[swift-dev] Portable stdlib

Slava Pestov spestov at apple.com
Mon Aug 14 12:54:23 CDT 2017

> On Aug 14, 2017, at 9:44 AM, Andy Best via swift-dev <swift-dev at swift.org> wrote:
> Hey,
> I'm currently looking at building a portable version of the standard library (for targeting microcontrollers, kernel dev, etc).

I’m a bit confused about your terminology. By “portable” do you mean no dependencies on libc or POSIX?

> The easiest way to cross compile Swift at the moment (that I can find) is to get swiftc to generate LLVM IR (-emit-ir), and use clang to build and cross compile. This obviously leaves the problem that there won't be a standard lib to link against on the target.

There’s a PR open to add cross-compilation support to the build system: https://github.com/apple/swift/pull/1398 <https://github.com/apple/swift/pull/1398> It would be great if you or someone else would dust it off and get it merged in.

> I figured that the best way to accomplish this would probably be to implement whatever stubs are necessary for the target (e.g. all the libc calls).
> I am struggling to find the best way to build the standard library though. I've got a copy of the stdlib files, have run gyb over all of the templates, and am attempting to get swiftc to compile everything and output a giant IR file.
> I was wondering if there was an easier way to go about building a custom libswiftcore?
> It would obviously be great to be able to use Swift in this way without an OS, as it would open up a lot of opportunities for use of the language (embedded development, etc).


> Thanks,
> Andy
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