Re: [PATCH v3] config/arm: update aarch32 build with gcc13

Re: [PATCH v3] config/arm: update aarch32 build with gcc13

[Thomas Monjalon]

01/11/2023 13:57, Paul Szczepanek:
> 
> On 25/10/2023 13:57, Juraj Linkeš wrote:
> > The aarch32 with gcc13 fails with:
> >
> > Compiler for C supports arguments -march=armv8-a: NO
> >
> > ../config/arm/meson.build:714:12: ERROR: Problem encountered: No
> > suitable armv8 march version found.
> >
> > This is because we test -march=armv8-a alone (without the -mpfu option),
> > which is no longer supported in gcc13 aarch32 builds.
> >
> > The most recent recommendation from the compiler team is to build with
> > -march=armv8-a+simd -mfpu=auto, which should work for compilers old and
> > new. The suggestion is to first check -march=armv8-a+simd and only then
> > check -mfpu=auto.
> >
> > To address this, add a way to force the architecture (the value of
> > the -march option).
> >
> > Signed-off-by: Juraj Linkeš <juraj.linkes@pantheon.tech>
> > ---
> >   config/arm/meson.build | 40 +++++++++++++++++++++++-----------------
> >   1 file changed, 23 insertions(+), 17 deletions(-)
> >
> > diff --git a/config/arm/meson.build b/config/arm/meson.build
> > index 3f22d8a2fc..c3f763764a 100644
> > --- a/config/arm/meson.build
> > +++ b/config/arm/meson.build
> > @@ -43,7 +43,9 @@ implementer_generic = {
> >           },
> >           'generic_aarch32': {
> >               'march': 'armv8-a',
> > -            'compiler_options': ['-mfpu=neon'],
> > +            'force_march': true,
> > +            'march_features': ['simd'],
> > +            'compiler_options': ['-mfpu=auto'],
> >               'flags': [
> >                   ['RTE_ARCH_ARM_NEON_MEMCPY', false],
> >                   ['RTE_ARCH_STRICT_ALIGN', true],
> > @@ -695,21 +697,25 @@ if update_flags
> >       # probe supported archs and their features
> >       candidate_march = ''
> >       if part_number_config.has_key('march')
> > -        supported_marchs = ['armv8.6-a', 'armv8.5-a', 'armv8.4-a', 'armv8.3-a',
> > -                            'armv8.2-a', 'armv8.1-a', 'armv8-a']
> > -        check_compiler_support = false
> > -        foreach supported_march: supported_marchs
> > -            if supported_march == part_number_config['march']
> > -                # start checking from this version downwards
> > -                check_compiler_support = true
> > -            endif
> > -            if (check_compiler_support and
> > -                cc.has_argument('-march=' + supported_march))
> > -                candidate_march = supported_march
> > -                # highest supported march version found
> > -                break
> > -            endif
> > -        endforeach
> > +        if part_number_config.get('force_march', false)
> > +            candidate_march = part_number_config['march']
> > +        else
> > +            supported_marchs = ['armv8.6-a', 'armv8.5-a', 'armv8.4-a', 'armv8.3-a',
> > +                                'armv8.2-a', 'armv8.1-a', 'armv8-a']
> > +            check_compiler_support = false
> > +            foreach supported_march: supported_marchs
> > +                if supported_march == part_number_config['march']
> > +                    # start checking from this version downwards
> > +                    check_compiler_support = true
> > +                endif
> > +                if (check_compiler_support and
> > +                    cc.has_argument('-march=' + supported_march))
> > +                    candidate_march = supported_march
> > +                    # highest supported march version found
> > +                    break
> > +                endif
> > +            endforeach
> > +        endif
> >           if candidate_march == ''
> >               error('No suitable armv8 march version found.')
> >           endif
> > @@ -741,7 +747,7 @@ if update_flags
> >       # apply supported compiler options
> >       if part_number_config.has_key('compiler_options')
> >           foreach flag: part_number_config['compiler_options']
> > -            if cc.has_argument(flag)
> > +            if cc.has_multi_arguments(machine_args + [flag])
> >                   machine_args += flag
> >               else
> >                   warning('Configuration compiler option ' +
> 
> 
> Reviewed-by: Paul Szczepanek <paul.szczepanek@arm.com>
> 
> 

Applied with Cc: stable@dpdk.org, thanks.