On 9/3/2021 12:53 AM, David Christensen wrote:
> 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
>
> Signed-off-by: David Christensen <d...@linux.vnet.ibm.com>
> ---
> v2:
> - update copyright year
> - rebase for 21.11-rc0
> ---
> config/ppc/meson.build | 7 +++++++
> 1 file changed, 7 insertions(+)
>
> diff --git a/config/ppc/meson.build b/config/ppc/meson.build
> index adf49e1f42..5354db4e0a 100644
> --- 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 <bl...@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 +18,12 @@ 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
> --
I am getting following build error in my environment:
"config/ppc/meson.build:23:6: ERROR: Unknown statement."
The compiler I have is:
powerpc64le-linux-gcc (gcc 10.2.0 "powerpc64le-linux-gcc.br_real (Buildroot
2020.08-14-ge5a2a90) 10.2.0")
meson version: Version: 0.59.1
Multi-line statements seems need to be merged with '\':
diff --git a/config/ppc/meson.build b/config/ppc/meson.build
index 0b1948fc7cb9..f95009c77e7a 100644
--- a/config/ppc/meson.build
+++ b/config/ppc/meson.build
@@ -20,7 +20,7 @@ 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
+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
