[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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