[dpdk-dev] [PATCH v2 12/13] ethdev: fix C++ errors in flow API (MPLS, GRE)

[Shahaf Shuler]

Tuesday, April 25, 2017 11:30 AM, Adrien Mazarguil:
> This commit addresses the following compilation errors:
> 
>  In file included from build/include/rte_flow_driver.h:50:0,
>                   from /tmp/check-includes.sh.1397.cc:1:
>  build/include/rte_flow.h:631:1: error: C99 designator 'label_tc_s' outside
>     aggregate initializer
>  [...]
>  build/include/rte_flow.h:631:1: error: initializer-string for array of
>     chars is too long [-fpermissive]
>  [...]
>  build/include/rte_flow.h:650:1: sorry, unimplemented: non-trivial
>     designated initializers not supported  [...]
> 
> C++ does not support the C99-style designated initializers used in this
> file for the default item masks. While the resulting symbols are primarily
> useful to PMDs (written in C), they are exposed as part of the public API for
> documentation purposes and to assist application writers.
> 
> Considering that:
> 
> - using pre-C99 initialization style for compatibility with C++ would
>   render them difficult to understand (all struct members must be
>   initialized)
> - using both initialization styles would be needlessly verbose
> - not exposing them at all would defeat their purpose
> - applications do not normally need these symbols at run time
> 
> This commit hides these symbols from C++ applications. Specific C++
> initializers will be added later if necessary.
> 
> Fixes: 7cd048321d1d ("ethdev: add MPLS and GRE flow API items")
> 
> Signed-off-by: Adrien Mazarguil <adrien.mazarguil at 6wind.com>
> Acked-by: Beilei Xing <beilei.xing at intel.com>
Acked-by: Shahaf Shuler <shahafs at mellanox.com>
> ---
>  lib/librte_ether/rte_flow.h | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/lib/librte_ether/rte_flow.h b/lib/librte_ether/rte_flow.h index
> bc7bc45..abd4c6a 100644
> --- a/lib/librte_ether/rte_flow.h
> +++ b/lib/librte_ether/rte_flow.h
> @@ -652,9 +652,11 @@ struct rte_flow_item_mpls {  };
> 
>  /** Default mask for RTE_FLOW_ITEM_TYPE_MPLS. */
> +#ifndef __cplusplus
>  static const struct rte_flow_item_mpls rte_flow_item_mpls_mask = {
>  	.label_tc_s = "\xff\xff\xf0",
>  };
> +#endif
> 
>  /**
>   * RTE_FLOW_ITEM_TYPE_GRE.
> @@ -671,9 +673,11 @@ struct rte_flow_item_gre {  };
> 
>  /** Default mask for RTE_FLOW_ITEM_TYPE_GRE. */
> +#ifndef __cplusplus
>  static const struct rte_flow_item_gre rte_flow_item_gre_mask = {
>  	.protocol = 0xffff,
>  };
> +#endif
> 
>  /**
>   * Matching pattern item definition.
> --
> 2.1.4