNU libc 2.8 and later

From: Thierry Reding <treding@...dia.com>

Starting with GNU libc 2.8 and later, the definitions of the in6_pktinfo
and ip6_mtuinfo structures is guarded by __USE_GNU. Make sure to provide
the structures in the linux/ipv6.h when building against GNU libc 2.8 or
later and __USE_GNU is undefined to avoid breaking build issues.

One example where such failure to build can be observed is dhcpcd 6.6.7.

Signed-off-by: Thierry Reding <treding@...dia.com>
---
This is based on next-20150122.

 include/uapi/linux/libc-compat.h | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/include/uapi/linux/libc-compat.h b/include/uapi/linux/libc-compat.h
index fa673e9cc040..40bd54df06e3 100644
--- a/include/uapi/linux/libc-compat.h
+++ b/include/uapi/linux/libc-compat.h
@@ -70,8 +70,17 @@
 #define __UAPI_DEF_IPV6_MREQ		0
 #define __UAPI_DEF_IPPROTO_V6		0
 #define __UAPI_DEF_IPV6_OPTIONS		0
+/*
+ * The GNU C library 2.8 and later define the in6_pktinfo and ip6_mtuinfo
+ * structures only for __USE_GNU.
+ */
+#if __GLIBC_PREREQ(2, 8) && !defined(__USE_GNU)
+#define __UAPI_DEF_IN6_PKTINFO		1
+#define __UAPI_DEF_IP6_MTUINFO		1
+#else
 #define __UAPI_DEF_IN6_PKTINFO		0
 #define __UAPI_DEF_IP6_MTUINFO		0
+#endif
 
 #else
 
-- 
2.1.3

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