eal/ppc: fix build with gcc 9.3

Building DPDK on Ubuntu 20.04 with GCC 9.3.0 results in a "subscript is
outside array bounds" message in rte_memcpy function.  The build error
is caused by an interaction between __builtin_constant_p and
"-Werror=array-bounds" as described in this bugzilla:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90387

Modify the code to disable the array-bounds check for GCC versions 9.0
to 9.3.

Cc: stable@dpdk.org
Signed-off-by: David Christensen <drc@linux.vnet.ibm.com>

diff --git a/lib/librte_eal/ppc/include/rte_memcpy.h b/lib/librte_eal/ppc/include/rte_memcpy.h
index d685b7b..c2a1f35 100644 (file)
--- a/lib/librte_eal/ppc/include/rte_memcpy.h
+++ b/lib/librte_eal/ppc/include/rte_memcpy.h
@@ -10,6 +10,7 @@
 #include <string.h>
 
 #include "rte_altivec.h"
+#include "rte_common.h"
 
 #ifdef __cplusplus
 extern "C" {
@@ -17,6 +18,11 @@ extern "C" {
 
 #include "generic/rte_memcpy.h"
 
+#if (GCC_VERSION >= 90000 && GCC_VERSION < 90400)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Warray-bounds"
+#endif
+
 static inline void
 rte_mov16(uint8_t *dst, const uint8_t *src)
 {
@@ -192,6 +198,10 @@ rte_memcpy_func(void *dst, const void *src, size_t n)
        return ret;
 }
 
+#if (GCC_VERSION >= 90000 && GCC_VERSION < 90400)
+#pragma GCC diagnostic pop
+#endif
+
 #ifdef __cplusplus
 }
 #endif