config/arm: fix SVE build with GCC 8.3

If the target machine has SVE feature (e.g. "-march=armv8.2-a+sve'),
and the compiler is gcc-8.3, it will produce this error:
	In file included from lib/eal/common/eal_common_options.c:38:
	lib/eal/arm/include/rte_vect.h:13:10: fatal	error:
	arm_sve.h: No such file or directory
	#include <arm_sve.h>
	       ^~~~~~~~~~~

The root cause is that gcc-8.3 supports SVE (the macro
__ARM_FEATURE_SVE was 1), but it doesn't support SVE ACLE [1].

The solution:
a) Detect compiler whether support SVE ACLE, if support then define
RTE_HAS_SVE_ACLE macro.
b) Use the RTE_HAS_SVE_ACLE macro to include SVE header file.

[1] ACLE:  Arm C Language Extensions, the SVE ACLE header file is
<arm_sve.h>, user should include it when writing ACLE SVE code.

Fixes: 67b6882 ("lpm/arm: support SVE")
Cc: [email protected]

Signed-off-by: Chengwen Feng <[email protected]>
Acked-by: Ruifeng Wang <[email protected]>
Signed-off-by: Thomas Monjalon <[email protected]>

Author: fengchengwen

config/arm/meson.build

@@ -524,6 +524,9 @@ endif
 
 if cc.get_define('__ARM_FEATURE_SVE', args: machine_args) != ''
     compile_time_cpuflags += ['RTE_CPUFLAG_SVE']
+    if (cc.check_header('arm_sve.h'))
+        dpdk_conf.set('RTE_HAS_SVE_ACLE', 1)
+    endif
 endif
 
 if cc.get_define('__ARM_FEATURE_CRC32', args: machine_args) != ''

lib/eal/arm/include/rte_vect.h

@@ -9,7 +9,7 @@
 #include "generic/rte_vect.h"
 #include "rte_debug.h"
 #include "arm_neon.h"
-#ifdef __ARM_FEATURE_SVE
+#ifdef RTE_HAS_SVE_ACLE
 #include <arm_sve.h>
 #endif
 

lib/lpm/rte_lpm.h

@@ -402,7 +402,7 @@ rte_lpm_lookupx4(const struct rte_lpm *lpm, xmm_t ip, uint32_t hop[4],
 	uint32_t defv);
 
 #if defined(RTE_ARCH_ARM)
-#ifdef __ARM_FEATURE_SVE
+#ifdef RTE_HAS_SVE_ACLE
 #include "rte_lpm_sve.h"
 #else
 #include "rte_lpm_neon.h"