config/ppc: ignore GCC 11 psabi warnings

Suppress the gcc warning "note: the layout of aggregates containing
vectors with 4-byte alignment has changed in GCC 5" on POWER systems
by setting "-Wno-psabi".  Warning was originally added to gcc in
commit https://gcc.gnu.org/git/gitweb.cgi?p=gcc.git;h=9832651 to warn
of the vector alignment changes introduced in GCC 5.  Older gcc
versions forced vector alignment to 16 bytes due to requirements for
POWER 6 and earlier CPUs, but these restrictions don't apply to CPUs
supported by DPDK.

Bugzilla ID: 739
Cc: stable@dpdk.org
Signed-off-by: David Christensen <drc@linux.vnet.ibm.com>

diff --git a/config/ppc/meson.build b/config/ppc/meson.build
index adf49e1f42f35027f43fda8b09d73ee30b9e9d81..0b1948fc7cb933a6045dd9a957ba826fb99799cf 100644 (file)
--- a/config/ppc/meson.build
+++ b/config/ppc/meson.build
@@ -1,5 +1,6 @@
 # SPDX-License-Identifier: BSD-3-Clause
 # Copyright(c) 2018 Luca Boccassi <bluca@debian.org>
+# Copyright(c) 2021 IBM Corporation
 
 if not dpdk_conf.get('RTE_ARCH_64')
     error('Only 64-bit compiles are supported for this platform type')
@@ -17,6 +18,13 @@ if not power9_supported
     dpdk_conf.set('RTE_MACHINE','power8')
 endif
 
+# Suppress the gcc warning "note: the layout of aggregates containing
+# vectors with 4-byte alignment has changed in GCC 5".
+if cc.get_id() == 'gcc' and cc.version().version_compare('>=10.0') and
+        cc.version().version_compare('<12.0') and cc.has_argument('-Wno-psabi')
+    add_project_arguments('-Wno-psabi', language: 'c')
+endif
+
 # Certain POWER9 systems can scale as high as 1536 LCORES, but setting such a
 # high value can waste memory, cause timeouts in time limited autotests, and is
 # unlikely to be used in many production situations.  Similarly, keeping the