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cvisual-studiogccc89restrict-qualifier

What's a good way to check availability of __restrict keyword?

I am looking a set of #ifdef's to check availability of __restrict keyword for GCC and Visual Studio. I assume that it needs to check compiler version, but I don't know for which versions it was introduced. Anyone that can help me out?

UPDATE: This must (and only needs to) work when compiling as C89! So I cannot rely on __STDC_VERSION__ indicating C99, or C99 support.

Solution

  • How I fixed it:

    #if defined(__GNUC__) && ((__GNUC__ > 3) || (__GNUC__ == 3 && __GNUC_MINOR__ >= 1))
#   define SKP_restrict __restrict
#elif defined(_MSC_VER) && _MSC_VER >= 1400
#   define SKP_restrict __restrict
#else
#   define SKP_restrict
#endif