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Compiling a C++ application that includes directly or indirectly rte_common.h will cause a warning: include/rte_common.h:350:37: warning: ISO C++17 does not allow ‘register’ storage class specifier [-Wregister] rte_combine32ms1b(register uint32_t x) C++ is pickier than standard C and flags this antique usage. The register keyword is an old K&R legacy and should be removed everywhere in DPDK. For now, fix it where it hurts. Fixes: 08f683174e94 ("eal: add functions for previous power of 2 alignment") Cc: stable@dpdk.org Signed-off-by: Stephen Hemminger <stephen@networkplumber.org> Acked-by: Bruce Richardson <bruce.richardson@intel.com>