[dpdk-dev] warnings when including DPDK headers from a C++17 source file

Stephen Hemminger stephen at networkplumber.org
Fri Jul 13 17:52:05 CEST 2018


On Fri, 13 Jul 2018 13:51:21 +0000
"Montorsi, Francesco" <fmontorsi at empirix.com> wrote:

> Hi all,
> 
> 
> I just noticed that, because of the removal of the "register" keyword in C++17, when I compile my DPDK-enabled code with -std=c++17 I get the following:
> 
> 
> 
> In file included from ../../../Third-Party/cpp-libs/dpdk/include/rte_ether.h:53:0,
>                  from ../../../Third-Party/cpp-libs/dpdk/include/rte_ethdev.h:186,
>                  from HwEmulCaptureDPDK.cpp:43:
> ../../../Third-Party/cpp-libs/dpdk/include/rte_byteorder.h: In function 'uint16_t rte_arch_bswap16(uint16_t)':
> ../../../Third-Party/cpp-libs/dpdk/include/rte_byteorder.h:57:20: warning: ISO C++1z does not allow 'register' storage class specifier [-Wregister]
>   register uint16_t x = _x;
>                     ^
> ../../../Third-Party/cpp-libs/dpdk/include/rte_byteorder.h: In function 'uint32_t rte_arch_bswap32(uint32_t)':
> ../../../Third-Party/cpp-libs/dpdk/include/rte_byteorder.h:72:20: warning: ISO C++1z does not allow 'register' storage class specifier [-Wregister]
>   register uint32_t x = _x;
>                     ^
> In file included from ../../../Third-Party/cpp-libs/dpdk/include/rte_byteorder.h:121:0,
>                  from ../../../Third-Party/cpp-libs/dpdk/include/rte_ether.h:53,
>                  from ../../../Third-Party/cpp-libs/dpdk/include/rte_ethdev.h:186,
>                  from HwEmulCaptureDPDK.cpp:43:
> ../../../Third-Party/cpp-libs/dpdk/include/rte_byteorder_64.h: In function 'uint64_t rte_arch_bswap64(uint64_t)':
> ../../../Third-Party/cpp-libs/dpdk/include/rte_byteorder_64.h:52:20: warning: ISO C++1z does not allow 'register' storage class specifier [-Wregister]
>   register uint64_t x = _x;
>                     ^
> 
> 
> ?Just thought to let you know... that's a small issue for me since I'm using -Werror
> 
> 
> Thanks,
> Francesco
> 
> 

Why is DPDK code using register keyword at all? It is ignored by modern compilers.


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