net/thunderx: disable PMD for old compilers

Disable for gcc < 4.7 and icc <= 14.0

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 older compilers.

Signed-off-by: Ferruh Yigit <ferruh.yigit@intel.com>

drivers/net/Makefile

@@ -31,6 +31,11 @@
 
 include $(RTE_SDK)/mk/rte.vars.mk
 
+# set in mk/toolchain/xxx/rte.toolchain-compat.mk
+ifeq ($(CONFIG_RTE_LIBRTE_THUNDERX_NICVF_PMD),d)
+        $(warning thunderx pmd is not supported by old compilers)
+endif
+
 core-libs := librte_eal librte_mbuf librte_mempool librte_ring librte_ether
 core-libs += librte_net librte_kvargs
 

mk/toolchain/gcc/rte.toolchain-compat.mk

@@ -89,4 +89,9 @@ else
 	ifeq ($(shell test $(GCC_VERSION) -lt 42 && echo 1), 1)
 		MACHINE_CFLAGS := $(filter-out -march% -mtune% -msse%,$(MACHINE_CFLAGS))
 	endif
+
+	# Disable thunderx PMD for gcc < 4.7
+	ifeq ($(shell test $(GCC_VERSION) -lt 47 && echo 1), 1)
+		CONFIG_RTE_LIBRTE_THUNDERX_NICVF_PMD=d
+	endif
 endif

mk/toolchain/icc/rte.toolchain-compat.mk

@@ -72,4 +72,9 @@ else
 		# remove march options
 		MACHINE_CFLAGS := $(patsubst -march=%,-xSSE3,$(MACHINE_CFLAGS))
 	endif
+
+	# Disable thunderx PMD for icc <= 14.0
+	ifeq ($(shell test $(ICC_MAJOR_VERSION) -le 14 && echo 1), 1)
+		CONFIG_RTE_LIBRTE_THUNDERX_NICVF_PMD=d
+	endif
 endif