[PATCH v2] eal: introduce atomics abstraction

[Tyler Retzlaff]

On Thu, Feb 09, 2023 at 12:53:41PM +0000, Ferruh Yigit wrote:
> On 2/9/2023 9:04 AM, Bruce Richardson wrote:
> > On Wed, Feb 08, 2023 at 01:43:38PM -0800, Tyler Retzlaff wrote:
> >> Introduce atomics abstraction that permits optional use of standard C11
> >> atomics when meson is provided the new enable_stdatomics=true option.
> >>
> >> Signed-off-by: Tyler Retzlaff <roretzla at linux.microsoft.com>
> >> ---
> >>  config/meson.build                     | 11 ++++
> >>  lib/eal/arm/include/rte_atomic_32.h    |  6 ++-
> >>  lib/eal/arm/include/rte_atomic_64.h    |  6 ++-
> >>  lib/eal/include/generic/rte_atomic.h   | 96 +++++++++++++++++++++++++++++++++-
> >>  lib/eal/loongarch/include/rte_atomic.h |  6 ++-
> >>  lib/eal/ppc/include/rte_atomic.h       |  6 ++-
> >>  lib/eal/riscv/include/rte_atomic.h     |  6 ++-
> >>  lib/eal/x86/include/rte_atomic.h       |  8 ++-
> >>  meson_options.txt                      |  2 +
> >>  9 files changed, 139 insertions(+), 8 deletions(-)
> >>
> >> diff --git a/config/meson.build b/config/meson.build
> >> index 26f3168..25dd628 100644
> >> --- a/config/meson.build
> >> +++ b/config/meson.build
> >> @@ -255,6 +255,17 @@ endif
> >>  # add -include rte_config to cflags
> >>  add_project_arguments('-include', 'rte_config.h', language: 'c')
> >>  
> >> +stdc_atomics_enabled = get_option('enable_stdatomics')
> >> +dpdk_conf.set('RTE_STDC_ATOMICS', stdc_atomics_enabled)
> >> +
> >> +if stdc_atomics_enabled
> >> +if cc.get_id() == 'gcc' or cc.get_id() == 'clang'
> >> +    add_project_arguments('-std=gnu11', language: 'c')
> > 
> > Is there a reason for using gnu11 on gcc and clang, rather than limiting
> > ourselves to proper c11 support?
> > 
> 
> +1 to stick to c11 standard instead of relying compiler extensions

the extensions are already in use. enabling -std=c11 causes warnings
about the extensions to start being emitted.

but since i feel encouraged here, i think i will interpret your request
as let's limit the scope of enablement of extensions to where they are
already used instead of enabling them over the whole build.

i will submit a new revision patch to get rid of -std=gnu11 here.

thanks!