[cfe-users] __builtin_constant_p(), __builtin_expect() and __builtin_types_compatible_p() and __has_builtin()

[Chris Hall via cfe-users]

I find that __builtin_constant_p() works as expected, but 
__has_builtin(constant_p) denies it !

Similarly __builtin_expect() and __builtin_types_compatible_p() !

Can I just assume these are all supported by all version of clang ?

Chris