eal/ppc: ignore GCC 10 stringop-overflow warnings

[ upstream commit c13e617 ]

Suppress gcc warning "warning: writing 16 bytes into a region of
size 0" for users of the POWER rte_memcpy() function.  Existing
rte_memcpy() code takes different code paths based on the actual
size of the move so the warning is already addressed. See also
commit b5b3ea8 ("eal/x86: ignore gcc 10 stringop-overflow warnings")

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

lib/librte_eal/common/include/arch/ppc_64/rte_memcpy.h

@@ -1,6 +1,6 @@
 /*
  * SPDX-License-Identifier: BSD-3-Clause
- * Copyright (C) IBM Corporation 2014.
+ * Copyright (C) IBM Corporation 2014,2021
  */
 
 #ifndef _RTE_MEMCPY_PPC_64_H_
@@ -19,11 +19,16 @@ extern "C" {
 
 #include "generic/rte_memcpy.h"
 
-#if (GCC_VERSION >= 90000 && GCC_VERSION < 90400)
+#if defined(RTE_TOOLCHAIN_GCC) && (GCC_VERSION >= 90000)
 #pragma GCC diagnostic push
 #pragma GCC diagnostic ignored "-Warray-bounds"
 #endif
 
+#if defined(RTE_TOOLCHAIN_GCC) && (GCC_VERSION >= 100000)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wstringop-overflow"
+#endif
+
 static inline void
 rte_mov16(uint8_t *dst, const uint8_t *src)
 {
@@ -199,7 +204,11 @@ rte_memcpy_func(void *dst, const void *src, size_t n)
 	return ret;
 }
 
-#if (GCC_VERSION >= 90000 && GCC_VERSION < 90400)
+#if defined(RTE_TOOLCHAIN_GCC) && (GCC_VERSION >= 100000)
+#pragma GCC diagnostic pop
+#endif
+
+#if defined(RTE_TOOLCHAIN_GCC) && (GCC_VERSION >= 90000)
 #pragma GCC diagnostic pop
 #endif