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From: Daniel Mrzyglod <danielx.t.mrzyglod@intel.com>
To: dev@dpdk.org
Subject: [dpdk-dev] [PATCH] net: fix build with gcc 4.4.7 and strict aliasing
Date: Tue, 24 Nov 2015 16:12:39 +0100	[thread overview]
Message-ID: <1448377959-4440-1-git-send-email-danielx.t.mrzyglod@intel.com> (raw)

This is fix for GCC 4.4.7.
flag "-fstrict-aliasing" is default for optimalisation above -O0.

Fixes: 2b039d5f20a3 ("net: fix build with gcc 4.4.7 and strict aliasing")

Signed-off-by: Daniel Mrzyglod <danielx.t.mrzyglod@intel.com>
---
 lib/librte_net/rte_ip.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/librte_net/rte_ip.h b/lib/librte_net/rte_ip.h
index 71c519a..5b7554a 100644
--- a/lib/librte_net/rte_ip.h
+++ b/lib/librte_net/rte_ip.h
@@ -169,7 +169,8 @@ __rte_raw_cksum(const void *buf, size_t len, uint32_t sum)
 {
 	/* workaround gcc strict-aliasing warning */
 	uintptr_t ptr = (uintptr_t)buf;
-	const uint16_t *u16 = (const uint16_t *)ptr;
+	typedef uint16_t __attribute__((__may_alias__)) u16_p;
+	const u16_p *u16 = (const u16_p *)ptr;
 
 	while (len >= (sizeof(*u16) * 4)) {
 		sum += u16[0];
-- 
2.5.0

             reply	other threads:[~2015-11-24 15:13 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-11-24 15:12 Daniel Mrzyglod [this message]
2015-11-24 15:47 ` Mrzyglod, DanielX T
2015-11-24 15:49   ` Bruce Richardson
2015-11-24 16:31 ` [dpdk-dev] [PATCH v2] " Daniel Mrzyglod
2015-11-24 16:31   ` Daniel Mrzyglod
2015-11-24 17:58     ` Ananyev, Konstantin
2015-11-25 17:06       ` Mrzyglod, DanielX T
2015-11-25 17:13         ` Ananyev, Konstantin
2015-11-24 22:42   ` Stephen Hemminger
2015-11-25 18:00 ` [dpdk-dev] [PATCH] " Ananyev, Konstantin
2015-11-25 20:58   ` Thomas Monjalon

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