Thanks, all. Sounds like following Clang and the interpreter is the way to go. https://github.com/apple/swift/pull/13114
Jordan > On Nov 27, 2017, at 16:44, Jordan Rose via swift-dev <swift-dev@swift.org> > wrote: > > Hi, all. Consider the following command, as run on a Mac with an up-to-date > Xcode installed: > > xcrun swiftc foo.swift > > The question: should this build for the current running OS, or the oldest > macOS Swift supports (10.9)? You can always specify the deployment target OS > version explicitly with the -target option, but what should the default > behavior be? > > Some points to consider: > - The deployment OS affects availability checks, which means that the command > might succeed on one host but fail on another. > - …but we already changed the default for the interpreter (`xcrun swift`) to > be the current running OS in Swift 3.1 (Xcode 8.3, last spring). > - Clang defaults to the current running OS (as of a few Xcodes ago, IIRC). > > Given these points, I'm inclined to change swiftc to default to building for > the current running OS when no target is specified, but what do other people > think? > > Note that this doesn't apply to projects built with either Xcode or the Swift > Package Manager, both of which always explicitly provide a deployment target. > Invoking swiftc directly and not providing -target means (1) you are > definitely compiling for Mac (when run on a Mac), and (2) there's a good > chance you don't plan to distribute what you just built, because until Swift > lives in the OS, it has dependencies on your installed Swift toolchain > (currently messily resolved with absolute rpaths). If you avoid this with > -static-stdlib, you're giving up the ability to have dynamic libraries, > because we didn't implement that properly. > > Thanks for your feedback! > Jordan > > P.S. For Apple folks, this is rdar://problem/29948658 > <rdar://problem/29948658>. > > _______________________________________________ > swift-dev mailing list > swift-dev@swift.org > https://lists.swift.org/mailman/listinfo/swift-dev
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