[dpdk-dev] [PATCH v2] ppc64: fix compilation of when AltiVec is enabled

[Christian Ehrhardt]

On Thu, Aug 30, 2018 at 1:55 PM Christian Ehrhardt <
christian.ehrhardt at canonical.com> wrote:

> The definition of almost any newer standard like --stc=c11 will drop
> __APPLCE_ALTIVEC__ which otherwise would be defined.
> If that is the case then altivec.h will redefine bool to a type
> conflicting with those defined by stdbool.h.
>
> This breaks compilation of 18.08 on ppc64 like:
>   mlx5_nl_flow.c:407:17: error: incompatible types when assigning
>   to type ‘__vector __bool int’ {aka ‘__vector(4) __bool int’}
>   from type ‘int’ in_port_id_set = false;
>
> Other alternatives were pursued on [1] but they always ended up being
> more complex than what would be appropriate for the issue we face.
>
> [1]: http://mails.dpdk.org/archives/dev/2018-August/109926.html
>
> Tested-by: Takeshi T Yoshimura <TYOS at jp.ibm.com>
> Reviewed-by: Adrien Mazarguil adrien.mazarguil at 6wind.com


After more of a decade of submitting patches I should get an email right :-/
Well V3 it will be ...


> Signed-off-by: Christian Ehrhardt <christian.ehrhardt at canonical.com>
> ---
>  .../common/include/arch/ppc_64/rte_memcpy.h           | 11 +++++++++++
>  1 file changed, 11 insertions(+)
>
> diff --git a/lib/librte_eal/common/include/arch/ppc_64/rte_memcpy.h
> b/lib/librte_eal/common/include/arch/ppc_64/rte_memcpy.h
> index 75f74897b..0b3b89b56 100644
> --- a/lib/librte_eal/common/include/arch/ppc_64/rte_memcpy.h
> +++ b/lib/librte_eal/common/include/arch/ppc_64/rte_memcpy.h
> @@ -37,6 +37,17 @@
>  #include <string.h>
>  /*To include altivec.h, GCC version must  >= 4.8 */
>  #include <altivec.h>
> +/*
> + * Compilation workaround for PPC64 targets when AltiVec is fully
> + * enabled e.g. with std=c11. Otherwise there would be a type conflict
> + * of "bool" between stdbool and altivec.
> + */
> +#if defined(__PPC64__) && !defined(__APPLE_ALTIVEC__)
> + #undef bool
> + /* redefine as in stdbool.h */
> + #define bool _Bool
> +#endif
> +
>
>  #ifdef __cplusplus
>  extern "C" {
> --
> 2.17.1
>
>

-- 
Christian Ehrhardt
Software Engineer, Ubuntu Server
Canonical Ltd