From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ferruh Yigit <ferruh.yigit@intel.com>
Subject: [PATCH 1/3] net/thunderx: disable pmd for gcc < 4.7
Date: Thu,  6 Apr 2017 13:14:26 +0100
Message-ID: <20170406121428.16883-1-ferruh.yigit@intel.com>
Cc: dev@dpdk.org,
	Ferruh Yigit <ferruh.yigit@intel.com>
To: Jerin Jacob <jerin.jacob@caviumnetworks.com>,
 Bruce Richardson <bruce.richardson@intel.com>,
 Harry van Haaren <harry.van.haaren@intel.com>,
 Thomas Monjalon <thomas.monjalon@6wind.com>
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PMD uses some compiler builtins and new compiler options. Tested with
gcc 4.5.1 and following were not supported:

option:
-Ofast

macros:
_Static_assert

__ORDER_LITTLE_ENDIAN__
__ORDER_BIG_ENDIAN__
__BYTE_ORDER__

__atomic_fetch_add
__ATOMIC_ACQUIRE
__atomic_load_n
__ATOMIC_RELAXED
__atomic_store_n
__ATOMIC_RELEASE

It is not easy to fix all in PMD, disabling PMD for gcc version < 4.7

Signed-off-by: Ferruh Yigit <ferruh.yigit@intel.com>
---
 drivers/net/thunderx/Makefile | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/net/thunderx/Makefile b/drivers/net/thunderx/Makefile
index 706250b..0b9f0a2 100644
--- a/drivers/net/thunderx/Makefile
+++ b/drivers/net/thunderx/Makefile
@@ -62,6 +62,14 @@ SRCS-$(CONFIG_RTE_LIBRTE_THUNDERX_NICVF_PMD) += nicvf_svf.c
 
 ifeq ($(CONFIG_RTE_TOOLCHAIN_GCC),y)
 CFLAGS_nicvf_rxtx.o += -fno-prefetch-loop-arrays
+
+# Disable PMD for gcc < 4.7
+ifeq ($(shell test $(GCC_VERSION) -lt 47 && echo 1), 1)
+$(warning thunderx pmd not supported by gcc < 4.7)
+LIB = 
+SRC-y = 
+endif
+
 endif
 CFLAGS_nicvf_rxtx.o += -Ofast
 
-- 
2.9.3