[swift-users] clang builtins from Swift?

[Jean-Denis Muys]

Hi,

Xcode seems to think that [some] builtins can be used from Swift. It
autocompletes popcount for example, and command-clicking the function opens
a bona fide interface file, with the following declaration (among others):

public func __builtin_popcount(_: UInt32) -> Int32

However, when I try to compile code that uses that function, I get an
unresolved identifier compiler error.

I guess I need to import some module, but which one?

Generally speaking, how to find in which module some symbol is defined?

Thanks,

Jean-Denis
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