[swift-users] clang builtins from Swift?

Jean-Denis Muys jdmuys at gmail.com
Sun Oct 2 20:24:42 CDT 2016


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?


-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.swift.org/pipermail/swift-users/attachments/20161003/9a24385a/attachment.html>

More information about the swift-users mailing list