Currently in Swift 3 release of SwiftPM, you cannot override this setting.
A proper solution to this problem is yet to be built in SwiftPM however in
the mean time this patch was landed to allow overrides by passing custom
args: https://github.com/apple/swift-package-manager/pull/715
It is available in a recent trunk snapshot from swift.org

Also, while passing custom arguments to swift build, escape each argument
with the prefix eg:
*`-Xswiftc -target x86_64-apple-macosx10.12`  **should be:** `**-Xswiftc
-target **-Xswiftc **x86_64-apple-macosx10.12`*

On Mon, Oct 17, 2016 at 5:23 AM, Edward Connell via swift-users <
swift-users@swift.org> wrote:

> Hi, I've written a Swift (with some C) framework the builds and runs
> cleanly in Xcode 8.
> A critical feature of my project is for my framework to run on MacOS, iOS,
> and Linux.
> I am trying to figure out how to build using the SPM so I can run on
> Ubuntu.
> I'm not so happy with the project structure now, but at least I think I am
> almost there.
> I've hit a sticking point that I can't seem to figure out. The SPM sets
> the target SDK to 10.10 by default.
> Features in Swift 3.0 that I am using require at least 10.11. When I type:
> *swift build -Xcc -I/usr/local/include -Xswiftc -j4 -Xlinker
> -L/usr/local/lib -Xlinker -lpng -Xlinker -ljpeg*
> The build bombs with:
> "... error: 'init(fileURLWithPath:relativeTo:)' is only available on OS X
> 10.11 or newer"
> How do I set the correct OS version??
> I looked at the Xcode settings and tried to pass them through, but there
> seems to be an argument parsing error by SPM.
> I am currently trying:
> *swift build -Xcc -I/usr/local/include -Xswiftc -j4 -Xswiftc -sdk
> /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.12.sdk
> -Xswiftc -target x86_64-apple-macosx10.12 -Xlinker -L/usr/local/lib
> -Xlinker -lpng -Xlinker -ljpeg*
> And I get:
> error: unknown command: /Applications/Xcode.app/
> Contents/Developer/Platforms/MacOSX.platform/Developer/
> SDKs/MacOSX10.12.sdk
> So it seems it thinks the parameter is a command.
> *How do you set the sdk and target versions through swift build to fix
> this problem?*
> Thanks, Ed
> *Configuration*:
> MacBook Pro (Retina, 13-inch, Early 2015)
> Sierra 10.12 (16A323)
> Xcode Version 8.0 (8A218a)
> _______________________________________________
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