[dpdk-dev] [PATCH] net: fix build with gcc 4.4.7 and strict aliasing
Daniel Mrzyglod
danielx.t.mrzyglod at intel.com
Tue Nov 24 16:12:39 CET 2015
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 at 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
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