Can I add a new built-in macro __builtin_secure_generate_random(void* data, std::size_t size) for C and C++ on hosted GCC platforms that support it?

[unlvsur unlvsur via Gcc]

I think compiler time random number is useful for cryptography things like 
blinding.

This built-in should also be constexpr.

On platforms that does not support this feature (MSDOS) do not define this 
__builtin.

Users can use

#if __has_builtin(__builtin_secure_generate_random)

#endif

to detect whether this feature is supported.


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