Adding CC: Jason
--nX
On Tue, Jun 13, 2023 at 3:20 PM Daniel Vacek <neelx@xxxxxxxxxx> wrote:
>
> Our customer reported the below warning whe using Clang v16.0.4 and C++20,
> on a code that includes the header "/usr/include/infiniband/verbs.h":
>
> error: bitwise operation between different enumeration types ('ibv_access_flags' and
> 'ib_uverbs_access_flags') is deprecated [-Werror,-Wdeprecated-enum-enum-conversion]
> mem->mr = ibv_reg_mr(dev->pd, (void*)start, len, IBV_ACCESS_LOCAL_WRITE);
> ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> /usr/include/infiniband/verbs.h:2514:19: note: expanded from macro 'ibv_reg_mr'
> ((access) & IBV_ACCESS_OPTIONAL_RANGE) == 0))
> ~~~~~~~~ ^ ~~~~~~~~~~~~~~~~~~~~~~~~~
> 1 error generated.
>
> According to the article "Clang 11 warning: Bitwise operation between different
> enumeration types is deprecated":
>
> C++20's P1120R0 deprecated bitwise operations between different enums. Such code is
> likely to become ill-formed in C++23. Clang 11 warns about such cases. It should be fixed.
>
> Reported-by: Rogerio Moraes <rogerio@xxxxxxxxxxx>
> Signed-off-by: Daniel Vacek <neelx@xxxxxxxxxx>
> ---
> libibverbs/verbs.h | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/libibverbs/verbs.h b/libibverbs/verbs.h
> index 03a7a2a7..ed9aed21 100644
> --- a/libibverbs/verbs.h
> +++ b/libibverbs/verbs.h
> @@ -2590,7 +2590,7 @@ __ibv_reg_mr(struct ibv_pd *pd, void *addr, size_t length, unsigned int access,
> #define ibv_reg_mr(pd, addr, length, access) \
> __ibv_reg_mr(pd, addr, length, access, \
> __builtin_constant_p( \
> - ((access) & IBV_ACCESS_OPTIONAL_RANGE) == 0))
> + ((int)(access) & IBV_ACCESS_OPTIONAL_RANGE) == 0))
>
> /**
> * ibv_reg_mr_iova - Register a memory region with a virtual offset
> --
> 2.40.1
>
