Re: [dpdk-dev] [PATCH 1/6] eal: add portable way to check for math overflow

> +#if defined(__has_builtin) > +#if __has_builtin(__builtin_add_overflow) > +#define RTE_HAVE_BUILTIN_OVERFLOW > +#endif > +#elif defined(RTE_TOOLCHAIN_GCC) && (GCC_VERSION >= 5000) > +#define RTE__HAVE_BUILTIN_OVERFLOW Excessive underline after RTE results in RTE_HAVE_BUILTIN

[dpdk-dev] [PATCH 1/6] eal: add portable way to check for math overflow

Clang and recent versions of GCC has builtin functions to do most math operations and check for wraparound. On most architectures this is a just a math operation followed by a branch on carry set. But DPDK needs to be able to handle older GCC versions, and other compilers so a wrapper macro is nee