[dpdk-dev] [PATCH v3 03/12] eal/build: add libatomic dependency for 32-bit clang

[Phil Yang]

> -----Original Message-----
> From: dev <dev-bounces at dpdk.org> On Behalf Of Phil Yang
> Sent: Tuesday, March 17, 2020 9:18 AM
> To: thomas at monjalon.net; harry.van.haaren at intel.com;
> konstantin.ananyev at intel.com; stephen at networkplumber.org;
> maxime.coquelin at redhat.com; dev at dpdk.org
> Cc: david.marchand at redhat.com; jerinj at marvell.com;
> hemant.agrawal at nxp.com; Honnappa Nagarahalli
> <Honnappa.Nagarahalli at arm.com>; Gavin Hu <Gavin.Hu at arm.com>;
> Ruifeng Wang <Ruifeng.Wang at arm.com>; Joyce Kong
> <Joyce.Kong at arm.com>; nd <nd at arm.com>
> Subject: [dpdk-dev] [PATCH v3 03/12] eal/build: add libatomic dependency
> for 32-bit clang
> 
> When compiling with clang on 32-bit platforms, we are missing copies
> of 64-bit atomic functions. We can solve this by linking against
> libatomic for the drivers and libs which need those atomic ops.
> 
> Signed-off-by: Phil Yang <phil.yang at arm.com>
> Reviewed-by: Ruifeng Wang <ruifeng.wang at arm.com>
> Reviewed-by: Gavin Hu <gavin.hu at arm.com>
> ---
>  lib/librte_eal/meson.build | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/lib/librte_eal/meson.build b/lib/librte_eal/meson.build
> index 4be5118..3b10eae 100644
> --- a/lib/librte_eal/meson.build
> +++ b/lib/librte_eal/meson.build
> @@ -20,6 +20,12 @@ endif
>  if cc.has_function('getentropy', prefix : '#include <unistd.h>')
>  	cflags += '-DRTE_LIBEAL_USE_GETENTROPY'
>  endif
> +
> +# for clang 32-bit compiles we need libatomic for 64-bit atomic ops
> +if cc.get_id() == 'clang' and dpdk_conf.get('RTE_ARCH_64') == false
> +    ext_deps += cc.find_library('atomic')
> +endif
> +

This should be unneeded since:
https://git.dpdk.org/dpdk/commit/?id=da4eae278b56e698c64d0c39939a7a55c5b6abdd

Thanks,
Phil Yang

>  sources = common_sources + env_sources
>  objs = common_objs + env_objs
>  headers = common_headers + env_headers
> --
> 2.7.4